Door Not Closing or Latching Properly: Diagnostic Guide

Summary

A door that will not close properly is the small job every carpenter, handyman and landlord gets asked about, and it is a diagnostic problem before it is a carpentry one. The customer usually describes the symptom — "it won't shut", "you have to slam it", "it springs back open", "it catches at the top" — and reaches for the solution they have seen on the internet, which is to plane the edge. In most cases planing is the wrong fix: the door has not grown, it has dropped or moved on its hinges, or the frame has moved around it, and taking 3 mm off the leading edge leaves a door that still catches and now has a gap at the hinge side. The right sequence is to look at the hinges, then the latch and strike, then the gaps, and only then at the timber.

The stakes are higher than a sticking door when it is a fire door. In a flat, a three-storey house, a loft conversion or an HMO, the doors onto the protected stairway are FD30 fire doors that must self-close and latch under Approved Document B, and a fire door that stands 10 mm open because the closer cannot overcome a binding latch provides no fire separation at all. The Fire Safety (England) Regulations 2022 require responsible persons in multi-occupied residential buildings over 11 m to check flat entrance doors annually and communal doors quarterly, and "does it close fully from any position" is the first check. This guide gives the decision tree, the tests that identify each fault, the fixes in order of least intervention, and the specific rules for fire doors.

For hanging a door from scratch see door hanging step by step and internal door hanging; for frame and lining work see door frame fitting; for pricing see internal door fitting pricing guide.

Key Facts

• Gaps — a correctly hung internal door has 2–3 mm at the head and both sides, and 6–10 mm at the bottom over the finished floor (8–10 mm over carpet). Fire doors: 2–4 mm at head and sides, maximum 10 mm at the threshold (3 mm where smoke seals are required at the threshold, or a threshold seal fitted)
• Hinge screws — the commonest cause of a dropped door. Standard 25–30 mm screws into a lining pull out; refix the top hinge with 60–70 mm screws through the lining into the stud or frame. On a 35 mm door with three hinges the top hinge carries most of the load
• Hinge-bound — hinge leaves recessed too deep so the door edge meets the frame before the door is closed and it springs open; pack the recess with card or 1 mm plastic packers under the leaf
• Latch and strike — the latch bolt must enter the strike-plate aperture with 1–2 mm clearance; a bolt that lands above or below the aperture by 2 mm will not latch. Mark the bolt with chalk or lipstick, close the door, and read the mark on the strike
• Door drop — measured as the difference between the gap at the top of the latch side and the top of the hinge side; more than 2 mm difference and the door has dropped or the frame has moved
• Seasonal swelling — softwood and veneered doors take on moisture in autumn and winter and can grow 1–3 mm across the width; a door that binds only in winter needs 1–2 mm off the leading edge and all edges sealed, not 5 mm off in January
• New flooring — a 10 mm carpet with underlay on a floor that had vinyl means 10 mm off the bottom of the door; a fire door bottom edge must not be trimmed by more than the certification allows (typically 3–10 mm; check the label)
• Frame movement — a lining that has racked (gone out of square) shows as a gap that tapers from top to bottom on the latch side; check with a long level on the jamb and a square at the head
• Latch failure — tubular latches (£5–£15) wear; a bolt that will not retract fully, a follower that spins, or a spring that no longer returns the bolt all mean replacement, not adjustment
• Handle too tight — a lever handle with the through-fixings over-tightened pinches the latch follower and the bolt will not spring out; slacken the handle screws a quarter turn first
• Closer strength — overhead closers are rated EN 1–7 under BS EN 1154; a fire door needs a minimum EN 3 for an 838 mm or 926 mm leaf; a closer that cannot overcome the latch is under-rated, not broken
• Closer adjustment — sweep speed (opening to about 15°), latching speed (last 15°) and backcheck; a door that stops short of the latch needs latching speed increased, not sweep
• Intumescent seals — fire doors have 10 mm or 15 mm intumescent strip (and smoke seal) in the frame or door edge; a seal that has lifted or been painted over can stop the door closing and must be replaced, not trimmed
• Fire doors, Approved Document B — doors to a protected stairway in flats and in houses of three or more storeys, and loft-conversion enclosures, must be FD30 (or FD30S with smoke seals) self-closing; the certification is by the door-set's test evidence and the label on the top edge
• Fire Safety (England) Regulations 2022, reg 10 — in multi-occupied residential buildings over 11 m, flat entrance doors to be checked at least annually and communal fire doors at least every three months; the check includes closing fully from any position
• Hinges — fire doors need three CE/UKCA-marked hinges to BS EN 1935, grade 11 or above for a 44 mm FD30 leaf; two hinges on a 44 mm door is a fault in itself
• Planing — always take from the hinge side where possible (it is hidden and preserves the latch alignment); never plane a fire door beyond its certified lipping allowance

