Do I need Building Regs for a garden room?

As a rule of thumb: under 15m² internal floor area usually needs nothing; 15-30m² can be exempt if it's single-storey, far enough from boundaries and contains no sleeping accommodation; over 30m², closer to a boundary, or with sleeping use, Building Regs apply.

Where Regs apply - or where there's a beam or portal involved - you'll need construction drawings (and structural calcs from an engineer for any structure), which I can produce.

This is general guidance, not a determination - always confirm with your local Building Control. Use the checker to see the likely drawing list.

Garden room & garden office structural drawings