⌂ RoofingCalculatorHQ

Composite Roof Cost Calculator

Estimate 2026 UK composite (synthetic slate, shake, and polymer tile) roof installation cost by line item: DaVinci Roofscapes, EcoStar by Carlisle SynTec, Brava, Inspire, or F-Wave REVIA composite roofing, Class A reaction to fire and Class 4 impact rated, with strip-out, BBA-certified breather membrane, hip and ridge, code 4 lead or zinc valley, soil pipe and rooflight flashings, Building Control notification, and skip disposal. Real 2026 NFRC distributor rates.

Composite Roof Cost Calculator

2026 UK synthetic slate and shake roof cost by line item — DaVinci Roofscapes, EcoStar, Brava, Inspire or F-Wave composite polymer roofing, Class A fire and Class 4 impact rated, with strip-out, breather membrane, hip and ridge, code 4 lead or zinc valley, soil pipe and rooflight flashings, Building Control notification and skip disposal. 2026 NFRC distributor rates (SIG Roofing, JJ Roofing, Roofing Megastore).

Estimated composite roof cost
£332,640
Range: £282,744 – £399,168
composite + strip + underlay + ridge + valley + penetrations + add-ons
Composite installed
£259,600
Strip-out
£48,400
Underlay
£14,400
Hip & ridge
£3,040
Valley
£3,120
Flashings
£580

What this calculator estimates

This calculator gives you a line-by-line installed 2026 UK price for a composite (synthetic slate, polymer shingle, or synthetic clay-tile) roof, whether you are speccing DaVinci Roofscapes (the leader by NFRC member spec), EcoStar by Carlisle SynTec (BREEAM choice), Brava Roof Tile (lightest), Inspire by Boral (architect specified), or F-Wave REVIA (budget). The calculator follows the line-item structure that NFRC member contractors use on real quotes:

  • Composite material — selected by profile (synthetic slate, cedar-look shingle, or synthetic clay tile), brand, and thickness/pattern
  • Strip-out — removing the existing roof down to the deck
  • Breather underlay — full-deck BBA-certified vapour-permeable underlay (Tyvek Supro, Klober Permo Forte, Cromar Vent 3)
  • Hip and ridge cap — matched composite cap per linear foot
  • Code 4 lead or zinc valley flashing — BS EN 12588 lead or pre-painted zinc per linear foot
  • Soil pipe and rooflight flashings — per-unit pre-formed kits including Velux Smart Flash
  • Building Control notification, skip disposal, and weekend premium

A £480 minimum call-out fee applies in most UK composite markets — even small composite repairs need a manufacturer-certified installer, scaffold (where required), and a colour-matched bundle delivered.

How to use it

  1. Enter roof area in m². For a typical UK detached house this is 100 to 180 m², semis 65 to 110 m², terraces 55 to 80 m².
  2. Pick profile — synthetic slate (most common UK choice), cedar-look shingle, or synthetic clay tile.
  3. Pick brand — DaVinci (default), EcoStar, Brava, Inspire, F-Wave REVIA, or generic value-tier (Tapco, Cedral, etc.).
  4. Pick thickness/pattern — single-thickness, multi-width staggered (default), or premium thick.
  5. Set scope — spot repair (15% of area), partial replace (45%), or full re-cover (100%).
  6. Set storey count — single-storey 1.0x, two-storey 1.2x, three-storey 1.45x.
  7. Set access difficulty — easy (front / driveway) is 1.0x, moderate (rear / side garden) 1.1x, hard (terraced / no scaffold) 1.3x.
  8. Enter hip & ridge cap and code 4 lead or zinc valley in linear feet, and soil pipe/rooflight penetrations count.
  9. Toggle strip-out, breather underlay, Building Control notification, skip disposal, and weekend premium, plus any extra labour hours.

Typical 2026 UK composite roof cost ranges

These ranges reflect 2026 nationwide pricing from NFRC member contractors, SIG Roofing, JJ Roofing, Roofing Megastore, and Q1 2026 quotes from London (Zones 1 to 6), Manchester, Bristol, Edinburgh, Cardiff, and Birmingham.