Quick Reference Table

Detailed Guidance

Decision tree

DOOR WILL NOT CLOSE / LATCH
│
├─ Does the door reach the closed position (face flush with the stop)?
│   │
│   ├─ NO — it stops short or catches
│   │     └─ WHERE does it catch?
│   │          ├─ Top of latch side → door has DROPPED (or hinge side head gap grown)
│   │          │     Test: measure gap at top latch side vs top hinge side.
│   │          │     Fix: refix TOP hinge with 60–70 mm screws into the stud;
│   │          │          pack the bottom hinge if still out.
│   │          ├─ Bottom of latch side → frame racked, or top hinge over-packed
│   │          │     Test: long level on both jambs; square at head.
│   │          │     Fix: adjust hinge packing; refix the lining if it has moved.
│   │          ├─ Full length of latch edge → swelling or door too wide
│   │          │     Test: does it bind only in wet months?
│   │          │     Fix: 1–2 mm off HINGE edge, seal all edges incl. top & bottom.
│   │          ├─ Along the bottom / floor → floor height change or drop
│   │          │     Fix: refix hinges first; then trim bottom (fire door: within label limit).
│   │          └─ Along the head → head out of level or door swollen
│   │                Fix: pack hinges; trim head sparingly.
│   │
│   └─ YES — it reaches the stop but...
│         ├─ Springs back open → HINGE-BOUND
│         │     Test: close slowly, watch hinge-side edge touch frame before fully shut.
│         │     Fix: pack hinge recess (card/1 mm packers) under the leaf;
│         │          or hinge screws proud — countersink/replace.
│         ├─ Closes, no latch click, opens with a push → LATCH MISSING STRIKE
│         │     Test: chalk the bolt, close, read the mark on the strike plate.
│         │     Mark above aperture → door has risen/strike low: move strike up.
│         │     Mark below aperture → door dropped: refix hinges FIRST, then strike.
│         │     Mark inboard/outboard → door not reaching: check stop and seals.
│         │     Fix: file the aperture (≤2 mm) or move the plate; refix hinges.
│         └─ Latch bolt does not spring out, or handle stiff → LATCH / HANDLE
│               Test: slacken handle through-bolts a quarter turn; work handle.
│               Fix: if still stiff, remove latch and test in hand; replace if worn.
│
FIRE DOOR (FD30/FD60) THAT DOES NOT CLOSE FULLY FROM ANY POSITION
│
├─ Open to 45°, release. Does it latch?
│   ├─ NO, stops short → latching speed too slow / closer under-rated / binding
│   │     1. Check for binding and hinge issues as above (fix these first).
│   │     2. Check intumescent/smoke seals: lifted, painted, wrong size → replace.
│   │     3. Increase closer latching speed; if max and still short → closer
│   │        under-rated (needs EN 3 minimum for standard leaf) → replace.
│   ├─ YES at 45° but NOT from 5–10° → latching action/backcheck → adjust; latch
│   │     too stiff → replace latch with a fire-rated one.
│   └─ Gaps > 4 mm at head/sides or > 10 mm at threshold → re-hang / replace leaf
│         (do not pack with timber strips; the seal and the certification govern).

Step 1: hinges

Open the door to 90° and lift it by the handle edge. More than a millimetre or two of movement at the top hinge means the screws have pulled or the hinge is worn. Look at the hinge leaves: screws proud of the leaf (door will not close flat), leaves let in deeper than their thickness (hinge-bound), a leaf let in only on one side so the door sits off-centre. The fix in order:

1. Refix — replace the two outer screws of the top hinge frame leaf with 60–70 mm screws that pass through the lining into the stud or frame behind. If the holes are stripped, plug with glued dowel or matchsticks and re-drive. This alone cures most dropped doors
2. Pack — if a hinge recess is too deep, pack behind the leaf with card or a 1 mm plastic packer until the leaf sits flush. If the door needs to move toward the latch side at the top, pack the bottom hinge; to move it away, pack the top hinge
3. Replace — a hinge with visible wear at the knuckle (the door rocks on it) is replaced like for like; fire doors need a hinge to BS EN 1935 of the grade on the certificate

