Door Hinge Failure: Signs & Fixes for uPVC, Composite, Wooden & Bifold Doors

Max the Locksmith · July 2026

The short answer: hinges fail slowly and blame everything else on the way down — the “broken lock”, the “warped door”, the draught, the scrape on the floor are all classic hinge wear wearing disguises. The early tells below (including the one most people clean off without reading: dark oily streaks around the hinge knuckles) let you catch it as a cheap adjustment instead of a stripped gearbox. Hinge work runs the flat £85 labour + parts (+ VAT), most hinges averaging £10–£60 — price guide.

The six early signs of a failing hinge (any door type)

1. Dark, greasy streaks below the hinge knuckles. That black-grey smear running down the hinge or frame isn’t dirt — it’s the hinge’s factory lubricant migrating out, carrying microscopic worn metal with it. A hinge that’s marking its frame is grinding internally, and grinding hinges are dropping doors in slow motion. Wipe it off and it returns in weeks — that’s the confirmation.

2. The lift test. Grab the handle side of the open door and lift gently. Visible movement at the hinges — a clunk, a lift of more than a millimetre or two — means worn pins, bushes or flag stacks.

3. Creaks, clicks and graunches. Healthy hinges are silent. A creak is dry metal; a click is something loose; a graunch is metal on metal with the lubricant long gone (see sign 1).

4. The wedge-shaped gap. Close the door and read the gap between door and frame: even all round = healthy; tight at the top-latch corner, wide at the bottom-hinge corner = the door has dropped and is hanging off-square.

5. Rub marks and paint scuffs. A shiny scrape on the threshold, frame or floor is the door telling you where it’s landing — always the far, bottom corner first.

6. The lock got “worse”. Handle needs lifting harder, key needs a wiggle, door needs a shoulder — on multipoint doors the hooks are scraping their keeps because the door dropped, and forcing it from here is what kills gearboxes. If your “lock problem” arrived gradually, check the hinges before condemning the lock — the open-door test settles it in thirty seconds.

uPVC doors: flag hinges and the adjustment they hide

Most uPVC doors hang on flag hinges (the rectangular blocks) — and most people don’t know they’re adjustable in three dimensions: height, side-to-side (compression toward the lock side) and in-out (seal compression). A uPVC door that’s dropped a few millimetres is often cured by adjustment alone — the detail is in the dropped door hinge adjustment guide — and when the hinge itself has worn (streaks, lift-test clunk), flag hinges replace like-for-like without touching the door slab. Older uPVC ran butt and rebate hinges with less adjustment and more wear; all still serviceable. Adjustment-only visits are the cheapest on the menu: £85 flat, no parts, seals re-compressed, locking points re-aligned.

Composite doors: heavier slab, same hinges, bigger consequences

Composites hang on the same flag-hinge families but weigh substantially more — so wear arrives sooner on the same hardware, and because the slab also bows and swells seasonally, hinge wear and weather movement stack on top of each other. The practical rule: a composite that misbehaves year-round has a hinge/alignment fault; one that misbehaves seasonally is moving with the weather; many do both. Either way the answer is mechanical — adjustment, hinge packing or replacement — and catching it early protects the expensive lock behind it.

Wooden doors: screws first, hinges second

Timber doors fail differently: before the hinge itself wears, the screws let go of the timber — the top hinge carries the most load, its screws work loose, the door sags, and the latch misses the keep. The fixes escalate sensibly: longer screws into fresh timber, hinge recuts, packing behind the leaf, or new butt hinges (three on any solid door — heavy Victorian doors on two hinges are carrying too much on too little, a regular find in Sherwood and the Lace Market’s older stock). Brass hinges on heavy doors also wear ovally — the knuckle hole stretches and the door drops without a single loose screw; the streak test and lift test catch it. While the door’s being re-hung, it’s the natural moment to check the mortice lock still meets BS3621 and the keeps sit where the lock now lands.

