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Roof Cost Calculator (UK)

Estimate the full installed cost of a roof replacement in the UK in 2026: concrete tile, clay tile, natural slate, felt, and metal — itemised by material, labour, strip-off, skip hire, and Building Regs.

Roof Cost Calculator

Estimate the full installed cost of a sloped-roof replacement, broken down by material, labour, tear-off, disposal, underlay, and gutters. Currency and pricing are matched to your selected locale.

Total installed cost
£11,155
£101/m² · 110 m² total
Annualised over 50-year service life: £223/yr (Concrete tile)
Material
£2,614
Labour
£5,126
Tear-off
£1,339
Disposal
£1,016
Underlay
£708
Gutters
£0
Permit + misc
£351
Slope factor
1.122

What this calculator does

This calculator gives you a full installed-cost estimate for replacing a sloped roof in the UK. It accounts for:

  • Material — concrete tiles, clay tiles (plain or interlocking), natural slate (Welsh, Spanish, or Brazilian), wood shingles, single-ply membrane, and metal sheet
  • Labour — adjusted for pitch (steeper = slower) and roof complexity (more valleys, dormers, hips = slower)
  • Strip-off — single layer or stripping back to rafters
  • Skip hire and disposal — standard 8-yard skip for tiles, mini-skip for slate
  • Underlay — modern breather membrane or felt
  • Gutters — optional, by linear metre
  • Building Regs and miscellaneous — typically 3% of subtotal, minimum £450

How to use it

  1. Get the roof area — measure each roof slope’s area in m². If you only have plan footprint, multiply by the slope factor based on pitch (use our roof square footage calculator which handles this for you).
  2. Set the pitch — UK pitched roofs typically run 30°–45° (17.5°/12 to 12/12). Steeper pitches need more labour.
  3. Pick a material — concrete interlocking tile (Marley Modern, Redland Cambrian) is the default on UK new-builds. Clay plain tile is traditional in southern England. Welsh slate dominates conservation areas in Wales, the West, and the Lakes.
  4. Region — adjust for your local labour market. London and the South East: 25–35% above national. South West, East Midlands: at or near average. North East, North Wales, Scotland: 10–15% below.
  5. Complexity — a simple terraced or semi gable is “simple”. Two dormers and a chimney is “moderate”. A complex roof with multiple gables, hips, valleys, and stack chases is “complex” and adds 12–28% in labour.
  6. Strip-off, underlay, gutters — toggle and quantify.

Typical 2026 installed cost ranges (mid-cost region, 90 m² semi)

Material£/m² installedTotal cost (90 m²)Service life
Concrete interlocking tile£75–£110£6,500–£10,00050+ yrs
Concrete plain tile£85–£125£7,500–£11,50050+ yrs
Clay interlocking tile£105–£150£9,000–£13,50075+ yrs
Clay plain tile£130–£190£11,500–£17,00075+ yrs
Welsh slate£180–£280£16,000–£25,000100+ yrs
Spanish slate£150–£210£13,500–£19,00080+ yrs
Cedar shingle£140–£195£12,500–£17,50030 yrs
Single-ply membrane£75–£135£6,500–£12,00022 yrs
Standing-seam zinc£210–£310£19,000–£28,00080+ yrs

Sources: NFRC 2026 Members’ Pricing Index; Checkatrade Q1 2026 trade prices; MyBuilder regional cost data; BBA Agrément certificates for membrane systems; British Standards BS 5534 (slating and tiling) and BS 8000-6 (workmanship for roofing).

Cost drivers in detail

Roof area. Cost scales linearly per m², but very small roofs (under 25 m² — for example a single-storey extension) carry a mobilisation premium of £1,800–£2,800 due to scaffolding and skip hire fixed costs.

Pitch. A 22° (5/12) pitch is walkable for short periods. A 30° (7/12) pitch needs roof ladders. A 45° (12/12) pitch requires harnesses and roof jacks throughout, slowing the crew by 25–35%. Pitches under 15° are not suitable for tiles or slates and need a flat-roof system.

Strip-off. Stripping a single layer of tiles and felt: £8–£14 per m². Stripping back to rafters with rotten timber replacement: £18–£28 per m². Old asbestos cement tiles or slates require licensed removal — £55–£95 per m² with HSE-approved disposal.

