Loft Conversion Guides for 2026
Everything you need to plan a UK loft conversion in 2026 — dormer, Velux, mansard and hip-to-gable costs, permitted development rules, staircase regs and how long the work really takes.
Essential Loft Conversion Pages
A loft conversion is one of the highest-value improvements a UK home can have, typically starting from around £30,000 and adding a bedroom or office without extending the footprint. The right type depends on your roof: a simple Velux conversion suits good existing head height, dormers add usable floor space, and mansard or hip-to-gable conversions maximise smaller roofs.
Most loft conversions fall under permitted development, but staircase position, fire regulations and party-wall agreements still catch people out. The guides below cover every cost, planning and design question we're asked — all updated with real 2026 UK prices.
All 94 Loft Conversion Guides
All guide topics →Loft Ladder Installation Guide
Learn how loft ladder installation works in the UK. Compare ladder types, safety, building regs and get quotes from vetted local installers.
Read guide →Hip to Gable Loft Conversion UK Guide
UK hip to gable loft conversion guide: benefits, planning and how it’s built. Compare options and request quotes from loft conversion specialists.
Read guide →Dormer Loft Conversion Cost & Options 2026 (UK)
A dormer loft conversion costs £30,000–£60,000 in 2026, depending on size, whether you add an en-suite and the level of finish. We break down the price, typical timescales, planning rules and how much value a well-built…
Read guide →How to Get a Grant for a Loft Conversion in 2026 (UK Guide)
There is no general government grant for a full loft conversion in 2026, but you may access funding for insulation and energy-efficiency works through schemes like ECO4 if you qualify. Here is how to find and apply for…
Read guide →Is a Loft Conversion Cheaper Than Moving? UK 2026
In 2026 a loft conversion (£40k-£70k) is often cheaper than moving to a larger home once you add stamp duty, estate agent fees, legal costs and moving expenses - which frequently total £30k-£60k+ with nothing to show…
Read guide →How to Reduce the Cost of a Loft Conversion UK 2026 (12 Levers)
Want a cheaper loft conversion in 2026 UK? 12 specific levers can cut £4,000–£12,000 from a typical £35k–£55k job without sacrificing structural quality or resale value. Includes timing tricks, supplier-led savings, and…
Read guide →Mansard Loft Conversion Cost UK 2026 (Full Breakdown)
A mansard loft conversion in 2026 UK costs £55,000–£95,000 fully finished — the most expensive loft type but also the largest space gain (often 35–55m²). Cost ladder by floor area, party-wall friction and conservation…
Read guide →Garage Conversion vs Loft Conversion 2026: Which Adds More Value?
In 2026 UK, a loft conversion typically adds £35,000–£60,000 of value vs £15,000–£30,000 for a garage conversion — but loft costs 2–3x more upfront. Cost, ROI, time and planning compared.
Read guide →Velux Loft Conversion Cost UK 2026 (Full Breakdown)
A Velux (rooflight-only) loft conversion in 2026 UK runs £22,000–£38,000 fully finished — the cheapest loft conversion type since there's no dormer or roof structure change. Cost ladder by floor area, staircase route…
Read guide →How to Plan a Loft Conversion for an End-of-Terrace 2026
How to plan a loft conversion for an end-of-terrace house in 2026: end-of-terrace homes often suit a hip-to-gable or dormer conversion, involve one shared party wall, and cost £45,000-£75,000. Follow this step-by-step…
Read guide →How Much Does a Loft Conversion Cost in 2026? UK
2026 UK loft conversion costs by type — Velux, dormer, hip-to-gable and mansard — with regional pricing, ROI data, and the full cost breakdown by element.
Read guide →Mansard Extension Cost UK 2026: Prices and Planning
Mansard extensions cost £45,000–£90,000 in 2026. Why the 70-degree London terrace classic almost always needs planning permission, and what the build involves.
Read guide →Dormer Extension Cost UK 2026: Prices and Planning
Dormer extensions cost £20,000–£60,000 in 2026. Box vs pitched dormers, the 40/50m³ permitted development caps, build times and how to compare quotes.
