Yes, you can paint over existing exterior brickwork on your NZ home — and it's a popular way to refresh a tired facade or unify mismatched brick colours. However, once you paint brick it's very difficult to reverse, so it pays to go in with your eyes open and do the job properly from the start.
Think Before You Paint — It's a Long-Term Commitment
Painted brick requires ongoing maintenance. Moisture trapped behind paint can cause spalling (where the brick surface flakes away), efflorescence (white salt deposits), and peeling. In New Zealand's variable climate — from the humid north to the freeze-thaw cycles of the South Island — this is a real concern. Before you commit, consider whether a thorough clean and repoint might achieve the look you're after without the long-term upkeep of a painted finish.
Also check whether your home is a heritage or character property. Some local councils and Heritage New Zealand have restrictions on painting brick on listed or scheduled buildings. Check with your local council before starting.
Does This Work Require a Building Consent?
Painting existing brickwork is generally considered routine maintenance and does not require a building consent under Schedule 1 of the Building Act 2004. However, rules can vary — always confirm with your local council if you're unsure. You can find guidance on what work is exempt at MBIE Building Performance.
Step 1 — Inspect and Repair the Brickwork First
Before any paint goes on, the brickwork must be in sound condition:
- Check the mortar joints — cracked, crumbling, or missing mortar must be raked out and repointed. Painting over damaged mortar traps moisture and accelerates deterioration.
- Look for cracks — hairline cracks in bricks or mortar should be assessed. Structural cracking needs a professional eye before you proceed.
- Check for damp — if the wall is wet or shows signs of rising damp or water ingress, fix the source before painting. Paint is not a waterproofing solution.
- Treat any mould or lichen — use an appropriate fungicidal wash and allow the surface to dry fully.
If repointing is needed, this is skilled work. A qualified bricklayer will ensure the correct mortar mix is used — the wrong mix can actually damage older bricks. Find a local bricklayer on tradedirectory.co.nz.
Step 2 — Clean the Surface Thoroughly
Brick is porous and picks up years of grime, pollution, and biological growth. A thorough clean is non-negotiable:
- Pressure wash the entire surface and allow it to dry for at least 48–72 hours (longer in cooler or humid conditions).
- Remove any efflorescence with a stiff brush and, if needed, a diluted masonry cleaner.
- Remove any old flaking paint — a pressure washer often helps here, but stubborn areas may need scraping or a paint stripper suitable for masonry.
Step 3 — Choose the Right Primer and Paint
Using the correct products for masonry is critical in NZ's climate.
Primer
Always apply a masonry sealer or alkali-resistant primer before your topcoat. This stabilises the porous surface, improves adhesion, and helps prevent alkali burn-through from the mortar. Check with your paint supplier for a primer compatible with your chosen topcoat.
Topcoat
Look for a breathable, exterior masonry paint — sometimes called an elastomeric or texture coating. Breathability is key: it allows moisture vapour to escape from the wall while keeping liquid water out. Good options are available from Resene, Dulux, and Wattyl — all have dedicated exterior masonry ranges with technical data sheets to guide your selection.
| Product type | Best for | Notes |
|---|---|---|
| Alkali-resistant primer | All brick surfaces | Apply before any topcoat |
| Breathable masonry paint | General exterior brick | Allows moisture vapour out |
| Elastomeric coating | Cracked or textured surfaces | Bridges fine cracks |
| Texture/rough-cast paint | Rough or uneven brick | Thicker film, very durable |
Step 4 — Application Tips
- Apply paint on a dry, mild day — avoid painting in direct hot sun, high wind, or when rain is forecast within 24 hours.
- Use a thick-nap roller (18–20 mm) to work paint into the texture of the brick, and a brush to cut in around edges and work paint into mortar joints.
- Apply two full coats, allowing the recommended drying time between coats as per the manufacturer's data sheet.
- Don't thin the paint unless the manufacturer specifically advises it.
Colour Considerations
Dark colours absorb more heat and can increase thermal stress on the brick. In sunny NZ regions, lighter or mid-tone colours are generally a safer choice for longevity. Resene and Dulux both offer colour consultancy services if you'd like professional guidance.
When to Call a Professional
Consider engaging a qualified painter and decorator or bricklayer if:
- The brickwork has significant cracking, structural movement, or serious damp issues.
- Mortar joints need repointing across a large area.
- You're working at height above a single storey — scaffolding and working-at-height safety requirements under WorkSafe NZ guidelines apply.
- The property is heritage-listed or you're unsure about consent requirements.
A professional will also be able to advise whether painting is the right choice for your specific brick type and situation. You can find qualified local tradespeople on tradedirectory.co.nz.
Safety note: When working at height, always use appropriate scaffolding or a rated platform ladder. Never lean a ladder against unpainted or freshly painted brick without securing it properly.
Licensed Building Practitioner (LBP)
