3 Types of uPVC Door Hinges: Identify, Adjust and Replace

by iain macLEOD | Oct 31, 2026 | Home Security

There are three main types of uPVC door hinge: flag hinges, butt hinges and T-hinges. Flag hinges are the most common on modern uPVC doors and offer the most adjustment; butt hinges are found on older doors and offer little; T-hinges sit somewhere in between. You can usually tell them apart in seconds by looking at the shape of the plates, and that tells you how to adjust them and what to buy if one needs replacing.

This guide shows you how to identify each type, how adjustment works, when to replace a hinge and what it means for your door’s security.

Why hinges matter on a uPVC door

uPVC doors are heavy, and the hinges carry all that weight. Over time hinges can loosen and the door can drop, as Homebuilding & Renovating explains. A dropped door causes familiar problems:

• The handle is stiff or won’t lift fully.
• The key is hard to turn, or the door only locks if you push or pull it.
• The door catches on the frame or drags on the threshold.
• Draughts or light around the edges.

Many of these are hinge adjustment jobs, not a broken lock. Getting the alignment right also lets the multi-point lock engage properly, which matters for security.

Quick identification guide

You may also come across rebated hinges, where the leaf sits against the door sash so the hinge is largely hidden when the door is closed. Homebuilding notes these typically adjust laterally and vertically.

Tip: before you do anything, take clear photos of the hinge with the door open and closed, and look for any brand name stamped on the plates or caps. That will save time if you need a replacement.

1. Flag hinges

How to spot one

Open the door and look at the frame. A flag hinge has one plate screwed to the frame with a cylindrical knuckle, and that knuckle connects to the door, so the plate sticks out like a flag on a pole. There are usually plastic caps covering the adjustment screws, and a larger cover over the hinge body.

How adjustment works

Flag hinges give you the most control, according to Homebuilding. Remove the caps and you’ll typically find three adjustments:

• Height (vertical): a screw at the top of the hinge raises or lowers the door. Homebuilding says this gives around 4mm of movement.
• Side-to-side (lateral): a horizontal screw moves the door towards or away from the hinge side, typically up to about 5mm.
• Compression: on many models, a screw at the bottom pulls the door tighter into the frame seals or lets it out.

These are usually turned with an Allen (hex) key. The exact key size and which way each screw turns vary between makes, so check the maker’s instructions if you can find them.

Adjusting a dropped door step by step

1. Open the door and look at where it’s catching or where the gap is uneven.
2. Remove the caps on each hinge to reach the screws.
3. Make a small adjustment, such as a quarter or half turn, on each hinge in turn so they share the load.
4. Close the door and try the handle and key after every small change.
5. When the door closes and locks smoothly, refit the caps.

Screwfix also suggests checking the latch lines up with the strike plate and using the compression adjustment to help with draughts.

2. Butt hinges

How to spot one

A butt hinge has two leaves, one on the door and one on the frame, joined by a pin. On older uPVC doors they are often cylinder or “pencil” style hinges. When the door is closed you’ll typically see the barrel of the hinge between door and frame.

Adjustment

Older butt hinges offer little or no adjustment. Homebuilding explains that on some, you can loosen a grub screw on the top and bottom pins and make a small vertical adjustment with an Allen key, and some newer butt hinges have side screws for side-to-side movement. Make small changes and re-check the gaps each time.

If a butt hinge has no adjustment left and the door still drops, look at whether the screws are loose or stripped before assuming the hinge itself has failed.

3. T-hinges

How to spot one

A T-hinge is shaped like the letter T: a longer plate on the door and a shorter one on the frame. Screwfix notes they’re often used on heavier doors.

Adjustment

T-hinges usually allow height and side-to-side adjustment only. Find the adjustment screw, loosen it slightly, reposition the door, then retighten and check that the gaps are even all round.

When to replace a hinge rather than adjust it

Consider replacement if:

• There’s no adjustment left and the door still drops or catches.
• The hinge is cracked, bent or the knuckle is worn and the door rocks.
• Screws won’t hold because the fixing holes have stripped.
• The hinge is so stiff or corroded it’s straining the door.

Matching a replacement is the hard part. Hinges vary by brand, door system and the depth of the frame, so take your photos and measurements to a door hardware supplier or a uPVC door specialist. Lifting a heavy uPVC door off its hinges is a two-person job. If the door is still under warranty, check with the installer before you change anything. Homebuilding points out that if adjusting doesn’t help, the answer may be new hinges or, for a badly warped door, a new door.

Hinges and security

The hinge side of a door gets less attention than the lock, but it matters, especially where the hinges are on the outside.

