All Roofing Calculators

Free roof pitch calculator for UK projects. Convert between roof angle in degrees, rise/run ratio and rafter length. Get the slope factor for accurate area takeoffs to BS 5534.

Estimate 2026 UK roof repair cost by scope, covering, age, height, access, permits and skip hire — itemised from single slate replacement through structural decking work.

Free roof tile and slate calculator for UK projects. Calculate the number of plain tiles, interlocking tiles, natural slates, ridge tiles and pallets needed in pieces per m².

Estimate UK 2026 polycarbonate conservatory, lean-to and carport roof cost (corrugated, solid, twin-wall, multi-wall 16/25 mm) by area, sheet type, tint, glazing-bar length and storey. Modelled around Marlon ST Longlife, Palram Suntuf, Brett Martin Marlon multi-wall and Corotherm products.

Free roof area calculator for UK projects. Get on-slope area in m², tile and slate quantities, and underlay rolls based on footprint and pitch in degrees. BS 5534 compliant.

Free UK roof truss calculator. Size trussed rafters, fink, attic and scissor trusses to BS 5268-3 and BS EN 14250. Member lengths, count and delivered cost in GBP.

Calculate top-up depth, roll count and material cost for loft insulation. Approved Document L Volume 1 (2021) U-value targets, mineral wool, sheep's wool, blown cellulose.

Estimate UK 2026 chimney repair cost by line item: flaunching renewal, repointing, brick replacement, above-roof rebuild, pot capping, flue liner, water-repellent seal, damper. To BS 5440 / HETAS guidance with 2026 UK trade rates.

Estimate 2026 UK EPDM rubber-membrane roof cost by line item: 1.14/1.52/2.29 mm black or white EPDM, mechanically fixed, fully bonded, ballasted or self-adhered. Real 2026 NFRC, SPRA and BBA contractor rates per BS 6229 and Approved Doc L1B.

Estimate 2026 UK guttering installation pricing per linear metre by profile, material, building height, and access. Itemised labour, materials, downpipes, leaf guards, and removal line items in pounds.

Calculate gutter fall, gradient and per-metre drop using BS EN 12056-3 minimum 1:600 or a custom 1:N gradient. Single-fall and centre-high split layouts with chalk-line drop table.

Free UK roof area calculator. Compute the actual roof surface in square metres for gable, hip, mono-pitch and L-shape roofs from footprint, pitch in degrees, and eaves overhang.

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.

Estimate UK 2026 roof inspection cost by roof size, inspection type (visual, drone, thermal, moisture, comprehensive), pitch, material, and storey — pre-purchase, post-storm, and insurance claim reports.

Estimate 2026 UK roof leak repair pricing in pounds — slipped tiles, lead flashing, valley fixes, chimney work — with itemised labour, materials, and emergency call-out fees.

Size stick-built common rafters to BS 5268-7.5 / EN 1995-1-1 with snow load, count and 2026 timber prices in pounds. CLS C16/C24 catalogue.

Size loft ventilation per BS 5250 and Approved Document C — eaves intake, ridge or gable exhaust, with vent counts in cm² free area.

Compare 2026 UK roofing costs across slate, tile, metal, asphalt and membrane on the same job. Side-by-side installed cost in £, £/m², service life and cost-per-year for British homes.

Estimate 2026 UK natural-slate roof installation cost by line item: Welsh, Spanish, Vermont, Brazilian, or synthetic slate, with strip-out, breathable underlay, copper nails, BS 5534 batten, lead or saddle ridge, code 5 lead open valley, rafter sistering, snow guards, Building Control, and skip disposal. Real 2026 NFRC and Checkatrade contractor rates.

Estimate 2026 loft-insulation cost in GBP: material, labour and total installed price for blown cellulose, glass-wool roll, mineral-wool slab and stone-wool. Approved Document L 2021 targets.

