Why Won't My UPVC Door Lock? Common Causes and Fixes
A UPVC door that won't lock is a security risk you shouldn't ignore. The good news: most causes are a quick, affordable repair.
The door has dropped on its hinges
UPVC doors can drop slightly over time, so the multipoint locking points no longer line up with the keeps in the frame. You'll often notice you have to lift the handle hard, or the door catches as it closes.
Adjusting the hinges and keeps to realign the door usually solves this without any new parts.
A worn or broken gearbox
If the handle has gone floppy or 'dropped' and won't engage the lock, the gearbox inside the multipoint mechanism has usually failed. This is one of the most common UPVC faults.
A locksmith replaces the mechanism — we carry common brands like Yale, Fullex, ERA and Winkhaus — usually on the same visit.
A faulty cylinder or key problem
If the key won't turn or feels stiff, the euro cylinder may be worn or damaged. Replacing the cylinder is quick and cost-effective, and a good moment to upgrade to an anti-snap cylinder for better security.
Don't leave a door that won't lock — it's both a security and safety issue. Call us in Catford or SE London and we'll diagnose it on-site and usually fix it the same day.
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Every visit is handled with a security-first approach. We check the door, frame, keep, cylinder, handle, closer or mechanism before recommending a repair, so customers understand whether the fault is a simple adjustment, a lock replacement, a UPVC gearbox failure, a commercial door alignment issue or urgent make-safe work after damage.
For local SEO and customer clarity, this page connects the main Catford locksmith service with nearby South East London areas and the exact services customers search for. The business covers urgent and booked work for homes, rented flats, landlords, shops, offices, salons, restaurants and other local premises that need a reliable locksmith or commercial door specialist.
- Emergency locksmith response in Catford and SE6
- Domestic lock repairs, lost keys and lock replacements
- UPVC door locks, multipoint mechanisms and anti-snap cylinders
- Commercial locksmith work, shop doors and door closer repairs
- Burglary repairs, boarding up and same-day make-safe support
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Call 07557 957349 or send an enquiry for locksmith help from Bromley Rd, London SE6 2TS. You can also view the local base on Google Maps.