• Outward-opening doors: West Yorkshire Police suggest hinge bolts or security hinges to reinforce the hinge side, and hinge protectors or bolts on each hinge of French doors.
• Alignment: a door that has dropped may stop the multi-point lock engaging fully. If you have to force the handle, fix the hinges.
• Screws: make sure all hinge screws are present and tight.

For a wider look at where uPVC doors are vulnerable, see our guide to the top weak points of uPVC doors, or our guide are uPVC doors secure?

Extra protection while you’re home

Once your door is properly aligned and locking smoothly, you can add a layer that doesn’t depend on the lock. The Door Jammer – HOLDOOR hooks under the inside handle of a uPVC door and braces it against the floor, so the door stays shut even if the lock is snapped, bumped or picked. It’s Sold Secure Bronze rated and Secured by Design accredited (Police Preferred Specification), adjusts from 70cm to 120cm, and fits most UK single-handle uPVC doors with the handle on the left or right. It needs no drilling and no tools, so nothing is screwed into your door or frame. It’s used from inside when someone is at home, and isn’t for sliding, French, double or patio doors.

In a fire: find the key, lift the Door Jammer off (or unlock and remove the Door Handle Guard), unlock the door and leave the building.

Frequently asked questions

What type of hinge is on most uPVC doors?

Flag hinges are the most common on modern uPVC doors. Older doors may have butt or T-hinges.

How many hinges should a uPVC door have?

Most uPVC front and back doors have three or four. Whatever yours has, adjust each one a little at a time so they share the load evenly.

Why won’t my uPVC door lock after adjusting the hinges?

If hinge adjustment hasn’t fixed it, check the keeps on the frame. If it still won’t lock, Homebuilding’s advice is that it’s rarely a simple fix and may need a professional.

Can I replace uPVC door hinges myself?

If you can identify an exact match, yes, with a helper to take the door’s weight. If you can’t identify the hinge, get advice from a specialist first.

Next steps

1. Open your door and identify the hinge type using the table above.
2. Photograph the hinges and note any brand markings.
3. Make small adjustments, testing the handle and key each time.
4. Once the door locks smoothly, add the Door Jammer – HOLDOOR for extra protection at night.

Police.uk Crime Map: How to Check Crime by Postcode (and Read It Properly)

by iain macLEOD | Oct 31, 2026 | Home Security

The police.uk crime map shows recorded crime and anti-social behaviour near any postcode in England, Wales and Northern Ireland. You enter a postcode, pick your area, and see a map of approximate crime locations plus a summary of the most commonly reported crimes. It’s free and comes from police forces’ own data, but locations are deliberately approximate and some data is missing, so it’s best used to spot patterns rather than judge a single street.

Here’s how to use it step by step, how to read what you see, and the limitations worth knowing before you draw conclusions.

What the police.uk crime map covers

• Who supplies the data: according to data.police.uk, crime and anti-social behaviour data comes from the 43 geographic police forces in England and Wales, the British Transport Police and the Police Service of Northern Ireland, with court results from the Ministry of Justice.
• How often it updates: monthly. Each upload is a snapshot of what forces held at the end of that month.
• What it doesn’t cover: Scotland. Police Scotland doesn’t supply data, so for Scottish locations only British Transport Police crime appears, which data.police.uk warns can make crime look much lower than it really is.

How to use the police.uk crime map, step by step

Step 1: Go to police.uk and search your postcode

Go to the official site at police.uk and use the search box to look up your local area. You can enter a full postcode for the most precise result.

Step 2: Pick the right area

If more than one result appears, choose the street or neighbourhood you want. You’ll be taken to the page for that neighbourhood, which also shows your local policing team and how to contact them.

Step 3: Open the crime map

On the neighbourhood page, look for the section on crime. Neighbourhood pages on police force websites group this under “Crimes and priorities”, with tabs for “Top reported crimes in this area”, “Crime map” and “Our priorities”. Select the crime map.

Step 4: Explore the map

The map shows crime as hotspots. Zoom in and move around to see your own streets and the surrounding area. Keep in mind that, in the map’s own words, “the hotspots give only a loose idea of where crimes happened”.

Step 5: Check the top reported crimes

The “Top reported crimes in this area” tab lists the most common categories for a recent month with a count for each. It’s a quick way to see whether, say, burglary or vehicle crime is a local issue.

Step 6: Read “About this crime map”

Underneath the map there’s a short note, including how many incidents in the force area couldn’t be mapped to a location and so don’t appear at all. It’s worth reading every time.

Understanding the crime categories

Crimes are grouped into broad categories. Police.uk lists them as:

These categories are broad. Police.uk points out that the violent crime category covers everything from common assault to murder, so a high number doesn’t tell you how serious the incidents were.