Read guide →Loft Conversion Near Me 2026: How to Choose a Specialist (UK)
There is no honest national ranking of loft conversion firms. What protects you is checking FMB and TrustMark registration, a chartered structural engineer's design, Building Regulations sign-off and clear written…
Read guide →How to Plan a Loft Conversion for a Semi 2026 UK: 5 Steps
Planning a semi loft conversion means checking head height (aim for 2.2m+), choosing rooflight, dormer or hip-to-gable, serving a party wall notice on your attached neighbour, meeting building regs, and budgeting…
Read guide →How to Plan a Loft Conversion for Over-60s 2026 (UK Guide)
How to plan a loft conversion for the over-60s in 2026 UK - the 6 planning steps, safe stair and handrail design, a low-threshold en-suite, better lighting and future-proofing, plus building-regs and cost guidance for a…
Read guide →Loft Dormer Planning Permission 2026: Do You Need It?
Most rear loft dormers in the UK fall under Permitted Development (under 50m³ for detached/semi, 40m³ for terraces) — but front dormers, conservation areas, and Article 4 zones still need planning. Here's the 2026…
Read guide →How to Plan a Loft Conversion Bathroom 2026 (UK Guide)
Plan a loft en-suite in 7 steps: find the soil stack first, check head height where the shower actually goes, and confirm water pressure before you sign. Typical cost £4,000–£9,000 on top of the conversion.
Read guide →How to Plan a Loft Conversion for a Terraced House UK 2026
How to plan a loft conversion for a terraced house in 2026 UK — a step-by-step guide. Covers the headroom check that decides feasibility, choosing between a rear dormer and a mansard, the party wall agreements you will…
Read guide →Solar vs Loft Conversion: Which Adds More Value? UK 2026
Solar panels versus a loft conversion — which adds more value to a UK home in 2026? They are not really competitors: a loft conversion adds substantial capital value (10–20%) while solar adds little to price but cuts…
Read guide →Is a Loft Conversion Cheaper Than an Extension? UK 2026
Yes — by roughly £15,000–£40,000 in 2026 UK . A typical dormer loft conversion lands at £45,000–£70,000; an equivalent single-storey rear extension at £60,000–£110,000. But the right answer depends on three things: how…
Read guide →Attic Conversion Cost UK 2026: Is It Different from a Loft?
2026 UK guide explaining what UK builders mean by 'attic conversion' vs 'loft conversion' — they're not identical — with full cost breakdown for both, why the terminology affects build cost and planning permission, and…
Read guide →How to Plan a Flat Roof Dormer Step by Step UK 2026
To plan a flat roof dormer in 2026 UK , first check your remaining permitted development volume ( 40 m³ terraced, 50 m³ semi/detached), then confirm you have 2.2 m of ridge height to work with. Serve Party Wall notices…
Read guide →How to Plan a Loft Conversion for a Flat UK 2026
To plan a loft conversion for a flat in 2026 UK , you must be in the top-floor flat and own (or buy) the roof airspace — most leaseholders need freeholder consent and a lease variation. You'll then need full planning…
Read guide →Loft Insulation Grants UK 2026: Up to £1,500 Free
2026 UK guide to free and subsidised loft insulation — which grants cover it (ECO4, Great British Insulation Scheme, local council schemes), eligibility rules, real costs with and without funding, plus how to spot…
Read guide →Is a Dormer Loft Conversion Worth It? UK 2026 ROI
Yes — in 2026 UK , a dormer loft conversion is one of the highest-ROI home extensions you can do. Typical cost £45,000–£85,000 adds 20–25% to property value (130–170% ROI) and creates a full double-bedroom-plus-ensuite…
Read guide →How to Find a Good Loft Conversion Builder UK 2026
Finding a good loft conversion builder in 2026 UK comes down to 8 things: FMB or TrustMark membership , 3 written quotes , 2 recent references , own structural engineer , party wall notices , JCT contract , staged…
Read guide →Garage Loft Conversion Cost UK 2026
Real UK garage loft conversion cost in 2026 (combining a garage conversion with the loft above): single garage £15,000-£25,000, integral £20,000-£35,000, double garage £28,000-£45,000.
Read guide →Is a Hip-to-Gable Loft Conversion Worth It? UK 2026
In 2026 UK , a hip-to-gable loft conversion costs £42,000–£68,000 and typically adds £30,000–£60,000 to a semi-detached or end-terrace home — a 60–110% ROI depending on region. Almost always worth it in London, the…
Read guide →How Much Value Does a Loft Conversion Add? 20–25%
A 2026 UK loft conversion typically adds 20–25% to property value — £50,000–£120,000 in cash. See how the four conversion types compare, regional value uplift data, and the 6 decisions that change the uplift by £10,000+.
