Painting a London Penthouse: High-Spec Finishes, Roof Terraces & Large Glazing

Penthouse Projects: The Pinnacle of London Residential Decoration

A London penthouse represents the top of the residential decorating market in every sense. These properties — whether in converted period buildings in Mayfair and Chelsea, purpose-built towers overlooking the Thames, or the newer super-prime developments of Nine Elms and White City — demand the highest level of skill, the most carefully specified products, and the kind of professional conduct that matches the environment.

We work on penthouse apartments regularly, and the experience has taught us that the challenges here are distinct from those found anywhere else in the residential decorating world.

The Interior: Scale, Light, and Specification

Large Volumes and Tall Ceilings

Penthouse interiors are often characterised by exceptional ceiling heights — four, five, or even six metres in the grandest conversions — combined with open-plan living spaces of a scale rarely found outside commercial buildings. This amplifies every aspect of the decorating challenge: any imperfection in surface preparation is visible at a distance; any inconsistency in colour or sheen becomes obvious across a large expanse of wall.

We treat these surfaces with the same attention to preparation that we give to listed building interiors — flat, filled, primed, and checked under raking light before any finish coat goes on.

Working with Interior Designers

Penthouse projects at this level are almost always delivered in conjunction with an interior designer. This is a collaborative relationship we understand well and genuinely value. The designer brings a vision; our job is to execute it with precision, flag any practical concerns with the specified products or finishes before work begins, and maintain clear communication throughout.

When a designer specifies a bespoke RAL or NCS colour — common in high-end penthouse projects — we arrange precise colour matching and produce test panels for sign-off before committing to full walls. We never proceed to finish coats without approval of colour and sheen level on a representative surface.

Textured and Specialist Finishes

Venetian plaster, tadelakt, microcement, limewash, and burnished plaster finishes are increasingly specified in luxury London penthouses. These are skills that go beyond standard paint application — they require training, experience with the specific product systems, and in some cases specialist subcontractors working under our management.

We have established working relationships with specialist plaster artisans and can co-ordinate their input within our broader decorating programme. If a designer is specifying any of these finishes for the first time, we are happy to discuss what is realistic in terms of cost, timescale, and the substrate conditions required.

High-Gloss Feature Areas

High-gloss lacquered finishes on walls — applied over multiple coats of tinted primer with intermediate sanding between coats — create a mirror-smooth surface that is a signature of very high-end London interiors. The preparation required is extraordinary: any ripple, bump, or imperfection in the underlying substrate will be magnified by the reflective finish.

We achieve true high-gloss wall finishes through a combination of skim coating by a specialist plasterer, multiple coats of specialist undercoat, wet-and-dry sanding between coats, and a final topcoat of a two-part polyurethane or a specialist interior lacquer. The result is a finish indistinguishable from sprayed automotive lacquer — and the process takes as long as that comparison suggests.

Roof Terraces: Exterior Challenges at Height

The roof terrace is one of the defining features of a penthouse, and it brings exterior decorating challenges that require careful thought.

Metalwork: Railings, Balustrades, and Structures

Roof terrace railings, balustrades, and structural metalwork are exposed to weather conditions that are more severe at height than at street level. Wind-driven rain, UV exposure, and temperature fluctuation all accelerate paint degradation. The specification for metalwork at this level should be:

Mechanical preparation: abrasive disc or wire brush to remove any loose material, rust, or failing previous coating
Chemical treatment: rust converter on any areas of active corrosion
Two-pack epoxy zinc phosphate primer: provides genuine corrosion inhibition, far superior to single-pack alkyd primers on exposed metalwork
Polyurethane topcoat in the specified colour and sheen — more UV-resistant and flexible than conventional oil-based gloss

Products we use: Jotun Hardtop or Dulux Trade Weathershield Extra Durable Gloss for topcoats on exposed penthouse metalwork.

Decking and Floor Surfaces

Hardwood decking on roof terraces is often painted or stained, and the finish here needs to be both slip-resistant and extremely durable. Specialist decking oils with UV inhibitors — Osmo UV-Protection Oil or Ronseal Hardwood Decking Oil — provide far better performance than standard floor paints on timber decking exposed to full weather.

Where composite decking or concrete paving is the substrate, a specialist floor paint with anti-slip aggregate provides a durable, safe finish.

Weatherproof External Walls

External walls of penthouse extensions and rooftop structures are often in rendered blockwork or insulated render systems. These need a breathable, elastomeric masonry coating — Parex, K Rend, or a silicate-based system — that can accommodate minor thermal movement without cracking. Standard masonry emulsions are not adequate for rooftop environments.

Large Glazing: The Elephant in the Room

Penthouse apartments almost universally feature expansive glazing — full-height windows, roof lights, glazed sliding door systems. From a decorating perspective, large windows create a specific challenge: the quality of natural light flooding into the space reveals every imperfection in surrounding decoration that artificial light would conceal.

We always check decorating quality in penthouse interiors under both artificial and full natural light before signing off. A subtle sheen difference between adjacent wall areas, a brush mark in a cornice, or a barely-there texture in a ceiling finish — invisible under a lamp — can become a noticeable defect in full daylight. This final check is non-negotiable on projects of this specification.

Frames and Reveals

The painted window frames and reveals in a penthouse are typically specified to a very high standard — either in a precise tinted colour matched to the overall scheme, or in a contrasting white that frames the view. These are often aluminium or steel sections, requiring a specialist bonding primer before any topcoat — paint simply will not adhere reliably to aluminium without the correct primer system.

Logistics of Working in a London Penthouse

Penthouses present their own logistical challenges beyond the technical. Lifts, particularly in older converted buildings, may not carry full scaffolding towers, requiring disassembly and reassembly at each floor. Materials deliveries need to be planned carefully with building management. And the standard expectations of penthouse clients — both in terms of the quality of the work and the discretion and professionalism of the team — are high.

We bring clean-operatives who understand how to work in premium environments: shoe covers as standard, careful protection of floors and furniture, no radio, and a site left cleaner than it was found at the end of every working day.

If you are planning the decoration of a penthouse apartment in London, we would be very pleased to discuss your project.