How to read the map properly

Locations are approximate on purpose

To protect victims’ privacy, crimes aren’t shown at their exact address. data.police.uk explains that each crime is moved to the nearest of a set of anonymous map points, and each point must cover at least eight postal addresses or none at all. That’s why you often see clusters on a street centre, a park or a car park. A dot outside a house doesn’t mean the crime happened there.

Not every crime appears

Police.uk says some incidents are left off the map, such as crimes where the location isn’t known, or where anonymising would place them more than 20km from where they happened. Crimes on moving trains are attributed to the end destination of the journey.

Outcomes are incomplete

Where available, the site shows what happened next, such as whether a case went to court. But outcomes for anti-social behaviour aren’t available, some court outcomes can’t yet be matched, and only the most punitive court outcome is shown. data.police.uk says the success rate for matching crimes to court results ranges from 19% to 97% depending on the area.

Some forces have gaps

Forces sometimes miss a month or refresh earlier data, and these are logged on the data.police.uk changelog. At the time of writing (October 2026), the changelog lists Greater Manchester Police as having no crime, outcome or stop and search data currently available, so the map won’t give a useful picture for Manchester, Salford and the rest of Greater Manchester. See the Greater Manchester section below for the older records you can still use.

Compare like with like

A busy town centre with shops, pubs and a station will almost always show more crime than a quiet residential street, simply because more people pass through. Compare similar areas over several months rather than reacting to a single month.

Greater Manchester: older records only

If you live in Greater Manchester, the police.uk street map can’t help you at the moment. The data.police.uk changelog records Greater Manchester Police crime data as “not provided” for every month from March 2025 to August 2026, and its known-issues list says no GMP crime, outcome or stop and search data is currently available. GMP has said its records management system has been unable to align with the national police.uk data return.

Until that changes, these are the best sources, and they are older records, so treat them as a guide rather than today’s picture:

• Force-wide totals (older): ONS police recorded crime figures show Greater Manchester Police recorded 319,131 crimes in the year ending March 2025, down 7% from 342,159 the year before (ONS Police Force Area data tables). These are force-wide figures, not street level, and they are the latest full-year GMP totals we could find. Note that the ONS has since excluded GMP from some trend comparisons because of the force’s data supply problems.
• GMP’s own figures: the GMP Stats and data page publishes some crime statistics and a neighbourhood crime section directly.
• Your neighbourhood team: your local GMP neighbourhood team page and Neighbourhood Watch alerts are often the quickest way to hear about burglaries near you.

Whatever the figures say, the basics don’t change: an anti-snap cylinder on every external door and a physical barrier on the back door at night protect you whether or not your area’s data is published.

Other ways to check crime near you

• Download the data: data.police.uk offers the raw data for analysis, and its street-level crime API returns crimes within a one-mile radius of a point or a custom area.
• Your force’s website: many forces show the same neighbourhood crime map, local priorities and team contacts on their own sites.
• Your neighbourhood policing team: they can tell you about local issues and give crime prevention advice. Many run local meetings.
• Neighbourhood Watch: a good way to hear what’s happening on your street.

To report a crime, call 999 in an emergency or 101 if it’s not urgent, or report online through your force’s website. To report information anonymously, contact Crimestoppers.

Turning what you find into action

If the map shows burglary is a local issue, it’s a prompt to review your own home rather than a reason to panic. Our guide on how to secure your home covers the essentials, and our look at the top weak points of uPVC doors shows where to start on the door itself.

For a single uPVC front or back door, the Door Jammer – HOLDOOR hooks under the inside handle and braces the door against the floor, so it stays shut even if the lock is snapped, bumped or picked. It’s Sold Secure Bronze rated and Secured by Design accredited (Police Preferred Specification), needs no drilling or tools, and fits most UK single-handle uPVC doors. It’s used from inside when someone is home, and isn’t for sliding, French, double or patio doors.

In a fire: find the key, lift the Door Jammer off (or unlock and remove the Door Handle Guard), unlock the door and leave the building.

Frequently asked questions

Is the police.uk crime map accurate?

It’s official police data, but locations are deliberately approximate and some crimes can’t be mapped. It’s reliable for patterns across an area, not for the exact location of a single crime.

How often is the crime map updated?

Monthly. Each month’s data is a snapshot, and forces sometimes refresh earlier months or miss a month.

Why can’t I see crime data for Greater Manchester?

At the time of writing (October 2026), the data.police.uk changelog says no Greater Manchester Police crime data is currently available; GMP data has been missing since March 2025. Use the older ONS force-wide figures and GMP’s own Stats and data page instead, and check the changelog for updates.

Does it cover Scotland?