Step 2: latch and strike

With the door closing fully against the stop but not holding, rub chalk on the end of the latch bolt, close the door, open it and look at the strike plate. The chalk mark shows where the bolt lands relative to the aperture:

• Above or below by up to 2 mm — file the aperture out with a flat needle file, or move the strike plate if more; fill the old screw holes
• Above or below by more than 3 mm — the door has moved, not the strike; go back to the hinges before touching the plate, because moving the strike to meet a dropped door leaves the gaps wrong and the door will drop further
• Short of the aperture (not reaching) — something is stopping the door closing the last 2 mm: a seal, a painted stop, a swollen edge, a hinge-bound condition. Fix that, not the strike
• Latch does not spring out — remove the handles, test the latch: a bolt that will not return has a failed spring; replace the latch (tubular latch, 64 mm or 76 mm backset to match). Check the handle fixings are not pinching the follower first — over-tightened through-bolts stiffen the action on half the handles in the country

Step 3: gaps and binding

Run a 2 mm and a 3 mm packer around the door in the closed position. Even gaps all round and the door is fine; the problem was the latch. A gap that tapers tells the story: wide at the top of the latch side and tight at the bottom is a dropped door; the reverse is a racked frame or an over-packed top hinge; tight all along the latch edge is swelling. Where a door binds on a painted stop or a build-up of paint on the edges, scraping the paint off both surfaces recovers 1 mm without a plane.

Plane only when the hinge and strike work is done and the door still binds. Take the timber from the hinge edge (remove the door, plane, re-let the hinges) so that the latch side is untouched; a 1–2 mm pass is usually enough. Seal the planed edge and the top and bottom edges with primer or varnish — a door that swells every winter is usually one with bare edges.

Step 4: floor changes

A new carpet, a laminate on underlay or a tiled floor raises the finished level by 8–20 mm and a door that previously cleared now scrapes. Confirm the hinges first (a dropped door scrapes too), then trim the bottom. Mark the line with the door hung, allowing 6–10 mm over the finished floor (more on carpet), remove the door and cut with a track saw or a sharp hand plane, then seal the cut edge. On a fire door, the label on the top edge or the manufacturer's data sheet states how much can be removed from the bottom edge without breaking the certification; it is commonly 3–10 mm, and a door that needs more than that is replaced, not trimmed.

Fire doors

A fire door that does not close and latch from any position is a failure, and in a building where the Fire Safety (England) Regulations 2022 apply it is a recorded failure. The sequence:

1. Binding and hinges — fix as above. Fire doors are heavier (44 mm, 35–50 kg) and need three hinges; two hinges or hinges without a grade marking are a defect in themselves
2. Seals — intumescent strips (10 × 4 mm or 15 × 4 mm) and the brush or fin smoke seal must be continuous, unpainted and seated. A lifted or painted seal stops the door closing by 2–5 mm and is replaced with the correct size, never trimmed down
3. Gaps — 2–4 mm at head and sides measured with a gap gauge; up to 10 mm at the threshold (3 mm or a threshold seal where FD30S). Gaps outside these mean re-hanging or a new leaf, not a strip of timber on the stop
4. Closer — overhead closers to BS EN 1154 with a power size of at least EN 3; open the door to 45° and release — it must latch; open to 10° and release — it must still latch. Adjust the latching speed valve (not the sweep) in quarter turns. A closer on maximum that still cannot latch the door is under-rated for the leaf weight or fighting a stiff latch; replace the closer or fit a fire-rated latch with a lighter spring
5. Latch — fire doors need a latch or lock with fire-test evidence; a domestic tubular latch is not it. Check the keep is fire-rated and fixed with the specified screws

Record the check, the defect and the fix. In an HMO or a block, the responsible person needs it for the fire risk assessment; see hmo fire safety and part b fire.

What to charge

A dropped internal door refixed and the strike adjusted is 30–45 minutes; price it as a half-day minimum (£80–£150) if it is the only job, or £40–£70 as an add-on to other work. A door planed, re-hung and the edges sealed is 1–1.5 hours. A fire door brought back into compliance (seals, hinges, closer adjustment) is 1–2 hours with £40–£120 of parts. Replacing a latch is 20 minutes plus the £5–£15 latch. See internal door fitting pricing guide and fire door installation pricing guide.

Frequently Asked Questions

Why does my door spring back open when I close it?

