How many bricks per square metre for a boundary wall?

A half-brick wall (single skin, 102.5mm thick) uses approximately 60 bricks per square metre. A one-brick wall (double skin, 215mm thick) uses approximately 120 bricks per square metre. These figures assume standard UK bricks (215×102.5×65mm) with 10mm mortar joints and include a small allowance for cuts.

Do I need piers in a brick boundary wall?

Yes, piers are structurally necessary. For a half-brick wall, piers should be spaced at a maximum of 3m centres. For a one-brick wall, pier spacing can be up to 4m. Piers should also be placed at each end of the wall, at changes of direction, and either side of gates. They increase the lateral stability of the wall against wind loading.

What foundation depth is needed for a brick boundary wall?

The minimum foundation depth for a boundary wall is 450mm below finished ground level. For walls over 1.2m high, the foundation should be at least 600mm deep. The concrete strip should be at least 200mm wider than the wall on each side. Use C20 mix concrete (1:2:4 cement:sand:aggregate) for the foundation.

Do I need planning permission for a brick boundary wall?

In England, walls up to 2m high generally don't need planning permission unless adjacent to a highway (where the limit is 1m). Listed buildings and conservation areas may have stricter rules. Walls over 2m always require planning permission. Building Regulations may also apply to walls over 1.2m high for structural stability.

What mortar mix should I use for a boundary wall?

Use a 1:5 or 1:6 (cement:soft sand) mix for most boundary walls above ground, or 1:4 for exposed locations. Below the DPC (damp-proof course), use 1:3 cement:sand or add a waterproofer. Pre-mixed mortar in 25kg bags is convenient for smaller jobs — typically one bag lays approximately 50-55 bricks.

TradeCalculator

Brick Boundary Wall Calculator

Calculate bricks, piers, coping stones, mortar and foundation concrete for brick boundary walls. Half-brick or one-brick construction.

Wall Length

Total boundary wall length

Wall Height

Max 2m without planning (1m at highway)

Wall Type

Half-brick for walls up to 1.2m; one-brick for taller

Coping Type

Protects wall top from water ingress

Include piers

Structural piers at regular intervals

Price Per Brick (optional)

Your supplier's price per brick

Price Per Coping (optional)

How We Calculate This

This calculator works out the bricks, piers, coping stones, mortar and foundation concrete for a brick boundary wall. It accounts for wall type (half-brick or one-brick) and pier requirements for structural stability.

The formula

Bricks = Wall area (m²) × Bricks per m² (60 or 120)
Piers = Wall length ÷ Pier spacing + 1
Pier bricks = Piers × Courses high × Extra bricks per course
Foundation = Length × Width × Depth

For a 10m × 1.8m half-brick wall with piers at 3m: ~1,080 wall bricks + ~384 pier bricks = ~1,464 total bricks, plus 45 coping stones and ~0.9 m³ of foundation concrete.

Construction guide

Set out string lines and profiles for accurate alignment
Build from corners and piers inwards, using gauge rods
Include a DPC at least 150mm above finished ground level
Point joints while mortar is still green (thumb-firm)

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates. Verify with your supplier.