Composite system (150 m², single-storey, moderate access)2026 installed price
DaVinci Multi-Width Slate£20,500 – £28,000
DaVinci Bellaforte Slate (locking panel)£19,000 – £26,000
DaVinci Single-Width Slate (premium thick)£25,500 – £34,000
EcoStar Majestic Slate (Carlisle)£18,500 – £25,500
Brava Old World Slate£17,500 – £24,500
Brava Spanish Barrel Tile£20,500 – £27,500
Inspire Classic Slate (Boral / Westlake Royal)£19,500 – £26,500
F-Wave REVIA Slate£15,500 – £22,500
Generic / value-tier polymer tile (Tapco, Cedral)£12,500 – £19,000
Composite cedar-look shingle-8% vs slate equivalent
Spot composite repair (15%)£3,200 – £5,400
Hip & ridge cap per linear foot£36 – £42
Code 4 lead valley per linear foot£48 – £58

Add 20 percent for two-storey, 45 percent for three-storey or higher. Add 10 to 30 percent for moderate to hard access. London zones 1 to 3 carry a 12 to 18 percent uplift.

Cost drivers

Brand premium. DaVinci sets the ceiling and the spec standard for NFRC member contractors. EcoStar tracks 8 percent below DaVinci with 80 percent post-industrial recycled content (preferred for BREEAM). Brava and Inspire track within 5 percent of EcoStar. F-Wave REVIA undercuts DaVinci by about 22 percent. Generic UK polymer-tile brands (Tapco, Cedral) can be 30 to 45 percent below DaVinci but typically carry a 30-year warranty instead of 50 and have shallower dimensional detail.

Profile premium. Synthetic slate (the default) is the baseline. Cedar-look shingle is about 8 percent cheaper. Synthetic Spanish/barrel tile is 5 percent more expensive because of double-curve moulding tolerances — Brava leads this profile, but it is rare in the UK outside Mediterranean-styled new-build.

Thickness/pattern. Multi-Width Staggered Slate (default) gives the most realistic random Welsh-slate look at the baseline price. Single-Width Thick Slate adds 15 to 20 percent for premium dimensional appearance preferred on heritage and high-end custom homes (subject to Conservation Area consent). Single-thickness uniform is the value option, 10 to 14 percent cheaper.

Listed Building and Conservation Area status. Composite is typically refused for Listed Buildings under Section 7 Planning (Listed Buildings and Conservation Areas) Act 1990; Conservation Area consent under Article 4 Direction is also often refused. Check your local planning authority before committing to composite for any pre-1948 property. Historic England, Cadw (Wales), Historic Environment Scotland, and Historic Environment Division (NI) all prefer natural slate or natural clay tile for heritage sites.

Roof complexity. A simple 30-degree to 40-degree gable installs fast. Cut-up roofs with multiple dormers, valleys, hip-and-ridge transitions, and chimneys add 20 to 40 percent vs simple gable because every transition needs code 4 lead in linear feet and slows the crew.

Scaffold cost. Most two-storey jobs require a scaffold per CDM 2015 regulations — typically £1,800 to £3,400 for a 2-week hire on a semi-detached, £2,800 to £5,200 on a detached. Scaffold is separate from the roof price and not included in the calculator; add it to the total.

UK code, standards, and certifications

  • BS 5534 — Code of practice for slating and tiling for pitched roofs and vertical cladding (covers composite slate via Annex updates).
  • Approved Document A (Building Regulations) — Structure: confirms permissible imposed loads.
  • Approved Document B — Fire safety: composite carries Class A1 or B-s1,d0 (Euroclass).
  • Approved Document C — Site preparation and resistance to moisture: breather underlay requirements.
  • BBA Agrément Certificates — DaVinci 19/5621, EcoStar 17/5408, Brava 21/5712, Inspire 19/5594, F-Wave 22/5854 (verify current at bbacerts.co.uk).
  • NFRC Technical Bulletin 18 and 28 — Synthetic slate installation and exposed-site secondary protection.
  • BS EN 12588 — Code 4 lead sheet for valley flashings.
  • CDM 2015 — Construction (Design and Management) Regulations: scaffold and access requirements above 4 m.

Use an NFRC member contractor with manufacturer certification for any composite project — without certification the 50-year manufacturer warranty can be reduced to 30 years.

