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Hail Damage Assessment Calculator

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.

Hail Damage Assessment Calculator

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.

Estimated claim total
£3,619
Range: £3,076 – £4,342
Insurer pays after excess: £3,369
Spot repair — selective tile / slate replacement · Damage severity index: 6% · Estimated impacted area (m²): 13
Severity-tiered estimate — loss adjuster scope may vary
Roof
£2,899
Gutters
£720
Render / siding
£0
Windows
£0
Rooflights
£0
Adjuster labour
£0

What this calculator estimates

This calculator produces a UK claim-grade hail damage estimate in 2026 pounds sterling across three tiered outcomes:

  • Spot repair — selective tile or slate replacement for marginal damage on a single windward pitch.
  • Partial pitch — strip and re-cover only the pitches that took meaningful damage.
  • Full re-cover — match-and-blend is impossible (discontinued tile profile, colour, or aged slate), so the whole roof is replaced.

It separates the claim into roof, gutters and downpipes, render or cladding, windows, rooflights, adjuster supplement labour, and Building Regulations notification fees.

How to use it

  1. Enter roof area in square metres. Use the roof area calculator if unknown.
  2. Pick roof covering. Concrete tile, clay tile, slate, profiled metal, and EPDM membrane have very different damage profiles.
  3. Pick the largest hailstone observed. Marble (13 mm), £1-coin (25 mm), golf ball (44 mm), tennis ball (64 mm), and cricket ball (70+ mm) reference sizes follow Met Office hailstone classification.
  4. Set roof age class. Older clay and slate roofs are typically approved for full re-cover at marginal hail sizes because BS 5534 fitness criteria can’t be verified for pre-1990 covering.
  5. Pick how many pitches took damage. Most UK 4-pitch roofs take 60–80% of impacts on the windward face.
  6. Toggle collateral damage — gutters, render, windows, rooflights. Collateral usually corroborates the roof claim.
  7. Enter supplement adjuster hours if scope is likely to require re-inspection.

Typical 2026 UK hail claim ranges

These ranges reflect 2026 NFRC Q1 contractor rates, ABI Hail Loss Data, and quotes from major insurer preferred-network installers (Aviva, Direct Line, AXA, Saga).

Tier (220 m² concrete-tile roof, mid-life, single-storey)2026 claim total
Spot repair (1 pitch, marble-quarter hail)£950 – £2,800
Partial pitch (2 pitches, quarter-golf hail)£4,500 – £8,800
Full re-cover (3-4 pitches, golf-tennis hail)£8,800 – £14,500
Catastrophic (cricket-ball hail, multi-trade)£14,500 – £24,000+
Gutters (collateral)£480 – £900
Render / cladding (pitting)£2,000 – £3,500
Windows (typical pane)£900 – £1,400 each
Rooflights (cracked Velux)£450 – £750 each
Typical excess (2026 UK policy)£250 – £500

Add 20% for two-storey access and 45% for three-storey or higher.

Cost drivers

Hailstone size. Damage scales steeply with diameter — kinetic energy at impact scales with mass, which scales with diameter cubed. A 50 mm hailstone delivers roughly 8x the kinetic energy of a 25 mm hailstone at the same fall velocity.

Roof covering. Concrete tiles are the most claim-prone covering in the UK because of high market share and brittleness. Clay pantiles fail at lower hail sizes than slate. Profiled metal (Colorcoat HPS200 Ultra, Plastisol-coated) typically only fails functionally above 50 mm hail because the steel substrate flexes. Natural slate is the most resistant common UK covering; modern fibre-cement slates (Marley Eternit Thrutone) are less resistant than natural Welsh or Spanish slate.

Roof age and condition. BS 5534:2014+A2:2018 governs UK tile and slate fitness; pre-1990 roofs may pre-date current fixing requirements and are commonly approved for full re-cover after even marginal hail because tile-by-tile match isn’t possible.

