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Roof Repair Cost Calculator

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.

Roof Repair Cost Calculator

Estimate residential roof repair cost by scope, roof material, age, height and access — including permits, disposal, deck replacement and weekend premium.

Estimated repair cost
£1,421
Range: £1,137 – £1,847
Effective rate £6 per sqft
Repair labour + material
£1,276
Permit
£0
Weekend premium
£0
Disposal
£145
Decking
£0
Extended warranty
£0

What this calculator estimates

This calculator quotes the all-in price for a residential roof repair in 2026 pounds sterling, covering the full range from a single slipped slate through structural sarking and rafter work. It uses a square-foot-of-affected-area model multiplied by scope, covering type, age, height, and access factors — mirroring how an NFRC-accredited roofer builds a real quote.

The output separates these line items:

  • Repair labour + materials — square-foot cost (slates or tiles, breather membrane, battens, lead, mortar, fasteners, labour hours).
  • Building Regulations permit — flat fee when scope triggers an Approved Document inspection.
  • Weekend / rush premium — typically 35% over standard labour.
  • Disposal / skip hire — waste removal for larger jobs.
  • Decking / sarking — replacement of damaged board or OSB exposed during repair.
  • Extended workmanship warranty — optional upgrade beyond the standard 1–2 year guarantee.

A minimum service-call floor of £285 applies in most UK markets — the cost of mobilising a roofer, ladder or tower scaffold, and getting onto a residential roof.

How to use it

  1. Set the scope. Minor (single slate, lead dressing), moderate (multi-area flashing or valley), major (partial elevation with sarking exposed), or extensive (multi-elevation, structural).
  2. Pick your roof covering. Natural slate carries the highest multiplier because the work is specialist and slow.
  3. Enter the affected area. Use square feet of the section needing work.
  4. Set the roof age. Older roofs with weathered mortar, brittle slates, and corroded nails cost more.
  5. Toggle Building Regs, weekend, sarking, and warranty as needed.

Typical 2026 UK repair cost ranges

ScopeAffected areaTypical all-in cost
Minor (slipped slate, lead dressing, mortar)Under 5 m²£285 – £575
Moderate (flashing rebuild, small valley)5–25 m²£575 – £1,800
Major (partial elevation, sarking work)25–55 m²£1,800 – £4,200
Extensive (multi-elevation, structural)55+ m²£4,800 – £10,500+

Pricing assumes concrete tile or natural slate on a 2-storey home with moderate access. Welsh slate adds 55%, cedar shingle 35%, clay tile 28%, metal 20%, single-ply membrane 5%. Lead Code 4 or 5 step flashing adds £35–£65 per linear metre over zinc or aluminium.

Cost drivers

Repair scope. A minor slipped-slate repair is one roofer, a half-day, a tingle or hook and minimal disturbance. An extensive repair is a 2-person crew over 4+ days, full scaffold hire, new breather membrane to BS EN 13859-1, new battens to BS 5534 grade, fresh ridge mortar bedding, and matched slates from a specific quarry.

Roof covering. Natural Welsh slate and Buckingham slate are specialist work — few crews can match thickness, edge dressing, and weathered colour. Concrete tiles (Marley, Sandtoft, Redland) are widely available and easy to match. Clay plain tiles (Keymer, Aldershaw, Tudor) need careful sourcing for older properties. Metal standing seam needs the original installer’s profile gauge to re-form locked joints.

Roof age. A 10-year-old roof repairs cleanly. A 60-year-old slate roof breaks 2–3 adjacent slates every time the roofer steps. A 100-year-old plain tile roof with lime mortar bedding needs the bedding fully re-pointed in the area worked — adding 30% to labour. The calculator’s age multiplier reflects this.

Building height. Two-storey UK homes add 10% to labour (scaffold setup, materials staging). Three-storey or attic conversions add 25%. Anything above 4.5m to eaves usually requires a fixed tower scaffold rather than ladders — £450–£750/week hire.

Access difficulty. Narrow side passages in Victorian terraces, fenced rear gardens too narrow for a tower, mature trees blocking the eaves, listed-building scaffold restrictions — all add 20–25% to labour because materials staging and waste removal slow down.

