Interior finishes are what turn a shell of a house into a finished home — and the cost range across the category is enormous. Skimming a single ceiling costs as little as £150, while a bespoke oak staircase or a run of built-in joinery can run past £10,000. In 2026, UK homeowners are spending anywhere from a few pounds a metre on architrave and skirting to £15,000+ on a full staircase replacement, depending on material and specification.
This guide brings our interior finishes library together in one place — walls and plaster, mouldings and trim, internal doors and fire safety, staircases and balustrades, built-in storage, and the fixings and final-fix details that hold a finish together.
Walls & Plaster
Plaster and plasterboard are the base layer behind almost everything else in this guide. Plasterboard types and sizes explains when to specify standard, fire-rated, moisture-resistant or acoustic board — most sheets cost £5–£25 depending on type. Skimming that board is a separate job and a separate cost: ceiling plastering cost covers the £150–£300 skim-only price against £300–£600 for a full board-and-skim re-plaster. Where noise between rooms is the real problem rather than the finish itself, soundproofing a room covers the mass and decoupling techniques that go on before the final plaster coat, at £400–£2,500 DIY or £1,500–£8,000+ professionally installed.
Mouldings & Trim
Skirting, architrave and coving are usually the last things fitted before decoration — and the easiest place to mismatch a period property’s proportions. Skirting board types and cost compares MDF against solid timber at £1–£8 per linear metre in materials, plus £150–£300 per room in labour. Architrave should always match or complement it: architrave and skirting profiles walks through torus, ogee and chamfered options from £0.80–£8/m. Ceilings get the equivalent treatment in coving and cornice cost and fitting, typically £200–£600 per room all-in, and where the existing coving is original rather than new, repairing Victorian coving covers patching small cracks for a few pounds versus £80–£200 per metre for a cast replacement section.
Internal Doors & Fire Safety
Doors are both a finish and a safety element. Internal door types and how to choose compares hollow-core flush doors from around £30 with solid hardwood panelled doors at £400+. Getting the opening right matters just as much: standard internal door sizes sets out the six standard UK widths and the 775mm minimum clear opening required for accessible routes under Part M. Door linings and frames explains the difference between the two and why specifying the correct lining width for your wall thickness avoids costly on-site alterations, and anywhere fire compartmentation applies — a garage, a flat’s escape route, a three-storey house — FD30 and FD60 fire doors sets out which rating applies where.
Staircases & Balustrades
A staircase is one of the highest-value single joinery items in a house. Staircase types and costs compares straight flights from £1,500–£3,500 against winders at £2,500–£5,000 and spirals at £2,000–£8,000. If yours is structurally sound but tired, staircase renovation cost covers refurbishing treads, spindles and handrail for £1,500–£4,500 rather than the £3,000–£15,000 a full replacement can reach. Short on floor space specifically, spiral staircase sizes and Building Regs covers the 1,500mm minimum compliant diameter and £2,000–£10,000+ price range. Whatever the stair type, newel posts, spindles and balustrades covers the £800–£2,000 softwood balustrade against £3,000–£8,000+ oak or glass upgrades, and the 900mm/1,100mm minimum handrail heights Building Regs require.
Built-in Storage & Joinery Materials
Alcoves either side of a chimney breast are the most common built-in storage opportunity in a UK home. Alcove cupboard cost and ideas compares £400–£900 flatpack units with £900–£2,500+ bespoke carpentry. Doing it yourself is realistic for a competent DIYer: how to build an alcove cupboard and shelves covers a materials-only build for £80–£250 over a weekend. Whichever route you take, the underlying material choice matters — MDF vs solid timber for joinery explains why MDF is cheaper and more stable for painted work, at £25–£45 a sheet against £4–£8 per linear metre for comparable softwood, but cannot go anywhere damp without a moisture-resistant grade.
Fixings, Adhesives & Final Fix
None of the above stays up without the right fixing. Wall plugs and anchors explains matching the plug to brick, block, plasterboard or stud at £3–£6 per 100, and screws and fixings covers thread, drive and material choice from £2–£5 per 200. For bonding rather than mechanical fixing, grab adhesive runs £3–£10 a tube, silicone vs acrylic sealant explains which of the £3–£12 tubes suits a wet room versus a skirting gap, and tile adhesive and grout covers standard and rapid-set mixes from £8–£25 per 20kg bag. The last jobs before a room is finished are usually electrical: LED downlights covers spacing and the fire-rated fittings required beneath a converted loft, at £8–£60 per fitting, and sockets and switches sets out the standard 450mm/1,200mm heights and £80–£180 per outlet fitted cost.
| Element | Typical Cost (2026) |
|---|---|
| Ceiling skim / re-plaster | £150 – £600 per room |
| Skirting board (supply + fit) | £1–£8/m + £150–£300/room labour |
| Coving / cornice | £200 – £600 per room |
| Architrave | £0.80 – £8 per linear metre |
| Internal door (supply only) | £30 – £400+ |
| New staircase (fitted) | £1,500 – £8,000 |
| Staircase renovation | £1,500 – £4,500 |
| Alcove cupboard (bespoke) | £900 – £2,500+ |
[!tip] Sequence Your Finishes in the Right Order Plaster and board first, then let it dry out fully before fitting skirting, architrave and coving — moisture from wet plaster will bow MDF and open up mitre joints within weeks. Hang doors and fit sockets and switches last, after decoration, so the trim isn’t marked during painting.
Where to Start
If you’re planning a full room refit, start with ceiling plastering cost to budget the base layer correctly, then move on to skirting board types and cost for the trim that ties the room together. Replacing a tired staircase is usually the single biggest-ticket item in this guide — staircase renovation cost is the fastest way to see whether a refurbish or a full replacement makes more sense for your budget.
