Skirting and architrave sizes by ceiling height

At a glance

Skirting height in millimetres from finished floor, worked out by us from each rule and rounded to 5 mm. These are conventions, not standards: they disagree, and none cites a primary source.

There is no standard to look up

We found no British Standard or building regulation that sets the height of a skirting or the width of an architrave. BS 1186-3, the standard for wood trim, was not read, so we cannot say what it covers. The figures that circulate come from suppliers and decorating guides, and none of the pages we read cites a source for them.

That matters because the rules do not agree. At a 2.4 m ceiling they give anything from about 60 mm to 170 mm; at 3.0 m, from about 75 mm to 210 mm. The table above shows each rule worked out; treat the result as a range to choose from, not an answer. The profile, the floor finish, the period of the building and the look wanted will decide more than any ratio.

The rules drawn to scale

The ratio rules scale with the ceiling, so one ceiling shows how they sit against each other. The drawing takes a 2,700 mm ceiling and magnifies the lowest 300 mm, with a skirting standing at the height each rule gives. For another ceiling height, read the table.

Skirting and architrave together

The sources conflict on how the two should relate. One supplier advises that the skirting should be taller than the architrave is wide, but not dramatically. Other guidance says the architrave is usually the thicker of the two so that the skirting butts to it, or that a plinth block is used where they meet; and a further view is that plain skirting with a substantial architrave is the most common pairing. Higher ceilings are generally said to call for taller skirting and a wider architrave. These are three conventions, and all three work if they are drawn deliberately.

Whichever is chosen, show the junction in elevation on the drawing. It is the detail most often left to the joiner's judgement on site.

Where the skirting meets the floor

Heights are measured from the finished floor, so the floor build-up changes the answer: carpet, a floating timber floor, stone or underfloor heating can each change where the bottom of the skirting sits. A timber floor needs a gap at the wall that the skirting has to cover, and the skirting is normally scribed to the floor. We give no figures for either because we have no source for them; ask the flooring contractor for the gap and the finished thickness, then add them to the schedule.

Fire classification in England

In England, Approved Document B leaves skirtings, architraves, cover moulds, picture rails and similar narrow members out of what counts as a wall lining for reaction to fire (Volume 1 paragraph 4.3; Volume 2 paragraph 6.3; 2019 edition incorporating the 2020, 2022, 2025 and 2026 amendments, as published on GOV.UK in November 2026). The wall behind them is still a lining, and the project fire strategy and building control decide. Scotland, Wales and Northern Ireland have their own guidance, which this sheet does not cover.

Fixing a size so it is not guessed

• Pick the size, then draw it. Treat the table as a range, pick a height, and put it on a 1:1 section with the profile, the projection and the height to the top of the skirting.
• Mock up one room. Fix a length of skirting and architrave in the real room before production. The ratio looks different with the real floor, door and light.
• Say which size you mean. State whether sizes are finished or nominal, and measure from the finished floor.
• Match period rooms from the room. In an older building, use surviving mouldings, paint lines or marks on the wall as the evidence for the original height, rather than a published range.

We coordinate the drawing and the mock-up with the partner workshop that will make the trim, before the schedule is fixed. The profile names are on our moulding profiles sheet (TL-JOI-01).

Ref [S-01]: skirting, profile as detail [D-12] at 1:1, [150] mm high from finished floor level to the top of the skirting, [22] mm projection. Material [ ]. Finish [ ]. Scribed to the floor; floor finish thickness and gap to be confirmed on site. Height to be confirmed on a mock-up in [room] before production.

Ref [A-01]: architrave, profile as detail [D-13] at 1:1, [90 x 20] mm finished, with [plinth blocks / skirting butting to the architrave]. Reveal from lining [ ] mm. Head mitred. Finish [ ].

Sizes in this schedule are set by the designer and shown on the drawings. No proportion rule (such as a fraction of the ceiling height) is to be applied by the workshop in place of a drawn size.

Standards and sources

• Approved Document B Volumes 1 and 2 (England), 2019 edition with amendments to 2026: Volume 1 paragraph 4.3; Volume 2 paragraph 6.3. Read November 2026.
• BS 1186-3, wood trim and its fixing: named only; not read. No size rule is claimed from it.
• Wikipedia: Molding (decorative): definition of skirting (baseboard).
• Designing Buildings: Architrave: definition.

Questions we are asked

What height should skirting be for a 2.4 m ceiling?

No standard sets it. The rules of thumb in circulation give anything from about 60 mm to 170 mm at 2.4 m; one twentieth of the ceiling height, which is 120 mm, is one of them. The profile, the period of the building and the floor finish matter more than the ratio, so choose a height and confirm it on a mock-up.

Is there a rule for skirting height by ceiling height?

There are several and they disagree: one twentieth, one fifteenth and two percentage ranges are among those we found. None of the pages we read cites a primary source, so treat them as conventions and fix the size on a drawing.

Should skirting be taller than the architrave is wide?

One supplier says it should be, but not dramatically. Other guidance says the architrave is usually the thicker of the two, or that a plinth block is used where they meet. These are conventions; choose one and draw the junction.

Do the Building Regulations set a size for skirting or architrave?

We found no standard or regulation that does. Approved Document B in England only treats skirtings, architraves and similar narrow members as outside the wall and ceiling lining classifications (Volume 1 paragraph 4.3, Volume 2 paragraph 6.3; 2019 edition with amendments to 2026). The wall behind is still a lining.

How do I choose skirting height in a period house?

Look for the surviving height: original mouldings, paint lines or marks on the wall. Published period ranges are summaries from suppliers, not records, so match what is in the building and draw it.