Repair guide
Sliding Patio Door Problems and How They Are Fixed
By the Newcastle Window and Door Repairs team
Last updated:
Sliding patio doors carry a lot of weight on a small number of rollers, so wear shows up as a door that gets heavier and heavier until one day it will not lock at all.
Almost all of it is repairable. Rollers, tracks, locks and adjustment are serviceable parts, and the door and glass usually stay exactly where they are.
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What each symptom points to
- Heavy or dragging slide: worn or collapsed rollers, or debris packed in the track
- Grinding or squealing: flat spots on the rollers and a dry or damaged track
- Door jumps or derails: rollers set too low, or a bent and worn track
- Will not lock or the hook misses the keep: the door has dropped out of alignment
- Draught and rattle along the closing edge: perished brush seals and interlock gaskets
- Water on the inside floor: blocked track drainage rather than a failed seal
Rollers and adjustment
Most patio doors have adjustable rollers reached through small caps at the bottom of the sliding leaf. Once the rollers are worn, adjustment alone cannot save them, and new running gear plus a proper reset transforms how the door feels.
Getting the height right also brings the locking hook back in line with its keep, which is why a door that would not lock often locks perfectly once the rollers are sorted.
Patio door repairs
- The door is heavy, grinding or sticks part way
- The sliding leaf has come off its track
- The lock will not catch or the handle spins
Locks and security on patio doors
Older patio doors can be a weak point. We fit better quality locks and anti lift devices where needed, replace worn shootbolts and keeps and can change cylinders on doors that take a key.
Keeping it right afterwards
- Vacuum the track regularly so grit does not chew the new rollers
- Keep the track drainage holes clear of debris
- Use a dry silicone lubricant rather than oil, which collects dirt
- Lift by the handle rather than pushing the glass
Guidance on cost
Typical price ranges
Guidance only. Size, specification, access and frame condition affect the price; a free inspection confirms it.
| Work and what affects its cost | Typical range |
|---|---|
| Patio roller replacement and realignmentDepends on the number of rollers and door weight | around £120 to £250 |
| Patio lock or shootbolt repairIncludes resetting the keeps and hook alignment | around £90 to £190 fitted |
| Brush seal and interlock gasket renewalStops the rattle and the draught along the closing edge | around £60 to £120 |
| Patio door glass unit replacementLarge toughened units, priced on size and access | quoted individually |
Repairs for patio door problems
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Questions
Frequently asked
Why has my patio door become so heavy to slide?
Almost always worn rollers, sometimes with grit packed into the track. New running gear and a proper adjustment restore a light slide.
My patio door will not lock. Does it need replacing?
Rarely. The door has usually dropped so the hook misses the keep, and correcting the roller height and keeps brings the lock back into line.
Can you repair French and bifold doors too?
Yes. French door alignment, shootbolts and slave door faults, and bifold hinge, roller and lock repairs are all work we carry out.
Water is getting in along the track. Is the door failing?
Usually the track drainage is blocked rather than the door being at fault, and clearing it along with renewing the seals solves it.
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