Renovation & Building Costs UK
UK costs for renovations, extensions, new builds, garages, lofts, structural alterations, specialist removal work and major building projects.
Data review: 1 September 2026 · 13 guides · 13 calculators
Renovation & Building calculators
13 calculators use the same sourced guide data with transparent project and regional modelling assumptions.
House Renovation
Estimate a whole-home renovation by property size, scope, condition and postcode.
Open calculator →Live calculatorHouse Extension
Adjust project size, region, storeys, finish, kitchen and bathroom add-ons.
Open calculator →Live calculatorBuild a House
Estimate a new-build budget by floor area, specification, complexity and postcode.
Open calculator →Live calculatorBuild a Garage
Estimate single or double garage construction by roof type, groundwork complexity and postcode.
Open calculator →Live calculatorGarage Conversion
Estimate a garage conversion by floor area, garage type, finish level and postcode.
Open calculator →Live calculatorGarage Door Replacement
Estimate up-and-over, sectional, insulated, roller and electric garage-door replacement costs.
Open calculator →Live calculatorConservatory
Estimate lean-to, Victorian, Edwardian and higher-spec conservatory costs by area and postcode.
Open calculator →Live calculatorRSJ Beam
Estimate a common 1–5 metre RSJ beam, fitting and structural engineer allowance.
Open calculator →Live calculatorLoft Conversion
Compare Velux, dormer, hip-to-gable, mansard and bungalow loft budgets.
Open calculator →Live calculatorGarden Room
Estimate mini rooms, insulated office pods and high-spec cabins.
Open calculator →Live calculatorBuilder Labour
Estimate builder labour by days or hours, materials allowance and postcode-aware regional pricing.
Open calculator →Live calculatorLoad-Bearing Wall Removal
Estimate structural wall removal by opening size with engineer, building-control and making-good allowances.
Open calculator →Live calculatorAsbestos Removal
Estimate asbestos roof removal, domestic per-square-metre removal or encapsulation planning costs.
Open calculator →Renovation & Building guides
House renovation
Current UK whole-house renovation costs with a detailed 3-bedroom benchmark covering heating, rewiring, windows, plastering, kitchen, roof and other major works.
About £76,690 for the published 3-bed benchmarkView guide →Cost guideHouse extension
Current UK house extension costs per square metre, with worked size benchmarks, major cost drivers and regional planning context.
£1,800–£3,000 / m²View guide →Cost guideBuild a house
UK new-build and self-build costs per square metre, by house size, specification and project complexity.
£1,400–£3,000 per m²View guide →Cost guideBuild a garage
UK garage construction costs for single and double garages with flat or pitched tiled roofs.
About £25,000 for a single garage with flat roofView guide →Cost guideGarage door replacement
UK replacement garage door costs for up-and-over, roller, sectional, insulated and electric doors, including typical installation labour.
About £1,245–£4,000 including installationView guide →Cost guideLoft conversion
Current UK loft conversion costs for Velux, dormer, hip-to-gable, mansard, shell-only and bungalow projects, with 30m² comparison ranges.
About £50,000 for a typical conversionView guide →Cost guideGarage conversion
Typical UK garage conversion costs by garage type, floor area and intended use.
£10,000–£20,000View guide →Cost guideConservatory
Typical 2026 UK conservatory costs for lean-to, Victorian, Edwardian and higher-spec projects.
£9,000–£18,000 for common 3.5m × 3.5m stylesView guide →Cost guideGarden room
Typical UK garden room and garden office costs from mini self-assembly rooms to premium turnkey cabins.
£5,250 mini room / £11,750 office podView guide →Cost guideRSJ beam
UK RSJ steel beam supply and installation costs for openings, extensions and load-bearing wall work.
£200–£950 beam + £300–£750 installationView guide →Cost guideLoad-bearing wall removal
Current UK costs for removing a load-bearing wall, from doorway openings to larger open-plan knock-throughs, plus common professional allowances.
£1,250–£1,750View guide →Cost guideAsbestos removal
Current UK asbestos removal and encapsulation cost benchmarks for domestic projects, including roof removal and per-square-metre removal rates.
Most projects around £950–£3,750View guide →Cost guideBuilder day rate
Current UK builder day and hourly rate benchmarks for 2026, including self-employed and experienced-builder planning rates.
Around £400 / dayView guide →