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Corrugated Metal Roof Cost Calculator

Estimate 2026 UK corrugated metal roof installation cost by line item: 0.7mm galvanised, 0.7mm Galvalume, Plastisol or PVDF colour-coated, 0.8mm heavy gauge, or polycarbonate corrugated sheeting, with strip-out, eave membrane, breather underlay, vented ridge, verge trim, valley gutter, Tek screws, drip edge, Building Control and skip disposal. Real 2026 NFRC contractor rates per BS 5427.

Corrugated Metal Roof Cost Calculator

2026 UK corrugated metal roof installation cost by line item — 0.7mm galvanised, 0.7mm Galvalume, Plastisol / PVDF colour-coated, 0.8mm heavy gauge, or corrugated polycarbonate. Includes strip-out, eave membrane, breather underlay, vented ridge, verge trim, valley gutter, capped side-lap screws, drip edge, Building Control and skip disposal. Real 2026 NFRC contractor rates per BS 5427.

Estimated corrugated metal roof cost
£184,060
Range: £156,451 – £220,872
panel + strip + eave membrane + underlay + ridge + verge + valley + fasteners + drip + add-ons
Panel installed
£121,000
Strip-out
£39,600
Eave membrane
£0
Underlay
£8,400
Vented ridge
£2,560
Verge trim
£1,320
Valley gutter
£1,680
Fasteners
£5,500
Drip edge
£600

What this calculator estimates

This calculator gives you a line-by-line installed 2026 UK price for a corrugated metal roof — whether you are re-roofing a farm building, replacing a shed, putting on a lean-to extension, sheltering an outbuilding, or specifying a new agricultural barn. It follows the same line-item structure NFRC member roofers use on real quotes:

  • Panel material — 0.7mm galvanised, 0.7mm Galvalume, Plastisol / PVDF colour-coated, 0.8mm heavy HPS200, or polycarbonate (installed)
  • Strip-out — removing the existing slates, tiles, asbestos cement (with appropriate licensing) or rusted metal down to the deck or purlins
  • Eave bituminous membrane — self-adhered membrane at eaves and valleys for fully-decked installations
  • Breather underlay — Tyvek, Klober Permo, or Cromar Vent 3 on the balance of the deck (skip for open-purlin)
  • Vented ridge cap — with profiled foam closure to allow loft ventilation through the corrugations
  • Verge / barge trim, valley gutter, capped Tek screw kit, eaves drip edge — pre-formed flashings and capped self-drilling screws
  • Building Control notification, skip disposal, and weekend premium

A £380 minimum call-out fee applies in most UK NFRC contractor catchments — Yorkshire, Lincolnshire, Norfolk, Devon and Powys — because even a single sheet replacement requires a two-person crew with snips, ladders, and a small skip.

How to use it

  1. Enter roof area in m². For a simple gable barn this is your wall footprint × 1.05 to 1.15. For a typical farmhouse it is 1.10 to 1.35x your ground floor footprint depending on pitch.
  2. Pick panel material — 0.7mm galvanised is the cheapest serviceable choice; 0.7mm Galvalume the agricultural and residential default; Plastisol or PVDF colour-coated if you want a 30-year colour warranty; 0.8mm HPS200 for exposed coastal sites; polycarbonate for translucent porch and lean-to roofs.
  3. Set scope — spot repair (15% of area), partial replace (45%), or full re-roof (100%).
  4. Set storey count — single-storey 1.0x, two-storey 1.2x, three-storey 1.45x.
  5. Set access difficulty — easy (front / driveway) 1.0x, moderate (rear / side garden) 1.1x, hard (terraced / no scaffold) 1.3x.
  6. Enter eave bituminous membrane area — typically 600mm inboard of eaves plus all valleys for a fully-decked installation. Leave at 0 for open-purlin.
  7. Enter linear feet of ridge, verge trim, valley gutter, side-lap Tek screw seam, and drip edge. Side-lap seam length is roughly (roof area in m²) × 5 for 0.66m-cover panels.
  8. Toggle strip-out, Building Control, skip, weekend premium and any extra labour hours.

Typical 2026 UK corrugated metal roof cost ranges

These ranges reflect 2026 nationwide pricing from the NFRC Members’ Cost Survey, Cladco trade prices, Hambleside Danelaw published rate cards, Steadmans 2026 catalogue, and Q1 2026 Checkatrade and MyBuilder quotes from Yorkshire, Lincolnshire, Norfolk, Devon and Powys.

