How Much Masonry Paint Do I Need?

How We Calculated This

Masonry paint coverage depends on wall texture and porosity:

• Typical 3-bed semi front elevation: ~35m²
• Two side walls: ~30m²
• Deduct windows and doors: ~5m²
• Total paintable area: ~60m²
• Per coat: 60 ÷ 8 = ~7.5L
• Two coats: 7.5 × 2 = ~15L

Coverage by Surface Type

• Smooth render: 8–10m²/L
• Rough render / pebbledash: 4–6m²/L (texture absorbs more paint)
• Bare brick: 3–5m²/L (very porous, prime first)
• Previously painted render: 10–12m²/L

Typical House Sizes

• Mid-terrace (front only): 25–30m² = ~8L for 2 coats
• End-terrace (front + side): 40–50m² = ~12L for 2 coats
• Semi-detached (front + sides): 55–65m² = ~15L for 2 coats
• Detached (all 4 walls): 100–140m² = ~30L for 2 coats

Preparation

Wash walls with a fungicidal wash to remove algae and moss. Repair any cracks with exterior filler. Apply a stabilising solution to chalky or powdery surfaces. Use a masonry primer on bare render or brick before applying topcoats.

Tips

Choose a dry, overcast day between 10–25°C for best results. Avoid painting in direct sunlight as the paint dries too quickly and leaves brush marks. Use a long-pile roller (18mm+) for textured surfaces. Masonry paint typically lasts 10–15 years on smooth render with proper preparation.