Roof Repair Costs in Northern Ireland

Typical Northern Ireland roof repair budgets

Three planning tiers for roof repair in Northern Ireland, with scope and a representative figure for each. Run your own numbers in the calculator for a tailored range.

Typical regional cost ranges

1. 1

   Scaffolding hire and erection

   For any work above single-storey eaves height, scaffolding is a Working at Height Regulations requirement — not optional. The line should state the duration (typically 1–4 weeks for a re-roof), erection/dismantle cost, and weekly hire rate. A roofer who proposes to work from a ladder on an accessible 2-storey roof is breaching HSE guidance and saving you nothing — they're increasing your liability if they fall on your property.

   Fair UK range: £500–£1,500 for an average 2-storey terrace or semi (front and back). Town houses and detached properties can run £1,500–£3,500.

   Ask: Is scaffolding itemised separately, who is the scaffolding firm, and how long is it allowed for?

2. 2

   Underlay / breathable membrane and battens (full strip only)

   On a full strip-and-recover, the felt or breathable membrane and timber battens beneath the tiles must be replaced — not just the visible tiles. A modern breathable membrane (e.g. Klober Permo, Cromar Vent 3) is now standard and required for new BS 5534 compliance. A quote for a 'full re-roof' that doesn't mention membrane and battens is missing the most important structural layer.

   Fair UK range: £12–£20 per m² for breathable membrane and treated battens combined, supply and fit.

   Ask: Which membrane and batten spec are you using, and is it BS 5534 compliant?

3. 3

   Tiles, slates or replacement materials with quantity

   A fair quote names the tile or slate type (concrete interlocking, plain clay, natural slate, fibre-cement), the brand if applicable (Marley, Redland, SSQ Riverstone), and the quantity in m² with a stated breakage allowance (5–10%). Salvaged or matched tiles for a partial repair should be priced separately — sourcing a discontinued match can be 2–3x the cost of new stock.

   Fair UK range: Concrete interlocking tiles £35–£60/m² supplied; natural slate £80–£140/m² supplied; clay plain tiles £60–£110/m² supplied.

   Ask: Exact tile type, brand and quantity in m² — and what's the breakage allowance you've allowed for?

4. 4

   Lead flashings and lead work to chimneys / abutments

   Where the roof meets a wall, chimney or dormer, lead flashings are the waterproof seal. New lead must be Code 4 or Code 5 to BS EN 12588, with a minimum 150mm upstand. Cement fillets in place of proper lead is a 5-year fix, not a 30-year one. Lead work needs Lead Sheet Association (LSA) trained installers — bodged lead is the #1 source of post-roofing leaks.

   Fair UK range: £60–£120 per linear metre for new Code 4/5 lead flashing fitted; chimney complete re-leading £400–£900.

   Ask: Are flashings being replaced in Code 4/5 lead to BS EN 12588, and is the installer LSA-trained?

5. 5

   Disposal, skip hire and waste transfer note

   Stripping a 100m² roof generates 6–10 tonnes of waste — mostly broken tile and old felt. The quote should cover skip hire (or grab lorry on bigger jobs), waste transfer notes (a legal requirement, your liability if not held), and any disposal of suspected asbestos cement (some 1960s–80s flat roofs and underlays). Asbestos disposal must be handled by a licensed contractor and is materially more expensive than standard waste.

   Fair UK range: £250–£600 for skip hire and disposal on a typical re-roof. Asbestos: add £400–£1,200 if present.

   Ask: Is skip hire and waste transfer included, and have you assessed for asbestos in any existing materials?

• Cash-in-hand pressure or 'special price if you decide today'

  Why it matters: This is the single biggest fraud signal in UK roofing. Reputable roofers don't doorstep, don't pressure, and don't offer cash discounts in lieu of a VAT invoice. Cash-only forfeits your consumer protection under the Consumer Rights Act 2015, voids most insurance-backed warranties, and means you have no come-back if the work fails. Trading Standards data consistently puts roofing at the top of doorstep-fraud categories.

  Ask: I'd like a written, VAT-registered quote with a 14-day cooling-off period — can you provide that?

• No scaffolding line item on a 2-storey job

  Why it matters: Scaffolding is a legal requirement for sustained work at height under the Work at Height Regulations 2005. A roofer offering to ladder-work a 2-storey roof is either uninsured (so you'd carry liability if they fall), or planning unsafe practices that lead to rushed, low-quality work. Either way, the saving is not real — you're trading £600 of scaffold for thousands of pounds of risk.

  Ask: Where is scaffolding in this quote, and which scaffold firm will you be using?

• 'Lifetime warranty' with no insurance backing

  Why it matters: A lifetime warranty from a sole trader is worth nothing the day they retire, go bust or change company name (a routine tactic). Real warranties are insurance-backed via NFRC's MasterCertificate or CompetentRoofer's IBG (Insurance-Backed Guarantee), so they pay out even if the firm vanishes. 'Lifetime' on the leaflet, no insurance certificate behind it, means a sticker not a guarantee.

  Ask: Is the warranty insurance-backed, and can I see the IBG certificate or NFRC MasterCertificate?

• No mention of breathable membrane or battens on a full strip-and-recover

  Why it matters: The membrane and battens are 70%+ of the wind-resistance and waterproofing performance of a modern roof — the tiles are the visible layer. A 'full re-roof' quote that just lists tiles is either re-using the existing 30-year-old felt (will fail in 5 years) or hiding the cost in a vague 'sundries' line. BS 5534 (2014, updated 2018) is the binding standard.