Read guide →Do I Need Planning Permission for a Loft Balcony? (2026 UK)
In most cases a loft balcony you can walk out onto (a roof terrace) needs full planning permission in 2026, because balconies and roof terraces are excluded from permitted development. A Juliet balcony with no standing…
Read guide →How Much Does a Dormer Window Cost in 2026? (UK Prices)
A dormer window in the UK costs roughly £4,000–£12,000 supplied and fitted in 2026 for the dormer box alone, or £40,000–£75,000 as part of a full dormer loft conversion. Roof type, size and structural work drive most of…
Read guide →How Long Does a Loft Conversion Last? UK 2026 Guide
2026 UK insight: a properly built loft conversion easily outlives its mortgage — 50–80+ years. Most early failures are roof tie-in or vapour-control errors that show up by year 5–10.
Read guide →Is a Velux Loft Conversion Worth It? UK 2026 ROI
2026 UK analysis: when a Velux (rooflight-only) loft conversion is the right call vs dormer or hip-to-gable — real cost, ROI, headroom rules, planning advantages and where homeowners regret the choice.
Read guide →Dormer Loft Conversion Cost UK 2026
Real UK dormer loft conversion cost in 2026: single dormer £30,000-£45,000, double dormer £45,000-£65,000, hip-to-gable plus dormer £50,000-£70,000. £1,500-£2,500/m² typical.
Read guide →Average Cost of a Loft Conversion 2026 (UK)
The average UK loft conversion costs about £45,000 in 2026, but the range runs £25,000–£100,000 depending on type. Why a single average is the wrong number to plan with, and what to use instead.
Read guide →Hip-to-Gable Loft Conversion Cost UK 2026: £42k–£68k
A UK hip-to-gable loft conversion costs £42,000–£68,000 in 2026 — straight gable build, plus rear dormer £8k–£14k. Full breakdown by region, scope and a real Birmingham example.
Read guide →Is a Mansard Loft Conversion Worth It? UK 2026
A mansard loft conversion is worth it in 2026 for most London terraces and inner-city semis: average ROI is 18-26% on the property value, payback 6-9 years, and you typically add 25-40% to the usable floor area. Outside…
Read guide →Loft Conversion Cost Per m2 2026 (UK Rates)
A 2026 breakdown of UK loft conversion costs per square metre by conversion type, why the rate falls as floor area rises, and the factors that decide where your project sits in the range.
Read guide →Best Loft Conversion Specialists UK: How to Choose (2026)
A 2026 buyer's guide to choosing a loft conversion specialist in the UK: the accreditations that carry weight, how to compare quotes properly, the questions to ask and the warning signs to walk away from.
Read guide →Loft Conversion Stairs: Rules & Costs (2026 UK)
A 2026 UK guide to loft conversion stairs: the Part K rules on rise, going and headroom, the Part B fire requirements for a three-storey home, space-saving options and what a staircase really costs.
Read guide →Extension vs Loft Conversion: Which Costs Less? UK 2026
A loft conversion almost always costs less: £30,000–£70,000 against £35,000–£90,000 for a single-storey extension in 2026. The gap is clearest per square metre — £1,250–£1,800/m² for a loft against £2,100–£3,000/m² for…
Read guide →Dormer vs Velux Loft Conversion Cost UK 2026: Side-by-Side
Dormer vs Velux — side-by-side cost, headroom, planning, ROI and resale value comparison for UK 2026 loft conversions. Includes a worked decision matrix.
Read guide →Do I Need Planning Permission for a Mansard? UK 2026
A mansard loft conversion almost always needs full planning permission in 2026 UK — front mansards, conservation areas, listed buildings and Article 4 zones all require an application. Only purely rear mansards on…
Read guide →Hip to Gable Loft Conversion Cost UK 2026
Real UK hip-to-gable loft conversion cost in 2026: semi-detached from £33,000, detached £40,000-£55,000, hip-to-gable + rear dormer £55,000-£70,000. £1,800-£2,700/m² typical.
Read guide →How to Get Planning Permission for a Loft Conversion UK
How to get planning permission for a UK loft conversion in 2026: 7-step process, PD vs full application, dormer 40/50m³ limits, listed building, conservation area, costs & timeline.
