Free Brick Calculator
UK 2026
The most accurate brick calculator UK for any wall project. Use the sliders to set your wall dimensions, select the number of windows and doors, and you will instantly get the exact bricks or blocks you need. Furthermore, mortar quantities and 5% wastage are already included. No sign-up required.
UK Brick & Block Reference — Quantities Per m²
Standard quantities for planning and estimating. All figures assume a standard 10mm mortar joint and consequently include a 5% wastage allowance. Furthermore, use the calculator above for exact quantities based on your specific dimensions and opening deductions.
| Wall Type | Thickness | Units per m² | Mortar (bags/m²) | Typical Use |
|---|---|---|---|---|
| Half-Brick Wall | 102.5mm | 60 bricks | 2.5 bags | Garden walls, internal partitions |
| Full-Brick Wall | 215mm | 120 bricks | 5.0 bags | Load-bearing external walls |
| 100mm Lightweight Block | 100mm | 10 blocks | 1.2 bags | Internal walls, thermal inner leaf |
| 140mm Block | 140mm | 10 blocks | 1.5 bags | Party walls, separating walls |
| 215mm Dense Block | 215mm | 10 blocks | 2.0 bags | Retaining walls, below DPC |
Standard window opening = 1.2 × 1.0m (1.20m²). Standard door opening = 0.9 × 2.1m (1.89m²). The calculator deducts these automatically.
5 Things to Check Before Ordering Bricks
Getting your brick order wrong is expensive and consequently delays your project significantly. Furthermore, matching bricks after the fact is often impossible. These are the checks carried out on every Signature Build project before a delivery is booked.
Same Batch
Always order all bricks from the same manufacturing batch number. Bricks from different batches vary in colour and texture — consequently, this becomes highly visible once built and is very difficult to remedy.
Order Enough First Time
Getting a second delivery of matching bricks is often impossible because the exact batch may be sold out. Therefore, order 5–10% more than the calculator result to allow for future repairs, damaged bricks and cuts at corners.
Check on Delivery
Inspect every pallet on delivery before the truck leaves. Chipped, cracked or wrongly coloured bricks should be rejected immediately. However, returning damaged bricks after the driver leaves is significantly more difficult and time-consuming.
Mortar Consistency
Mix mortar to a stiff, workable consistency. Furthermore, use the same sand-to-cement ratio throughout to ensure consistent joint colour. Never add extra water to stale or drying mortar — discard and mix a fresh batch instead.
Match Existing Work
If repairing or extending existing brickwork, take a sample brick to your supplier before ordering. Furthermore, matching Victorian or Edwardian brickwork requires specialist sourcing — consequently, most standard merchants will not stock what you need.
Reveals Add Waste
Window and door reveals require cut bricks that generate more waste than flat wall panels. Our 5% allowance covers standard work — however, add 8% if there are many openings or complex corner detailing.
Brick Calculator UK — FAQs
About This Brick Calculator UK — 2026
Signature Build Properties maintains this brick calculator UK as a free tool for homeowners, self-builders and contractors planning brickwork across West London. Our team has over 15 years of brickwork experience across extensions, boundary walls, garden walls and new builds. As a result, the quantities in this calculator reflect real on-site material use — not theoretical values that ignore practical wastage.
How the Calculator Works
The calculator follows standard UK brick dimensions of 215 × 102.5 × 65mm as specified by BS EN 771-1, with a standard 10mm mortar joint. Furthermore, it covers half-brick walls (60 bricks/m²), full-brick walls (120 bricks/m²) and lightweight concrete blocks (10 blocks/m²). Window and door openings are automatically deducted from the gross area. Consequently, the result reflects the actual net wall area you need to build.
Wastage and Mortar
All results include a 5% wastage allowance, which covers normal breakages, cuts at corners and reveals, and minor over-ordering. However, if your wall has many openings, complex corners or you are matching existing brickwork that may have a high reject rate, add 8–10% instead. Furthermore, mortar quantities calculate automatically based on wall type and net area — in 25kg premixed bags or bulk kilograms.
Get a Fixed-Price Quote
This calculator gives you an accurate material estimate for planning and budgeting. However, for a complete project cost including labour, scaffolding and preliminaries, you need a site visit. Therefore, call +44 7404 931629 or use the contact form to book a free survey. Moreover, all our brickwork projects use fixed-price contracts — so the figure we agree before work starts is the figure you pay.
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West London Construction
Extensions, loft conversions, renovations and new builds. Furthermore, we handle all brickwork in-house — no subcontracting. Based in Hayes and consequently covering all West London boroughs. Free site visit, no obligation.