No. Only British Transport Police data appears for Scottish locations, so crime will look much lower than it really is.

Can I see crime on my exact street?

You can zoom to your street, but crimes are placed on anonymous map points that each cover at least eight addresses, so you can’t tell which property was involved.

Next steps

1. Search your postcode on police.uk and open the crime map.
2. Check the top reported crimes and the “About this crime map” note.
3. Look at the data.police.uk changelog for any gaps in your force’s data.
4. If burglary is a local concern, review your doors and consider the Door Jammer – HOLDOOR for your uPVC door.

Home Security Devices UK: 15 Types Compared for Every Budget

by iain macLEOD | Oct 31, 2026 | Home Security

Good security for your home starts with the doors and windows, then adds devices that warn you, deter burglars or record what happens. You do not need everything on this list: most UK homes are well covered by strong locks, one or two physical door devices, a sensible alarm and decent lighting. Below are 15 home security devices, grouped from physical protection to electronics, with what each one actually does, who it suits and what it costs to run.

Police crime prevention advice is clear on the order of work. Avon and Somerset Police put it simply: “Sort out your physical security first and put the alarm in afterwards.” So that is where this list starts.

Quick comparison: 15 home security devices

Prices vary a lot between brands and retailers, so the table uses rough budget levels rather than figures. Always check what ongoing subscriptions a device needs before you buy.

Physical door and window security

Most break-ins involve getting through a door or window, so this is where your money goes furthest. If you are not sure where your door is weakest, read our guide to the top weak points of uPVC doors.

1. Door security bar or jammer

A door security bar braces the door against the floor from the inside, so it stays shut even if the lock itself is attacked. It is used while you are at home, typically on the back door overnight or on the front door once everyone is in.

The Door Jammer – HOLDOOR hooks under the inside handle of a uPVC door and braces it against the floor, so the door stays shut even if the lock is snapped, bumped or picked. It is Sold Secure Bronze rated and Secured by Design accredited (Police Preferred Specification), adjusts from 70cm to 120cm and fits most UK single-handle uPVC doors with the handle on the left or right. There is no drilling and no tools; it fits in about a minute and comes with a wall mount. It is not suitable for sliding, French/double or patio doors.

2. Door handle guard

Some attacks on uPVC doors target the handle rather than the lock, for example reaching the inside lever through a letterbox or a broken pane. A handle guard covers the inside lever so it cannot be pressed down. The Door Handle Guard – HOLDOOR is a lockable steel cover that drops over the inside lever handle of a single uPVC door, locates in a Secure Keeper screwed to the frame and is locked with a Secure Peg that takes a small padlock. It is currently on pre-order and is being submitted for independent testing, so it has no rating yet. Like the Door Jammer, it is not for patio, French or double doors.

In a fire: find the key, lift the Door Jammer off (or unlock and remove the Door Handle Guard), unlock the door and leave the building.

3. Anti-snap euro cylinder

Many uPVC and composite doors use a euro cylinder, and a weak one can be the easiest way in. West Yorkshire Police explain that cylinders are tested to TS 007 (1 or 3 stars) and the Sold Secure Diamond Standard (SS312), and recommend a 3-star solution as the minimum when upgrading. A 3-star cylinder on its own meets that, as does a 1-star cylinder paired with a 2-star security handle. Our guide to anti lock snapping explains the options in more detail.

4. Security handles and spindle

Handles matter as well as the cylinder. TS 007 2-star handles are built to protect the cylinder from attack. Inside the door, the spindle connects the two handles. The Security Spindle – HOLDOOR is an 8mm boxed steel spindle, 138mm long and trimmed to fit, with an anti-tamper security clip that resists handle manipulation.

5. Window locks and restrictors

Key-operated window handles, restrictors and secondary locks stop ground-floor and easily reached windows from being opened from outside. Check that any restrictor can be released quickly from inside, because windows can be escape routes in a fire.

6. Smart lock

Smart locks let you unlock with an app, code or fob and show a log of who came and went. Retrofit types fit over the inside thumb-turn; others replace the cylinder or whole lock. Before buying, check compatibility with your door and lock, and check that the cylinder it uses carries a recognised rating such as TS 007 3-star. Convenience is not the same as strength, so a smart lock should never mean a weaker cylinder.

Alarms and sensors

7. DIY wireless alarm

A wireless kit usually includes a hub, door and window contacts, motion sensors and a siren, with alerts sent to your phone. They are quick to fit and you can take them with you when you move, which suits renters. Many kits let you add sensors to garages and sheds. Remember that an unmonitored alarm depends on you or your neighbours reacting. Avon and Somerset Police note that police are less likely to respond to an unmonitored alarm, and advise not to programme 999 into an auto-dialler.

