uPVC Window Won’t Open, Close or Lock? Causes, Fixes & What To Do

Max the Locksmith · July 2026

The short answer: a uPVC window that won’t open, won’t close fully or won’t lock almost always comes down to one of three parts — the handle, the friction hinges, or the espagnolette locking mechanism inside the sash — and all three are repairable without touching the glass or the frame. Work through the checks below to name your fault, then call 07552 421433 with the answer: Max carries the common window handles, espag gearboxes, rods and hinges in the van, so most windows are fixed in one visit. Labour is a flat £85 + parts (+ VAT) — averages below, full detail on the price guide.

Start here: the handle test

Grip the handle and turn it gently with the window shut. If the handle turns but nothing moves inside the frame, the spindle or the little gearbox inside the handle has stripped — a handle fault, the cheapest fix of the lot, covered fully in the window handle guide. If the handle won’t turn at all and feels solid, the espag mechanism inside the sash has seized — usually in the locked position. If the handle works but the window won’t pull in tight, catches at a corner, or drops as it swings, the friction hinges have worn — the hinge guide takes that one from here.

Won’t open: work down this list

Handle turns freely, window stays shut — stripped handle spindle or gearbox. The mechanism is probably fine; don’t force anything.

Handle stuck solid in the locked position — seized espag. This is the one to treat gently: forcing the handle snaps the drive connection between handle and mechanism, and a snapped connection turns a stiff window into a permanently locked one. Stop at “stiff” and it opens without damage; Max frees jammed espags non-destructively before replacing the failed part.

Window opens an inch then stops — a jammed restrictor or child-safety catch, not the lock. Restrictors stick when their pivots corrode; freeing or replacing one is minutes.

Tilt-and-turn behaving strangely — tilt-and-turns have a gearbox that switches modes, and turning the handle with the sash mid-position knocks them out of sequence: the window either jams or hangs alarmingly from one corner. Don’t push the sash back — supporting it wrongly bends the stay arms. This is a known fault with a known reset procedure, and it’s one of the most common window calls Max gets in modern flats around NG1 and the riverside developments.

Painted or swollen shut — older windows in summer, or after decorating. If the hardware felt fine last month and the jam arrived with hot weather, the sash has expanded — the same physics as a swollen uPVC door. Try a cool morning before paying anyone.

Won’t close: it’s alignment until proven otherwise

A window that closed for years and now won’t is rarely a lock fault. Look at the gap between sash and frame from inside: a wedge-shaped gap — tight one corner, daylight at the other — means the sash has dropped on worn hinges and is landing crooked against the frame, so the locking cams miss their keeps. That’s a hinge-and-alignment repair, and it’s also why the window suddenly whistles or lets a draught through — one fault, several symptoms. The hinge repair guide covers the failure signs in depth, including the streaky grey deposits worn hinges leave on the frame below them (the same tell as on door hinges).

Something rattling inside the frame when you move the sash? A locking cam or keep screw has come adrift and is fouling the closing path. Fishing it out and refitting it is routine — but stop closing the window against it, because mushroom cams dent soft uPVC keeps quickly.

Won’t lock: two culprits, one test

Open the window fully and operate the handle in mid-air. Smooth and full-travel with the window open = the mechanism is healthy and the sash is simply missing its keeps — alignment again. Stiff, gritty or short-travel even with the window open = the espag itself is failing internally. That distinction matters because the first is often adjustment only, while the second means the mechanism (or its gearbox) is on the way out — and knowing which before the visit is how the right part arrives first time. It’s the same open-door logic as the uPVC door won’t lock guide, scaled down.

While you’re there, look at the mushroom cams along the sash edge: bright, shiny scrape marks on cams that are otherwise dull mean they’re fighting their keeps — early-stage misalignment you can catch before it kills the mechanism. If the window only locks when you press the sash in with your other hand, that’s the same story, later chapter.

What not to do (from the jobs that went wrong)

Don’t lever the sash with a screwdriver — uPVC profiles dent and gaskets tear, and the repair grows a re-glazing bill. Don’t spray oil blindly into the lock strip: light oil on hinge pivots is fine, but flooding the espag gearbox washes its grease out and gums the works with dust (graphite or PTFE for anything key- or cam-shaped — the same rule as stiff door locks). And don’t keep slamming a window that needs a shoulder to close — every slam is a hammer blow to the cams and keeps.

Parts, and the “we don’t have it” question

Max’s van stocks the common Nottingham window hardware: espag rods and gearboxes in the popular patterns (Maco, ERA, Avocet and equivalents), friction hinges in the standard sizes, handles in every spindle type. That covers the large majority of windows in one visit. On the rare window where the part is obsolete or has to be ordered — some 1990s systems, odd sash sizes — the window never stays broken overnight: it’s freed, made secure in the closed-and-locked sense (temporary keeps, secured sash), and finished properly when the part lands, usually next day. You’re never left with a window that neither opens nor locks.

What it costs (on average)

Most window repairs land small: handles average £10–£40 in parts, espag mechanisms £20–£80, friction hinges £15–£60 a pair, all under the flat £85 labour + VAT — and extra windows on the same visit add only parts plus a small top-up, so whole-house rounds are the economical way. The honest caveat: the occasional obsolete or specialist mechanism can run £250–£500+ in parts. Those are the exception, and either way you get a final figure on the phone before anyone sets off — price guide.

Quick answers

Why won’t my uPVC window open at the top or bottom corner?

One friction hinge has worn or slipped, so the sash pivots unevenly and binds. Hinges are replaced in pairs and the sash re-set square — see the hinge guide for the failure signs.

My window handle is jammed in the locked position — can it be freed without breaking anything?

Almost always. The fault is the handle’s own gearbox or a seized espag, and both are freed non-destructively before the failed part is swapped. The one thing that does cause damage is forcing the handle — stop at stiff.

My tilt-and-turn window is stuck in tilt mode or hanging from one corner — what do I do?

Support the sash gently and stop operating the handle — it’s out of sequence, not broken. Resetting the mechanism is a routine visit; wrestling it back yourself bends the stays.

The window locks but I can pull it open slightly — is that normal?

No — the cams aren’t reaching their keeps, usually from hinge wear or keep drift. It’s an alignment fix, and worth doing: a window that “locks” without compressing its seals is neither secure nor draught-proof. See window lock repair.

Do I need to replace the whole window?

Very rarely. Handles, hinges, restrictors and mechanisms are all serviceable parts at a fraction of new glazing. When a frame genuinely is past saving, Max says so and you’ve lost nothing — the same repair-first rule as doors.

Can you fix windows the same day across Nottingham?

Usually — the common parts travel in the van, and anything rarer gets the window made usable and secure until the part arrives. Same-day cover runs across Nottingham, West Bridgford, Beeston, Arnold, Hucknall and out to Derby and Mansfield — see same-day locksmith.

Sorted? What most readers check next

• Window repairs — locks, hinges & handles
• uPVC Window Handle Replacement guide
• uPVC Window Hinge Repair & Replacement
• Window Lock Repair, Replacement & Insurance
• How Secure Are uPVC Windows?

Window fighting you today? Call 07552 421433 or WhatsApp a photo of the window edge — £85 + parts (+ VAT), no call-out fee, same price 7 days.