It is hinge-bound: the hinge leaves are let into the door or frame deeper than their own thickness, so the hinge-side edge of the door touches the frame before the door is fully closed and the hinge acts as a spring. Pack behind the hinge leaves with card or thin plastic packers until the leaves sit flush. Screws standing proud of the hinge leaf do the same thing; countersink or replace them.

Should I plane the door or adjust the hinges?

Hinges first, always. Nine times out of ten the door has dropped on loose hinge screws or the hinge recesses are wrong, and refixing the top hinge with 60–70 mm screws cures it in ten minutes. Planing a dropped door leaves it still dropped with a bigger gap. Plane only when the gaps are even, the hinges are solid and the door still binds — and then take 1–2 mm from the hinge edge and seal it.

How big should the gap round a door be?

2–3 mm at the head and sides for a normal internal door, 6–10 mm at the bottom over the finished floor. Fire doors: 2–4 mm at the head and sides and no more than 10 mm at the threshold (3 mm, or a threshold seal, where smoke sealing is required). A 2 mm packer and a 3 mm packer in the pocket are the tools for the job.

My fire door won't close on its own — can I just take the closer off?

No. A fire door to a protected stairway, a flat entrance or a loft-conversion stair must self-close under Approved Document B, and removing the closer removes the fire protection. Fix the reason it will not close — binding, lifted seals, loose hinges — then adjust the closer's latching speed. If the closer on maximum still cannot latch it, the closer is under-rated for the door and needs replacing with at least an EN 3 closer.

The door only sticks in winter — what's wrong?

Nothing structural; the door is taking on moisture and growing 1–3 mm across its width. Take 1–2 mm off the hinge edge in winter (not 5 mm, or it will rattle all summer), and seal every edge including the top and bottom with primer or varnish so that it stops breathing. Bare top and bottom edges are the usual reason a door swells every year.

Regulations & Standards

• Building Regulations 2010, Approved Document B (Volume 1: Dwellings), Appendix C — fire door provisions: FD30/FD30S, self-closing devices, which doors in flats, three-storey houses and loft conversions must be fire doors

• Fire Safety (England) Regulations 2022 (SI 2022/547, reg 10) — annual checks of flat entrance doors and quarterly checks of communal fire doors in multi-occupied residential buildings over 11 m

• Regulatory Reform (Fire Safety) Order 2005 (SI 2005/1541) — responsible person's duties in the common parts of multi-occupied buildings and in HMOs

• Housing Act 2004 and the Housing Health and Safety Rating System — fire as a hazard in HMOs; LACORS fire safety guidance for housing

• BS EN 1154:1997 — controlled door closing devices; power sizes EN 1–7

• BS EN 1935:2002 — single-axis hinges; grades for fire doors

• BS EN 1634-1:2014+A1:2018 — fire resistance and smoke control tests for door sets (the basis of FD30 certification)

• BS 8214:2016 — timber-based fire door assemblies; code of practice (gaps, seals, hinges, installation)

• BS 476-22:1987 — fire tests on building materials and structures (legacy FD30 test evidence still referenced on older doors)

• BS EN 12209:2016 — mechanically operated locks and latches

• BS 4787-1:1980 — internal and external wood door sets, door leaves and frames; dimensional requirements

• Equality Act 2010 and Approved Document M — door closer opening forces (≤30 N from 0–30°, ≤22.5 N from 30–60°) where accessible routes apply

• HM Government — Approved Document B, Volume 1: Dwellings — Appendix C fire door provisions

• GOV.UK — Fire Safety (England) Regulations 2022: fire door guidance — regulation 10 checks and what to look for

• British Woodworking Federation — Fire Door Alliance: five-step fire door check — gaps, seals, hinges, closers, certification

• BSI — BS 8214:2016 timber fire door assemblies — installation and maintenance code of practice

• Door & Hardware Federation — Technical guidance on closers and hinges — power sizes and hinge grades

• LACORS — Housing fire safety guidance — fire doors in HMOs

• door hanging step by step — hanging a door correctly so it does not come back

• internal door hanging — hinge positions, gaps and latch heights

• door frame fitting — linings and frames that stay square

• internal door fitting pricing guide — pricing door adjustments and re-hangs

• fire door installation pricing guide — pricing fire door remedials and replacements

• part b fire — which doors must be fire doors and why

• hmo fire safety — fire door checks in HMOs

• second fix carpentry — the second-fix sequence doors sit in