Read guide →How to Choose a Loft Conversion Builder UK 2026
How to compare and choose a UK loft conversion builder in 2026: 9 vetting checks, FMB/TrustMark cert, fixed-price contract, reference visits & 10-yr warranty.
Read guide →Loft Conversion vs Extension: Which Is Quicker in 2026? (UK)
Which is quicker to build in 2026 - a loft conversion or a single-storey extension? We compare on-site build time, total programme, disruption, cost and planning route side by side, with a stage-by-stage timeline table…
Read guide →How to Plan a Victorian Loft Conversion in 2026 (UK Guide)
A practical step-by-step plan for converting the loft of a Victorian terrace or semi in 2026. Covers the cut/purlin roof advantage, the marginal 2.2–2.4m head-height reality, choosing between Velux, rear dormer, the…
Read guide →Do I Need Planning Permission for a Rear Dormer? UK
Most rear dormer loft conversions in 2026 fall under Permitted Development — no planning permission needed if within 50m³ (40m³ terrace), set back 200mm from eaves, and below the existing ridge. Article 4 areas…
Read guide →Kitchen Extension vs Loft Conversion: Which Adds Value?
Loft conversions deliver the higher 2026 ROI (£58k average cost, +20% home value, 145% return), but kitchen extensions remain top for liveability (£45k cost, +9% value, 78% return). Here's the head-to-head: cost, ROI…
Read guide →Loft Conversion Cost Per m² UK 2026
Real UK loft conversion cost per m² in 2026: Velux £1,200-£1,800/m², dormer £1,500-£2,500/m², hip-to-gable £1,800-£2,700/m², mansard £2,000-£3,000/m². Per-m² calculator and worked examples.
Read guide →Terraced House Loft Conversion Cost 2026 (UK)
How much a terraced house loft conversion costs in 2026: typical £27,500–£75,000+ by type (Velux, dormer, mansard), what drives price, party wall costs and how to get accurate local quotes.
Read guide →Loft Conversion vs Moving House: UK Costs 2026
Is a loft conversion cheaper than moving house in 2026? Compare UK costs, fees, timelines and ROI. Get a fixed-quote loft conversion estimate today.
Read guide →Terrace House Loft Conversion Cost 2026
A terraced-house loft conversion costs £30,000–£85,000 in 2026: Velux £30k–£50k, rear dormer £45k–£70k, L-shaped dormer £55k–£80k, mansard £55k–£85k (UK averages; London and the South East 20–40% higher). Mid-terrace…
Read guide →How to Plan a Victorian Loft Conversion in 2026 UK
Planning a loft conversion for a Victorian house in 2026 means seven steps: check head height (~2.2-2.3m under the ridge), check planning constraints (conservation areas and Article 4 often remove permitted…
Read guide →Loft Room Planning Permission UK 2026: PD Volume Limits
Most UK loft conversions can be built under Permitted Development without a full planning application — but four specific scenarios do require permission, and getting it wrong means a £30,000+ rebuild order. The 2026…
Read guide →Is a Loft Conversion Cheaper Than Moving House? UK 2026
In 2026 UK, a loft conversion typically costs £45,000–£75,000 against £35,000–£60,000 in moving costs (stamp duty, agent, legals, removals) for a like-for-like up-size. On homes priced £400k+ moving is rarely cheaper…
Read guide →How to Plan a Loft Conversion for a Bungalow UK 2026
Bungalows are some of the best candidates for a loft conversion — a large, simple roof void over the whole footprint — but they bring two specific challenges: finding head height under a shallow pitch, and fitting a…
Read guide →J-Shaped Loft Conversion Cost UK 2026
A J-shaped (also called L-shaped) loft conversion typically costs £55,000–£95,000 fitted in 2026 — more than a single dormer because it combines two roof planes, usually over the main roof and the rear addition of a…
Read guide →How Long Does a Loft Conversion Take? UK 2026
A UK loft conversion in 2026 takes 6–14 weeks on site — Velux 5–7 weeks, dormer 7–9, hip-to-gable 8–11, mansard 10–14. This insights guide breaks down the week-by-week schedule and the six factors that cause delays.
Read guide →Compare Loft Conversion Types UK 2026: Which Is Best?