Estimate UK 2026 dormer addition cost by style (flat / shed, gable, hipped, eyebrow), size, retrofit vs new-build, property height, and access — with rooflight, plasterboard finish, planning fee, and crane line items.

Estimate 2026 UK gutter guard cost per linear metre — Hedgehog brush, foam, perforated, reverse-curve hood, or stainless micromesh. NFRC and Checkatrade rates adapted to half-round and PVC gutter profiles.

Estimate UK 2026 rooflight installation cost by size, type (fixed, centre-pivot, sun tunnel), glazing and roof covering. Includes flashing, structural alteration, plaster finish and 230V wiring.

Estimate UK 2026 solar PV roof installation cost by system size, panel type, inverter, mounting and roof covering. Includes 0% VAT note, battery storage, MCS-accredited install and DNO G98/G99 fees.

Estimate 2026 UK gutter cleaning prices in pounds sterling by linear metre, storey count, debris level, and access. Itemised call-out floor, downpipe flush, leaf-guard refit, repair, and waste-removal lines.

Estimate 2026 UK PVC single-ply membrane roof cost by line item: 1.2/1.5/1.8/2.0 mm membrane, standard PVC, KEE-modified Sarnafil, fleece-back or FiberTite PVC-CPA, with PIR insulation, gypsum overlay board, roof outlets, kitchen-extract grease stacks, strip-out, Building Control and skip removal. Real 2026 NFRC, SPRA and BBA rates.

Calculate roof snow load to BS EN 1991-1-3 UK National Annex. Returns characteristic snow load on the ground (sk), shape coefficient (μ1), exposure (Ce) and thermal (Ct) factors, and design roof snow load (s).

Estimate UK 2026 copper roof cost by area, profile (standing seam, batten roll, flat-lock, traditional sheet), copper gauge and storey. Sized to BS EN 504, BS 6915 and the Federation of Traditional Metal Roofing Contractors Guide.

Estimate UK 2026 green roof installation cost per square metre by system (extensive sedum, semi-intensive, intensive, blue-green SuDS) and structural retrofit scope. Aligns with GRO Code of Best Practice, BS 8202, BS EN 13948 and BS EN 12056-3.

Estimate 2026 UK bitumen shingle installation cost by line item: IKO Armourshield 3-tab, IKO Cambridge architectural laminate, IKO Crowne designer, or impact-rated Class 4. Strip-out, breather underlay, eaves protector, drip edge, ridge cap, starter strip, deck repair, Building Control, skip disposal. NFRC 2026 contractor rates.

Estimate UK 2026 built-up felt or mastic-asphalt cost (3-layer pour-and-roll, SBS / APP torch-on) by area, surfacing, drains and storey. Aligns with BS 8217 and NFRC TB13.

Estimate UK 2026 chimney flashing cost by stack size, material (lead Code 4/5, zinc, copper, aluminium), brickwork condition, and storey. Sized to BS 5534 and Lead Sheet Training Academy guidance.

Estimate 2026 UK clay roof tile installation cost by line item: pantile, Roman, Spanish, Mission, or flat plain tile, natural or glazed finish, machine-made or hand-made (Aldershaw, Tudor, Lambs), with strip-out, breathable membrane, BS 5534 battens, hip and ridge tiles (mortar or dry-fix), Code 4 lead valley, structural reinforcement, Building Control notification and skip disposal. 2026 NFRC and BBA-certified manufacturer rates.

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.

Estimate the full cost to replace a flat roof in the UK in 2026: EPDM rubber, GRP fibreglass, single-ply TPO/PVC, or felt — with strip-off, insulation, parapet flashings, and rainwater outlets itemised in pounds.

Calculate the right gutter size for a UK roof from area, pitch and design rainfall using BS EN 12056-3 NA hydraulic capacities. Half-round, ogee, deepflow and square profiles.

Free hip roof calculator for the UK. Compute surface area in m², common and hip rafter lengths, and ridge length for any equal-pitch four-sided hipped roof.

