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London pillar

Basement extensions in London

every London borough's basement policy and what's approvable today.

Architectural detail on a London period property — basement conversions
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

All 33 boroughs

Choose your borough

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.

Get borough-specific advice

Free site survey. Fixed fees. MCIAT chartered.

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