VELUX rooflight conversions £18k–£32k offer the lowest entry but smallest gain; dormer £35k–£60k is the UK's most popular sweet spot; hip-to-gable £45k–£75k transforms semi-detached lofts; mansard £60k–£95k delivers the…
Read guide →Extension vs Loft Conversion: Which Is Faster? (2026)
A 2026 side-by-side comparison of loft conversions and single-storey extensions: build timelines, design and planning lead time, cost per square metre, value added and disruption, plus which is faster and better for…
Read guide →Do I Need Planning Permission for a Dormer? UK 2026
2026 UK dormer Permitted Development rules: 40 m³ terrace, 50 m³ semi/detached. Side 1.7m boundary, no front dormer. Application £258 + LDC £103. Process + scenarios.
Read guide →Is a Loft Conversion Worth It in 2026? UK ROI Guide
A 2026 UK loft conversion typically costs £45,000-£85,000 and adds 20-25% to property value. See region-by-region ROI, when it's worth going ahead, and when to pass.
Read guide →Do I Need Planning Permission for a Loft Conversion?
Most loft conversions in the UK fall under Permitted Development rights in 2026 and don't need planning permission. Full rules, exceptions, and when you do need planning.
Read guide →Loft Conversion vs Extension: Which Adds Value? UK 2026
Torn between a loft conversion and an extension in 2026? A loft conversion with a double bedroom and en-suite can add up to ~20% to your home's value, while a single-storey extension typically adds 5–12% — but the right…
Read guide →Loft Conversion Cost in Summer 2026 UK
Wondering what a loft conversion costs in summer 2026 ? Expect roughly £25,000–£75,000 depending on conversion type, with summer quotes typically 3–8% higher than winter because installer order books are full. This…
Read guide →How to Plan a Loft Conversion for a Flat Roof in 2026
Step-by-step 2026 guide to planning a flat-roof loft conversion: checking feasibility and headroom, the structural approach, flat-roof dormers, Building Regs, realistic costs and timeline. Get 3 free quotes.
Read guide →Do I Need Planning Permission for a Two-Storey Rear Dormer in 2026?
Most rear loft dormers are Permitted Development in 2026 if within 50m³ (40m³ terraced) and set back from the eaves. A genuine two-storey rear addition needs full planning. Full rules, limits and how to confirm.
Read guide →Semi-Detached Loft Conversion Cost UK 2026
Full 2026 UK semi-detached loft conversion cost guide. Velux from £28,000, dormer £45,000–£65,000, hip-to-gable £52,000–£78,000. Includes per-m² rates, Party Wall costs and planning rules.
Read guide →How to Plan a Loft Conversion Staircase in 2026 (UK Step-by-Step)
Plan a loft conversion staircase by checking headroom first: Building Regs Part K requires 2m over the stairs, relaxed to 1.9m centre and 1.8m at the edge under a sloping loft roof. Stack the new flight over the…
Read guide →How Much Does a Terraced Loft Conversion Cost in 2026? (UK)
A terraced loft conversion in 2026 typically costs £25,000–£40,000 for a rooflight (Velux) conversion, £45,000–£65,000 for a rear dormer and £55,000–£80,000 for a mansard. Restricted access, party walls on both sides…
Read guide →How to Plan a Loft Conversion for a Detached House (2026 UK)
Planning a loft conversion for a detached house in 2026 comes down to six steps: check head height and feasibility, confirm your generous 50m³ permitted development allowance, choose the right design (dormer…
Read guide →How to Plan a Loft Conversion for a Semi-Detached (2026 UK)
Planning a loft conversion for a semi-detached house in 2026 comes down to six steps: check you have enough head height, confirm your permitted development allowance (50m³ for a semi), design the conversion and dormer…
Read guide →Do I Need Planning Permission for a Loft Terrace? (2026 UK)
Do you need planning permission for a loft terrace in 2026? Almost always yes. While many loft conversions are permitted development, balconies, roof terraces and raised platforms are specifically excluded — so adding a…
Read guide →Extension vs Loft Conversion 2026: Which Is Cheaper? (UK)
Torn between an extension and a loft conversion in 2026? A rooflight loft conversion typically starts around £25,000 while a single-storey rear extension usually begins near £40,000 — but added space, value uplift…
Read guide →Do I Need Planning Permission for a Loft Extension? 2026 (UK)
Most loft extensions in 2026 do NOT need full planning permission — they fall under Permitted Development if they stay within the volume limits (40m³ terrace / 50m³ semi or detached) and follow the design rules. Here is…
Read guide →How to Plan a Rear Dormer Step by Step (2026 UK)
Planning a rear dormer loft conversion in 2026 comes down to six steps: check the head height and feasibility, confirm permitted development or planning, design the dormer and windows, get the structural design through…
Read guide →How to Plan a Loft Conversion in a Bungalow 2026 (UK Guide)
A bungalow is one of the best candidates for a loft conversion — a generous roof footprint and no upstairs neighbours to worry about. The two make-or-break factors are head height (you need around 2.2m at the ridge) and…
Read guide →Compare Loft Conversion Quotes 2026 — How Many Should You Get?