Region. London and the South East: 25–35% premium. South West, Midlands, Yorkshire: at national average. North East, North Wales, Scotland (excluding Edinburgh): 10–15% below.

Roof complexity. A simple gable end terrace might re-roof in 2–3 days. The same area on a complex roof with two valleys, a hip, and a chimney stack might take 5–6 days for the same crew.

Listed Building consent. If your property is Listed (Grade I, II*, or II), the local conservation officer must approve the materials before work starts. This typically means matching the existing — natural slate stays natural slate, plain clay tile stays plain clay tile. Listed Building Consent applications take 8–12 weeks. Ignoring this is a criminal offence under the Planning (Listed Buildings and Conservation Areas) Act 1990.

Building Regs U-value. Approved Document L1B 2024 requires a U-value of 0.16 W/m²K when replacing 25%+ of the roof area. That’s 100mm PIR (Kingspan TR26 or Celotex GA4000) between rafters or 130mm of mineral wool. Insulation upgrade adds £35–£55 per m² for materials and labour.

Scaffolding. For an average semi: £600–£1,400 for the duration. Detached homes: £900–£2,000. Three-storey townhouses: £1,400–£3,200. The scaffold must be erected by a CISRS-carded scaffolder and inspected weekly.

Tile vs slate vs membrane — which to pick

Concrete interlocking tiles (Marley Modern, Redland 49, Sandtoft Calderdale) are the workhorse of UK roofing. Reliable, widely available, easy to source replacements, BS EN 490 certified. 50+ year life. Best for: 1930s and later semis and detached homes, new-builds, and any project where you want a wide choice of installers.

Clay plain tiles (Sandtoft 20×20, Marley Acme, Dreadnought) are the traditional southern-England roof. Smaller tiles, more of them, more labour to lay — but unmatched character on Cotswold, Sussex, and Kent properties. 75+ year life. Best for: pre-1930 properties, conservation areas, and renovations matching original materials.

Natural Welsh slate (Penrhyn, Cambrian, Burlington) is the gold standard — 100+ year life, BS EN 12326-1 graded T1 (highest weathering classification), and the only material approved by some local conservation officers in Wales, the Lakes, and parts of Cornwall. 2× to 3× the cost of concrete tile.

Spanish slate (Cupa, Del Carmen) is a like-for-like alternative to Welsh slate at 60–70% of the cost. Quality varies by source — pick CE-marked T1 grade only.

Single-ply membrane (Sika Sarnafil, IKO, Bauder) is the modern flat-roof default for extensions, garages, and porches. EPDM rubber, FPO/TPO, or PVC. 20–30 year life.

Standing-seam zinc (VMZinc, RheinZink) is the contemporary premium pick. Common on new-build extensions and high-end renovations. 80+ year life. Develops a natural patina.

Common gotchas that blow the budget

Rotten roof timbers. UK roofs from the 1960s–1980s often have undersized rafters and battens by current standards. Once stripped, expect 5–15% of timber to need replacement — £4–£8 per m² extra.

Dry rot or wet rot in eaves. Years of failed eaves felt allows water into wall plates and rafter feet. Discovered at strip-off. £400–£1,200 to splice in new ends and treat.

Lead flashing replacement. Old lead flashings should be replaced (not reused) at every re-roof. New Code 4 lead chimney flashing kit: £350–£650 installed. Code 5 for valleys and parapets: £85–£140 per linear metre.

Chimney repointing. Once the scaffold’s up, it’s the only chance for the next 30 years. Repoint a single chimney stack: £350–£700. Pulling down and rebuilding a damaged stack: £1,800–£3,500.

Insulation upgrade. Approved Document L requires 0.16 W/m²K when re-roofing 25%+. If your loft is unconverted with no existing insulation, expect £1,800–£3,500 for full conformance — sometimes done as warm roof (PIR above rafters), sometimes as cold roof (mineral wool between joists).

Solar panel re-fix. If you have solar PV, the panels must be removed and reinstalled — your installer charges typically £85–£150 per panel. A 12-panel array adds £1,000–£1,800.

