How Many Bricks Do I Need? A UK Guide to Estimating Brickwork
Published 9 July 2026 · Browse all tools
Estimating brickwork quantities is one of those jobs that looks simple until you get it wrong. Order too few and you risk a batch mismatch when you go back for more — brick colour and texture varies between firings, and your supplier may not have the same batch in stock. Order too many and you are paying to store or return material. This guide walks through the standard UK method for calculating brick quantities, explains where the 60 bricks per m² figure comes from, and covers the common mistakes that throw estimates off.
Use the Brick Calculator UK hereThe standard UK brick size
The work size of a standard UK brick is 215mm long × 102.5mm wide × 65mm tall. With a standard 10mm mortar joint on the bed and perpendicular faces, the coordinating size becomes 225mm × 112.5mm × 75mm. This coordinating size is what you use for quantity calculations — it represents the space each brick occupies in the wall including its share of the mortar.
UK bricks are manufactured to BS EN 771-1. Most facing bricks, commons, and engineering bricks sold at builders merchants including Travis Perkins, Jewson, and Buildbase conform to these dimensions. Reclaimed, handmade, or imported bricks may differ, so always measure a sample before calculating.
How many bricks per square metre?
For a half-brick wall (single skin, stretcher bond) using standard UK bricks with a 10mm mortar joint:
Bricks along 1 metre = 1000 ÷ 225 = 4.44. Brick courses per metre height = 1000 ÷ 75 = 13.33. Bricks per m² = 4.44 × 13.33 = 59.3 — rounded up to 60 bricks per m².
This 60 bricks per m² figure is the standard UK industry rule of thumb for stretcher bond. It assumes a standard UK brick (215 × 65mm work size), 10mm mortar joints throughout, and half-brick (single skin) construction. For a full brick wall (one brick thick), double the count to approximately 120 bricks per m².
How to calculate the number of bricks you need
Follow these four steps:
- Step 1 — Calculate the wall area. Multiply the wall length by the wall height. For a wall 4.5m long and 1.8m high: 4.5 × 1.8 = 8.1 m²
- Step 2 — Subtract any openings. Deduct the area of any doors, windows, or gate openings. A standard door opening is approximately 0.9m × 2.1m = 1.89 m². So: 8.1 − 1.89 = 6.21 m²
- Step 3 — Multiply by bricks per m². 6.21 × 60 = 372.6 — round up to 373 bricks.
- Step 4 — Add waste. For a straightforward job: 373 × 1.05 = 391.7 — order 400 bricks. For a job with lots of cutting: 373 × 1.10 = 410.3 — order 500 bricks (next full pack up).
Worked example — garden boundary wall
A garden boundary wall 8m long and 1.0m high, built in half-brick stretcher bond using standard facing bricks with a 10mm mortar joint.
Wall area: 8 × 1.0 = 8.0 m². Bricks required: 8.0 × 60 = 480. Waste at 5%: 480 × 1.05 = 504. Order: 500 bricks (one full pack) plus 50 loose, or two packs of 400 (800 total, giving a useful buffer for future repairs).
At a 2026 price of around £400–£600 per 500 standard facing bricks from Travis Perkins, that puts the brick material cost at roughly £400–£600 before mortar, sand, and delivery.
What affects brick quantity beyond the basic calculation?
- Bond pattern. Stretcher bond (the most common) gives approximately 60 bricks per m². English bond and Flemish bond both use headers which increases the count — English bond uses roughly 90 bricks per m² for a full brick wall.
- Mortar joint width. A wider mortar joint means fewer bricks per m². Varying the joint from 10mm to 12mm reduces the brick count by roughly 3–4%. This calculator lets you adjust the joint width if your specification differs.
- Cutting and waste. Corners, reveals around openings, curved walls, and complex bond patterns all increase waste. A simple straight wall needs 5% waste. A wall with multiple openings and corners needs 10%. Decorative brickwork can need 15% or more.
- Brick type. Engineering bricks, modular bricks, and large-format bricks all have different work sizes. Always check the actual dimensions of the specific product you are using.
Common mistakes when ordering bricks
- Ordering to the exact calculation. Never order exactly the quantity the calculation gives you. Always round up to the next full pack — bricks are sold in packs and partial packs are rarely available at the same price.
- Forgetting batch numbers. Bricks are fired in batches and colour can vary between batches. If you need to reorder, you may not be able to match the original batch. Order generously the first time and keep a few spares.
- Measuring the wrong thing. The calculation uses wall face area, not floor area. A common mistake on garden walls is calculating the ground footprint rather than the vertical face area of the wall.
- Ignoring openings. Every window, door, or gate opening should be subtracted from the wall area before calculating.
Quick reference — bricks per m² by wall type
- Half brick (single skin), stretcher bond: 60 bricks per m²
- Full brick (one brick thick), stretcher bond: 120 bricks per m²
- Full brick, English bond: approximately 90 per face
- Full brick, Flemish bond: approximately 80 per face
Use the free Brick Calculator UK
Rather than doing the maths by hand, use the Brick Calculator UK at /tools/brick-calculator-uk on this site. Enter your wall dimensions, choose your brick size and wall type, set your mortar joint width and waste allowance, and get an instant brick count. It handles standard UK bricks, metric bricks, and custom sizes, and works for both half-brick and full brick walls.
Disclaimer
This guide is for planning and estimating only. Always confirm quantities with your supplier before ordering. Brick counts vary with bond pattern, size tolerances, and site conditions.