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Stamp-duty impact of an extension calculator

Does your extension push the property into a higher stamp duty band?

Interactive calculator UI scheduled for Phase 4 — until then, get a fixed-fee quote tailored to your project below.

London terraced street — typical residential housing for house extensions in London
Free fixed-fee quote

Tell us about your project

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.

  • MCIAT chartered
  • Same working-day reply
  • Fixed fees from £840

Book a call

Speak to a chartered technologist — free 15 minutes

Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.