How Much Does It Cost to Paint a Loft Conversion UK? (2026)

Published 25 August 2026 · Schneider Improvement Ltd., Glasgow

Painting a finished loft conversion in the UK in 2026 costs roughly £600–£1,000 for a typical 15–20 m² room, decorated properly from bare plaster. That is more than an identical bedroom downstairs, and the reason is simple: fresh plaster is a three-coat job, not a two-coat repaint.

This page is about painting only. If you are researching what the conversion itself costs to build, that is a £30,000–£50,000+ question and there are long guides elsewhere. What almost nobody tells you is what you still owe the decorator once the builder has gone — and whether any of it was in the quote you already signed.

The short answer, and where the number comes from

We do not have a proprietary loft price and we are not going to invent one. Here is every published figure we could verify at source, side by side, with what each one actually measures:

Notice what every one of those figures has in common: none of them is a loft. They are all existing rooms, already sealed, painted in two coats. We could not find a single UK source holding real data that publishes a price for painting a loft conversion specifically. So rather than pretend otherwise, here is the arithmetic, shown in full.

HaMuch says a double bedroom of 11.5 m² is “around two days”. A loft of 15–20 m² is bigger, and — per the manufacturers below — needs three coats instead of two, plus priming and finishing woodwork that is entirely bare. Call it 3–4 days. At HaMuch's tradesperson-reported £173/day average that is £519–£692 of labour; at the top of their range (£271, roughly London) it is £813–£1,084. Add £100–£250 of paint and you land at £600–£1,000 for most of the country.

That sits sensibly above the £350–£800 the same sources quote for an ordinary bedroom of similar size, which is exactly what the extra coat and the bare woodwork should do to the price. If a quote comes in below a normal bedroom repaint, ask which coats have been left out.

A note on day rates: you will also see around £325 a day quoted for painters. That is a different population (advertised rates on a lead-generation platform, which skew higher than what tradespeople report themselves). We keep those populations separate and never average them — averaging £170 and £325 produces a number that describes nobody.

Is the decorating already in your builder's quote?

This is the single most common way people get caught out, and it is worth five minutes before you budget anything.

Loft conversion quotes are usually sold at a “basic finish”. MyJobQuote defines that as walls plastered and woodwork primed. Read that again — primed is not painted. A primed skirting board is a grey-white undercoated skirting board that still needs its topcoats. So a “basic finish” loft typically leaves you paying for:

• The mist coat on every wall and ceiling
• Two finish coats on top of it
• Topcoats (satinwood, eggshell or gloss) on skirting, architrave and the door
• The Velux or roof-window reveals
• The eaves storage door, if you have one
• The new staircase and stairwell — see below

A shell conversion goes further still and excludes decoration outright, which is part of why it comes in materially cheaper. If you bought a shell, all of the above is definitely yours.

Ask your builder this, in writing: “Does the quote include a mist coat plus two topcoats to all walls and ceilings, and topcoats to all new woodwork — or is woodwork primed only?” The answer changes your budget by most of a thousand pounds. If you already have a quote and want to sanity-check the decorating line in it, our guide on whether a painting quote is fair shows how to reverse a price back into painter-days.

Why fresh plaster costs more: the mist coat

New plaster is porous and thirsty. Put normal emulsion straight onto it and the plaster sucks the moisture out of the paint film, which then sits on the surface without bonding — it peels, or comes away when you later pull off masking tape. The fix is a mist coat: emulsion thinned with water, applied first, which soaks in and seals the surface so the real paint has something to grip.

The cost consequence, which we could not find stated plainly anywhere:

This is not decorator folklore — it is the manufacturers' own instruction. Dulux Trade specifies sealing new or bare surfaces with a thinned first coat of Supermatt (up to 1 part clean water to 3 parts paint) “followed by the normal finishing process of 2 coats”. Crown Trade says the same thing with a different dilution: porous surfaces should be mist-coated with Contract Matt thinned with up to 40% clean water, then “apply two coats”. Trade folklore ranges from 5:1 to 50/50 — the two manufacturer figures are the ones to trust.

It changes your paint order too. Coverage figures are quoted per coat on a sealed surface — Dulux Trade Supermatt claims up to 18 m² per litre, Crown Contract Matt about 13 m²/litre (a 38% swing between two mainstream trade emulsions, so check the tin you are actually buying). For a new loft, budget area × 3 ÷ coverage, not × 2. At Wickes' 2026 price of £56 for 10 L of Dulux Trade Supermatt, the extra coat is cheap in materials — it is the extra day that costs you.

Timing matters as much as technique, and here the published advice genuinely conflicts. Homebuilding & Renovating says a freshly plastered wall should be left “at least a week” but “may need up to four weeks”; MyJobQuote's plasterer says at least a week; some sites insist on four to six. They cannot all be right, and the reconciliation is that the product changes the answer: Dulux markets Trade Supermatt as “particularly suitable for new plaster that is still drying out”, whereas a vinyl matt should not go on early.