Diagnostic step-by-step before quoting

  1. Verify the deck and rafter spec — composite is half the weight of Welsh slate but cold-deck batten installs still need BS 5534 confirmation; warm-deck installs need additional condensation analysis.
  2. Check planning status — search your address on the local planning authority portal for Conservation Area or Article 4 Direction; check Listed Building status on Historic England, Cadw, HES, or Historic Environment Division NI databases.
  3. Confirm the BBA certificate is current — bbacerts.co.uk lists current certificates; some manufacturers had certificate updates in 2024 and 2025.
  4. Get three NFRC member bids that itemize composite brand and profile, breather underlay (manufacturer-specific), code 4 lead valleys, hip & ridge cap, soil pipe and rooflight flashings (Velux Smart Flash by size), scaffold, and skip as separate line items.
  5. Confirm manufacturer-certified-installer registration — without this, the 50-year warranty drops to 30 years on most brands.

Avoiding scams and overcharging

Door-knocker roofers occasionally push composite replacement after storm damage when only spot repair is needed. Red flags include claims that “the entire slate roof needs replacement” when only 3 to 8 slates need swapping (a common Welsh-slate failure mode that does not require composite at all), refusal to confirm the BBA certificate number, no NFRC membership, no proof of £2M public liability insurance, and cash-only or BACS-immediate demands. Reputable UK composite roofers in 2026 carry £5M public liability, £10M employers liability, are NFRC members, hold at least one manufacturer-certified-installer registration, and provide a TrustMark-registered workmanship warranty in writing. Verify NFRC membership at nfrc.co.uk and TrustMark at trustmark.org.uk.

Sources: 2026 DaVinci Roofscapes UK Distributor Spec Guide (SIG Roofing); 2026 EcoStar by Carlisle SynTec UK Pricing Sheet; 2026 Brava Roof Tile UK Pricing; 2026 Inspire by Boral UK Spec Guide; 2026 F-Wave REVIA UK Pricing; BS 5534; Approved Documents A, B, and C; BBA Agrément 19/5621, 17/5408, 21/5712, 19/5594, 22/5854; NFRC Technical Bulletin 18 and 28; BS EN 12588; CDM 2015; Q1 2026 quotes from London, Manchester, Bristol, Edinburgh, Cardiff, and Birmingham metros.

