Hanging doors in old houses with out-of-square frames

Short answerIn old houses frames are often out of square, floors slope and openings are non-standard, so a carpenter fits the door to the opening, adjusts or packs the frame, or fits a new lining during a renovation. Standard doors can only be trimmed a few millimetres per edge, and fire doors even less. Hanging a standard internal door typically costs £60 to £160 in labour outside London; in a listed building, replacing original doors can need listed building consent.

Hanging doors in old houses is a different job from hanging doors in a new build. Door frames are rarely square, floors slope, walls lean and openings are often a non-standard size. A perfectly square door will look wrong, catch on the floor or refuse to latch in a frame that isn't. The fix is not to force the door square but to fit it to the opening, or to adjust the frame so it is true, and a good carpenter will tell you which makes more sense.

This guide explains why doors misbehave in old houses, how a carpenter deals with an out-of-square frame, how much a door can be trimmed, when to keep original doors, and which rules can apply.

Why doors stick, swing or won't close in old houses

• Settlement. Over decades houses move a little. Lintels sag, walls lean and floors drop, and the frame goes out of square with them.
• Sloping floors. A door that clears the floor when shut may scrape it when open, or the other way round.
• Non-standard openings. Modern UK doors come in imperial sizes (1981mm high) and metric sizes (2040mm high). Many older houses were built to neither.
• Seasonal movement. Timber swells in damp weather and shrinks when it's dry and warm, so a door that sticks in winter may be fine in summer.
• Paint build-up thickens the edges and fills the gaps.
• Loose hinges. Worn screw holes let a door drop on the latch side.
• Damp. A door near a damp wall, or an outside door, can swell and eventually rot at the bottom.

Diagnosing the problem

Before replacing anything, a carpenter will usually check:

1. Are the hinges tight? A dropped door often just needs longer screws, or the holes plugging and re-drilling.
2. Where is it rubbing? Look for worn paint on the edge and frame.
3. Is the frame square? Measure the diagonals of the opening. If they differ noticeably, it's out of square.
4. Is the head level and are the sides plumb?
5. Is the floor level across the opening?
6. Is it seasonal? If it only sticks in wet weather, light planing may be enough.

Hanging doors in old houses: three approaches

1. Fit the door to the frame

The carpenter offers the door up, marks where it meets the frame, and planes or cuts it to follow the opening, so there is an even gap all round even if the door ends up slightly out of square. This is the traditional approach and keeps original frames and architrave. Hinges may be set slightly forward or back and the latch keep adjusted so it closes cleanly.

2. Re-set or pack the frame

If the frame has moved but is sound, it can sometimes be adjusted, packed out or partly re-fixed closer to square and plumb. This can disturb plaster and architrave, so it suits doors being replaced as part of wider work.

3. Replace the lining

Where walls are being plastered anyway, a new lining can go in square and plumb at first fix, the plasterer works up to it, and the door goes on at second fix. This gives the neatest result but changes the look of a period opening. See first fix and second fix carpentry explained.

Sloping floors

Options include cutting the bottom of the door at an angle to follow the floor, rising butt hinges that lift the door as it opens, or adjusting the threshold. A good carpenter watches the whole swing, not just the closed position.

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How much can you trim a door?

This is where old openings catch people out. Manufacturers set trimming limits, and they vary:

• Hollow core and moulded doors: often only around 3 to 6mm per edge, and some say not to trim the top at all. Cut further and you can hit the hollow core and weaken the door.
• Solid and lipped doors usually allow more, depending on the width of the lipping.
• Fire doors: only what the manufacturer's instructions allow, often around 3mm per edge, with gaps round the leaf typically 2 to 4mm. Planing a fire door heavily to suit an out-of-square frame can invalidate its fire rating.

Always check the door's data sheet before ordering. If the opening is well off a standard size, there are three better options than over-trimming: have a joiner make a door to measure, source a reclaimed door of the right size, or fit a new lining. For a period house, a made-to-measure or reclaimed panelled door often looks right where a modern door wouldn't. See carpenter vs joiner.

Keep or replace original doors?

Original panelled doors are often solid timber and can usually be repaired: loose joints reglued, splits filled, edges planed and hinges re-fixed. Stripping and repainting can transform them. Repair is often cheaper than expected and keeps the character of the house.

Replacement makes sense when a door is badly damaged or rotten, or must meet a standard such as fire resistance.

Rules and permissions to check

Listed buildings

Original doors and joinery can be part of a listed building's special interest, inside and out. Works that affect that character need listed building consent from the council, and carrying out such works without consent is a criminal offence, even if you didn't know the building was listed. Like-for-like repair often doesn't need consent, but removing or replacing historic doors usually does, so ask Harborough District Council before you start.

Conservation areas

In an unlisted house in a conservation area, internal doors aren't controlled by planning. Front doors can often be replaced under permitted development, but councils can remove that right with an Article 4 direction, so check with Harborough District Council whether one applies to your street.

Fire doors in loft conversions and three-storey houses

Approved Document B expects a protected escape route once a house has a floor more than 4.5m above ground, which a loft conversion on a typical two-storey house usually creates. Normally that means a protected stairway with fire doors (at least E20, the old FD20 rating) on the habitable rooms opening onto it, which often includes existing doors in an old house. Self-closers are generally not needed in a house. In a listed building, upgrading original doors for fire safety needs careful agreement between building control and the conservation officer, so involve both early.

Glazed external doors

Replacing an external door that is more than half glazed is controlled under the Building Regulations, so use an installer registered with a competent person scheme such as FENSA or Certass, or apply to building control.

The local angle

Harborough's planning documents note that older buildings in the east of the district are mostly ironstone, with brick increasingly used towards the west. The Market Harborough conservation area covers the town's historic core, and nearby villages such as Great Bowden (designated 1974) and Lubenham (designated 1975) have their own. In houses like these, expect some packing, planing and scribing on almost every door.

What it costs

Typical UK ranges from 2025/2026 cost guides, outside London:

Doors in old houses usually sit at the top of these ranges, because of the fitting involved. See the cost to fit internal doors, skirting board fitting cost (architrave and skirting are often done together) and carpenter day rates. Your actual price always comes from the carpenter's quote.

Our recommendation

When we renovated our house we learned that patience matters more than speed with old doors. If you'd like an introduction to the carpenter we use, message us. We're not paid for recommendations. We just pass you to people we trust. More on carpenters in Market Harborough.

Message us about a carpenterFree. We pass you straight to the tradesperson we trust.