Smart locks · Anti-snap cylinders · Emergency lockouts — 24/7 across London & the Home Counties
Fixed price before we start · no call-out fee

uPVC & Composite Door Lock Repair

Stiff handle, door won't lock, or the mechanism's given up? Stellar Locksmith repairs and replaces uPVC multipoint locks and realigns the door so it locks smoothly again.

4.9 on Google · 158 reviews Usually 20–40 min No call-out fee DBS-checked
uPVC & Composite Door Lock Repair
DBS-checked engineers No call-out fee Non-destructive entry British Standard locks Fixed price up front 12-month guarantee

Mechanism repair and replacement

We carry the common multipoint gearboxes and full strips on the van and can match the vast majority of brands, including discontinued ones. If the gearbox has failed with the door locked shut, we open it non-destructively first, then swap the mechanism. Handles, keeps and hinges are replaced where they're worn.

Realignment: the fix most people miss

Half of 'broken' uPVC locks are simply doors that have dropped a few millimetres over the years. We adjust the hinges and keeps so the bolts line up again, and the handle goes from a two-handed heave back to a one-finger lift. We do this on every uPVC job, not just when you ask.

Upgrade the cylinder while we're there

The euro cylinder in most uPVC doors is the weakest point in the house — a standard one can be snapped in seconds. We'll fit a TS007 3-star anti-snap cylinder at the same time if yours isn't one already, which is what insurers now expect and what actually keeps burglars out.

The handle you have to lift with both hands

Almost every uPVC and composite door in the country runs on a multipoint lock: lift the handle, bolts shoot into the frame, turn the key. When it starts sticking, the handle gets stiff or the door won't lock at all, it's usually the gearbox in the mechanism wearing out, or the door dropping on its hinges so the bolts miss the keeps. Both are everyday fixes for Stellar Locksmith — not a reason to replace the door.

Lockouts
from £59
Lock changes
from £75
Call-out fee
none, ever
  • DBS-checked, fully insured engineers
  • British Standard locks on every van
  • Non-destructive entry wherever possible
  • 12-month guarantee on parts and labour
FAQ

Questions people ask us

My uPVC door won't lock — do I need a new door?+

Very rarely. It's almost always the multipoint mechanism or the door alignment, both of which we fix in one visit.

Can you repair a patio or French door?+

Yes — sliding patio doors, French doors and composite doors all use similar multipoint hardware we carry.

The door is stuck locked shut. Can you still fix it?+

Yes. We open it non-destructively first, then replace the failed mechanism.

Is the repair guaranteed?+

Every mechanism we fit and all our labour is guaranteed for 12 months.

Other services

Emergency Lockout Service

Locked out of your house, flat or shop? Stellar Locksmith opens the door fast and without damage, 24 hours a day — usually within 30 minutes.

From £59

Lock Change & Replacement

New tenancy, lost keys or a worn-out lock — Stellar Locksmith supplies and fits British Standard locks on the spot, keyed-alike if you want one key for every door.

From £75

Burglary Repair & Boarding Up

Forced door or broken frame after a break-in? Stellar Locksmith boards up, repairs the damage and fits new locks the same day, with a written report for your insurer.

Fixed quote

Moving House Lock Change

You don't know who still has keys to your new place. Stellar Locksmith changes every external lock in one visit — often the day you complete — all keyed alike.

Fixed quote
Reviews

What our customers say

4.9 on Google · 158 reviews

“Keypad lock fitted for the kids so no more lost keys. Engineer paired it to our phones and left the paper key safe. Genuinely life-changing for a busy house.”

Zoe F. · Finchley · Smart lock · 3 days ago

“Locked out at 2am after a night out. Stellar answered straight away, engineer there in twenty minutes, door open with no damage. Worth every penny.”

Daniel O. · Loughton · Lockout · 1 week ago

“Upgraded all three doors to 3-star cylinders. Showed me the kitemarks, explained why the old ones snapped, and the insurer gave us a discount after.”

Imani C. · Pinner · Security upgrade · 2 weeks ago
Areas we cover

uPVC locks across 10 towns

We don't do car keys. Stellar Locksmith is a home and business locksmith. For vehicle lockouts or key programming you'll want an auto locksmith.

uPVC locks, sorted today.

Smart locks · Anti-snap upgrades · 24/7 lockouts

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