Frequently asked questions

How much does a composite roof cost in 2026 in the UK?
Most UK homeowners pay £120 to £180 per m² installed for a synthetic slate or polymer-tile composite roof in 2026, all-in with strip-out, BBA-certified breather underlay, hip and ridge cap, code 4 lead or zinc valley, soil pipe and rooflight flashings, and Building Control notification. A 150 m² detached home with DaVinci Bellaforte Slate lands around £19,000 to £27,500. EcoStar Majestic Slate is about 8 percent cheaper, Brava 10 to 12 percent cheaper, F-Wave REVIA roughly 22 percent cheaper. Generic polymer tile from Tapco or similar undercuts DaVinci by 30 to 40 percent but has a 30-year warranty instead of 50. Source: 2026 NFRC member contractor rates, SIG Roofing trade prices, JJ Roofing, and Roofing Megastore; Q1 2026 quotes from London, Manchester, Bristol, Edinburgh, and Cardiff.
Composite vs natural Welsh slate vs cedar shingle — which makes sense in the UK?
Composite makes sense when you want the appearance of slate or cedar shake without the weight, cost, or maintenance. Natural Welsh slate (Penrhyn, Ffestiniog) costs £180 to £260 per m² installed and is the heritage-correct choice for Listed buildings and Conservation Areas — but it is heavy (40 to 50 kg per m²) and requires confirming the roof structure to BS 5534. Composite synthetic slate weighs about half that (18 to 24 kg per m²) so usually installs on existing trusses. Cedar shingle is £150 to £220 per m² installed and has a 25 to 40-year UK service life vs composite's 50 years. Composite is also Class A (best) reaction to fire and Class 4 (highest) impact rated. The downside: composite is a polymer product, and Listed Building Consent or Conservation Area Consent typically requires natural slate — composite is rarely approved for heritage sites by Historic England, Cadw, or Historic Environment Scotland.
DaVinci vs EcoStar vs Brava vs Inspire vs F-Wave — which composite brand is best for UK roofs?
DaVinci Roofscapes (Kansas, USA, distributed UK by SIG Roofing) is the spec-leader — 50-year material warranty, Class A fire, Class 4 impact, made from 100 percent virgin polymer with the most realistic slate replication. EcoStar by Carlisle SynTec uses 80 percent post-industrial recycled rubber and plastic with a 50-year warranty — the leading choice for BREEAM and Home Quality Mark projects. Brava Roof Tile is the lightest composite at 8 to 9 kg per m² and pioneered the synthetic Spanish/barrel profile (rare in the UK but used on Mediterranean-styled homes). Inspire by Boral competes head-to-head with DaVinci. F-Wave REVIA is the budget option at 22 percent below DaVinci. For most UK homes wanting the closest visual match to Welsh slate, DaVinci Bellaforte Slate is the default. For BREEAM-certified projects, EcoStar.
Will Building Control or my insurer accept a composite roof in the UK?
Yes — both. Building Control accepts BBA-certified composite roof systems under Approved Document A (structure) and Approved Document B (fire) — all major brands (DaVinci, EcoStar, Brava, Inspire, F-Wave) hold valid BBA Agrément Certificates for the UK market. Reaction to fire is Class A1 or B-s1,d0 (Euroclass) — meeting Building Regulations for residential roofs of any size. UK home insurance treats composite as equivalent to natural slate for cover purposes — Direct Line, Aviva, LV=, Admiral, and Churchill all accept composite with no premium loading when the BBA certificate and installer registration are produced at policy inception. The exceptions are Listed Buildings (require Listed Building Consent — typically refused for composite) and Conservation Areas (often refused; Article 4 Direction sometimes blocks).
How long does composite installation take and what is the warranty?
A 150 m² (about 1,615 sq ft) single-storey full re-cover with DaVinci Multi-Width Slate takes 5 to 8 working days with a 3-person crew, weather permitting — about 25 percent faster than Welsh slate (which needs slate hooks and copper nails) and 15 percent faster than cedar shingle (which needs Cedar Breather mat). The standard manufacturer warranty is 50 years material on DaVinci, EcoStar, Inspire and F-Wave REVIA; Brava is lifetime limited. All major brands transfer to subsequent homeowners — a measurable resale-value asset. Installer workmanship warranty should be at least 10 years for an NFRC member; ask for the manufacturer-certified-installer registration number (DaVinci Masterpiece Contractor, EcoStar Premium Contractor, Brava Certified Installer) — without it, the 50-year manufacturer warranty can be reduced to 30 years.
What pitch and underlay does composite require in the UK?
Composite slate and shake require a minimum pitch of 20 degrees (4.4/12) per manufacturer specs and BS 5534, with some brands (DaVinci, Brava) approving down to 17.5 degrees (3.8/12) with double breather underlay. There is no practical maximum pitch — composite is used on church spires and Victorian turrets at 60 degrees or steeper. Full-deck BBA-certified breather underlay (Tyvek Supro, Klober Permo Forte, Cromar Vent 3) is required across the deck. In Scotland and exposed coastal sites, additional secondary protection at the eaves is recommended per NFRC TB 28. BS 5534 batten and counter-batten (38 x 25 mm minimum, treated) is required on cold-deck installs. Code 4 lead or zinc valley flashing (BS EN 12588 lead, NFRC code of practice) is standard for valleys.
Why is the soil pipe / rooflight flashing line item separate?
Pipe penetrations and rooflight flashings are a significant cost on the typical UK roof (3 to 8 penetrations including the soil vent pipe, the boiler flue, the bathroom extract, and 1 to 3 Velux rooflights) and the line item is brand-specific. DaVinci, EcoStar, and Brava all sell colour-matched composite pipe collars at £60 to £120 each fitted; Velux Smart Flash kits run £180 to £340 each fitted depending on rooflight size and tile pattern. Lump-sum quotes often hide these costs — the typical detached house at 4 to 5 penetrations adds £600 to £1,200 to the visible per-m² rate.
What is the difference between Bellaforte, Multi-Width, Single-Width, and Aledora?
These are the major composite slate profiles. DaVinci Multi-Width Slate (default) mimics 5 in, 7 in, 9 in, and 12 in real slate widths stacked randomly — most realistic, the spec-equivalent of random-width Welsh slate. DaVinci Single-Width Slate is uniform 12 in width, premium thick, 25 percent more expensive — the spec-equivalent of regular-graded Welsh slate. DaVinci Bellaforte Slate is a locking-panel system that installs 30 percent faster than Multi-Width with the same visual but slightly less random pattern — popular with installers, the fastest-growing spec in the UK NFRC member market. EcoStar Majestic Slate, Brava Old World Slate, Inspire Classic Slate, and F-Wave REVIA Slate are equivalents to DaVinci Multi-Width. For shake profile (UK cedar shingle equivalent): DaVinci Single-Width Shake, EcoStar Seneca Shake, Brava Cedar Shake, and Inspire Aledora Shake.

Related calculators