UK Standard

BS EN 771-1 — Clay Masonry Units

BS EN 771-1 — Specification for masonry units. Clay masonry units

In short: BS EN 771-1 is the specification for clay masonry units (bricks), defining dimensions, tolerances and properties for UK brickwork.

What BS EN 771-1 covers

It standardises the clay bricks used in walls so that quantities, coursing and mortar requirements are predictable.

Standard UK brick format works to a coordinating size of 225 × 112.5 × 75mm including a 10mm mortar joint.

Apply this standard

Calculators that use BS EN 771-1

Brick & Block Calculator

Bricks or blocks required based on wall dimensions and bond pattern.

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Mortar Mix Calculator

Sand and cement quantities for any mortar mix ratio and wall area.

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Official source: BSI Knowledge — BS EN 771-1. Figures on this page are a plain-English summary for estimating purposes — always refer to the published standard for compliance.