Pitches impacted. UK 4-pitch roofs typically take heaviest damage on the windward (south-west) pitch. Partial-pitch scope is the most contested tier — insurer scope often limits to the worst pitch while homeowner advocates argue match-and-blend impossibility.

Match-and-blend / Like Kind and Quality. UK home insurance policies generally include a ‘Like Kind and Quality’ replacement clause. When the original tile profile is discontinued (common for tiles older than 15 years), full re-cover is the only viable scope — the cost differential between partial-pitch and full re-cover is the most-litigated point in UK hail claims.

Collateral damage. Bent UPVC gutters, pitted render, broken windows, cracked rooflights, and dented HVAC condensers are common. Collateral corroborates the roof claim and typically raises total settlement by 20–55%.

Excess structure. Standard 2026 UK home insurance excess is £250 to £500. Storm-prone postcodes (Highlands, west coast) may see specific storm excess of £500–£1,000.

UK codes, standards, and references

  • BS 5534:2014+A2:2018 — Code of practice for slating and tiling for pitched roofs and vertical cladding.
  • BS 8000-6:2013 — Workmanship on construction sites (roof coverings).
  • BS 6915:2008 — Design and construction of fully supported lead sheet roof and wall coverings.
  • Approved Document C — Site preparation and resistance to contaminants and moisture.
  • Met Office Daily Weather Summary — Standard hail-event evidence.
  • NFRC Technical Bulletin TB-25 — Pitched roof damage assessment.
  • NFRC Technical Bulletin TB-32 — Storm damage and re-cover decision criteria.
  • ABI Consumer Insurance Code — Industry-standard claims handling guidance.

The NFRC recommends Class 1 hail-rated tile and slate fixings in any postcode with documented hail-event return interval below 25 years. Some insurers offer premium discounts (3–8%) for documented NFRC-member installation.

Diagnostic step-by-step

  1. Photograph the hail. Date-stamped, with a coin or ruler for scale.
  2. Screenshot the Met Office Daily Weather Summary for the nearest station on the loss date.
  3. Walk the property within 7 days with date-stamped photos: roof pitches from ground level using binoculars, gutters, render, windows, rooflights, HVAC.
  4. Get a free NFRC-member roofer inspection within 14 days. They’ll document damage on a per-pitch basis with photographs.
  5. Notify the insurer within 7 days of the storm via the policy app or phone.
  6. Be present for the adjuster inspection. Have your NFRC roofer present.
  7. Get the scope and estimate in writing. Supplement if scope is short of NFRC documentation.
  8. Escalate via the FCA-aligned complaints procedure if scope is disputed; ultimately the Financial Ombudsman Service.

Avoiding scams and overcharging

Post-storm door-knocking contractors are a known UK fraud zone, especially in commuter-belt and rural postcodes. Red flags:

  • ‘Storm damage’ claims after non-storm rain events.
  • Cash-only or wire-transfer demands.
  • No NFRC membership, no proof of public liability insurance.
  • Pressure to sign before written, itemised quote.
  • Claims-management companies taking 20–35% of settlement.
  • ‘We’ll cover your excess’ offers — often insurance fraud and may invalidate the claim.

Use NFRC-member roofers with at least 5 years of in-area trading, valid public liability and employer’s liability insurance, and verifiable Checkatrade or MyBuilder reviews from local addresses.

Sources: 2026 ABI Hail Loss Data; NFRC Q1 2026 contractor rates; BS 5534:2014+A2:2018; BS 8000-6:2013; BS 6915:2008; Approved Document C; Met Office Daily Weather Summary; NFRC TB-25, TB-32; quotes from Aviva, Direct Line, AXA, and Saga preferred-network installers.

