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26 September 2026: Same extension, more than three times the price to approve: what 91 councils charge for building control. Local figures for every council in the study are on our costs near you pages.
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- What it is: a free UK renovation cost calculator and cost guides for homeowners at estiquote.co.uk, and the iPhone app “Estiquote: Renovation Costs”.
- Prices: the website is free; the iPhone app is free to start, and Project Pass is £9.99 one-off (UK App Store price).
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Latest figures (September 2026)
Mid-range, UK average outside London, including VAT, before fees:
- House extension: typical £71,000 (single-storey rear, 25 m²), range £63,500 to £78,000
- Loft conversion: typical £52,500 (rear dormer, 30 m²), range £47,000 to £58,000
- 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 consumer unit (fuse board): typical £680 (dual rcd board (basic)), range £550 to £800
- EV charger installation: typical £1,100 (7 kw smart charger, standard installation), range £850 to £1,300
- Electrical safety report (EICR): typical £200 (2 or 3-bed house), range £150 to £250
- 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
- Unvented cylinder replacement: typical £1,800 (unvented cylinder, like-for-like), range £1,400 to £2,200
- 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 of England 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 91 councils: on current schedules, full plans approval for the same 10 to 40 m² extension costs £587 to £1,876 including VAT, 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.