What's covered
This page is the deep-dive index for House Extensions. Read it linearly or jump to the section you need.
1. Why people choose house extensions
Three common drivers in London: family-growth space pressure, value uplift on Victorian/Edwardian stock, and rising rent making moving up the ladder uneconomic. House Extensions captures all three.
2. The planning route
For most London homes that aren't flats, listed or in conservation areas, house extensions qualifies under Permitted Development. The house extension 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.
3. Building regulations
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 house extension drawings. Sign-off via LABC or Approved Inspector.
4. Pricing in detail
Drawings: fixed fee from £1,225. 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.
5. Common pitfalls
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.