Frequently asked questions

How much does hail damage cost to repair in the UK in 2026?
A typical 2026 UK hail claim runs £950 to £18,000 depending on tier. Spot repairs on a single windward pitch after marble-to-quarter hail run £950 to £2,800. Partial-pitch replacement on a 220 m² concrete-tile roof after golf-ball hail runs £4,500 to £8,800. Full re-cover after cricket-ball-sized hail runs £8,800 to £18,000 plus collateral (gutters £600, render £2,400, broken windows £1,200 each). The excess is typically £250 to £500 on 2026 UK home insurance policies. Sources: 2026 ABI Hail Loss Data, NFRC Q1 2026 contractor rates, and quotes from Aviva, Direct Line, AXA, and Saga preferred-network installers.
What size hail damages a UK roof?
Pea-size hail rarely damages UK concrete or clay tiles. Marble-size (about 13 mm) can crack older single-lap clay tiles and degraded slates. Quarter-size (about 25 mm — £1-coin equivalent) is the threshold for functional damage to most tile profiles. Golf-ball (44 mm) causes shattering on 30–50% of concrete tiles and most clay pantiles. Tennis-ball (64 mm) virtually guarantees full re-cover. Natural slate is more resistant than concrete tile because of its grain structure. Profiled metal (Box-profile, Trapezoidal, Tile-effect) dents but rarely fails functionally.
Does UK home insurance cover hail damage?
Most UK buildings-only and combined home insurance policies cover hail as a named peril under 'storm damage', subject to the policy excess (typically £250–£500). Storm damage is defined by ABI guidance as wind exceeding 55 mph, snow that causes structural strain, rain at a 25 mm/hour intensity, or hail. The claim must demonstrate that storm conditions were present at the property location on the loss date — Met Office Daily Weather Summary or station reports are the standard evidence. Some policies exclude 'gradual deterioration' or 'wear and tear' — slate or tile already loose before the storm may be excluded. Pre-storm roof condition (covered by routine inspection records or photos) is helpful evidence.
How does a UK loss adjuster assess hail damage?
The loss adjuster will inspect the roof from a tower scaffold or hydraulic platform (for safety; UK Working at Height Regulations 2005 generally prohibits ladder-only access for inspections). They count cracked or shattered tiles, displaced ridge tiles, damaged hip and verge details, and lifted lead flashings on a per-pitch basis. The threshold for partial-pitch versus full re-cover is typically 25–40% damaged tile coverage per pitch, plus discontinued profile or colour that prevents seamless match-and-blend. NFRC technical bulletins TB-25 and TB-32 are the industry references for tile-damage assessment.
How long do I have to file a UK hail damage claim?
Most UK insurers require notification 'as soon as reasonably possible' — interpreted as within 14 to 30 days of the loss event. Formal claim filing within 6 months is the standard policy term. Late notification is the most common claim denial reason in 2026 ABI data. Photograph the hail with date-stamp, screenshot the Met Office daily weather summary for your station, and notify the insurer within 7 days for safety margin.
Should I get a roofer or loss adjuster first?
A free roofer inspection first is the recommended approach for non-trivial damage. NFRC member contractors typically inspect at no cost in exchange for the work if a claim is approved. The roofer's photographic and written documentation supports the claim filing. Insurer's loss adjuster will verify. Avoid 'no win no fee' claims-management companies that take 20–35% of settlement — they're rarely better at scope advocacy than a local NFRC-member roofer and add a substantial cost to the homeowner.
What's the difference between cosmetic and functional hail damage in UK terms?
Functional damage means the tile, slate, or metal sheet can no longer perform its weatherproofing function — cracked or shattered tile, slate with detached corner or visible mat fracture, metal panel with breached paint coating exposing substrate to corrosion. Cosmetic damage is visible (dimples, surface chipping, granule loss on bitumen) but doesn't compromise function. UK policies almost universally cover functional damage; cosmetic-only exclusions are rare. ABI guidance follows BS 5534 fitness-for-purpose criteria.
How long does a UK hail claim take to settle?
An undisputed UK hail claim with NFRC contractor documentation settles in 30 to 60 days. Disputed claims invoking the FCA-aligned complaints procedure (and ultimately the Financial Ombudsman Service) average 90 to 180 days. Catastrophic events with multiple claims in a region commonly extend to 60–120 days because adjuster capacity is regionally constrained.

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