Block Paving / Brick Paver Calculator

How the block paving / brick paver calculator works

Divides the driveway area by the face area of one block to get the bare count, then adds a wastage allowance for cuts at the perimeter and breakages, and rounds up to whole blocks. The cost is the driveway area multiplied by the price per square metre (the rate suppliers typically quote, including the blocks themselves). Sand bedding and edging are sized separately — use the sub-base and edging tools for those.

Typical UK driveway and hard paving wastage

Block paving wastage is 5–7% on a rectangular drive, 10–15% on curves and circles. Gravel settles 10–15% with traffic. Our defaults reflect common UK trade allowances, and can be adjusted upwards for non-standard geometry or downwards where experience supports a lower figure.

What this tool does not do

It does not replace a professional quote, factor regional pricing, assess structural adequacy, or confirm Building Regulations compliance. Those remain the responsibility of a suitably qualified designer, surveyor, or your building control officer.

On-site considerations for block paving / brick paver

Permeable paving does not need planning permission on front gardens; impermeable surfaces over 5 m² do (or need an approved SUDS solution under the 2008 regulation change).

Building Regulations and compliance

Surface water from a drive must not run onto the public highway. Approved Document H and local bylaws require drainage to soakaway, permeable joints, or attenuation. When in doubt, a pre-application enquiry to the local authority can give early clarity, which tends to be less costly than retrospective correction.

Before you order

Keeping about 10% more blocks than the calculator result as spares helps with later repairs — colour batches drift year-on-year, and a new batch will be visible. Cross-checking the calculator’s output against a supplier quote helps catch differences in pricing assumptions — ask for exact product specifications (grade, finish, batch number) and confirm delivery timescales against your programme.

Adjusting the defaults

Every input in this calculator is editable. Enter your own dimensions, supplier prices, and wastage allowance — the output recalculates instantly. If the defaults feel off for your region or project type, your own numbers always override them.

Using this block paving / brick paver calculator alongside other BuildMetricLab tools

This calculator works best as part of a planning workflow. Pair the quantity with our project contingency, labour-hours, and material-cost calculators to build a complete estimate before you pick up the phone to a supplier. All BuildMetricLab tools run entirely in your browser — no sign-up, no data sent anywhere, and every formula is shown on-page so you can audit the maths.