Results for “extension cost”
70 pages found · cost guides, calculators, planning rules and local builders
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Kitchen Extension Cost UK 2026 | £42k-£85k Fully Fitted
How much does a kitchen extension cost UK 2026? Small £34k-£55k, standard 20-30m² £42k-£72k, large £58k-£95k fully fitted.
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Double-Storey Extension Cost UK 2026: From £44,000 by Size
Double-storey extension costs from £44,000 in 2026 (typical range £44,000-£67,500). Real UK prices by footprint and type, 50m² costs and the materials split.
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House Extension Cost UK 2026: £1,650-4,200/m2 Single, Two-Storey
Real Q3 2026 UK extension cost per m² by region: £1,650-4,200/m². Single-storey, two-storey, wrap-around, side return + brick vs timber vs SIP. Free quotes.
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Extension Cost by Size UK 2026: £1,650-£4,200 per m²
Extension cost by size for 2026: 3m x 3m from £16,500, 4m x 4m from £26,500, per m² £1,650-£4,200. Every size priced, single and double storey, UK-wide data.
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Side Return Extension Cost UK 2026 | £45k-£85k Victorian Terrace
How much does a side return extension cost UK 2026? Narrow £38k-£58k, standard £45k-£70k, wide £55k-£85k, wrap-around £70k-£110k.
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House Extension Cost Index UK 2026 | Regional Prices Compared
BestBuilders 2026 house extension cost index — regional starting prices across 14 UK regions.
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Wraparound Extension Cost UK 2026 | Free Quotes
How much does a wrap-around extension cost in 2026 UK? £55,000–£75,000 small (15 m²), £72,000–£105,000 mid (25 m²), £100,000–£140,000+ large (40 m²+).
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Concrete Extension Cost 2026 UK: Price per m2 & Totals
How much does a concrete extension cost in 2026? Expect £1,800-£3,000/m2 for traditional, plus an ICF premium. See foundation, slab & size-by-size totals.
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Flat Roof Extension Cost UK 2026: £22k-£95k (15-30m²)
How much does a flat roof extension cost UK 2026? £22k-£38k (15m²), £42k-£60k (25m²), £65k-£95k (30m²+). EPDM vs GRP, Part L 2026 + free free quotes.
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Side Return Extension Cost UK 2026: £30k–£140k
How much does a side return extension cost in 2026? £30k–£140k depending on width & spec. Full UK width/region pricing + real Clapham worked example at £73,200.
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Flat Roof Extension Cost Per m² UK 2026 | £1,700–£2,300
Flat-roof extension cost per m² in 2026: £1,700–£2,300/m² standard, £2,600–£3,200/m² premium. EPDM, GRP & TPO rates, 9-region matrix + free quotes.
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Kitchen Extension Cost UK 2026 | Free Quotes Guide
Kitchen extension cost UK 2026: £35,000–£75,000 typical. Full split between extension shell and kitchen fit-out, regional pricing & 6 money-saving tips.
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How Much Does a Semi-Detached Extension Cost in 2026? (UK)
Semi-detached extension cost in 2026: a single-storey rear extension runs £40,000–£75,000, a double-storey £75,000–£130,000 and a wraparound…
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How Much Does a Terraced House Extension Cost in 2026? (UK)
Terraced house extension cost in 2026: a single-storey rear extension typically runs £30,000–£50,000, a side-return £40,000–£65,000 and a double-storey…
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Rear Extension Cost UK 2026 | Full Price Guide
Rear extension cost UK 2026: £27,000–£100,000 depending on size. Full breakdown with cost per m², regional pricing & 2026 price changes. Get 3 free quotes.
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How Much Does a Flat Roof Bathroom Extension Cost in 2026? (UK)
Flat roof bathroom extension cost in 2026: shell at 1,800-2,600 per m2 plus a 4,000-9,000 bathroom fit-out.
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How Much Does an L-Shaped Extension Cost in 2026? (UK)
L-shaped extension costs in 2026 UK: £58,000-£135,000 for a typical 3-bed semi. Side-return-plus-rear pricing, glazing premiums, regional ranges and…
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How Much Does a Pitched Roof Extension Cost in 2026? (UK Price Guide)
How much does a pitched roof extension cost in 2026? UK rates run £2,400-£3,200 per m² fitted - a 4x5m extension typically £50,000-£65,000. Full breakdown.
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How Much Does an Orangery Extension Cost in 2026? (UK)
Orangery extension cost UK 2026: expect £30,000–£75,000+ depending on size, glazing and groundworks.
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How Much Does a Flat Roof Extension Cost in 2026? (UK)
A single-storey flat roof extension costs about £2,000–£2,600/m² in 2026 — roughly £40,000–£65,000 for a typical 20m² build.
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Extension Cost Per M2 UK 2026: Element Price Breakdown
Extension cost per m2 in 2026: £1,700–£3,500 depending on spec. See the element-by-element breakdown and get 3 free quotes.
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Side Extension Cost UK 2026: Side Return Price Guide
Side extension cost 2026: side returns run £40,000–£70,000 all-in in London, less elsewhere. Get 3 free quotes from local builders.
