Interior Decoration in Luxury London Renovation: Paint Specification, Preparation, and the Standards That Matter

Interior decoration is the last major trade to work in a renovated property and the one most directly visible to the client on handover day. It is also one of the most misunderstood in terms of what a genuinely high-quality finish requires — in surface preparation, in material specification, and in the time that cannot be compressed without compromising the result.

In a prime London renovation, the decorating contract typically covers: all internal walls and ceilings, all joinery (skirtings, architraves, doors and frames, built-in furniture), specialist finishes (colour washing, lime plaster, gilding, lacquering), and touch-ups and finishes after all other trades have completed. It is the last programme item before the client moves in, which means it is also the trade most exposed to programme pressure, snagging delays, and last-minute change requests. Managing the decorating phase well is what separates a project that ends cleanly from one that drags on in a succession of incomplete finishes.

Surface Preparation: Where Quality Is Won or Lost

The most important statement in interior decoration specification is this: the quality of the final finish is determined by the quality of the surface preparation, not by the quality of the paint.

A premium paint applied over a poorly prepared surface will show every imperfection. The same paint applied over a properly prepared surface will be invisible — a smooth, even plane of colour that makes the room's architectural proportions and detailing read clearly.

New plaster:

New plaster must be allowed to dry fully before painting — typically 4–6 weeks for a skim coat, longer for a full sand and cement base coat. Painting over wet plaster seals the surface and traps moisture, causing the paint to blister and peel. In programme-pressured renovations, this waiting period is the most commonly compromised step.

Once dry, new plaster is sealed with a mist coat (heavily diluted emulsion, typically 10–20% water added) that provides a base for subsequent coats without sealing the surface too aggressively. The mist coat will look uneven; this is correct. It is not a finish coat.

Existing plaster:

Existing plaster in a renovation will have areas of damage, previous filler repairs, nail holes, joint lines from removed fixtures, and potentially areas of blown plaster (where the plaster has separated from the substrate and sounds hollow). All blown areas must be cut out and repaired before decoration begins. All cracks must be opened, undercut, and filled with a compatible filler — not merely skim-filled across the surface.

The order of preparation work: fill, sand, prime, fill again, sand again, prime again. For a high-quality finish, this cycle may be repeated three or more times before the finish coats are applied. The best decorators spend more time on preparation than on painting.

Joinery:

New painted joinery (skirtings, architraves, door frames, doors) arrives on site either bare (if site-finished) or primed. The preparation sequence for a high-quality painted joinery finish: 1. Fill all nail holes, grain, and imperfections with a fine surface filler (Toupret or equivalent) 2. Sand with progressively finer abrasive (80, 120, 180 grit) 3. Apply oil-based primer undercoat (for oil-based top coats) or water-based primer (for water-based top coats) 4. Sand lightly, fill any remaining imperfections 5. Apply first finish coat; sand lightly between coats 6. Apply second finish coat; final light sand and polish if required

The number of coats varies with the quality standard required. Two finish coats is adequate for general residential work. Three finish coats — with light sanding between each — is the standard for the highest-quality painted joinery in a prime London interior. The difference in finish quality between two and three coats is apparent and worth the additional time.

Paint Specification: Sheen Level and Product

The choice of paint product and sheen level is a design decision as much as a technical one. The range of available products, particularly at the premium end of the market, is extensive, and the differences between them — in coverage, durability, pigment depth, and ease of application — are genuine.

Sheen levels:

*Flat/Matt*: No sheen; the most common finish for walls and ceilings in traditional London interiors. Hides surface imperfections well (the flat surface scatters light rather than reflecting it). Less washable than higher-sheen finishes; appropriate for formal rooms not subject to heavy use.

*Eggshell*: Low sheen; the workhorse finish for joinery in high-quality interiors. Washable, durable, provides a slight sheen that suits painted woodwork without being reflective. Available in both oil-based and water-based formulations.

*Satin*: Mid-sheen; appropriate for kitchens, bathrooms, and children's rooms where washability is prioritised. Can look overfinished in formal reception rooms.

*Gloss*: High sheen; traditional for external joinery (windows, doors) and some internal joinery applications in very traditional interiors. The highest-maintenance finish — every imperfection in the substrate reads in a high-gloss film.

Key manufacturers at the luxury end of the market:

*Farrow & Ball*: The most recognisable premium paint brand in the London residential market. Their Estate Emulsion and Estate Eggshell have a distinctive depth of colour achieved through high pigment loading and lime content. The chalk-based formulation absorbs and reflects light differently from standard emulsions. Expensive (approximately £60/2.5 litres) and less durable than harder finishes — but the quality of depth and the colour range are the market standard for traditional London interiors.