8. Professionally monitored alarm

A monitored system sends signals to an Alarm Receiving Centre, which checks the alert and contacts keyholders or, where the system qualifies, the police. Crimestoppers explains that police attend a monitored signal only if the system complies with the National Police Chiefs’ Council Security Systems Requirements; otherwise the keyholder is informed. Use an installer approved by one of the two inspectorates, NSI or SSAIB, and read the contract length and cancellation terms carefully. Our guide on how to secure your home covers how alarms fit into a wider plan.

Cameras and doorbells

9. Video doorbell

A video doorbell lets you see and talk to callers without opening the door, which is useful against doorstep scams. Battery models suit flats and rentals; wired models avoid recharging. Many need a subscription to save recordings, so check before buying.

10. Indoor cameras

Indoor cameras are cheap, easy to place and useful for checking the house when you are away. Use the privacy settings to switch them off or cover the lens while you are home.

11. Outdoor CCTV

Outdoor cameras deter and record around the drive, garden and back of the house. If your camera or doorbell records beyond your property boundary, the Information Commissioner’s Office says data protection law applies: position cameras to cover your own property where possible, put up a sign saying CCTV is in use, delete footage regularly and be ready to give people a copy of footage they appear in.

Deterrents and everyday protection

12. Security lighting

Good lighting removes the dark corners burglars rely on. Avon and Somerset Police suggest considering dusk-till-dawn lighting, which gives a constant low white light, because motion-sensor lights can be set off by animals and visitors. Keep plants trimmed so they do not block lights, and angle them so they do not annoy neighbours.

13. Timers and smart plugs

Timer switches and smart plugs turn lamps or a radio on and off so the house looks lived in while you are out. Use varied or random schedules rather than the same time every night.

14. Home safe

A safe protects passports, documents, jewellery and spare keys. Bolt it down where possible and keep it out of obvious places. If you want valuables covered by insurance while they are in the safe, ask your insurer what rating it requires before you buy.

15. Smoke and carbon monoxide alarms

They are not anti-burglar devices, but no home safety plan is complete without them. In England, landlords must fit at least one smoke alarm on each storey with living accommodation, and a carbon monoxide alarm in any living room with a fixed combustion appliance (excluding gas cookers). Homeowners should follow the same sensible standard and test alarms regularly.

How to choose for your budget

1. Tight budget: upgrade the cylinder to a 3-star solution, add a door security bar for nights, fit window locks, and use timers and lighting.
2. Mid budget: add a DIY wireless alarm with sensors on the main doors and a video doorbell.
3. Larger budget: consider a professionally installed, monitored alarm from an NSI or SSAIB approved company, plus outdoor CCTV set up with the ICO guidance in mind.

Whatever your budget, fit the physical protection first. Electronics tell you something has happened; locks and door devices help stop it happening.

FAQs

What is the most important security device for a home?

Strong doors and locks. A good-quality cylinder and a properly locked multi-point lock do more than any gadget. After that, an alarm and a device that physically holds the door shut when you are home add the most protection.

Are DIY alarms worth it?

They can be, especially for renters and smaller homes, as long as you understand that someone has to respond to the alert. If you want police response, you need a compliant monitored system from an approved installer.

Do I need permission to fit a video doorbell or CCTV?

On your own house you usually do not, though flats, rented homes and listed buildings may need landlord, management or council approval, so check first. If it records beyond your boundary, follow the ICO’s domestic CCTV rules.

Can I use a door security bar on any door?

Not every bar suits every door. The HOLDOOR Door Jammer is designed for single-handle uPVC doors. For sliding patio doors, a bar designed for the track is a better fit. See our FAQs for more.

Next steps

Start with the door you use least, often the back door, because it is usually out of sight. Check the cylinder rating, make sure you lift the handle and lock it with the key every time, and add a device that holds the door shut overnight. The Door Jammer – HOLDOOR is made in Britain from British steel, costs £90 with free UK delivery, and comes with 30-day returns and a 2-year warranty. It fits in about a minute with no drilling, so you can have the back door covered tonight.

Extra Front Door Security: 6 Upgrades That Really Work (UK)

by iain macLEOD | Oct 31, 2026 | Home Security

The extra front door security that makes the biggest difference in a UK home is usually simple: a properly rated anti-snap cylinder, a door brace or frame reinforcement suited to your door, protection for the hinge side and letterbox, and a way to see who’s there before you open up. None of it needs to be expensive or complicated, but it does need to match the door you actually have.

Here are six upgrades that genuinely help, what each one protects against and which doors they suit.

