Structure
The statutory requirement covering structural safety of buildings in England and Wales. Approved Document A sets out acceptable methods for meeting Part A: foundation design (type, depth, width, concrete grade), wall and roof structural calculations, stability against disproportionate collapse, and combined dead/imposed/wind loading. For extensions, Part A governs the minimum 1m foundation depth to firm ground, trench fill vs strip foundation rules, and steelwork specifications. Your structural engineer designs to Part A and building control checks against it.
Pages where Part A comes up
12 guides reference Part A, grouped by build phase.
Planning
Structure
First fix
Completion
Want the full picture?
The buildwiz build guides walk through a UK extension in sequence and link to Part A (and every other Approved Document) at the exact stage it bites. That is usually a more productive way to use this material than reading the document cover to cover.