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Rear Extension Cost UK 2026: Prices by Size and Spec
A rear extension costs £30,000–£40,000 for a typical 15m2 in 2026. Compare prices by size and get 3 free quotes from local builders.
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Single Storey Extension Cost UK 2026: Full Price Guide
Single storey extension cost 2026: £1,900–£2,600 per m2 at standard spec. See prices by size, then get 3 free quotes from local builders.
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Side Extension Cost UK 2026: £25k–£90k Width Pricing
How much does a side extension cost in 2026? £25,000–£90,000 depending on width, spec and storey count.
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Garage Extension Cost UK 2026: £18k–£55k | Free Quotes
How much does a garage extension cost in 2026 UK? £18k–£26k single (15m²), £28k–£42k double (30m²), £42k–£55k with room above.
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Single Storey Extension Cost UK 2026: £22k–£54k by Size
Single storey extension cost UK 2026: around £22k for 12m², £36k for 20m², £54k for 30m² (£1,800–£2,400/m² build cost).
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Bathroom Extension Cost UK 2026: £15k–£45k + Free Quotes
Bathroom extension cost UK 2026: £15,000–£45,000 depending on size (3m²–10m²+) and plumbing complexity.
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Porch Extension Cost UK 2026: £2,800–£14,000 Guide
How much does a porch extension cost in 2026 UK? £2,800–£4,500 lean-to uPVC, £4,500–£8,500 brick front porch, £7,500–£14,000 large enclosed porch.
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Extension Cost Per m2 in 2026: What Changed
Extension cost per m2 in 2026: how UK build rates moved this year, why the regional gap widened and what drives your price. Get free quotes.
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House Extension Cost Per m2 UK (2026 Rates)
House extension cost per m2 in the UK for 2026: rates by extension type, region and spec, plus what the rate excludes. Get free builder quotes.
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Terrace House Extension Cost 2026 (UK) | BestBuilders
How much does a terrace house extension cost in 2026? Rear £2,500-£3,400/m², side-return £2,800-£3,600/m², plus Party Wall fees. Get 3 free quotes.
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Victorian Terrace Extension Cost 2026 UK | BestBuilders
How much does a Victorian terrace extension cost in 2026? Side-return infill, rear, wrap-around, two-storey & basement £ and £/m² ranges, regional table,…
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Average Cost of a Detached Extension in 2026 (UK)
A detached extension costs roughly £1,300–£2,100/m² as a garden room, or £2,200–£3,200/m² as a self-contained annexe in 2026. Here's the full UK breakdown.
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Average Cost of a Semi-Detached Extension in 2026 (UK)
A semi-detached extension costs about £2,000–£2,900/m² in 2026 — around £42,000–£58,000 for a typical 20m² single-storey build.
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Extension Build Cost Per m² in 2026 (UK)
A single-storey extension costs about £2,000–£2,600 per m² to build in 2026, from £1,600 basic to £3,000+ glazed. See per-m² rates by type and region.
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Average Cost of a Bungalow Extension in 2026 (UK)
A bungalow extension costs about £2,000–£2,800 per m² in 2026 — roughly £40,000–£56,000 for a typical 20m² build. See the full breakdown by size and region.
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Average Cost of a Side Return Extension 2026: £40k–£75k UK
Average side return extension cost in 2026: £40,000–£75,000, or £2,800–£4,200 per m². Victorian terrace infill pricing, spec tiers & regional rates.
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Wraparound Extension Cost Calculator UK 2026 | Free Tool
Estimate wraparound extension costs in 30 seconds. Priced by floor area, spec, glazing and UK region — the biggest ground-floor change you can make.
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Side Return Extension Cost Calculator UK 2026 | Free Tool
Estimate side return extension costs in 30 seconds. Priced by length, width, spec and UK region, with the party wall and glazing that terraces always need.
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Double-Storey Extension Cost Calculator UK 2026 | Free Tool
A double-storey extension costs £28,000-£34,500 at 3m x 4m, £39,000-£48,000 at the common 4m x 5m and £47,000-£57,000 at 5m x 5m. Price your exact footprint and roof in 30 seconds.
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Bathroom Extension Cost Calculator UK 2026 | Free Tool
Estimate bathroom extension costs in 30 seconds. Priced by size, spec, drainage and UK region — where a small footprint carries a high services cost.
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Kitchen Extension Cost Calculator UK 2026 | Free Tool
A 20m2 kitchen extension totals around £47,500 with a mid-range kitchen: £36,000 shell at £1,800/m2 plus units, appliances and doors. Price your exact size and spec in 30 seconds.
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Driveway Extension Cost Calculator UK 2026 | Instant Estimate
Price driveway extension in 30 seconds using our published 2026 UK figures, adjusted for your region. Free estimate and 3 quotes.
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Rear Extension Cost Calculator UK 2026 | Free Instant Tool
Free 2026 UK rear extension cost calculator, updated August 2026. Price by depth, width, spec, knock-through and glazing for an instant real-rate estimate.