Corrugated metal system (180 m², single-storey, moderate access)2026 installed price
0.7mm galvanised, full re-roof with strip-out + breather underlay£8,500 – £15,000
0.7mm Galvalume, full re-roof£10,000 – £20,000
Plastisol / PVDF colour-coated 0.7mm, full re-roof£14,000 – £24,000
0.8mm HPS200 heavy gauge, full re-roof£15,000 – £26,000
Polycarbonate corrugated (Suntuf / Brett Martin) — porch / lean-to 25 m²£350 – £750
Spot panel replacement (15%)£1,800 – £3,800
Re-screw existing panels (replace all Tek screws)£14 – £24 per m²
Re-flashing only (ridge + verge + valley + drip)£2,200 – £5,000
Open-purlin agricultural install (no deck, no underlay)subtract £18 – £35 per m²

Add 20 percent for two-storey, 45 percent for three-storey or higher. Add 10 to 30 percent for moderate to hard access. Add 8 to 15 percent for 0.8mm HPS200 over standard 0.7mm.

Cost drivers

Panel material and gauge. 0.7mm Galvalume is the UK volume product. Bare galvanised drops the panel cost about 13 percent. Plastisol / PVDF colour-coated adds 25 to 40 percent over bare Galvalume for the resin and bake-finish process. 0.8mm HPS200 adds 30 to 45 percent for the thicker steel.

Panel profile. 13/3 round corrugated (76mm corrugation pitch) is the residential and vernacular agricultural default. Trapezoidal box profile (32mm or 34mm deep at 200mm centres) is the modern agricultural / industrial volume product — Tata Trisomet, Joris Ide MaxiLok. Box is 5 to 10 percent more material cost.

Pitch and complexity. A 25 to 45 degree pitch is the UK norm and straightforward. Below 8 degrees needs butyl in every lap and increases cost 15 to 25 percent. Above 45 degrees, fall protection slows the crew by 20 to 35 percent. Cut-up roofs with dormers, chimneys, and roof windows add 20 to 40 percent vs a simple gable.

Strip-out scope. Existing slate or plain tile is fast strip-out — sheets lift off in minutes. Asbestos cement (the dominant 1950–80s agricultural roofing) is the expensive case — it must be removed under HSE licensed-asbestos rules at £35 to £80 per m² plus disposal at a licensed tip, on top of the new roof cost. Existing rusted metal is easy and cheap to strip.

Open-purlin vs solid deck. Open-purlin installation is the BS 5427 agricultural standard and saves £18 to £35 per m² by eliminating the deck and breather membrane. The trade-off is noise and condensation if not detailed correctly. Fully-decked is the residential standard and is required under Approved Document L for any habitable space.

Coastal corrosion. Within 5 miles of saltwater (most of Wales, the South West, and East Anglia), use Galvalume or aluminium panels with stainless Tek screws and PVDF or Plastisol topcoat — bare galvanised rusts within 8 years on the coast. Coastal premium adds 8 to 15 percent.

Wind exposure. UK coastal exposure (BS 6399-2 Zone 4 / 5) requires 0.8mm HPS200 and 150mm side-lap screw spacing in place of the standard 200mm. Add 10 to 18 percent for exposed sites in Cornwall, Pembrokeshire, the Hebrides, Caithness and Orkney.

UK code, standards, and certifications

  • BS 5427:2016 — Code of practice for the use of profiled sheet for roof and wall cladding on buildings.
  • BS 6399-2 — Loading for buildings: wind loads.
  • BS EN 14782 — Self-supporting metal sheet for roofing, external cladding and internal lining.
  • Approved Document L (2025 edition) — Conservation of fuel and power — minimum 0.18 W/m²K U-value for re-roofed dwellings.
  • Approved Document C — Site preparation and resistance to contaminants and moisture.
  • NFRC Technical Bulletin 16 — Site practice for metal profiled sheeting on pitched roofs.
  • BBA Agrément certificates — for individual panel systems (Tata Colorcoat HPS200, Cladco, Steadmans).
  • CDM Regulations 2015 — for any commercial or contracted roofing work.
  • HSE Licensed Asbestos Removal — for any pre-2000 asbestos cement strip-out.

Use an NFRC-member contractor (RoofCERT-accredited where available) for any residential corrugated project — NFRC membership includes a workmanship warranty programme (RoofPRO) and access to the manufacturer’s longer paint and substrate warranties.

