To adjust a uPVC door’s height, use the vertical adjustment screw on the hinges to raise or lower the door sash. The process usually takes only a few minutes and requires a 4mm or 5mm Allen key.
Our hinge guide explains the other adjustments found on common uPVC door hinges.
Has the Door Actually Dropped?
A dropped door usually rubs at the lower corner opposite the hinges. The gap above the door may look wider near the handle side. The latch can also sit slightly below its keep.
One quick check is to close the door slowly while watching the edges. If a gentle lift on the handle allows it to shut cleanly, the door has probably sagged.
A thin line of chalk on the rubbing edge can show the exact contact point. After one careful close, the mark transfers to the frame. That saves guesswork and keeps the adjustment focused.
The scrape may have another cause. A stone beneath the threshold, a loose hinge screw or a swollen seal can feel much the same. Those should be checked before any adjustment starts.
Which Hinge Controls the Height?
Modern uPVC doors often use flag hinges hidden beneath plastic covers. These can usually move the door vertically, sideways and closer to the seal. Butt hinges look slimmer. Some offer less adjustment.
No less, there is the fact of how the height screw may sit at the top or bottom of the hinge depending on the design. That small difference matters. Turning the wrong screw can pull the door sideways or make the seal too tight. Competitor guides from Screwfix and Everest both advise identifying the hinge type before moving it.
What Tools Are Usually Needed?
Most jobs need a metric Allen key set, a screwdriver and a spirit level. A pencil can mark the starting position. A folded cloth under the hinge catches loose caps before they disappear behind a cabinet.
A 4 mm or 5 mm Allen key is common, though the correct size varies. It should fit snugly. A worn key can round the socket and leave the adjustment screw difficult to move.
The door should stay on its hinges. Removing pins or frame screws while a glazed door is hanging creates a much larger problem.
How Is the Door Raised Safely?
A uPVC door is raised safely by supporting the door weight first and then adjusting the vertical hinge screws gradually. The goal is to lift the door sash without putting excessive pressure on the hinges, locking mechanism, or frame.
Process to Raise a uPVC Door Safely
1. Open and support the door
Open the door fully to access the hinges. Place a door wedge, lifting tool, or solid support under the door edge to take some of the weight.
A uPVC door with a double-glazed panel can weigh 50kg or more, so lifting it only through the adjustment screws can place unnecessary strain on the hinge threads.
2. Remove the hinge covers
Remove the plastic covers from the hinges to expose the vertical adjustment screw.
Depending on the hinge design:
- Flag hinges: Access the height screw from the bottom of the hinge.
- Butt hinges: Access the adjustment point through the hinge barrel.
3. Turn the vertical adjustment screws evenly
Insert the correct Allen key into the height adjustment screw.
- Turn clockwise to raise the door
- Turn anti-clockwise to lower the door
Adjust each hinge in small steps, usually ¼ turn at a time.
For a three-hinge door:
- Adjust the bottom hinge slightly.
- Adjust the middle hinge.
- Adjust the top hinge.
- Close the door and check alignment.
This keeps the sash level instead of forcing it upward from one point.
4. Check the door position after each adjustment
After raising the door, check:
- The bottom of the door clears the threshold
- The gap between the door and frame is even
- The handle locks smoothly without force
- The locking rollers and hooks align with their keeps
Do not continue raising the door if the handle becomes stiff or the lock starts catching, as this usually indicates the door needs side or compression adjustment rather than more height.
5. Secure the final position
Once the door closes correctly:
- Tighten any loose hinge fixing screws
- Refit the hinge covers
- Test the door several times from fully open to fully locked position
A correctly raised uPVC door should move freely while still compressing the weather seals enough to maintain insulation and weather protection.
What If the Door Still Feels Tight?
Height is not always the whole problem. A door can clear the threshold yet rub against the frame near the lock. That points to sideways alignment. A stiff seal may need compression adjustment instead.
The door care guide is useful for checking dirt, dry hardware and worn seals before more hinge movement. Horizon also advises routine cleaning with mild soap plus suitable lubrication for moving parts.
Once the door shuts cleanly, further turning should stop. A few unnecessary turns can trade a scrape for a draught.
When Should the Adjustment Stop?
A screw that spins without lifting the door may be stripped. A hinge pulling away from the frame is another warning. Cracked uPVC, loose fixings or a visibly twisted sash need more than a basic adjustment.
Repeated dropping often points to worn hinges, weak fixings or movement in the frame. A heavily glazed uPVC front door may also be awkward to support safely without help.
The lock deserves attention too. If the handle remains stiff after the door sits square, forcing it can damage the gearbox.
Conclusion
A small hinge adjustment can stop a uPVC door scraping and bring the lock back into line. The safest approach is slow: identify the hinge, mark the starting point and test after every turn.
Where the adjustment no longer holds, Horizon Windows’ door range provides a practical starting point for deciding whether the existing door needs repair or replacement.