Sarking exposure. When repair exposes felt or sarking board, expect £45–£70/m² additional for breathable membrane to BS EN 13859-1, ice-and-water shield at eaves and valleys, and BS 5534 batten replacement. If the sarking is rotten, the rafter must be inspected; replacement of a 4–5m rafter section runs £180–£320 plus access.

Repair vs re-roof

Repair when:

  • Roof is under 60% of expected service life (under 30 years for slate, 25 for tile, 15 for felt)
  • Damage is localised to one elevation, valley, or flashing detail
  • Surrounding slates or tiles are intact and well-bedded
  • No active water intrusion to the sarking or insulation
  • Mortar bedding is sound across the rest of the roof

Re-roof the elevation or full roof when:

  • Multiple leaks across the elevation or 3+ leaks anywhere
  • Roof past 75% of design life with brittle or de-laminating slates
  • Sagging deck or sarking across more than one panel area
  • Insurance is paying and the claim authorises full coverage
  • Repair cost exceeds 30% of re-roof cost

Covering-specific repair notes

Welsh slate (Penrhyn, Ffestiniog, Cwt-y-Bugail). Specialist slating only. Match by quarry, thickness, and weathered colour. Slate hooks (copper or stainless) replace original nail fixing on individual repairs. Tingles (lead clips) are an acceptable temporary fix.

Spanish slate (CUPA, Cafersa, Burón). Most common UK import. Three thickness grades (5–6 mm standard, 7–9 mm heavy). Edge-dressed matching is easier than Welsh because production is consistent.

Concrete tiles (Marley, Sandtoft, Redland). Repair tiles available from merchants. Ridge and verge mortar usually re-pointed in the area worked. Tile clips to BS 5534 required on exposed elevations.

Clay plain tiles (Keymer, Aldershaw, Tudor). Hand-made matching for listed and conservation work. Reclaimed tiles often command £1.20–£3.50 each for the right colour.

Lead and code 4/5 flashings. Soaker, step, and apron flashings re-dressed or replaced. Lead theft remains an issue in some areas — terne-coated stainless or zinc alternatives are increasingly speced.

EPDM and TPO flat roofs. Welded patch (TPO heat-welded, EPDM contact-adhesive bonded). Membrane older than 15 years often fails near the patch.

Building Regulations and codes

Most UK domestic repairs of fewer than 25% of a single elevation are exempt from Building Regulations. Triggers requiring notification:

  • More than 25% of an elevation re-covered (Approved Document L thermal upgrade triggered)
  • Decking or sarking replacement
  • Structural rafter or purlin work
  • Listed building or Conservation Area (Listed Building Consent + planning)
  • Change of covering type (Approved Document A structural check)

Reference standards: BS 5534 (slating and tiling), BS EN 13859-1 (underlay), BS 6915 (lead sheet), NFRC Technical Bulletin 33 (breather membrane), BBA Agrément certificates for specific products. Building Notice fees typically £180–£385.

Avoiding rogue traders

The UK roofing repair market has a high concentration of doorstep traders, particularly after storms. Red flags:

  • Door-knocking offering “leftover materials from a nearby job”
  • Pressure to sign before reviewing a written quote
  • Cash-only or bank transfer demand with no invoice
  • No NFRC, CompetentRoofer, or TrustMark accreditation
  • Out-of-area registration plates and no local trading address
  • “Storm chaser” with no Companies House registration

Verify the trader on Trading Standards’ approved trader list, NFRC member directory, or TrustMark register. Check Companies House for trading history of 24+ months. Ask for three local references and check Checkatrade or MyBuilder reviews.

Sources: 2026 Checkatrade pricing data; MyBuilder cost guides; NFRC Technical Bulletins 13, 33; BS 5534:2014+A2:2018; Approved Documents A, C, L (England); HMRC VAT Notice 708; BBA Agrément Roofing Index.

