Decorating After Building Work in London: Sequencing, New Plaster, and Making Good

When to Bring in the Decorator After a Renovation or Extension

One of the most common questions asked by London homeowners after a building project is: when can we start decorating? The answer is almost always later than you want it to be — and getting this sequencing wrong is one of the most reliable ways to spend money on decoration that fails within a year.

This guide addresses the key considerations for decorating after renovation work in London: what to wait for, how to handle new plaster, and how to sequence trades to protect the quality of the finished decoration.

The Sequencing Problem

Building work generates mess, moisture, and movement in ways that conflict with achieving a good decorative finish. The correct sequence is to ensure all structural, mechanical, and first fix work is complete before decoration starts — and to allow sufficient time for new materials to settle and dry before paint is applied.

The typical sequence for a renovation or extension in a London residential property runs: structural work, external weathertightness (roof, windows, external doors), first fix (plumbing, electrics, carpentry), plastering, second fix (joinery, skirting, architrave), then decoration. Attempting to decorate before second fix joinery is fitted means the decorator's work will be damaged during installation; attempting to decorate before plastering is cured means the paint system will fail.

However, phasing decoration work is sometimes practical and desirable. In a full house refurbishment, you may choose to decorate rooms progressively as they are completed, rather than waiting for the entire project to finish. This works provided each room is genuinely complete — all joinery fitted, all plasterwork dried — before the decorator moves in.

New Plaster: The Most Important Rule

New plaster — whether gypsum plaster, multi-finish, or bonding coat — must be fully cured before paint is applied. Applying standard emulsion directly to uncured plaster seals moisture into the wall, causes the paint to crack and peel as the plaster continues to dry, and wastes a significant portion of the budget.

The standard guidance is a minimum of four to six weeks drying time per 10mm of plaster depth, in a heated and ventilated building. In practice, a full London winter renovation with plastering done in December may still have rooms where the plaster is not paintable in January, even if four weeks have elapsed. The correct approach is to check with a moisture meter: new plaster should be below 12 percent moisture content before paint is applied.

The first coat on new plaster should be a mist coat: emulsion thinned with water (typically 20 to 30 percent water by volume) applied to the dry surface to seal and prime it without trapping moisture. This is not a cost-cutting exercise — it is a technical requirement. Skipping the mist coat and applying full-strength emulsion directly to new plaster, even dry plaster, risks poor adhesion and a patchy finish.

Making Good After Trades

Every trade that works in a room before the decorator leaves some remediation to do. Electricians chase cables into walls and patch; plumbers make good around pipe penetrations; joiners leave pin holes and minor gaps at architrave and skirting joints; builders fill structural openings. All of these repairs need to be assessed and finished properly before decoration.

Patches from different trades are rarely identical in surface texture and porosity to the surrounding material, which means they absorb primer and paint differently and can show through the finish as patches with slightly different sheen. Applying a coat of a diluted primer or stabilising solution to all repaired areas before full surface preparation helps to even out porosity and reduces patchiness in the finished coat.

Cracks at the junction between new and old plaster — where a plastered extension or converted loft meets existing structure — are almost inevitable. New materials move; old materials do not move in the same way; the junction between them cracks. These should be addressed with flexible decorator's caulk rather than rigid filler, which will crack again. Where movement is expected to be ongoing, lining paper bridging the junction helps to maintain the surface without continuous re-cracking.

Managing Dust and Protection

A renovation produces construction dust in quantities that contaminate painted surfaces if decoration follows too soon after. Fine dust settles on walls and ceilings and, if painted over, creates a rough, gritty texture in the finish and reduces adhesion. All surfaces should be wiped or brushed down before painting; in renovation contexts, a vacuum and wipe-down of all surfaces prior to the mist coat is standard practice.

Protect floors and any fitted elements that will not be decorated — kitchen units, sanitaryware, new radiators — before any painting begins. It is considerably cheaper to protect surfaces with dust sheets and masking tape than to clean overspray or drips from finished elements.

Working Around Drying Sealants and Adhesives

Adhesives used in tiling, flooring, and joinery installations emit solvents as they cure. Painting enclosed spaces — particularly bathrooms and kitchens — before adhesives and sealants are fully cured can produce a finish that smells, blisters, or fails adhesion. Allow a minimum of 48 to 72 hours after the last application of silicone sealant or tile adhesive before painting adjacent surfaces, and ventilate the space well.

When to Have the Conversation with Your Decorator

The best time to involve your decorator is during the building works programme, not after it is complete. A decorator who sees a job at survey stage — when walls are being replastered, joinery is being fitted — can advise on sequence, flag potential issues with the plaster drying schedule, and plan the decoration phase to run efficiently without costly revisits.

If you are managing a renovation in London and want professional decoration advice, contact us here early in the process. To get a quote based on your project scope, request a free quote and we will arrange a visit.