Cost FAQ
How much does a basement extension cost?
Drawings: from £4,500. Build: £90,000-£150,000 single-storey, £220,000-£380,000 double-storey. Add £15-30k for structural surveys.
Drawings: from £4,500. Build: £90,000-£150,000 single-storey, £220,000-£380,000 double-storey. Add £15-30k for structural surveys.
MCIAT chartered drawings for planning, building regs, lofts and extensions — fixed fees 30% below typical London architects. Tell us what you need and we’ll reply the same working day.
Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.