Bifolds: hinges are half the story, carriages the other half

Bifold panels are chained together by hinges and carried by top or bottom roller carriages — and a fault in either shows up as the same symptom: panels that won’t meet, drop-bolts missing their sockets, a set that needs shoving to lock. Diagnose in order: carriage first (does the lead panel sit level as it travels?), hinges second (streaks, clunks, lift movement between panels), alignment third, and only then blame the locks and drop-bolts. Bifold hinge sets and carriages are serviceable parts — sticky bifolds very rarely need panels or glass.

What you can safely do yourself — and where to stop

Safe: a drop of light oil on squeaky hinge knuckles (hinges are the one place oil belongs — never in cylinders, which take graphite/PTFE), tightening visible loose screws, swapping a timber hinge screw for a longer one. Stop when: the door needs lifting to lock (adjustment territory — compensating by force wrecks the mechanism), the streaks keep returning (internal wear — the hinge needs replacing, not feeding), or anything on a uPVC/composite flag hinge beyond gentle cleaning — the three-axis adjustments interact, and a well-meaning quarter-turn on the wrong screw un-seals the door. That’s the visit to book: door repairs covers every type above.

Parts stock, and the overnight rule

Flag hinges in the common patterns, butt and rebate hinges, packers, long-thread fixings and bifold drop-bolts travel in the van — most hinge jobs are one visit, adjustment included, across Nottingham, West Bridgford, Beeston, Arnold and out to Derby and Mansfield. Some branded bifold carriages and obsolete flag patterns need ordering: when that’s yours, the door is left closing, locking and secure the same day — packed, re-hung or temporarily secured — and finished when the part lands, usually next morning. No door waits overnight unlockable.

What it costs (on average)

Adjustment-only: £85 flat + VAT — the most common outcome when hinges are caught early. On average: uPVC/composite flag hinges £15–£60 each, timber butt hinges £10–£40 a pair plus making-good, bifold hinge sets £20–£80. The honest caveat: branded bifold carriage sets and some proprietary hinge systems run £250–£500+ — rare, named before any work starts, and still a fraction of new doors. Price guide.

Quick answers

What are the black or grey streaks around my door hinges?

Factory lubricant migrating out of a wearing hinge, carrying worn metal dust — the earliest reliable sign a hinge is grinding internally. If it returns after cleaning, the hinge is failing, not dirty.

Can a dropped uPVC door be fixed without new hinges?

Often, yes — flag hinges adjust in three dimensions, and a few-millimetre drop is routinely cured by adjustment alone. Worn-out hinges (clunks, persistent streaks) get replaced like-for-like.

How many hinges should a wooden front door have?

Three on any solid external door. Heavy doors hung on two carry too much load per hinge — screws pull, knuckles stretch, and the sag returns however often it’s adjusted.

Why does my door only lock when I lift the handle-side up?

The door has dropped and you’re manually re-aligning it every time — hinge adjustment territory. Keep doing it by force and the gearbox strips; that’s the expensive version of this repair.

Are bifold door problems usually hinges?

Hinges or carriages — the two faults mimic each other. Check whether the lead panel travels level (carriage) and whether hinge knuckles show streaks or movement (hinges) before blaming the locks.

Should I oil my door hinges?

Yes — hinges are the one piece of door hardware where light oil belongs, once or twice a year on the knuckles. Persistent squeaks or streaks after oiling mean wear, not dryness. (Locks take graphite or PTFE, never household oil.)

Sorted? What most readers check next

• Dropped door? Hinge adjustment explained
• uPVC Window Hinge Repair & Replacement
• Composite Door Dropped or Bowed?
• French, Patio & Bifold Door Locks
• Door repairs — all door types

Streaks under the hinges, or a door that needs a lift to lock? Call 07552 421433 or WhatsApp a photo of the hinge — £85 + parts (+ VAT), no call-out fee, same-day.