Estimate 2026 UK roof ice damming (snow-back) risk by climate zone, pitch, loft U-value, ventilation, eaves overhang and snow depth — with tiered remediation cost in pounds sterling to BS 5250, BS 5534, and Approved Document C.

Estimate metal roof sheet count, flashing lengths, and installed cost in GBP. Standing-seam, box-profile, corrugated, and tile-effect metal — sized to BS 5534 and Approved Document C.

Calculate metal roof cost in GBP across standing-seam, profiled steel, aluminium, zinc, and copper. Low/mid/high quote ranges with NFRC 2026 contractor data, BS 5534 compliant.

Estimate 2026 UK roof cleaning cost by area, soft wash vs jet wash, moss/lichen level, pitch and storey. NFRC-aligned guidance for tile, slate, metal.

Estimate UK 2026 flat-roof liquid coating cost by area (m²), chemistry (silicone, acrylic, polyurethane, butyl, bitumen emulsion), DFT, prep level, condition, and access — covering felt, single-ply EPDM/TPO/PVC, mod-bit, profiled metal, and concrete decks.

2026 UK roof deck (sarking) replacement cost by line item: OSB 3 or WBP plywood sarking board, strip-out, breather membrane, rafter sistering, fasteners, Building Control, and skip disposal. Real 2026 contractor rates per NFRC and BS 5534.

Free roof estimate calculator for the UK. Build a contractor-style quote with line-item costs, overheads, profit, contingency and 20% VAT — plus a good/better/best 3-tier offer and 30/40/30 stage payments.

Estimate 2026 UK roof flashing cost by component — chimney, rooflight, step, valley, eaves — and material (lead Code 4/5, aluminium, zinc, copper). Per-metre pricing + storey multiplier.

Get a 2026 UK roof replacement cost band by tile type, region, pitch, complexity and storeys — with home insurance scenario and monthly finance payment in GBP.

Estimate UK 2026 cost to strip an existing roof prior to re-roofing — by area (m²), covering (slates, tiles, sheet, felt, single-ply), overlays, batten condition, storey, access, and skip distance. Includes skip hire, batten replacement, scaffold, and underlay removal lines.

Estimate UK 2026 loft ventilation installation cost — ridge vent, eaves trays / over-fascia, gable, tile vents, mechanical PIV. Sized to BS 5250 and NHBC Chapter 7.2.

Free roofing square calculator for UK roofers. Convert m² into roofing squares (1 square = 9.29 m²), then estimate tile bundles, underlay rolls, eaves trim, and fixings to BS 5534. Waste allowance built in.

Work out the rise of a mono-pitch (lean-to) roof from span and pitch in degrees. Returns rafter length, slope factor, and surface-area multiplier to BS 5534 and Approved Document A.

Estimate UK 2026 soffit and fascia replacement cost per linear metre, material (uPVC, aluminium, painted timber, fibre-cement, composite HPL), storey, and access — full eaves replacement with bargeboards and continuous vent strip.

Estimate 2026 UK tile roof installation cost by line item: concrete, clay, Welsh or Spanish slate, or synthetic composite, with strip-out, breather membrane, batten, dry-fix ridge, code-4 or code-5 lead valley, structural reinforcement, Building Control and skip disposal. Real 2026 NFRC contractor rates.

Estimate UK 2026 zinc roof cost by area, profile (standing seam, batten roll, flat-lock, interlocking), thickness (0.7/0.8/1.0 mm), pre-weathered finish, strip-out and access. Sized to BS EN 988 and the NFRC Code of Practice for Fully Supported Metal Roofing.

Estimate 2026 UK roof underlay cost by line item: 1F bitumen sarking felt, heavy 5U bitumen, breathable membrane (Tyvek Supro, Klober Permo Air, Cromar Vent 3), or full self-adhered SBS, with eaves protector strip, drip edge, starter course, strip-out, Building Control and skip removal. Real 2026 NFRC and BS 5534 contractor rates.

