uPVC Window Hinge Repair & Replacement (Friction Hinges): Signs, Fixes & Guidance

Max the Locksmith · July 2026

The short answer: when a uPVC window drops at one corner, whistles in the wind, slams itself shut or won’t close fully, the friction hinges have worn — the pair of steel arms the sash rides on. They’re replaced in pairs, the sash is re-squared in the same visit, and no new window is needed. The signs below tell you how far gone yours are; Max carries the standard hinge sizes in the van, labour a flat £85 + parts (+ VAT), parts averaging £15–£60 a pair — price guide.

The five signs of a failing friction hinge

1. The daylight test. Close the window and look at the gap between sash and frame from inside: an even gap all round means the hinges are holding; a wedge-shaped gap — tight at one corner, daylight at the opposite — means the sash has dropped and is landing crooked.

2. It won’t stay open. Friction hinges hold the sash at any angle by design. A window that drifts or slams shut on its own has worn its friction pads smooth — there’s no adjusting your way out of fully worn pads.

3. Grey streaks below the hinges. Look at the frame under each hinge: dark, greasy-looking streaks are the hinge’s lubricant migrating out mixed with worn metal dust — the same early-warning stain that shows on failing door hinges. A hinge that’s marking the frame is grinding, not gliding.

4. Graunching or clicking as it swings. Healthy hinges are silent. Clicks are rivets working loose; graunching is metal on metal where the pads have gone.

5. Draughts and wind noise that arrived gradually. A dropped sash stops compressing its gaskets along one edge. Most “my window leaks air” calls in Nottingham are hinge wear, not failed glazing — and the fix is mechanical, not new glass.

Why hinges fail — and why it kills the lock next

Friction hinges carry the sash’s whole weight on two sliding shoes and a handful of rivets, outdoors, for decades. Wear is inevitable; what turns wear into a bigger bill is the knock-on: once the sash drops, the mushroom cams on the locking mechanism start scraping into their keeps instead of gliding behind them, the handle needs more force each month, and eventually the espag strips. It’s the identical drop-then-force story as a dropped door — replacing hinges early is what saves the lock.

Adjust, repair or replace?

Adjust: many hinges have a small friction screw on the arm — a quarter-turn stiffens a window that won’t stay open if the pads still have life. Some sag corrects with keep and hinge-shoe adjustment alone; when that’s the whole job, that’s the whole bill: £85 flat, no parts.

Replace — in pairs, always: one hinge worn means its partner has been stretched compensating. Sizing matters more than brand: hinge length (10″–24″), stack height (13mm vs 17mm), and side-hung vs top-hung geometry must match the sash, or the window won’t seal — the reason a keen DIYer with the wrong stack height ends up with a beautifully smooth window that whistles. Max measures and carries the common sizes (Nico, Cotswold and equivalent patterns).

Upgrade while you’re in there: bedrooms above ground floor should have egress (fire-escape) hinges that open the sash wide for escape — a like-for-like swap at replacement time and a real safety upgrade in HMOs and rentals. Restrictor hinges do the opposite for child safety. Coastal-grade stainless exists for exposed elevations; most Nottingham replacements are standard like-for-like.

What a hinge visit looks like

Sash lifted off, old hinges out, channels cleaned of twenty years of grit (half the noise is grit, not steel), new pair fitted, sash re-hung, keeps re-aligned so the lock throws sweetly, friction set to hold. Under an hour per window, usually. Multiple windows share the one labour charge with a small top-up each — hinge wear is a same-age-everywhere fault, so if one window’s gone, its siblings are close behind; doing the worst three or four in one visit is the economical pattern.

Hinges for odd or obsolete systems occasionally need ordering — in which case the sash is re-seated and secured so the window closes and locks properly in the meantime, and the swap finishes next day. A window is never left flapping or unlockable overnight.

What it costs (on average)

Adjustment-only visits: £85 flat + VAT, done. Standard replacements average £15–£60 a pair in parts under the same labour; egress and heavy-duty pairs sit toward the top of that. Rare specialist hinges for unusual systems can push £100+ a pair — you’ll know the exact figure on the phone first, as always: price guide.

Quick answers

How long do uPVC window friction hinges last?

Fifteen to twenty-five years depending on exposure, sash weight and use. South- and west-facing windows and big heavy sashes wear faster.

Why does my window slam shut on its own?

The friction pads have worn smooth so nothing holds the sash. If the friction screw is already wound in, the pads are done — replacement pair, and the hold-any-angle behaviour returns.

My window drops and catches the frame when I open it — hinges or frame?

Hinges, almost always. New pairs plus re-alignment square the sash so it swings clear and locks without force. Frames themselves very rarely move.

Can worn hinges really stop a window locking?

Yes — it’s the most common cause. The dropped sash makes the locking cams miss their keeps, and forcing the handle from there strips the mechanism. Fix the hinges and the “broken lock” often turns out fine.

What are the black or grey streaks under my window hinges?

Lubricant bleeding out of a wearing hinge, carrying metal dust with it — an early failure sign worth acting on before the sash drops. The same tell appears on door hinges.

Is it worth repairing, or should I just get new windows?

Hinges, handles and mechanisms are all serviceable parts; a pair of hinges costs a small fraction of one new window. If a frame is genuinely past saving Max says so straight — but it’s rare, and repairs preventing replacements is the house rule.

Sorted? What most readers check next

• Window repairs — locks, hinges & handles
• uPVC Window Won’t Open, Close or Lock?
• Door Hinge Failure Signs — all door types
• Window Lock Repair & Replacement

Dropped or draughty window? Call 07552 421433 — £85 + parts (+ VAT), no call-out fee, same-day across Nottingham, Derby & Mansfield.