Diagnostic step-by-step before quoting

  1. Walk the existing deck or purlins before strip-out — for a decked install, pop two loft hatches and inspect the rafters and any existing deck. Sagging, damp, or beetle-damaged timber means structural repair becomes part of the job. Add £15 to £45 per m² for rafter retrofit or partial re-decking.
  2. Test for asbestos before any strip-out of pre-2000 cement sheeting — get an HSE-licensed asbestos survey (£250 to £450). Asbestos cement is the dominant 1950–80s agricultural roofing and tear-off costs £35 to £80 per m² plus tip fees.
  3. Verify the existing pitch with a digital level or pitch app — pitch under 8 degrees means whole-deck bituminous membrane and changes the bid.
  4. Inspect existing purlin spacing (if open-purlin) — 600mm to 900mm on centre is the BS 5427 standard for 0.7mm sheet. If purlins are at 1.2m or wider, step up to 0.8mm HPS200 or add intermediate purlins.
  5. Sample colour at the roof — Tata Colorcoat HPS200 in heritage colours (Slate Grey, Anthracite, Olive Green, Goosewing Grey, Juniper Green) holds up better in UK sun than glossy darker colours that fade. Order chip samples and view them at the property morning and afternoon.
  6. Get three NFRC-member bids that itemize panel, eave membrane, breather underlay, ridge, verge, valley, screw kit, drip, structural work, Building Control and skip as separate line items.

Avoiding cowboy traders and overcharging

Cold-callers and door-knockers after winter storms often pitch corrugated metal at homeowners as a “lifetime” roof — it is not. Corrugated is a 30 to 40-year roof at best, and the EPDM washers under each Tek screw degrade in 12 to 20 years. Red flags include: 0.5mm sold as 0.7mm (insist on the manufacturer’s coil sticker showing the gauge and AZ150 / AZ185 Galvalume coating weight); no NFRC membership; no RoofCERT accreditation; refusal to itemize the Tek screw kit separately; no BBA Agrément certificate for the panel system; lump-sum pricing without a manufacturer’s name (Cladco, Hambleside Danelaw, Steadmans, Tata Colorcoat HPS200, Joris Ide are the legitimate UK suppliers); and any contractor who proposes to dispose of asbestos cement themselves without an HSE licence. Reputable corrugated installers in 2026 carry £2M public liability insurance, are NFRC members, and will gladly share the panel manufacturer’s published installation manual.

Sources: 2026 NFRC Members’ Cost Survey; Cladco, Hambleside Danelaw, Steadmans, Tata Colorcoat HPS200 2026 trade prices; BS 5427:2016, BS 6399-2, BS EN 14782; Approved Document L 2025 edition; NFRC Technical Bulletin 16; BBA Agrément certificate database; HSE Licensed Asbestos Removal guidance; Q1 2026 Checkatrade and MyBuilder quotes from Yorkshire, Lincolnshire, Norfolk, Devon and Powys.