Start with the basics

Before adding anything, make sure you’re getting the most from what you have:

• Lock it properly. On a uPVC or composite door, lift the handle and turn the key every time. Otherwise only the latch may be holding the door.
• Keep keys out of reach. Don’t leave keys in the lock or on a hook visible or reachable from the letterbox.
• Check alignment. If you have to force the handle or key, the door has probably dropped, and the locking points may not be engaging fully.

Our guide on how to secure a front door covers these basics in more detail.

1. An anti-snap euro cylinder (TS 007 3-star or Sold Secure Diamond)

Protects against: lock snapping and other attacks on the cylinder.

Suits: uPVC and composite doors with a euro cylinder.

On most uPVC and composite front doors, the euro cylinder is the obvious target. Older and basic cylinders can be vulnerable to lock snapping. West Yorkshire Police say a 3-star solution is the minimum to aim for when upgrading. That can be a TS 007 3-star cylinder on its own, or a 1-star cylinder with 2-star security handles. They also recognise cylinders tested to the Sold Secure Diamond standard (SS312).

What to check:

• The kitemark and star rating on the cylinder face, or the Sold Secure Diamond mark.
• The right length for your door. Police advice is that the cylinder must not stick out from the door or handle.
• If you’re not confident measuring and fitting it, use a Master Locksmiths Association approved locksmith.

2. A floor-braced door bar for uPVC doors

Protects against: the door being forced open even if the lock is defeated.

Suits: single, inward-opening uPVC doors, while you’re at home.

A good cylinder makes the lock harder to beat. A floor-braced bar adds a layer that doesn’t rely on the lock at all. The Door Jammer – HOLDOOR hooks under the inside handle and braces the door against the floor, so the door stays shut even if the lock is snapped, bumped or picked.

• Sold Secure Bronze rated and Secured by Design accredited (Police Preferred Specification)
• Adjusts from 70cm to 120cm; fits most UK single-handle uPVC doors, handle on the left or right
• No drilling, no tools, fits in about a minute, purely mechanical
• Made in Britain from British steel; £90 with free UK delivery, 30-day returns and a 2-year warranty

Because it’s fitted from inside, it’s designed for when someone is home, such as overnight. It isn’t for sliding, French, double or patio doors.

In a fire: find the key, lift the Door Jammer off (or unlock and remove the Door Handle Guard), unlock the door and leave the building.

3. Frame reinforcement for timber doors (London and Birmingham bars)

Protects against: the frame splitting when a timber door is kicked or forced.

Suits: timber doors and frames.

On a wooden front door, the weak point is often the frame around the lock rather than the lock itself. The Metropolitan Police recommend door bars such as a London bar or Birmingham bar to reinforce the door frame and resist forced entry and kicking. A London bar is a steel strip fitted along the lock side of the frame; a Birmingham bar reinforces the frame around the lock keep.

Pair frame reinforcement with a good lock. For wooden doors, West Yorkshire Police recommend a 5-lever mortice lock tested to BS 3621, which they note insurers often require.

4. Hinge bolts and sash jammers

Protects against: attacks on the hinge side and levering at the opening edge.

Suits: hinge bolts for outward-opening and timber doors; sash jammers for uPVC doors.

If your front door opens outwards, the hinges are on the outside. West Yorkshire Police suggest fitting hinge bolts or security hinges to reinforce the hinge side of outward-opening doors. Hinge bolts are steel pins in the door edge that locate in the frame when the door is shut.

A sash jammer is a small lever screwed to the frame that swings across the door’s opening edge. It’s an inexpensive extra for uPVC doors, but because it’s screwed into the profile, police advice is to check your door’s warranty first.

5. A TS 008 letterbox guard

Protects against: someone reaching or “fishing” through the letterbox for keys, or for the handle inside.

Suits: any front door with a letterbox.

Letterbox fishing uses a tool pushed through the letter plate to hook keys or work the inside handle. West Yorkshire Police advise fitting a security deflector made to TS008 on the inside of your letterbox. TS 008 is a Door & Hardware Federation specification for letter plates; the current version is TS 008:2022, which strengthened the test for resistance to key fishing.

If you’d rather stop the inside handle being pressed down at all, the Door Handle Guard – HOLDOOR is a lockable steel cover that drops over the inside lever handle of a single uPVC door and locates in a keeper screwed to the frame. It’s on pre-order and is being submitted for independent testing, so it doesn’t have a rating yet.

6. A door viewer, chain or video doorbell

Protects against: opening the door to the wrong person.

Suits: any front door.

Many incidents start with someone simply opening the door. West Yorkshire Police suggest fitting a door viewer so you can identify callers before opening the door, if you don’t have a suitable window. They also make an important point: door chains can be used to talk to callers but will not help secure a locked door against burglary.

