uPVC Door Won’t Lock? Handle Lifts But Won’t Lock — Causes, Fixes & Costs

The short answer: when a uPVC door handle lifts but the key won’t turn — or the handle won’t lift at all — the fault is almost always one of three things: door alignment, a failing gearbox, or the cylinder. There’s a 30-second test below that tells you which. Repairs run £85 + parts (+ VAT), with gearboxes typically £20–£180 and full pricing published in the price guide.

The open-door test — do this first

Open the door so it’s clear of the frame, then lift the handle and try the key. If everything works smoothly with the door open, your mechanism is fine — the door has dropped or shifted so the locking points miss the keeps in the frame. That’s an alignment job. If the handle is still stiff, crunchy or floppy with the door open, the fault is inside the mechanism itself — usually the gearbox — and it’s telling you to stop lifting before it fails shut.

Cause 1: alignment (the most common, and the cheapest)

Doors drop on their hinges over time — gravity, slamming, summer expansion. The hooks and rollers start scraping into the keeps instead of gliding, the handle needs more and more force, and one day it “won’t lock”. The fix is hinge and keep adjustment, and on most visits that’s the whole job: £85 flat, no parts.

Cause 2: the gearbox

The gearbox is the heart of the multipoint mechanism — and the first thing to die when a misaligned door gets forced for months. Symptoms: the handle flops with no resistance, jams halfway, or the key turns without throwing the bolt. Genuine replacement gearboxes run £20–£180 depending on brand; Max carries the common Nottingham patterns (Ferco, GU, Maco, Fuhr) in the van, so most swaps happen in one visit. Cheap pattern copies exist — thinner metal, smaller springs — and they’re exactly why some repairs don’t last; Max fits genuine or proven equivalents only.

Cause 3: the cylinder

If the handle lifts fine but the key won’t turn — or turns without locking — the euro cylinder itself may have failed. Replacement cylinders are £25–£120 fitted under the same £85 labour, with snap protection as standard; if your current one is a basic budget cylinder, the swap is also a security upgrade — see whether anti-snap locks are worth it (short version: yes).

Locked out because of it?

A deadlocked uPVC door that won’t open is an emergency job — 30-minute response target across Nottingham, and the same flat pricing day, evening and weekend, with overnight call-outs (10pm–6am) from £95 + VAT. Many can be opened by manipulating the mechanism; where drilling is genuinely the only way in, it’s agreed first — and because the failed part is replaced as part of the repair, the finished door shows no trace of it.

What it costs (real numbers)

Alignment only: £85 + VAT, done. Gearbox swap: £85 + gearbox (£20–£180) + VAT. Full multipoint strip where the whole mechanism has gone: £85 + £40–£250 + VAT, genuine parts. Cylinder: £85 + £25–£120 + VAT. Find a second fault while Max is there — say a stiff window mechanism — and it’s typically about £45 more in labour, often nothing. Everything is quoted as a final figure on the phone before anyone sets off; the full breakdown lives on the price guide.

Quick answers

Can I keep using the door gently until it’s fixed? If the open-door test showed alignment: yes, gently. If the mechanism is stiff with the door open: stop — the next failure mode is deadlocked shut.

How long does a gearbox swap take? Usually 45–60 minutes when the pattern’s in the van.

Is this covered by insurance? Wear-and-tear usually isn’t — but after a break-in it often is; see what to do after a burglary.