Ignore the calendar and use the visual test instead — Homebuilding's is the clearest: the plaster goes from dark, patchy brown to a uniform pale pink. No dark patches anywhere, then mist coat. In a loft's favour, a thin skim over new plasterboard dries considerably faster than a thick float-and-set on masonry.

Sloped ceilings and Velux reveals: why loft m² lies

Every generic room calculator assumes a box: four vertical walls and a flat ceiling. A loft is not a box, and the error runs in a direction most people do not expect.

The coombed (sloping) sections mean your paintable surface is larger than the floor area implies, even while your usable floor is smaller because you cannot stand up at the edges. A 20 m² loft floor does not mean 20 m² of ceiling to paint. If you price a loft off floor area alone, you will under-buy paint and under-budget labour.

There is a second, subtler decision hiding in the slopes: where does the wall stop and the ceiling start? On a coombed room that boundary is arbitrary, and the practical answer most decorators reach is to treat the whole envelope as one surface in a single durable wall paint. That is a better-looking result, but it is more expensive per m² than using cheap contract ceiling emulsion overhead — and it is a choice you should make deliberately rather than discover on the invoice. Our guide to matt versus silk on walls and ceilings covers which finish survives where.

Access is the real cost driver, not height as such. HaMuch is explicit that a standard high ceiling “normally won't add any extra”, but that reaching the apex of a vaulted ceiling needs indoor scaffolding, which it expects to “add at least £100 onto the cost of painting a room, but it could be more”. A loft's geometry is the vaulted case, not the tall-room case.

Roof windows are the classic underestimate. A Velux sits at the bottom of a reveal as deep as the rafters. Instead of one flat frame you get a splayed opening with several returns plus a sloped sill, every edge cut in by hand. Calculators count that as “one window”. Price it as considerably more work than a vertical window — while noting the factory-finished sash itself often needs no paint at all.

Where we have to be honest: we could not find a single named UK source that publishes a decorator's price for a roof-window reveal, a dormer cheek, a coombed junction or an eaves storage door. Everyone prices “a room”. So we are not going to hand you a percentage uplift we cannot stand behind — we are telling you these are real, unpriced extras to raise with your decorator before they become a variation on the invoice.

The staircase nobody budgets for

Every loft conversion adds a staircase, and per square metre the stairwell is the most expensive painting on the entire job. The painter is working over a drop, which means a staircase ladder or a platform, slower movement and more setting up than actual rolling.

Then there is the knock-on that appears in nobody's quote: the new stairs eat into the floor below. A section of the existing landing gets rebuilt, re-plastered and reconfigured — so the landing you were not thinking about now needs patching and redecorating too, in a colour that has probably faded since it was last done. That cost sits outside “the loft” and outside the builder's decorating line.

There is a specific threshold worth knowing. MyJobQuote's staircase guide states that properties with “particularly complex or high stairwells, as well as any spanning more than two floors, should have professionally installed scaffolding”. A loft conversion is exactly what turns a two-storey stairwell into a three-storey one — so the sentence is describing your house the day the conversion completes. HaMuch, for its part, notes that stairwell work “may require additional equipment for working at height… this will naturally increase the price — in some cases quite significantly”, and puts a full hall, stairs and landing at around £800 on average.

Budget it separately from the loft room itself. Our hallway and stairs painting cost guide covers what stairwell access actually adds.

Fire doors: what you can and cannot paint

A loft conversion triggers fire safety requirements under the Building Regulations, which in most houses means fire doors on the stair enclosure. These can be decorated — but with one hard rule that is worth knowing before a decorator starts:

Do not paint over the intumescent strip. That is the seal set into the edge of the door or frame, and it works by expanding in heat to close the gap. Clogging it with paint compromises the thing it exists to do. Check the door manufacturer's instructions for permitted finishes as well, because decorating outside those instructions can affect the door's certification — a point that matters when you come to sell.

The VAT question almost everyone gets backwards

Most people assume decorating is always 20% VAT, or that VAT only matters if the decorator is big enough to be registered. Both can be wrong on a loft conversion, and the difference is real money.

Start with the simple part. A decorator whose taxable turnover is under the £90,000 VAT registration threshold (GOV.UK) cannot charge VAT at all. So a £700 quote from a sole trader and a £700 quote from a VAT-registered firm are not the same quote — one of them is about to become £840.

Now the part nobody writes about. HMRC's VAT Notice 708 (Buildings and construction) says at §7.6 that you can reduce-rate “any works of repair, maintenance (such as redecoration), or improvement… carried out to the fabric of the building during the conversion of the property”. Reduced rate means 5%, not 20% — and §13.8 puts “decorating materials” in the building-materials list, so the paint follows the same rate.

