First Decoration of a New-Build Property: Getting It Right From the Start

Why New-Build Decoration Is a Specialist Job

There is a persistent misconception that new-build properties are the simplest interiors to decorate: the walls are flat, the surfaces are clean, and there's nothing to strip back. In practice, new-build interiors present specific technical challenges that catch out decorators who are used to working in period properties, and catch out homeowners who attempt to DIY the job shortly after moving in.

Getting the first decoration right is important not just for appearance: the way fresh plaster and plasterboard is handled in the first year has a significant bearing on how the surfaces perform for the next decade.

The Movement Window: When to Decorate

New plaster — whether the skim coat over blockwork or the skim over plasterboard — must fully carbonate and dry before painting. In a new-build apartment or house in London, this means waiting until the heating has been running for at least six to eight weeks, and ideally until the property has been through one full winter.

If you move in and decorate immediately, you risk:

• Paint cracking and crazing as the plaster continues to shrink and move
• Adhesion failure where moisture still in the plaster can't escape through an impermeable coating
• Nail pops in plasterboard ceilings — the board nails or screws work to the surface as the timber frame dries; these should all be treated and filled before the final coat goes on, not before the first

The practical advice: commission the decoration six months after completion, not six days after handover.

Mist Coats: The Non-Negotiable First Step

Fresh plaster is highly porous. Apply a standard vinyl emulsion directly from the tin and it will be absorbed unevenly, dry blotchy, and provide a poor key for subsequent coats. The correct first coat on any fresh plaster is a mist coat.

A mist coat is simply your chosen emulsion paint diluted with water: typically 20–30% water by volume. This thinner mix penetrates the plaster surface, seals it evenly, and provides a consistent key for the full-strength coats that follow.

Key points on mist coats:

• Use the same paint you'll be using for the finish coats — a diluted version of the same product, not a different product
• Apply by roller and cut in by brush; the thinner consistency means it runs easily, so work relatively quickly
• Allow the mist coat to dry fully (typically 4–6 hours) before assessing evenness; patch any blotchy areas before the next coat
• Do not skip the mist coat and apply two standard coats instead — this is a common shortcut that results in adhesion issues within months

Plasterboard Preparation

In new-build apartments particularly, a significant proportion of the wall and ceiling area may be plasterboard with a thin skim coat rather than traditional two-coat plaster over blockwork. Plasterboard skim is harder and less porous than base-coat plaster, but still benefits from a mist coat on first decoration. Additionally:

• Scrim tape over joins may show through a thin skim if it hasn't been well bedded. Sand any ridges back before painting and apply a thin skin of finishing plaster if the join is proud.
• Corner beads at external angles should be bedded flush with the skim; any protruding bead creates a line that will telegraph through multiple coats of paint.
• Inspect for shrinkage cracks at the junction of plasterboard and concrete or steel structural elements. Fill with a flexible decorator's caulk, not a rigid filler, as this junction will always have some movement.

Covering Developer White

The standard developer finish is almost universally brilliant white vinyl silk or Matt emulsion — applied in one coat over the skim, with minimal preparation. It looks acceptable at handover and shows up badly within months. Our approach:

1. Light sand all wall and ceiling surfaces to knock back any nibs or paint build-up
2. Wash down to remove any dust, grease or contamination from the building trades
3. Apply a mist coat in your chosen colour
4. Two full coats of finish — this is the minimum for a quality result

If the developer has used a vinyl silk throughout (as many do, since it's wipeable for the sales period), you may need to key the surface before misting: wipe down with a diluted sugar soap solution, allow to dry, then lightly sand with a 120-grit sanding pole before misting. This ensures adhesion on a surface that can be slightly glossy.

Choosing a Colour Scheme From Scratch

Moving into a completely blank, white-painted house is initially liberating and often quickly overwhelming. A practical framework:

• Start with the fixed elements: flooring (whether the developer's carpets or your own choice), kitchen worktops and cabinetry, bathroom tiles. These are the colours your walls have to work with.
• Test samples on every wall: light falls differently on north, south, east and west elevations, and a paint that looks warm and inviting in a south-facing sitting room can look flat and grey in a north-facing bedroom. Always test in situ.
• Create visual flow: in an open-plan apartment, consider using one base colour throughout the main living areas with accent variations in individual rooms. A completely different colour in every space can feel disjointed in a new-build layout.
• Don't rush white: if you are unsure, a warm white (Farrow & Ball 'All White' or Little Greene 'Loft White') is not the same as the developer's brilliant white and is a significant improvement. It gives you time to choose without living with a colour you might regret.

Talk to Us Before You Start

We've decorated numerous new-build apartments and houses in London and know how to avoid the common mistakes. Request a free quotation and we'll advise on timing, product specification and colour before a single brush goes on the wall.