To adjust uPVC door hinges, open the door, remove the hinge cover caps and turn the adjustment screws with an Allen key, usually a 5mm one: one screw moves the door up or down, one moves it side to side, and on many flag hinges a third pulls it tighter to the seals (compression). Work in small turns, close the door to test after each one, and adjust the keeps on the frame last. Most dropped, draughty or hard-to-lock uPVC doors can be fixed this way in under an hour.
Before you start
Check your warranty
If the door is fairly new, check whether it is still covered by a manufacturer’s or installer’s guarantee before you adjust anything. Window and door firm Everest advises checking this first, and a quick call to the installer may get it fixed for free.
Tools
- Allen (hex) key set. A 5mm key is the most common size for hinge adjustment, but other sizes are used, so a set is safest.
- Small flat-head screwdriver to pop off cover caps
- Cross-head screwdriver for cap screws and some side screws
- Spirit level
- Pencil or masking tape to mark starting positions
Step 1: Diagnose the problem
Work out what the door is doing before you turn any screws.
| Symptom | Likely cause | Adjustment |
|---|---|---|
| Bottom of the door catches the threshold on the lock side | Door has dropped | Height and lateral |
| Gap at the lock side wider at the top than the bottom | Door has dropped | Height and lateral |
| Draught at the top or bottom corner | Door sits away from the seals | Compression, then keeps |
| Handle stiff to lift, or key hard to turn, only when shut | Locking points catching on the keeps | Height or lateral, then keeps |
| Door rubs the frame on the hinge side | Door too far towards the hinges | Lateral |
| Meets the frame top and bottom but not in the middle | Door is warped | Adjustment will not fix it |
Use a spirit level along the top of the door, check that the corner joints line up with the frame, and look at the gap down the lock side. Then open the door and operate the handle and key. If everything is smooth with the door open but stiff when shut, alignment is the problem, not the lock.
Step 2: Identify your hinge type
uPVC doors use a few main hinge types, and they offer different adjustments.
Flag hinges
The most common on modern uPVC doors and the most adjustable. A flag hinge has a “flag” plate fixed into the door and a body on the frame. According to Everest and Homebuilding, the top screw usually sets height, the side screw lateral position and the bottom screw, where fitted, compression. Not every flag hinge has a compression screw, and manufacturers do not all put the screws in the same place, so watch what each one does as you turn it.
Butt hinges
Older and less adjustable. Some only allow small vertical changes via the top and bottom pins; newer versions add side screws for lateral movement. Some have no adjustment at all.
T-hinges and rebate hinges
Similar to flag hinges, usually adjustable for height and side to side, but they may not have compression adjustment.
Step 3: Adjust the hinges
Adjust all the hinges on the door by the same amount unless you are correcting a twist. Mark each screw’s starting position so you can go back if needed.
Remove the covers
On flag hinges, the adjustment screws are hidden. Open the door, take off the top and bottom caps, and remove the large hinge cover, which may be held by screws on the inside of the hinge. On butt hinges, pop the cap on top of the pin; if there is a small grub screw, loosen it before adjusting the pin.
Height (dropped door)
Turn the height screw a turn or two and close the door to check. Everest notes the height screw on typical flag hinges gives around 4.5mm of adjustment. Lift the door until it clears the threshold evenly and the gap at the top is consistent.
Lateral (side to side)
Use the side screw to move the door towards or away from the hinge side. Typical flag hinges allow around 5mm. Aim for an even gap down the lock side, and check the hinge side so the door does not rub the frame.
Compression (seals and draughts)
If the door does not press firmly against the seals, adjust the compression screw a little at a time. There is less travel here: around 2mm either way on a typical flag hinge. On the Maxim 3D flag hinge, for example, the maker’s guidance is to turn the compression adjusters in small steps and not to force them, because forcing can damage the hinge.
Test after every change
Close the door, lift the handle and lock it with the key after each adjustment. Small movements make a big difference. Take your time: it is normal to go back and forth a few times.
Refit covers and check anti-lift screws
Refit all covers and caps. Some flag hinges have an anti-lift-off screw that stops the door being lifted off its hinges; the Maxim guidance, for instance, covers re-engaging it with a smaller Allen key. If your hinge has one, make sure it is set correctly before you finish.
Step 4: Fix draughts and locking issues at the keeps
Once the door hangs square, look at the keeps, the metal plates on the frame that the latch, deadbolt and locking points engage. Many keeps are adjustable or can be repositioned slightly.
- To pull the door tighter to the seals, adjust the keeps so the locking points pull the door in further as they engage.
- If the latch rattles, adjust the latch keep so the latch sits snugly.
- If the handle is stiff to lift, check which locking point is catching. Marks on the keeps often show where hooks or rollers are rubbing.
Homebuilding’s advice is to realign the hinges first, then fine-tune the keeps, rather than the other way round.
When adjustment is not enough
- Warped door: if it meets the frame top and bottom but not in the middle, it is likely warped and will need replacing.
- Worn hinges: if you run out of adjustment, the hinges may need replacing. Use matching hinges from the original supplier where possible.
- Still will not lock: the locking mechanism or gearbox may be worn after years of strain. A locksmith can confirm.
Why alignment matters for security
A door that is hard to lock tends to get left on the latch, and a uPVC door is only properly locked when the handle is lifted and the key turned. Strain from a dropped door also wears the gearbox and locking points, which can lead to failure. Fixing the hinges protects the lock as well as your heating bill.
While you are checking the door, look at the cylinder too. West Yorkshire Police recommend a 3-star solution under TS 007 as the minimum when upgrading cylinders. Our guide to anti lock snapping explains why, and our guide to the top weak points of uPVC doors covers the rest of the door.
FAQs
What size Allen key do I need for uPVC door hinges?
A 5mm key is the most common for flag hinge adjustment, but sizes vary between makers, and some hinges use a smaller key for the anti-lift screw. A full hex key set avoids guesswork.
Which screw raises a dropped uPVC door?
On most flag hinges it is the screw at the top of the hinge body. Turn it a little, then close the door and check. You may also need a small lateral adjustment to even out the gap on the lock side.
Can I fix a draughty uPVC door without replacing the seals?
Often, yes. Use the compression adjustment on the hinges and the keeps on the frame to pull the door tighter to the seals. If the seals are flattened, split or missing, they will need replacing.
Will adjusting the hinges void my warranty?
It might, depending on the terms. Check with the installer or manufacturer first if the door is still under guarantee.
Next steps
With the door hanging straight and locking smoothly, add protection that does not rely on the lock alone. The Door Jammer – HOLDOOR hooks under the inside handle of a uPVC door and braces it against the floor, so it stays shut even if the lock is snapped, bumped or picked. It is Sold Secure Bronze rated and Secured by Design accredited, adjusts from 70cm to 120cm, and fits most UK single-handle uPVC doors in about a minute with no drilling or tools. It is not for sliding, French/double or patio doors. £90 with free UK delivery and 30-day returns.
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.
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