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26 September 2026: Same extension, up to 2.7 times the price to approve: what 92 councils charge for building control. Local figures for every council in the study are on our costs near you pages.
Estiquote in brief
- What it is: a free UK renovation cost calculator and cost guides at estiquote.co.uk, and the iPhone app “Estiquote: Renovation Costs”.
- Prices: free to use; Project Pass £9.99 one-off; Estiquote Trade £19.99 a month (UK App Store prices).
- Independent: not a builder or trade marketplace; does not sell user details.
- Company: Labii Reatum Limited, company number 17174080.
- Contact: support@estiquote.co.uk
Latest figures (September 2026)
Mid-range, UK average outside London, including VAT, before fees:
- House extension: typical £70,500 (single-storey rear, 25 m²), range £63,000 to £78,000
- Loft conversion: typical £63,000 (rear dormer, 30 m²), range £56,500 to £69,500
- New kitchen: typical £12,500 (supply and fit, medium), range £9,000 to £16,000
- Bathroom: typical £7,500 (full bathroom refit, same layout), range £6,000 to £9,000
- Garage conversion: typical £17,400 (integral or attached single garage), range £14,400 to £20,500
- Whole-house renovation: typical £108,000 (full renovation (rewire, heating, kitchen, bathroom, plaster), 90 m²), range £86,500 to £130,000
- New build house: typical £364,000 (built by a main contractor, 140 m²), range £322,000 to £406,000
- House rewire: typical £6,300 (3-bed house), range £5,400 to £7,200
- New roof: typical £12,300 (pitched roof, semi-detached house), range £10,500 to £14,000
- Knock-through with steel beam: typical £4,200 (3 to 4 m), range £3,000 to £5,400
- New boiler: typical £2,900 (combi boiler, like-for-like swap), range £2,500 to £3,200
- Air source heat pump: typical £13,500 (3-bed home (before £7,500 grant)), range £12,000 to £15,000
- Replacement windows: typical £6,500 (3-bed semi (about 10 windows)), range £5,500 to £7,500
Regional factors: London 1.35, South East 1.15, East 1.07, South West 1.04, West Midlands 0.97, East Midlands 0.95, Scotland 0.95, North West 0.93, Yorkshire and the Humber 0.92, Wales 0.90, North East 0.88, Northern Ireland 0.82.
Original research
- Building control fees at 92 councils: the same small extension costs £587 to £1,584 to approve depending on the council.
Data downloads
- UK Renovation Cost Index 2026 Q3 (CSV)
- Building control fees 2026 (CSV)
- Cost model and assumptions (JSON)
Data is licensed under Creative Commons Attribution 4.0. Method: how Estiquote estimates work.