How to Paint Exposed Brick Walls in London Homes

The Exposed Brick Decision

Exposed brick has become one of the most sought-after interior features in London homes. From warehouse conversions in Shoreditch and Bermondsey to stripped-back Victorian terraces in Brixton and Hackney, bare brickwork adds texture, warmth, and character that no paint finish can replicate. But exposed brick is not always in perfect condition, and homeowners frequently face a decision: leave it raw, seal it, limewash it, or paint it fully.

Each approach has distinct advantages and drawbacks, and the right choice depends on the condition of the brick, the age of the building, and the look you want to achieve.

Option One: Sealing the Brick

Sealing preserves the natural colour and texture of the brick while protecting it from dust and moisture. It is the least interventionist option and the easiest to reverse.

Best products for sealing:

• Ronseal Brick and Stone Sealer — a clear, matt finish that darkens the brick very slightly
• Zinsser Gardz — a water-based sealer that binds dusty surfaces without adding sheen
• Keim Fixativ — a mineral-based consolidant ideal for older, softer London stock brick

Pros:

• Retains the full character of the original brick
• Reduces dust from deteriorating mortar
• Fully reversible — does not change the brick permanently
• Breathable options available for older buildings

Cons:

• Does nothing to disguise staining, paint residue, or damaged bricks
• Mortar joints remain visible, including any repairs or repointing
• Limited colour impact — the brick looks essentially the same, just slightly richer

Sealing is the best choice when the brickwork is in good condition and you want to preserve its natural appearance.

Option Two: Limewashing the Brick

Limewash is a traditional treatment made from slaked lime and water, sometimes with natural pigments added. It creates a translucent, chalky coating that lets the brick texture show through while softening the colour.

Best products for limewashing:

• Bauwerk Limewash — available in a range of muted tones, easy to apply
• Kalklitir Limewash — Scandinavian-made, excellent coverage with a natural finish
• Traditional lime putty wash — made on site by mixing lime putty with water, the most authentic option

Pros:

• Creates a beautifully soft, aged appearance
• The brick texture remains visible through the wash
• Naturally breathable — ideal for older London properties with solid walls
• Builds character over time as it weathers and patinas
• Relatively easy to remove if you change your mind

Cons:

• Not fully opaque — stains and colour variations in the brick will show through
• Requires reapplication every few years as limewash naturally wears
• Not suitable for bricks previously sealed with a non-breathable product
• Application technique affects the final result significantly

Limewash is ideal for homeowners who want to lighten or soften their brick without concealing it entirely. It works particularly well on London yellow stock brick, adding warmth to what can otherwise be a rather austere surface.

Option Three: Full Paint Coverage

Painting brick with a standard masonry or interior paint provides complete coverage and unlimited colour choice. It is the most transformative option but also the most permanent.

Best products for full paint on brick:

• Zinsser BIN Primer (shellac-based) followed by a quality matt emulsion for interior walls
• Dulux Trade Weathershield for exterior-facing brick
• Farrow & Ball Estate Emulsion for a premium interior finish on properly primed brick

Pros:

• Complete colour control — any shade, any finish
• Hides staining, mismatched repairs, and unsightly mortar
• Creates a clean, uniform surface

Cons:

• Extremely difficult to reverse — paint removal from brick is labour-intensive and often damages the surface
• Traps moisture in solid-walled buildings, potentially causing damp issues
• Obscures the natural texture and character of the brick permanently
• Requires ongoing maintenance — painted brick shows chips and wear more readily than raw brick

Full paint coverage should be considered carefully, particularly in pre-1920s London buildings with solid walls. These properties rely on breathability to manage moisture, and a non-breathable paint film can redirect damp inward, causing problems with plaster, timber, and indoor air quality.

Preparation Is Everything

Regardless of which approach you choose, preparation determines the result:

1. Clean the brick thoroughly — remove loose dust, mortar fragments, and any previous coatings with a stiff brush and vacuum
2. Treat efflorescence — white salt deposits on brick must be brushed off dry; do not wet them, as this drives the salts back into the brick
3. Repair mortar joints — repoint any crumbling mortar before sealing or painting; use a lime mortar on pre-1920s buildings, not cement
4. Test for damp — if the wall is damp, address the moisture source before applying any coating; painting over damp brick guarantees failure

A Note on London Stock Brick

London's signature yellow stock brick is softer and more porous than engineering brick or modern flettons. It absorbs coatings unevenly, which makes limewash application particularly characterful but full paint coverage more challenging. Always apply a dedicated primer on stock brick before painting — Zinsser BIN or a PVA-based stabilising solution helps even out absorption and prevents patchiness.

Making Your Decision

The condition and character of your specific brickwork should drive the decision. Beautiful, well-pointed stock brick in a Kennington terrace deserves sealing at most. Stained and patched brick in a Clerkenwell conversion might benefit from limewash to soften its imperfections. Only reach for full paint when the brick is genuinely unsightly or when the design demands a specific colour that brick cannot provide naturally.

Whichever route you take, the treatment should respect the age and construction of the building. In London's older housing stock, breathability is not optional — it is structural.