Painting Outbuildings in London: Garden Studios, Store Rooms and Brick Render Systems
How to paint and maintain London garden outbuildings — from traditional brick store rooms and rendered outhouses to converted coach houses and garden studios.
London Outbuildings: A Varied Brief
London gardens contain a remarkable variety of outbuildings — some dating to the Victorian period, others recently erected as garden studios or home offices. The brief for painting them varies accordingly: a rendered Victorian outhouse at the foot of a Pimlico garden requires very different treatment from a modern timber-clad garden studio in Islington or a converted laundry room in a Chelsea basement yard.
What they share is the need for durable exterior finishes that can withstand London's urban damp, pollution and temperature variation, and — increasingly — interior decoration suited to year-round habitation rather than occasional storage.
Assessing the Structure Before Specifying
The most common and most expensive mistake made when repainting an outbuilding is applying new paint to a surface that has not been properly assessed. Old outbuildings in particular are prone to:
Damp ingress through the roof. A failing felt or slate roof on a Victorian outbuilding means that interior plaster and walls will be damp. Painting damp walls produces paint failure within months. The roof must be repaired before any interior decoration begins.
Efflorescence on brick and render. White crystalline deposits on exterior masonry indicate salts migrating from within the wall. These must be brushed off and the cause investigated before painting; sealing over active efflorescence traps the salts and causes the coating to bubble and lift.
Hollow or cracked render. Sound render rings solid when tapped; hollow areas produce a drum-like resonance. Hollow sections must be cut out and re-rendered before painting — overcoating hollow render results in the new paint peeling as the hollow sections eventually fail and detach.
Failing original paint. If the existing exterior coating shows crazing, flaking, or wide cracks — rather than the hairline surface cracks that can be treated and overcoated — full removal to bare masonry is warranted before a new coating system is applied.
Exterior Systems for Brick Outbuildings
Where the original structure is London stock brick, clients often face the choice between retaining the brick as a feature or painting over it.
Painting stock brick is a legitimate and long-established practice in London. The key requirement is that the paint must breathe — polymer-sealed coatings that prevent moisture vapour movement through the brick can cause spalling and mortar deterioration. Breathable mineral masonry paint (silicate-based products such as Keim or Beeck are the premium options; Dulux Weathershield Masonry and similar are more affordable alternatives) allows the wall to breathe while providing weather resistance and colour.
Limewash on older outbuildings with lime mortar joints is a historically appropriate choice that is also technically superior to modern masonry paint in this application: it is fully breathable, self-sealing (it carbonates as it dries) and gives an attractive chalky finish that suits period London properties. It requires recoating more frequently than modern masonry paint but is easier to apply and repair.
Rendered outbuildings are typically finished with a smooth or scraped texture. Sound render can be overcoated with a quality masonry paint in two coats, the first diluted slightly for better penetration into the surface. Damaged render requires repair, priming with a stabilising primer, and then the full coat system.
Timber and Contemporary Outbuildings
Newer outbuildings in timber or composite cladding require different product selection. The key principles:
Timber cladding should be prepared by removing any loose or peeling previous treatment, lightly sanding to remove weathering grey on bare timber, and cleaning to remove algae and mould before applying a new microporous stain or exterior wood paint. Annual inspection and touching-up of any areas that show paint movement or cracking keeps the system performing well between major redecoration cycles every four to six years.
Metal-clad structures — corrugated steel, zinc or aluminium — require degreasing, a metal primer and a direct-to-metal topcoat. The corrugated profile makes brush application the most reliable method; spray application is faster but introduces significant overspray risk in a garden setting with plants and neighbouring property nearby.
Interior Decoration for Garden Studios
Where outbuildings are converted and used as studios, home offices, gyms or playrooms, interior decoration becomes as important as the exterior shell. Key considerations:
Moisture management. Outbuildings that were previously unheated will have absorbed significant moisture over time. Running a dehumidifier for several weeks before decorating, checking walls for residual dampness with a moisture meter and applying a damp-resistant primer where readings are elevated is essential to prevent future coating failure.
Insulation and condensation. A poorly insulated outbuilding will suffer from condensation on cold external walls. Anti-condensation paint — a heavily filled product that moderates the surface temperature of walls and ceilings — is a practical addition to the specification where full structural insulation is not feasible.
Colour in a compact space. Most London garden outbuildings are small, and interior colour choices should account for this. Pale tones on walls and ceilings preserve the sense of space; a single feature wall or the external-facing wall in a slightly stronger tone gives character without reducing the room.
Our team works on outbuilding projects across London's residential areas, from Victorian laundry buildings in Belgravia to modern garden studios in Hackney and Wandsworth. Contact us for a survey and quotation.