Compare 2026 UK gutter prices across PVC, galvanised steel, cast aluminium, cast iron, zinc and copper on the same job. DIY material-only vs full installer cost, plus 30-year ownership cost projection per BS EN 12056-3.

Estimate UK 2026 ridge tile installation and replacement cost by linear metre, material (concrete, clay, formed metal), bedding system (mortar vs BS 8612 dry-fix) and storey. Sized to BS 5534 and CompetentRoofer scheme rates.

Estimate 2026 UK standing seam metal roof installation cost by line item: 0.7mm Galvalume steel, prepainted steel, aluminium, zinc, or copper, with strip-out, breathable underlay, vented ridge, verge trim, valley gutter, snow rail, drip edge, Building Control and skip disposal. Real 2026 NFRC contractor rates.

Estimate UK 2026 valley flashing replacement cost by length, material (Code 4/5 lead, zinc, copper, aluminium), valley type, and storey count. Sized to BS 5534 and Lead Sheet Training Academy detailing.

Estimate UK 2026 mansard roof cost by lower-face area, upper-deck area, materials, dormer count, storey and access. Aligns with BS 5534, BS 6229, NFRC Code of Practice, Listed Building & Conservation Areas Act 1990.

Estimate 2026 UK Western Red Cedar shingle and shake roof installation cost by line item: #1 Blue Label, #2 Red Label or #3 Black Label grading, hand-split or taper-sawn cut, optional Class B or Class 1 fire-retardant treatment, strip-out, breather membrane, stainless nails, Cedar Breather mat, BS 5534 batten, cedar or zinc ridge, code 4 lead valley, Building Control notification and skip disposal. Real 2026 NFRC and John Brash / Marley distributor rates.

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.

Plan a complete UK roof replacement in 2026: strip, dispose, batten, breather membrane, scaffold, and full installed cost — broken down line by line in £/m².

Estimate 2026 UK TPO single-ply membrane roof cost by line item: 1.2/1.5/2.0 mm thickness, mechanically fixed, fully adhered, induction-welded RhinoBond, or ballasted, with PIR insulation, gypsum overlay board, outlets, strip-out, Building Control and skip hire. Real 2026 NFRC and SPRA contractor rates.

Estimate 2026 UK gutter replacement pricing — strip-out of old guttering, fascia repair, new uPVC, aluminium, or cast iron systems, downpipes, drip trays. Per-metre line items.

Estimate roofing materials for a UK pitched roof in 2026: concrete or clay tiles, natural slate, battens, breather membrane, dry ridge and lead flashings — costed in GBP per m².

Estimate annual cooling-energy savings, carbon avoided and payback when upgrading from a dark roof to a high-reflectance cool roof in the UK climate. Method aligned to BRE Group, NFRC TIN 1 and Approved Document L.

Estimate 2026 UK hailstorm roof damage claim by hailstone size, tile/slate/profile, age and impacted pitches — costed to BS 5534 / Approved Document C and Q1 2026 NFRC contractor rates.

Estimate UK 2026 modified-bitumen flat roof cost (SBS torch-on, APP torch-on, SBS self-adhesive, cold-bonded) by area, layering, reinforcement, insulation, outlets, perimeter upstands and storey. Aligned with BS 8217, BS EN 13707 and NFRC Technical Bulletin 13.

Estimate UK 2026 spray polyurethane foam (sprayed PUR) roof cost by area, foam thickness, density, silicone topcoat, storey and access. Aligns with NFRC TB45 and BBA Agrément for sprayed PUR roof systems.

Size rainwater downpipes from roof area, pitch and rainfall using BS EN 12056-3 and BS 6367 methods — round and square profiles in cast iron, uPVC and aluminium.

Estimate the on-slope area of a gambrel (Dutch barn) roof in the UK. Two-pitch geometry, metric inputs, costed in GBP per m² with NFRC 2026 figures.