Frequently asked questions

How much does a roof repair cost in the UK in 2026?
Most UK homeowners pay £350 to £2,400 for a residential roof repair in 2026, with the median invoice around £820 for a moderate-scope job (multi-area flashing or valley patch) on a 2-storey concrete tile or natural slate roof under 25 years old. Minor fixes — a single slipped tile, lead flashing re-dressing, or a small ridge mortar repair — usually hit the trade minimum of £285–£475. Major repairs that expose felt and battens on a single elevation run £1,800–£4,200, and structural work with rafter or sarking replacement reaches £4,800–£10,500. Source: Checkatrade 2026 cost guide, MyBuilder data, NFRC Tech Bulletin pricing observations.
What's the difference between a roof repair and a re-roof?
A repair fixes a localised problem — failed flashing, slipped slates or tiles, a leaking valley, a small section of damaged decking — leaving the rest of the covering in place. A re-roof strips and recovers the entire roof, usually with new battens, breathable membrane, and ridge mortar bedding to BS 5534. The NFRC rule of thumb is the one-third test: if more than a third of the covering is failing, or the roof is past 75% of its design life (so 60+ years for slate, 40+ for tile, 25+ for felt), re-roofing is usually better value. Repair makes sense for newer roofs with isolated damage.
Why are older Welsh slate and Buckingham slate roofs expensive to repair?
Welsh slate and Buckingham slate roofs over 80 years old typically use original copper or stainless slate hooks (or sometimes wooden pegs in very old Victorian work). Removing a damaged slate to replace it requires cutting the existing nail or hook with a slate ripper, then fixing the new slate with a tingle or hook because the original head fixing is no longer accessible. Matched slates from the same quarry are essential — Penrhyn, Ffestiniog, and Buckingham each have a distinct shade. Reclaimed slates often command £4–£8 each for the right colour and thickness.
Do I need planning permission or Building Regulations for a roof repair?
Like-for-like repairs of fewer than 25% of any single roof elevation are exempt from Building Regulations and don't require planning permission. Replacing more than 25% of an elevation, changing the covering type (e.g. slate to tile), or altering the roof structure triggers Approved Document C and Approved Document L compliance (insulation upgrade may be required). Listed buildings and homes in Conservation Areas need Listed Building Consent or planning permission for any change to the covering material or appearance. Check with your local planning authority before starting non-trivial work.
How long does a typical UK roof repair take?
Minor repairs (single slate, lead dressing, small mortar work) are completed in a half-day visit. Moderate repairs (20–25 m² of work, valley or flashing rebuild) take a single day. Major repairs that expose sarking or battens run 2–4 days. Structural work with rafter or purlin attention is 5–8 days. The full timeline from first call — quote, scaffold hire, materials lead time, weather windows — typically spans 3–6 weeks. Welsh slate matching can add 2–3 weeks on top if the quarry has to mill specific dimensions.
Will home insurance cover a UK roof repair?
Buildings insurance covers sudden damage from named perils: storm (typically gusts over 55 mph per the ABI definition), falling trees, hail, fire, and impact. Insurers exclude wear and tear, gradual deterioration, mortar erosion, and poorly maintained flashing. Storm cover usually requires you to file within 30 days of the event and provide weather verification (Met Office data). With like-for-like cover, the insurer pays the repair invoice less your excess. Many older properties have a £250–£500 storm excess specific to roof damage. Document with dated photos before the contractor starts work.
Can I claim VAT relief on a roof repair?
Standard roof repairs are charged at the 20% standard VAT rate. Reduced 5% VAT applies to (a) repairs on a residential dwelling that has been unoccupied for over two years, (b) energy-saving improvements bundled with the repair (e.g. insulation upgrade alongside re-felting), or (c) listed building repairs in some specific circumstances. The contractor must be VAT-registered and apply the reduced rate correctly on the invoice — HMRC VAT Notice 708 sets out the qualifying conditions. Listed Places of Worship may claim VAT back via the LPW Grant Scheme for repairs.
What should a UK roof repair quote include?
A proper written quote should itemise: labour rate and hours, materials list (slate or tile type and quantity, lead grade and weight, breather membrane brand, batten grade to BS 5534), scaffolding or tower hire, skip hire or waste disposal, NFRC TrustMark membership number, workmanship warranty period, payment milestones, and start/finish dates. Look for NFRC, CompetentRoofer scheme, or TrustMark accreditation. Cash-only verbal quotes without itemisation are red flags. Insist on public liability insurance (£2m minimum) and employer's liability cover documentation.

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