  Ask: Which BS 5534-compliant membrane and what batten size/treatment are you specifying?

• 'Roof coating' or 'tile sealant' upsell pitched as cheaper than re-roofing

  Why it matters: Roof coatings (typically acrylic or polyurethane sprays) are widely sold as a re-roofing alternative, but the NFRC, RICS and Which? have all warned against them on traditional pitched roofs. They can trap moisture in the substrate, void manufacturer tile warranties, and create cosmetic damage that the next homeowner has to strip back. If a roof genuinely needs re-roofing, a coating won't fix it; if it doesn't, you don't need it.

  Ask: Why are you proposing a coating instead of replacing the failed components, and will it void my tile manufacturer warranty?

• Vague 'making good' line with no breakdown

  Why it matters: On roofing, 'making good' usually means lead flashings, chimney pointing, gutter refit, and ventilation tile installation — items that should each be priced separately. Bundling them lets the roofer either skip them (and you find out at the first storm) or charge as 'extras' mid-job. A 50m² re-roof typically has £600–£1,500 of legitimate making-good work; if it's hidden in a single line, you can't audit it.

  Ask: Can you itemise everything in 'making good' — flashings, ventilation tiles, gutter refit, pointing — with individual prices?

• No NFRC, CompetentRoofer or RoofCERT membership and no public liability certificate offered

  Why it matters: Roofing in the UK is unregulated — anyone can call themselves a roofer. NFRC membership requires assessed competence, evidence of insurance, and a complaints process. CompetentRoofer is the government-authorised competent person scheme allowing self-certification of Building Regs compliance (mandatory on more than 50% roof renewal). Without one of these and a current £2M+ public liability certificate, you have no fallback if things go wrong.

  Ask: Are you NFRC or CompetentRoofer registered, and can I see your current public liability insurance certificate?

1. 1. Are you a member of NFRC (National Federation of Roofing Contractors) or registered with CompetentRoofer?

   Why it matters: Both schemes assess competence, require insurance and offer insurance-backed guarantees. CompetentRoofer also lets the roofer self-certify Building Regs compliance for jobs over 50% roof area — saving you a separate Building Control inspection.

2. 2. Can I see your current public liability insurance certificate, ideally £5M cover?

   Why it matters: Roofing damage to your property, neighbours, or passers-by is a real risk. £2M is industry minimum; £5M is increasingly the norm for any work involving scaffolding. The certificate must be current — ask for the date and insurer name, not just a yes/no.

3. 3. What working-at-height training do your operatives hold (IPAF, PASMA, CITB)?

   Why it matters: Working at height is the leading cause of construction fatalities in the UK. Trained operatives are insured for height work; untrained ones aren't, and your home insurance won't cover an injury claim from an untrained worker on your roof.

4. 4. Will the lead work be done by an LSA (Lead Sheet Association) trained installer, in Code 4 or 5 to BS EN 12588?

   Why it matters: Bad lead work is the #1 source of post-roofing leaks. LSA-trained installers know thermal expansion gaps, correct dressing, and proper detail at chimneys and abutments. Cement fillets and bodged lead are a 3-year fix masquerading as 30-year work.

5. 5. Can you provide 3 references from full re-roofs or similar work in the last 12 months in this region?

   Why it matters: Roofing failures often only appear 18–24 months in (a wet winter), so older references can mislead. Recent local references let you actually drive past the work, see the condition, and sometimes speak to the homeowner.

6. 6. Will you provide before-and-after photos including the membrane, battens and lead detail before tiles are replaced?

   Why it matters: Once tiles go back on, you can never see the work below. Reputable roofers proactively photograph the structural layers; reluctant ones may be planning to skip steps. This is the single best quality-assurance ask in roofing.

7. 7. What's your installation warranty, in writing, and is it insurance-backed?

   Why it matters: Industry standard is 10–25 years on workmanship, separate from the manufacturer's tile/membrane warranty. Insurance-backed means it survives the firm closing — non-insurance-backed warranties are worthless after the firm goes bust (a routine occurrence in roofing).

8. 8. How do you handle unexpected timber rot or structural issues found mid-job?

   Why it matters: On any re-roof there's a real chance of rotten rafter ends, broken battens or wet rot in roof timbers. You want a stated extra-works rate (e.g., '£X per linear metre for sister-rafter repair, agreed and photographed before any work') — not open-ended T&M.

9. 9. What's your payment schedule, and are you VAT registered?

   Why it matters: UK norm: small material deposit (10–20%), staged payments after inspection milestones for big jobs, balance on completion. Anything over 25% upfront is a structural risk. VAT registration is also essential for warranty enforcement and a sign of a real trading business.

10. 10. If I need Building Regulations sign-off (jobs over 50% roof area), will you self-certify via CompetentRoofer or do I need separate Building Control approval?

    Why it matters: Building Regs Part L applies to any work over 25% of any single roof slope (energy efficiency / insulation upgrade often required). CompetentRoofer-registered firms can self-certify, saving you £200–£400 in Building Control fees and the time delay.

Compare other regions

• Window Replacement costs in Northern Ireland
• Rendering costs in Northern Ireland
• Driveway costs in Northern Ireland
• Decking costs in Northern Ireland
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Frequently asked questions