A video doorbell does a similar job and lets you see and speak to callers when you’re not in. Think about where the camera points, keep it focused on your own property, and secure the app account with a strong password.

Which upgrades suit your door?

Replacing the whole door? Police advice is to buy a complete doorset certified to PAS 24 rather than a door on its own.

Frequently asked questions

What’s the single best upgrade for a uPVC front door?

For most people, checking the euro cylinder comes first. If it isn’t 3-star or Diamond rated, upgrade it. Then consider a door bar for when you’re home.

Does a door chain stop burglars?

No. Police advice is that chains help you talk to callers but won’t secure a locked door against burglary.

I rent. What can I add without drilling?

A freestanding floor-braced door bar needs no drilling. Anything screwed to the door or frame, such as sash jammers, needs your landlord’s agreement. See our renter’s guide to securing your door without drilling.

Do I need all six?

No. Pick the ones that fit your door and how you use it. A rated cylinder plus one layer of physical reinforcement is a strong start.

Next steps

1. Check your cylinder for a TS 007 3-star or Sold Secure Diamond mark.
2. Look at your letterbox and fit a TS 008 guard if it has none.
3. Choose reinforcement that suits your door: frame bars for timber, a floor brace for uPVC.
4. For a single uPVC front or back door, see the Door Jammer – HOLDOOR.

Want the hard numbers? The Dark Side has the latest official burglary figures for England, Wales and Greater Manchester, checked every quarter.

High Security Door Locks UK: 7 Types Worth Fitting (2026 Guide)

by iain macLEOD | Oct 31, 2026 | Home Security

The best high security door lock depends on your door. On a uPVC or composite door, that means a euro cylinder rated TS 007 3-star or Sold Secure SS312 Diamond, fitted at the right length. On a solid timber door, it means a BS 3621 mortice deadlock, usually paired with a British Standard nightlatch. Get those basics right first, then add extra layers where your door is weakest.

This guide covers the seven lock types worth knowing about in the UK, what each rating actually means, and how to pick the right one without paying for features you don’t need.

Quick guide: which lock suits which door?

If you’re not sure what you’ve got, open the door and look at the edge. A long metal strip with several bolts or hooks is a multipoint lock. A single rectangular faceplate on a wooden door is usually a mortice lock.

Understanding the ratings

Lock packaging is full of claims such as “anti-snap” or “high security”. The marks below are the ones that mean the product has been independently tested.

TS 007 (the star system)

TS 007 is a Kitemark scheme that grades cylinders and door handles with stars. A 3-star cylinder gives the full rating on its own. You can also reach 3 stars by combining a 1-star cylinder with a 2-star security handle. West Yorkshire Police say a 3-star solution is the minimum to aim for when you upgrade.

Sold Secure SS312 Diamond

SS312 is a Sold Secure test for lock cylinders. According to the Master Locksmiths Association, Diamond is the highest grade a cylinder can achieve and is treated as equivalent to a Kitemarked 3-star cylinder. Some cylinders carry both TS 007 3-star and SS312 Diamond.

BS 3621, BS 8621 and BS 10621

These British Standards cover thief-resistant locks, mostly on timber doors. The MLA explains the difference:

• BS 3621: needs a key to open from both sides.
• BS 8621: opens from inside without a key, usually with a thumbturn, so nobody can be locked in.
• BS 10621: a dual-mode lock that combines both functions. It should not be used where the door is the only way out.

Some insurers require locks to BS 3621, but policies vary, so check your own policy wording.

The 7 high security door lock types worth fitting

1. A 3-star anti-snap euro cylinder

The euro cylinder is the part you put your key into on most uPVC and composite doors. Standard cylinders can be attacked by lock snapping, so replacing a basic cylinder with a 3-star or Diamond-rated one is often the best-value upgrade you can make.

Two real examples whose ratings we checked:

• Ultion 3 Star Plus: described on the Ultion website as a 3-star, Police Preferred Specification lock.
• Avocet ABS: a stockist’s product page lists TS 007 3-star Kitemark and Sold Secure Diamond (SS312) certification, but notes that 30mm sizes don’t carry the TS 007 Kitemark.

Other brands make rated cylinders too. Whichever you choose, check that the rating mark is on the cylinder itself and applies to the size you’re buying.

2. A security handle (and a better spindle)

Under TS 007, a 2-star security handle paired with a 1-star cylinder also gives a 3-star result. Security handles shield the cylinder face, which helps where the cylinder would otherwise be exposed.

While you’re changing handles, look at the spindle, the square bar that connects the inside and outside handles. The Security Spindle – HOLDOOR is an 8mm boxed steel spindle, 138mm long and trimmed to fit, with an anti-tamper security clip that resists handle manipulation.