*Little Greene*: Historically accurate colour palette derived from period archives. High pigment content; less distinctive in surface quality than Farrow & Ball but more durable and available in a wider range of sheens.

*Papers & Paints*: A specialist supplier serving the conservation and period property market. Casein (milk) paints and distempers for traditional interiors and listed buildings; also a full range of modern emulsions.

*Edward Bulmer*: Natural pigments, linseed oil-based products, a colour range derived from period English interiors. The choice for clients who want genuinely traditional formulations.

*Mylands*: A Southwark-based manufacturer with strong trade credentials; good durability and colour range.

Oil-based vs. water-based eggshell for joinery:

The traditional specification for painted joinery was oil-based alkyd eggshell — durable, self-levelling, and achieving a finish quality that was until recently difficult to match with water-based alternatives. Environmental regulations have progressively reduced the permitted VOC content of oil-based paints, and the best water-based eggshells (Farrow & Ball Modern Eggshell, Little Greene Intelligent Eggshell) now closely match the quality of oil-based products for interior joinery. They dry faster (allowing multiple coats in a day), have lower odour, and clean up with water. For most interior joinery applications, water-based is now the correct specification.

Specialist Finishes

Specialist decorative finishes are a distinct skill set from standard emulsion and eggshell decoration, requiring dedicated craftspeople and longer programme allowances.

Lime plaster and limewash:

Traditional lime plaster finishes — applied as a final finish coat of lime putty or mature lime plaster — have a translucency and depth that no synthetic emulsion replicates. The surface is warm, slightly textured, and has a quality of light absorption that relates well to candlelight and warm artificial light. Appropriate in period properties and particularly effective in listed buildings where the use of breathable materials is both appropriate and sometimes a planning requirement.

Limewash — lime putty mixed with water and pigment, applied in multiple thin coats — is the traditional finish for lime plaster. It is available pre-mixed from specialist suppliers (Earthborn, Classidur, Kalk & Krita) and should be applied by a decorator familiar with the material's behaviour.

Colour washing and glazing:

Transparent or semi-transparent glaze coats applied over a base colour create depth and movement that a flat emulsion cannot achieve. Appropriate in rooms where a handmade, non-uniform finish is the design intent. More common in traditional interiors.

Gilding:

Applied gold (or silver, bronze, or aluminium) leaf on gesso grounds — used on picture frames, mirror frames, cornicing details, and furniture. A skilled craft that requires a dedicated gilder rather than a general decorator. Lead times and costs reflect the specialist nature of the work.

Programme Management

The decoration phase typically follows this sequence:

1. 1.First fix decoration (mist coat / primer on walls and ceilings; primer on joinery)
2. 2.Other trades complete second fix work (M&E fittings, joinery installation, stone and tile)
3. 3.Second fix decoration (second coats on walls; preparation and undercoats on joinery)
4. 4.Final trades complete (floor polishing, kitchen installation)
5. 5.Final decoration (finish coats; touching up around finally installed elements)

The critical coordination challenge is sequencing the decorator with the floor finisher. Stone floors are typically polished after decoration is nearly complete — paint drops on freshly polished stone require re-polishing. Timber floors are sanded, sealed, and finished as one of the last activities, after decoration but before furniture delivery. The protective sequence (cover floors while painting; paint before final floor finishing) must be agreed and managed actively.

Quality Assessment at Handover

Evaluating a decoration finish at handover requires the right conditions:

• —Assess in the room's actual lighting conditions — both natural daylight and artificial lighting at the planned intensity and direction
• —Use a raking light (torch or portable lamp held close to and parallel with the surface) to reveal surface irregularities that are invisible under standard lighting
• —Check joints between wall and ceiling, around door frames, at skirting lines: the neatness of these cut-in lines distinguishes a careful decorator from an average one
• —Check door frames and architraves for drips, sags, and brush marks in the final coat
• —Check the floor-skirting junction for any paint on the floor finish

At the highest quality levels, a decoration finish should show no visible brush marks, drips, or application lines in the finish coats. Joints should be knife-sharp. The surface should be uniformly flat in a raking light. These standards are achievable — they are the difference between a decorator who respects the craft and one who treats it as a production line.

Budget Framework

Decoration costs in a prime London renovation are primarily labour-driven:

These ranges reflect the quality tier of the decorator engaged and the specification of finishes — not simply the square meterage. A decorator working to a genuine high-end standard with premium materials will be at the upper end of these ranges; a decorator cutting preparation time will be at the lower end, and the result will show.