UK Standard
Building Regs — Part H — Drainage & SuDS
The Building Regulations — Approved Document H (Drainage and waste disposal)
In short: Approved Document H of the Building Regulations covers drainage and SuDS rules requiring on-site surface water management for areas over 5m².
What Building Regs — Part H covers
Under the Part H SuDS provisions, a new driveway or patio over 5m² must either drain to a permeable surface, soak away within the property, or have planning permission for connection to a drain.
Free-draining (permeable) construction — Type 3 sub-base under permeable paving, or a soakaway — is the usual way to satisfy Part H without a planning application.
Apply this standard
Calculators that use Building Regs — Part H
Official source: GOV.UK — Approved Document H. Figures on this page are a plain-English summary for estimating purposes — always refer to the published standard for compliance.