Get exactly three loft conversion quotes in 2026 — enough to spot a fair price and an outlier, without dragging the process out for weeks. The trick is comparing like-for-like on the written specification, not just the…
Read guide →How to Plan a Hip-to-Gable Loft Conversion (2026 UK)
Planning a hip-to-gable loft conversion in 2026? Follow this 9-step framework: check suitability, run feasibility, choose your planning route, commission structural design, hire a builder, serve Party Wall notices, sign…
Read guide →Loft Conversion Cost Winter 2026: £27k–£75k
A UK loft conversion in winter 2026 costs £27,000–£40,000 for a rooflight/Velux, £40,000–£55,000 for a dormer and £55,000–£75,000 for a hip-to-gable or mansard — and winter often shaves 5–12% off through off-peak…
Read guide →Flat Roof Dormer Cost UK 2026: £18k–£42k
A UK flat roof dormer in 2026 costs £18,000–£28,000 for a single rear dormer (5–7m²) and £30,000–£42,000 for a full-width or double (10–14m²) — typically £2,200–£3,000 per m² of new headroom. Here's the real cost ladder…
Read guide →Is a Loft Conversion Cheaper in Summer? UK 2026
Is a loft conversion cheaper in summer in 2026? The headline build cost barely moves with the season, but summer brings faster, drier builds at peak demand, while autumn and winter often unlock better builder…
Read guide →Flat Roof Dormer Cost Per m² UK 2026
A flat roof dormer is the most cost-effective way to add headroom and floor space in a loft. In 2026 UK it costs roughly GBP 1,500 to GBP 2,500 per square metre of new floor - about GBP 4,000 to GBP 10,000 for a single…
Read guide →Do I Need Planning Permission for a Two-Storey Loft? (2026)
Most loft conversions are permitted development, but a two-storey loft that raises the roofline, adds a front-facing dormer or exceeds the 40–50m³ volume limit usually needs full planning permission. Building…
Read guide →How to Plan a Loft Conversion for Over-50s in 2026 (UK)
An over-50s loft conversion is about future-proofing, access and running costs. Seven steps: fix the purpose, check head height and stairs, design stairlift-ready access, insulate to Part L, confirm planning, finance…
Read guide →How Much Does an L-Shaped Loft Conversion Cost in 2026? (UK)
L-shaped loft conversions in 2026 UK cost £58k-£95k. London adds 30-40%, en-suite bathrooms add £6k-£9k, structural steel work is the single biggest cost driver.
Read guide →How to Plan a Loft Conversion for a Terraced House in 2026 (UK)
Terraced loft conversions in 2026 UK take 8-12 weeks. Get the Party Wall Act notice out first, confirm 2.2m head height, pick dormer or hip-to-gable - then design around the staircase.
Read guide →How to Plan a Loft Conversion Step by Step 2026 (UK)
Planning a UK loft conversion in 2026 in 8 steps: check head height, choose conversion type, confirm permissions, get architectural drawings, structural calcs, find a builder, schedule building control, and protect…
Read guide →How Much Does a Loft Conversion Cost Per m² in 2026? (UK Price Guide)
A UK loft conversion in 2026 typically costs £1,150–£2,600 per m² fitted depending on type — a rooflight conversion is cheapest, a mansard the priciest. Full breakdown by conversion type, floor area and extras.
Read guide →How Much Does a Loft Dormer Cost Per m² in 2026? (UK Price Guide)
A UK loft dormer in 2026 typically costs £2,100-£3,000 per m² fitted - around £17,000-£24,000 for a popular 8m² flat-roof box dormer. Full breakdown by size, roof finish, glazing and structural opening.
Read guide →Is a Loft Conversion VAT Free in 2026? (UK)
A standard loft conversion in the UK in 2026 is not VAT-free - 20% VAT applies. The reduced 5% rate is reserved for conversions creating new dwellings or homes empty 2+ years.
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