Painting Garden Rooms in London: External Cladding and Interior Finishes

The Garden Room Revolution

The London garden room has evolved from a simple potting shed into a serious architectural addition. Across Chelsea, Islington, Clapham and Richmond, homeowners are installing purpose-built garden studios, home offices, artists' studios and guest annexes that are occupied year-round and expected to perform both functionally and aesthetically.

Unlike a house extension, the garden room sits detached in the garden — visible from the house, often from neighbouring properties, and exposed on all sides to London's weather. Its exterior finish is both a design statement and a weathering challenge; its interior finish must create a comfortable, productive environment in a relatively compact space.

Exterior Cladding: Reading the Material

Garden rooms arrive in a wide variety of external materials, each requiring different preparation and product selection.

Treated softwood timber cladding is the most common finish on standard garden rooms. The cladding is typically pressure-treated against rot but arrives with a green biocide colour that must weather or be overcoated before a final decorative finish is applied. A microporous wood stain or exterior wood paint applied in two to three coats is appropriate; oil-based products give excellent durability and a smooth finish, while water-based exterior stains allow faster recoating and easier clean-up on site.

Untreated hardwood cladding — iroko, western red cedar and similar — may be left to silver naturally or finished with a UV-inhibiting oil to preserve the timber's original colour. If clients wish to paint hardwood, adequate adhesion preparation is critical; the natural oils in dense hardwoods resist paint and require a specialist adhesion primer or a thorough denibbing before priming.

Composite and fibre cement cladding have become popular choices for contemporary garden room installations. Fibre cement boards — brands such as Cedral or Hardie Plank — arrive factory-primed and accept a wide range of exterior paint finishes without further preparation beyond ensuring the surface is clean and dry. Recoating is straightforward at the end of the factory primer's service life.

Larch or Douglas fir open-joint cladding in a charred finish (Shou Sugi Ban) is increasingly common on architect-designed garden rooms in areas such as Hampstead and Notting Hill. This finish is maintenance-free by design; the charred surface does not require painting and should not be painted. Where clients wish to refresh the char, wire brushing and re-oiling is the appropriate treatment.

Colour in the Garden Context

Exterior colour for a garden room is read against a very different backdrop from a house wall — not street, not other buildings, but planting, fencing, lawn and sky. This changes the rules considerably.

Dark colours — near-black, deep forest green, dark slate — are popular on garden rooms and work well for several reasons. They recede visually, allowing the garden itself to read foreground, and they pair effectively with the warm tones of timber decking, terracotta pots and mature planting. They also have a practical advantage: dark colours hide the soiling and staining that accumulate on any exterior surface in London's urban environment.

Pale colours can work beautifully but require more maintenance discipline — particularly on north-facing or shaded garden rooms where algae and moss growth is faster. A pale sage or a warm light grey on a south-facing garden room with good clearance from ground level and planting can remain fresh for years.

The relationship between the garden room exterior and the main house is worth considering. An exact colour match between house and garden room can create an overly corporate uniformity; a complementary but distinct colour — sharing the same undertone or value — tends to work better.

Interior Finishes: The Compact, Multi-Use Space

Garden room interiors present their own challenges. They are typically small — twelve to twenty square metres — which means colour errors are immediately apparent and there is little room for visual complexity. They are also often multi-functional, doubling as offices, studios, gyms or occasional guest sleeping spaces.

Light and space maximisation. In compact interiors, a consistent pale tone on walls, ceiling and any built-in joinery creates the illusion of more space than a contrasted scheme. This need not mean bland: a warm white — barely-there blush, very pale sage or soft oyster — gives character while preserving openness.

Acoustic considerations. Home offices and music studios sometimes receive acoustic treatment in addition to decoration. Acoustic panels — mineral wool boards faced in fabric — can be incorporated as wall features. Where painting over acoustic plasterboard (such as Knauf Cleaneo perforated board), a water-based emulsion applied by roller maintains the acoustic performance of the perforations; solvent-based products can block the perforations and compromise performance.

Joinery and built-ins. Garden rooms frequently include built-in desks, bookshelves and storage. These benefit from a harder finish than the walls — a satin or eggshell in a complementary but slightly stronger tone adds definition. Painting joinery and walls in identical colour and finish produces a flat, undifferentiated interior that often reads as unfinished.

Moisture management. Garden rooms are susceptible to condensation, particularly in autumn and winter. Anti-condensation paint on the coldest walls (typically the north-facing external wall) is a useful precaution; it will not replace adequate ventilation and insulation, but it reduces the risk of damp-related coating failure on the internal surfaces.

Our team carries out garden room painting projects across London's residential neighbourhoods. If you have a garden room or studio needing interior or exterior decoration, contact us for a survey and quotation.