For a standard single-skin brick wall, calculate 60 bricks per m² inclusive of a 10mm mortar joint. For blockwork, use 10 blocks per m². Under 2026 UK professional standards, add a 10% wastage factor for cuts. A standard brick weighs ~2-3kg; a 100mm solid block weighs ~18-20kg.
Wall Measurements
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Total Wall Area:0.00 m²
Total Bricks Needed:0
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Expert Note: Results include your selected wastage allowance. Standard brick packs usually contain 400-500 bricks.
Planning a new garden wall, extension, or garage? Running out of bricks halfway through a build is incredibly frustrating, and ordering too many ties up your budget in surplus materials. An accurate brick calculation is the first step of any successful masonry project.
Our Brick Calculator removes the guesswork. By inputting your wall dimensions and specifying the type of brick or block, it instantly figures out the total units required, factoring in the thickness of standard mortar joints and your chosen waste allowance.
The Standard UK Brick Size
The standard metric size for a UK facing brick is 215mm long x 65mm high x 102.5mm deep. However, when calculating how many bricks you need, you must also include the standard 10mm mortar joint that surrounds the brick.
With the 10mm mortar joint included, the "coordinating size" of a single brick becomes 225mm x 75mm.
How Many Bricks per Square Metre?
Using the standard sizes above, the rule of thumb for single-skin (half-brick) walls is:
Standard Bricks: 60 bricks per square metre (m²).
Standard Concrete Blocks (440 x 215 x 100mm): 10 blocks per square metre (m²).
If you are building a double-skin wall (full brick wall or cavity wall), simply double these numbers (e.g., 120 bricks per m²).
Why Add a Waste Allowance?
Bricks get dropped and chipped on-site. You'll also need to make cuts when forming corners (quoins) or building around doors and windows. It is standard practice to add a 5% waste allowance to your total order. If your design includes lots of intricate cuts or decorative bonding patterns (like Flemish bond), consider increasing the waste allowance to 10%.
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UK Building Regulations: Walls & Boundaries
Constructing a garden wall is usually "Permitted Development", but height and structural safety are strictly regulated in the UK:
Height Next to Highway: Walls adjacent to a road or footpath used by vehicles are typically limited to 1 metre in height.
General Height Limit: Most other boundary walls can be up to 2 metres high before requiring planning permission.
Structural Stability: Any wall over 1m should ideally feature pillars (piers) at regular intervals to prevent collapse from wind loading.
Listed Buildings: You almost always need permission to build or alter walls within the boundary of a "Listed Building" or in "Conservation Areas".
Yes, we recommend adding 5% to 10% to your final count to account for half-bricks, cuts at the ends of walls, and potential breakages during transport or on-site handling. Our wastage slider above allows you to fine-tune this based on wall complexity.
How many bricks are in a full pack?
Standard UK brick packs typically contain between 400 and 500 bricks, depending on the manufacturer. Always check the pack size before ordering to ensure you have full packs for better price-per-brick value.
Do I need to deduct for windows and doors?
Yes, you should subtract the area of any large openings (like doors or garage portals) from your total wall area before calculating. For small windows, many builders ignore the deduction to provide a 'safety margin' of extra bricks.
How many standard bricks in a square metre?
There are exactly 60 standard UK bricks (215 x 65 x 102.5mm) in one square metre of single-skin wall, assuming a standard 10mm mortar joint.
How many standard hollow blocks in a square metre?
There are exactly 10 standard concrete blocks (440 x 215 x 100mm) in one square metre of single-skin blockwork, assuming a 10mm mortar joint.
What is the difference between facing and engineering bricks?
Facing bricks are chosen for their aesthetics and are used on the visible exterior of a building. Engineering bricks have high compressive strength and low water absorption, used below ground level as damp proof courses.
Do I need to soak bricks before laying?
Sometimes. Highly porous handmade bricks may need dampening in hot weather so they don't immediately suck all the moisture out of the fresh mortar, causing a weak bond.