Painting Exposed Brick in a Period London Home: Cleaning, Breathable Coatings, and When to Leave It Bare

Exposed brick in a Victorian or Edwardian home behaves differently from plaster, and that difference drives the whole specification. Old brick and the lime mortar between it hold and release moisture, so the coating has to work with that movement rather than seal it. Before any colour decision, the questions are: what condition is the brick in, what is behind it, and is painting genuinely the right route for this wall?

Start With the Wall, Not the Colour

Painting exposed brick is a substrate decision before it is a design decision. If the brickwork is sound, dry, and was meant to be seen, a coating can unify a chimney breast or a feature wall with the rest of the room. If the brick was originally hidden behind plaster or lining and has been exposed later, it may carry residual salts, old soot, or patchy mortar that no paint will disguise. In that case the specification is repair and stabilisation first, colour second. The honest assessment happens with the wall in front of you, in the room's actual light.

When Painted Brick Earns Its Place

Painted brick works when the wall is a deliberate feature and the brick itself is uneven, mixed, or damaged enough that bare brick reads as unfinished rather than characterful. Common situations in period London homes include a chimney breast where the brick colour clashes with the scheme, a recess or alcove where the brick was exposed during earlier works, and party-wall brickwork revealed by a later alteration. In each case, paint softens the variation while keeping the texture. Bare brick is usually the better choice when the brick is regular and attractive, when the mortar is in good condition, and when the room benefits from the warmth of the natural material. Once painted, returning to bare brick is a slow, abrasive job, so the decision deserves the same weight as choosing wallpaper.

Cleaning and Preparation: The Part That Decides the Finish

Preparation on exposed brick is slower than on plaster because the surface is three-dimensional. The work runs in this order:

• Remove loose dust and any flaking previous coating with stiff brushes, working from the top down so debris does not settle into freshly cleaned areas.
• Check the mortar joints. Where old lime mortar is crumbling or has been patched with cement, decide whether repointing comes before painting, because a coating will follow the joint and telegraph every repair.
• Look for white salt deposits (efflorescence). If salts are present and active, painting over them traps moisture behind the film and the coating will fail. The wall needs to dry and the salts need to stop appearing before coating begins.
• Test for existing coatings. A wall that has already been painted may carry a modern film that blocks moisture; a breathable coating applied on top will not perform as intended.
• Vacuum the fine dust from the pores of the brick. Paint bonded to dust sits on the surface rather than the substrate.

This stage is where most of the finish quality is actually decided. A coating applied over unclean brick will show every missed pore as a dull spot once the light rakes across the wall.

Choosing the Coating: Breathable Systems Come First

On old brick, the coating choice is between breathable mineral systems and modern films, and the breathable route is usually the right one for a period home. Limewash is the most sympathetic option: it penetrates the brick and mortar, moves with the wall, and develops the soft tonal variation that suits period interiors. Our limewash finishes page covers where this finish works best. Mineral paints offer a flatter, more uniform appearance while still allowing vapour movement, which suits walls that need a cleaner, more contemporary read. Standard modern emulsion sits on the surface as a film; on an old chimney breast that breathes, that film can trap moisture and eventually lift. The practical rule: the older and damper-prone the wall, the more the specification should lean towards lime-based or mineral systems.

Sheen, Colour, and How Brick Changes the Paint

Brick texture eats light, so a colour that reads mid-tone on a smooth plastered wall will read darker and denser on brick. Two adjustments matter. First, expect to test the colour on the actual wall and view it across a full day of light, because the raking light of a late afternoon shows the texture far more harshly than a morning. Second, keep the sheen flat. Any gloss on a textured surface highlights every ridge and pore; a dead-flat or very low-sheen finish lets the texture read as depth rather than roughness. Light colours on dark brick will need more coats to achieve coverage, and each coat must be worked into the surface rather than floated on top, which is why application on brick is slower and more physical than on plaster.

The Order of Work in an Occupied Room

Sequencing matters more on brick than on flat walls because preparation is dusty and the coating needs undisturbed drying time. A sensible order:

1. Protect floors, radiators, and joinery thoroughly; brick dust is fine and travels.
2. Complete cleaning, joint checks, and any stabilisation.
3. Apply the first coat thin, working it into the pores rather than loading it on.
4. Let the wall dry fully between coats; breathable coatings dry by both evaporation and carbonation, so rushing the interval compromises the finish.
5. Apply further coats until the coverage is even, checking under raking light.
6. Cut in cleanly to adjoining plaster, cornices, and skirting only after the brick coats are complete, so the boundary lines are made once, cleanly.

If the brick feature sits inside a larger redecoration, the brick work belongs early in the programme, while the room is still in its dusty phase, with the fine joinery and woodwork finishing afterwards.

Quality Checklist Before Handover

• Under raking light, no bare pores or dull patches remain where dust blocked adhesion.
• Mortar joints read as part of the wall, not as stripes of a different texture.
• No active salt deposits have reappeared at the edges or base of the wall.
• The colour matches the approved sample on the wall itself, not just on a card.
• Cut lines to plaster, cornice, and skirting are straight and unbroken.
• The room's surfaces and furnishings are free of brick dust and coating spatter.

Deciding Before You Commit

Painting exposed brick is one of those decisions that is expensive to reverse, so it is worth having the wall assessed before the colour is chosen. If you are weighing painted brick against bare brick, or against limewash on plaster elsewhere in the room, we can look at the wall with you and talk through the coating options as part of our painting and decorating work across London and Surrey.