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Brick Boundary Wall Calculator
Calculate bricks, piers, coping stones, mortar and foundation concrete for brick boundary walls. Half-brick or one-brick construction.
Total boundary wall length
Max 2m without planning (1m at highway)
Structural piers at regular intervals
Your supplier's price per brick
Max 3m for half-brick, 4m for one-brick
Minimum 450mm below ground
Extra bricks for cuts and breakages
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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 one-brick wall with piers at 3m and 10% wastage: ~2,376 wall bricks + ~192 pier bricks = ~2,568 total bricks, plus 17 coping stones (standard 600mm units) and ~2.7 m³ of foundation concrete at the calculator's default 450mm depth. Note that a wall this tall (over 1.2m) would normally need a deeper foundation — at 600mm the same wall needs ~3.6 m³; increase the Foundation Depth input accordingly (see the foundation FAQ). A half-brick wall of the same face area uses roughly half the bricks, but is only safe at much lower heights (see Wall Type note).
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
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.
Piers improve lateral stability against wind loading. For a half-brick wall, piers should be spaced at a maximum of 3m centres; for a one-brick wall, up to 4m. Piers should also sit at each end, at changes of direction, and either side of gates. Important: pier spacing alone does not make a tall single-skin wall safe. gov.uk 'Your garden walls: better to be safe' gives maximum unpiered heights of roughly 375–525mm for a half-brick (100mm) wall and 1,075–1,450mm for a one-brick (215mm) wall depending on wind exposure, and states that walls incorporating piers, supporting gates, or retaining soil fall outside that guidance and should be designed by a structural engineer to BS EN 1996 (with PD 6697).
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.
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.
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 — one bag lays roughly 40-50 bricks in a half-brick wall, but only 25-35 in a one-brick wall because of the extra mortar in the collar joint between the two skins.
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Last updated: March 2026
Verified against UK standards · estimates only, confirm with your supplier.