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Single Storey Extension Cost Calculator UK 2026 | Free Tool
A single-storey extension costs £28,500-£39,000 at standard spec, £62,500-£80,000 with a kitchen fit-out and £84,000-£105,000 premium glass-heavy. Price your exact size in 30 seconds.
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Extension Cost Calculator UK 2026 | Instant £/m² Estimate
Real Q3 2026 UK extension cost calculator: £1,650-4,200/m² by region. Single + two-storey + wraparound + side return. ±15% accuracy. Free quotes.
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Compare Extension Costs: What Affects Price in 2026 (UK)
Compare UK home extension costs 2026: rear £1,800–£2,800/m², side return £2,000–£3,200/m², wraparound £2,200–£3,500/m². What actually drives the price.
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Extension Costs: Timber Frame vs Brick in 2026 (UK)
Timber-frame extensions cost £1,800–£2,400/m² vs brick at £2,000–£2,800/m² in 2026, but the picture is more complex on build speed, thermal performance,…
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3 Meter House Extension Cost UK 2026: The 3m Rule
A 3 meter house extension costs about £30,000–£40,000 in 2026. Why 3m is the permitted development sweet spot, plus get 3 free quotes.
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Front Porch Extension Cost UK 2026: Prices and Rules
A front porch extension costs £3,500–£8,000 in 2026. Porch prices by size, permitted development rules and how to get 3 free quotes.
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Lean To Extension Cost UK 2026: Prices and Full Guide
A lean to extension costs £1,700–£2,200 per m² in 2026, the cheapest way to extend. See prices and get 3 free quotes.
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Glass Extension Cost UK 2026: Frameless Glazing Guide
Glass extensions cost £3,000–£4,500 per m² in 2026. Frameless glazing prices, Part L rules and how to get 3 free quotes.
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Conservatory Extension Cost UK 2026: Full Price Guide
Conservatory extensions cost £1,200–£2,500 per m² in 2026. Compare hybrid and traditional options and get 3 free quotes today.
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Wrap Around Extension Cost UK 2026: Price Guide
A wrap around extension costs £2,000–£2,800 per m² in 2026, with totals of £60,000–£120,000.
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Mansard Extension Cost UK 2026: Prices and Planning
A mansard extension typically costs £45,000–£90,000 in 2026. See what the 70-degree roof storey involves and get 3 free quotes from…
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First Floor Extension Cost UK 2026: Full Guide
A first floor extension costs £1,500–£2,200 per m² in 2026 if the structure below is sound.
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Dormer Extension Cost UK 2026: Prices and Planning
A dormer extension costs £20,000–£60,000 in 2026 depending on size and type.
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Timber Frame Extension Cost UK 2026: Price Guide
Timber frame extensions cost £1,700–£2,400 per m² in 2026 and build 20–30% faster than blockwork.
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Garage Extension Cost UK 2026: Above or Beside Guide
Garage extension cost 2026: a room above runs £1,400–£2,000 per m2 if foundations pass. Check the gate, then get 3 free quotes.
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Single vs Double Storey Extension Cost UK 2026
Single vs double storey extension UK 2026: single £30k–£60k, double £55k–£110k. Compare cost per m², planning, ROI, build time and which adds more value.
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Kitchen Extension vs Rear Extension: Cost Compared (2026)
Kitchen extension vs rear extension cost in 2026: which is cheaper and which adds more value? Full price comparison per m², by size, plus how to choose…
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Roof Lantern Extension: Cost & Options 2026 (UK)
A roof lantern extension costs £2,000–£2,800 per m² in 2026, so a 20m² build runs about £42k–£58k. See lantern sizes, glazing options and the planning rules.
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Flat Roof Extension: Cost & Options 2026 (UK)
A flat roof extension costs £1,800–£2,600 per m² in 2026. See what drives the price, roof covering options, rooflights, and planning and building rules.
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Converting a Conservatory to an Extension: 2026 Costs
Converting a conservatory to an extension costs £15,000–£40,000. See 2026 prices, building regs rules and get 3 free quotes.
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Double Storey Extension Cost UK 2026: £68k–£175k
Two-storey extension cost 2026: £68k–£95k for 30m², £85k–£135k for 40m², £120k+ for 60m²+. UK regional pricing, worked £142,800 Bristol example, hidden costs.
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Average Kitchen Extension Cost UK 2026: £42k–£85k Fitted
Average cost of a new kitchen extension in 2026: £42,000–£85,000 fully fitted. Shell vs fit-out split, the 20–30% most budgets miss, regional variation and ROI.
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Average Cost of a Wrap Around Extension in 2026 UK
The average wrap around extension costs £60,000–£120,000 in 2026, with most 30–35m² builds around £75,000–£90,000. See regional averages and cost drivers.
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Is a Loft Conversion Cheaper Than an Extension? UK 2026
Loft conversion vs extension cost UK 2026: dormer loft £45k–£70k vs single-storey extension £60k–£110k. Value-added, planning, disruption and resale analysis.
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Is a Home Extension Cheaper With Modular Build in 2026?
Modular vs traditional extension cost in 2026 UK: both sit around £2,200–£3,200/m². Modular wins on speed and cost certainty; groundworks and craneage…