The catch is which conversions qualify. Per §7.3, a qualifying conversion changes the number of single household dwellings. So:

• An ordinary loft bedroom or en-suite for your own household — the number of dwellings is unchanged, so the decorating is standard-rated at 20%. This is most people.
• A loft turned into a separate self-contained flat — §3.2.5 states that where the new dwelling is contained within the existing building you cannot zero-rate it, but “you may be able to reduce rate your charge as a ‘changed number of dwellings conversion’”. That is the 5% route.
• A property empty for two or more years before work starts — a separate 5% route under §8, with the decorator needing evidence such as Council Tax or Electoral Roll records, or a letter from an Empty Property Officer.

One precise detail worth quoting back at anyone who argues: even inside a qualifying 5% job, §7.6 keeps “the erection and dismantling of scaffolding” at the standard rate. So the decorating can be 5% while the scaffold is still 20% on the same invoice. If you think you might qualify, get the decorator's VAT treatment confirmed in writing before work starts — they must hold the evidence, and it is far harder to fix afterwards. This is a summary, not tax advice; check Notice 708 or an accountant for your own case.

What moves the price

One more thing: come back for the snagging

A loft conversion is new timber and new board, and it moves. Through the first heating season you should expect hairline cracks at the plasterboard joints and where the coombs meet the walls. This is normal, not a defect. The practical implication is that the final decoration is best treated as having a small second visit built into it — and it is worth agreeing up front, while you still have leverage, whether the builder or you is covering first-year snagging touch-ups.

Related questions

How much does it cost to paint a loft conversion UK?

Roughly £600–£1,000 for a typical 15–20 m² room decorated from bare plaster in 2026 — MyJobQuote's £40–£50 per m² and the painter-day method (3–4 days at £165–£250) both arrive there.

Does my builder's loft conversion quote include painting?

Usually not. A “basic finish” means walls plastered and woodwork primed — the topcoats are still yours. A shell conversion excludes decorating entirely. Get it confirmed in writing.

Why does a loft cost more to paint than the same-size bedroom downstairs?

Fresh plaster needs a mist coat plus two topcoats (three coats, not two), sloped ceilings mean more paintable surface than the floor area suggests, and every piece of woodwork is bare rather than being refreshed.

How long should you wait before painting a new loft conversion?

Until the skim is genuinely dry — uniformly pale, no darker patches. A thin skim over plasterboard dries far quicker than the four-to-six weeks quoted for solid wet plaster, so ask your plasterer about your specific job rather than following a generic figure.

Do Velux and roof windows cost extra to paint?

Yes. The reveal is as deep as the rafters, with several returns and a sloped sill, all hand cut-in. Calculators count it as one window; price it as more.

Does the new loft staircase need decorating too?

Almost always, and it is the priciest area per m² because of working over a drop. The new stairs also disturb the landing below, which usually needs redecorating — a cost outside both the loft and the builder's quote.

Can you paint the fire doors in a loft conversion?

Yes, but never paint over the intumescent strip in the door or frame edge, and follow the manufacturer's permitted finishes — decorating outside those instructions can affect certification.

Sources & method. Day rates: HaMuch painter/decorator rates page (tradesperson-self-published: £173/day average, £127–£271 range, per-city figures) and Rated People (£100–£250 labour-only, £150–£400 with materials). Room benchmarks: HaMuch bedroom cost guide, MyJobQuote bedroom and loft conversion guides, Rated People. These are three different populations — tradesperson-posted rates, editorial quote guides, and lead-platform advertised rates — and we never average across them. Note that HaMuch's rates page (£173/day) and its own cost guide (£250–£400/day) disagree by roughly 2.3×, and MyJobQuote's staircase page contradicts its bedroom page; we have used the tradesperson-reported figures throughout and said so. Mist coat, dilution and coverage: Dulux Trade Supermatt product data and Crown Trade Contract Matt technical data sheet. Plaster drying: Homebuilding & Renovating. Paint price: Wickes, August 2026. VAT: GOV.UK VAT registration thresholds and HMRC VAT Notice 708 §§3.2.5, 7.3, 7.6, 8, 13.8. Checkatrade, MyBuilder and the FMB returned HTTP 403 to our fetch on 25 August 2026, so no claim is made about their figures — including the £325/day national average widely attributed to Checkatrade. We deliberately excluded one widely-copied “£280–£680 to paint a 15–20 m² loft” figure after tracing it to a site with no named author, no stated method and no underlying data. Prices are indicative UK 2026 figures, not a quotation.

More cost guides: painting a bungalow · painting a bedroom · hallway and stairs · a 3-bedroom house