Everything we know about basement conversions in London, in one place.
This page is the deep-dive index for Basement Conversions. Read it linearly or jump to the section you need.
Three common drivers in London: family-growth space pressure, value uplift on Victorian/Edwardian stock, and rising rent making moving up the ladder uneconomic. Basement Conversions captures all three.
For most London homes that aren't flats, listed or in conservation areas, basement conversions qualifies under Permitted Development. The basement conversion drawings test: under volume threshold, materials match, eaves setback. Where Article 4 applies, the LDC route gives certainty before building. Where conservation rules apply, full planning is required.
Part L (thermal), Part B (fire), Part M (access), Part K (stairs/falls), Part E (acoustic), Part F (ventilation). Each governs a different aspect of the basement conversion drawings. Sign-off via LABC or Approved Inspector.
Drawings: fixed fee from £1,950. Council fees: £103-£206. Building regs fees: £400-£900. Structural engineer: £800-£1,500. Party Wall surveyor (where applicable): £450-£1,500/neighbour. Build cost: separate quote from a contractor.
Wrong PD assumption (Article 4 area). Material non-match in conservation areas. Insufficient Heritage Statement detail on listed property. Missing Party Wall notice triggering legal injunction. We solve all of these as standard.