Frequently asked questions

How much does a corrugated metal roof cost in 2026 in the UK?
Most UK homeowners, farmers and outbuilding owners pay £55 to £110 per m² installed for a 0.7mm Galvalume corrugated metal roof in 2026, all-in with strip-out, breather underlay, vented ridge, verge trim, valley gutter, capped Tek screws and skip disposal. A 180 m² single-storey re-roof in 0.7mm Galvalume lands around £10,000 to £20,000. Bare 0.7mm galvanised is £8,500 to £15,000. Plastisol or PVDF colour-coated 0.7mm (Tata Colorcoat, Cladco) is £14,000 to £24,000. Heavier 0.8mm HPS200 runs £15,000 to £26,000. Polycarbonate corrugated for porches and lean-tos is £350 to £750 for a 25 m² project. Source: 2026 NFRC Members' Cost Survey; Cladco, Hambleside Danelaw and Steadmans 2026 trade prices; Checkatrade and MyBuilder Q1 2026 quotes from Yorkshire, Lincolnshire, Norfolk, Devon and Powys.
What is the difference between corrugated metal and box profile sheeting?
Corrugated metal sheeting (the round-wave 3-inch / 76mm profile, often called 13/3 or Onduline-style on the agricultural side) has a 30mm to 40mm corrugation depth. Box profile sheeting has trapezoidal ribs typically 32mm or 34mm deep at 200mm centres (Tata Trisomet, Joris Ide MaxiLok). Functionally they are similar: both are exposed-fastener, screwed through the panel with EPDM-washered Tek screws. Box profile is stiffer over wider purlin spacing (up to 1.8m) and is the agricultural / industrial volume product in the UK. Round corrugated is the traditional vernacular for outbuildings, barns, sheds and lean-tos. Box is 5 to 10 percent more material cost; round corrugated is the cheaper of the two for a residential outbuilding.
How long does a corrugated metal roof last in the UK climate?
0.7mm Galvalume corrugated lasts 30 to 40 years in inland Britain, and the EPDM washers under each Tek screw should be inspected every 10 to 15 years and replaced as needed. PVDF (Kynar 500) colour-coated panels carry 30-year paint warranties from Tata Colorcoat HPS200 and Cladco. Plastisol (200 micron plasticised polymer) has a 30-year guarantee inland and 25-year coastal. Bare 0.7mm galvanised lasts 25 to 35 years inland and 12 to 18 years within 5 miles of saltwater unless overcoated. The two failure modes are EPDM washer degradation (pinhole leaks at screws) and cut-edge corrosion at sheet ends. Polycarbonate corrugated carries a 10-year UV warranty and yellows after that.
Do I need Building Control approval for a corrugated metal roof in England and Wales?
Domestic re-roofing of an existing dwelling falls under a Building Regulations Notification — replacing more than 25 percent of any roof slope triggers a thermal upgrade obligation under Approved Document L. For non-domestic outbuildings under 30 m² (sheds, summerhouses, garages detached from the main dwelling) no Building Control approval is needed. For agricultural buildings under the Town and Country Planning General Permitted Development Order 2015 (Schedule 2 Part 6) no planning permission is needed for like-for-like reroof. Conservation areas and listed buildings always need Listed Building Consent for any change of roofing material. Always check with your local authority — Building Control fees in 2026 are £180 to £420 for a single-dwelling re-roof notification.
What is the best gauge for a residential corrugated metal roof in the UK?
0.7mm is the UK residential and agricultural standard — this is the gauge stocked by Cladco, Steadmans, Hambleside Danelaw, and Tata Colorcoat. It handles foot traffic for cleaning and resists UK hail. 0.5mm is the budget gauge for sheds and low-cost agricultural — fine for unheated outbuildings but dents from ladders. 0.8mm HPS200 (Tata Colorcoat) is the heavy gauge for exposed coastal sites, hilltop locations, and any project where snow load or ladder traffic is anticipated. Step up from 0.7mm to 0.8mm for about 30 to 40 percent more material cost. The BS 5427 minimum for habitable spaces is 0.7mm.
Can I install corrugated metal directly onto purlins without a deck?
Yes — open-purlin installation is the BS 5427 standard for agricultural and outbuilding work and saves £18 to £35 per m² over a fully-decked installation. Panels are screwed directly into 50x100mm timber purlins on 600mm to 900mm centres (depending on panel gauge and snow load). A breather membrane (Tyvek, Klober) is draped across the purlins under the panels to manage condensation. For dwellings under Approved Document L, a fully-insulated rafter assembly with breather membrane under the metal and warm-roof insulation between rafters is now standard — this adds £25 to £50 per m² over a bare purlin install but is required for any habitable room beneath the roof.
What pitch can take a corrugated metal roof in the UK?
Per BS 5427:2016 and NFRC technical guidance, corrugated metal sheeting can be installed at slopes of 8 degrees (1.7/12) and steeper without modification. Below 8 degrees, the side and end laps need butyl sealant tape in every joint, and at 6 degrees and below the entire deck needs a self-adhered bituminous membrane (Cromar Vent 3 or similar) because the corrugations cannot drain sheeting water. For traditional UK pitched roofs (typically 25 to 45 degrees) no special accommodation is needed. For above 45 degrees, fall protection becomes more involved and crew speed drops 20 to 35 percent.
How noisy is a corrugated metal roof in heavy rain?
On an open-purlin installation it is loud — 55 to 70 dB inside during heavy UK rain, comparable to a traditional unlined barn. On a fully-decked installation with breather membrane and standard loft insulation (250mm Earthwool to U-value 0.16), the noise is comparable to a tile roof — 38 to 50 dB inside. Adding a multi-foil insulation (Actis, Triso-Super 10) or a sound-deadening membrane like Bauder Tec Sond drops the noise another 8 to 12 dB. For dwellings, always specify deck + breather membrane and verify the loft insulation depth before quoting. For garages, workshops and outbuildings where noise is not a concern, open-purlin is fine.

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