When to repair vs replace

Repair makes sense if:

  • Tiles or slates are slipping due to a localised failure (broken nibs, broken nails)
  • Damage is to a single area (one valley, one chimney, one ridge)
  • The underfelt is sound elsewhere (under 25 years old)
  • Less than 15% of the roof area shows issues

Replace if:

  • Underfelt is past 30 years (typical UK failure point)
  • Multiple slipped/missing tiles across the roof
  • Mortar bedding on ridges and verges has failed extensively
  • Repeated repairs haven’t held
  • You’re approaching the 25% threshold for Building Regs anyway

Sources: NFRC 2026 Members’ Pricing Index; BS 5534:2014+A2:2018 (Code of practice for slating and tiling); BS 8000-6:2013 (Workmanship for roof coverings); Approved Document L1B 2024 (Conservation of fuel and power); BS EN 490, BS EN 1304, BS EN 12326-1 product standards; Checkatrade Q1 2026 trade pricing; MyBuilder regional cost data 2026.

Frequently asked questions

How much does a new roof cost in the UK in 2026?
A full re-roof on a typical UK three-bedroom semi (about 90 m² of roof area) costs £6,500 to £11,500 in concrete tiles, £8,500 to £14,500 in clay tiles, and £14,000 to £24,000 in natural Welsh slate. Labour is £80 to £140 per m² depending on region and access. London and the South East run 25–35% above the UK average; the North East, North Wales, and Scotland sit 10–15% below. Source: NFRC 2026 Members' Pricing Index + Checkatrade Q1 2026 data.
Do I need Building Regulations approval for a re-roof?
If you're replacing 25% or more of the roof area, the work is notifiable under Approved Document L1B and the new roof must meet the current U-value of 0.16 W/m²K — typically achieved with 100mm of PIR insulation between or above the rafters. A Building Notice to your local authority Building Control or sign-off through a Competent Person scheme (Stroma, NICEIC) is required. A like-for-like repair under 25% does not need Building Regs but should still match BS 5534 fixing requirements.
What's the difference between concrete and clay tiles?
Concrete tiles cost £0.95 to £1.60 per tile and weigh 4.5–5.0 kg each. They last 50+ years but the surface can chalk and lose colour after 20–25 years. Clay tiles (plain or interlocking) cost £1.40 to £3.20 per tile and weigh 1.8–2.5 kg each. Clay holds its colour for 75–100 years and is the traditional choice in conservation areas and Listed Buildings. Both meet BS EN 490 and BS EN 1304 respectively.
How long should a UK roof last?
Concrete tiles last 50–60 years; the underfelt typically fails first at 35–45 years. Clay tiles last 75–100 years; underfelt at 35–45 years. Natural Welsh and Spanish slate lasts 100+ years. Single-ply felt (mineral cap sheet) lasts 15–20 years. Lead flashings last 100+ years. The first thing to fail on most UK roofs is the underfelt and battens — slipping tiles point to a failed underfelt, not bad tiles.
Do I need scaffolding for a re-roof?
Yes, almost always. CDM 2015 regulations and HSE guidance (the 'Working at Height' regulations) require edge protection for any roof work on a domestic property over 4m high. Scaffolding hire for an average semi runs £600–£1,400 for the duration of the job. Some roofers offer 'Twin-Wall' platform-and-boom kits for very small jobs that come in cheaper, but for a full re-roof scaffold is mandatory.
Will my buildings insurance cover a new roof?
Insurance covers roof replacement only if the damage is from a covered peril — storm damage, fallen tree, fire. Wear and tear, age-related failure, and gradual damage from poor maintenance are excluded. UK insurers typically depreciate the payout heavily on roofs over 25 years old. The Association of British Insurers' guidance is that a roof in 'normal' wear is the homeowner's responsibility; a sudden weather event triggers cover. Get a roof condition report before claiming.
Should I replace the underfelt and battens too?
Yes, always. There's no economic case for relaying old tiles or slates back over a 30+ year old underfelt — you'll be back on scaffold within 5 years. NFRC strongly recommends replacing underfelt (now typically 'breather membrane' such as Tyvek Supro or Klober Permo) and battens (graded TR26 or higher) at every re-roof. The marginal cost is £8–£14 per m² for membrane and £4–£7 per m² for battens — a small fraction of the total job.
What's the cheapest type of roof in the UK?
For pitched roofs, second-hand reclaimed concrete tiles relaid on new battens and breather membrane are the cheapest at £55–£75 per m² installed. New concrete tiles with new fixings run £75–£110 per m². For flat roof areas, EPDM rubber sheet at £75–£120 per m² is the cheapest long-life option. GRP fibreglass and felt mineral cap sheet are cheaper upfront but last only 20 years.

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