3. A working multipoint lock

Most uPVC and composite doors use a multipoint lock: one key turn throws hooks or bolts into the frame at several points. It only works if you use it properly. Avon and Somerset Police advise always double-locking a uPVC door by lifting the handle, then turning and removing the key.

If the handle is stiff or the key is hard to turn, the door may need adjusting or the gearbox may be worn. Get that fixed rather than leaving the door on the latch. Our guide to weak points of uPVC doors covers what to check.

4. A BS 3621 5-lever mortice deadlock

For solid timber front and back doors, a 5-lever mortice deadlock to BS 3621 is the traditional choice. It sits inside the door edge and throws a deadbolt into a keep on the frame. Look for the Kitemark and “BS 3621” stamped on the faceplate.

Fitting a mortice lock means cutting into the door, so accuracy matters. A poorly cut pocket can weaken the door. Unless you’re confident with woodwork, use a locksmith.

5. A British Standard nightlatch

A rim nightlatch is the surface-mounted lock found on many timber front doors. It latches automatically when the door closes, so it’s convenient but should not be your only lock. Choose one marked BS 3621 if insurance requires it, or BS 8621 if you want to be able to get out quickly without a key. A common set-up is a nightlatch plus a mortice deadlock below it.

6. A restricted key system

With a restricted key system, keys can usually only be cut by authorised dealers, often with proof of ownership. That makes it harder for someone to copy a key without you knowing. These systems tend to cost more, and the key control only works if you keep the paperwork that comes with the lock. If you’ve just moved house or don’t know how many keys are in circulation, replacing the cylinder is the simple fix.

7. A smart lock with a rated mechanical cylinder

Smart locks add keyless entry and activity logs. Physical security still matters most, though. Many smart locks work with or replace a euro cylinder, so check that the cylinder part carries a TS 007 3-star or SS312 Diamond rating, and keep a working key override in case batteries or connectivity fail.

Fitting tips that make a real difference

• Measure carefully. Euro cylinders are sized from the central fixing screw to each end. West Yorkshire Police stress that cylinders must be measured properly and should not be left protruding from the door or handle.
• Test with the door open. Lock and unlock a few times before you close the door.
• Use a qualified locksmith if unsure. The police recommend an MLA-approved locksmith for correct fitting.
• Keep receipts and certificates. They help if your insurer asks what locks you have.

Adding a layer behind the lock

Even a good lock is one line of defence. On a single uPVC back door, a device that holds the handle or door in place adds a second layer that doesn’t depend on the cylinder at all.

• Door Jammer – HOLDOOR: hooks under the inside handle of a uPVC door and braces it against the floor, so the door stays shut even if the lock is snapped, bumped or picked. It is Sold Secure Bronze rated and Secured by Design accredited (Police Preferred Specification). It adjusts from 70cm to 120cm, fits most UK single-handle uPVC doors with the handle on the left or right, and needs no drilling or tools. It’s used when you’re at home, because it’s fitted from inside.
• Door Handle Guard – HOLDOOR: a lockable steel cover that drops over the inside lever handle of a single uPVC door and locates in a Secure Keeper screwed to the frame, so the handle can’t be pressed down. It’s currently on pre-order and is being submitted for independent testing, so it has no rating yet.

Neither product is for sliding, French, double or patio doors.

In a fire: find the key, lift the Door Jammer off (or unlock and remove the Door Handle Guard), unlock the door and leave the building.

FAQs

What is the most secure lock for a uPVC door?

A euro cylinder rated TS 007 3-star or Sold Secure SS312 Diamond, sized so it doesn’t stick out, operating a properly adjusted multipoint lock that you lift and lock every time.

Is TS 007 3-star the same as SS312 Diamond?

They are different tests run by different schemes, but both are recognised as top-level cylinder ratings and the MLA treats Diamond as equivalent to a 3-star Kitemarked cylinder.

Do insurers require BS 3621 locks?

Some do, particularly for timber doors. Requirements vary between policies, so check your documents or ask your insurer before you buy.

Can I fit a new euro cylinder myself?

Yes, many people do. Measure carefully, buy the correct size and test it with the door open. If you’re unsure, a locksmith can supply and fit one. See our FAQs for more on uPVC door security.

Next steps

1. Check what lock and cylinder your door has now, and look for a rating mark.
2. If it’s an unmarked euro cylinder, replace it with a 3-star or Diamond-rated one at the right length.
3. Make a habit of lifting the handle and turning the key every time.
4. For a single uPVC back door, add a second layer with the Door Jammer – HOLDOOR, which is made in Britain from British steel and costs £90 with free UK delivery, 30-day returns and a 2-year warranty.