We use essential cookies to run this site, and optional cookies only with your consent. Cookie policy AcceptReject Open 7 days · Hours vary by day · 25 years' experience Office: 01279 216 215 | Mobile: 07932 442502 Services Areas About Our Work Blog Reviews Contact 01279 216 215 Free Quote - Home - Roofing - Roof Repairs - Roof Repair vs Replacement: How to Decide Guide · Roof Repairs # Roof Repair vs Replacement: How to Decide Repair if defects are isolated and the underlying system is sound. Replace if failures are spreading and the roof is past 80% of its design life. Here's the framework we actually use on quotes. Last updated: May 2026 · By Jamie Pocock Quick Answer Repair when fewer than 25% of components are failing, defects are localised, and the roof is under 80% of its design life. Replace when failures are system-wide, age is past 80% of design life, or repair quotes exceed 30% of full re-roof cost. Below those thresholds, repair is the cheaper long-run option. Above them, repair money is wasted — replacement is cheaper inside 5–7 years. ## The three-question decision framework ### Question 1 — How localised is the failure? Walk the loft and look at the roof externally. If problems are concentrated (one slope, one valley, one chimney), the rest of the roof can be left in service and the problem area repaired or partially re-roofed. If problems appear across multiple slopes, valleys and ridges, the system is reaching end-of-life as a whole. ### Question 2 — How old is the roof? Compare to design life: concrete tile 50–60 yrs, clay tile 60–80, natural slate 80–100+ (with copper/iron nails 60–70). Under 50% of design life: almost always repair. 50–80%: repair if cost-effective. Over 80%: replacement is usually the better long-run answer because new repairs will be needed every 12–24 months. ### Question 3 — What's the repair cost relative to replacement? Get a written repair quote and a written replacement quote on the same roof. If the repair is under 25% of replacement cost and buys 10+ more years, repair is the right answer. If it's over 40% of replacement cost or buys under 5 more years, you're spending money you'll spend again soon. ## What's economically sensible to repair - 1–10 slipped or cracked tiles: £150–£600 — done in half a day. - Lead flashing renewal at chimney or valley: £400–£1,200. - Single leak from one identifiable position: usually under £500. - Ridge tile re-bedding (single ridge): £600–£1,400. - UPVC roofline replacement: standalone job, £1,800–£4,500 — doesn't usually justify a re-roof on its own. - Chimney repointing or rebuild: £1,200–£4,500 — independent of the roof itself. See our roof repair service page for full repair scope. ## What's a false economy to repair - Multiple separate repairs costing more than £2,500 in 12 months - Repairs to roofs over 80% of design life with widespread underfelt failure - Roofs where the underlying battens are rotten — tiles can be re-laid but the fixings won't hold - Roofs with structural deflection (sag) — no repair fixes the cause - Mortar-bedded ridges where every ridge has perished — re-bed cost approaches partial re-roof cost ## Cost-of-ownership over 20 years StrategyYear-0 cost20-yr maintenance20-yr total Replace now (full re-roof)£8,500£500 (gutter clearance only)£9,000 Repair-as-you-go (end-of-life roof)£600£8,000+ (recurring fixes every 18 mo)£8,600+ Repair-as-you-go (mid-life roof)£600£2,500 (occasional)£3,100 The repair-as-you-go strategy is genuinely cheaper for mid-life roofs (under 80% design life) but breaks even with replacement once the roof passes end of design life. Beyond that point, you're typically also paying for internal damage caused by repeated minor leaks — not shown in the table above. ## Other variables that change the answer Planning to sell within 3 years? A failing roof typically knocks 5–15% off agreed sale prices once flagged on survey. A new roof with a transferable completion sign-off removes the issue. The replacement often pays back at sale even if economic break-even hadn't been reached on lifespan alone. Insurance position. Insurers won't pay for wear-and-tear failure of an end-of-life roof. If the roof gives up in a winter storm and the assessor judges it was already at end of life, you'll be footing the full bill anyway. Replacing pre-emptively keeps cover intact and means storm damage to the new roof is fully covered. Energy performance and grants. Full re-roofs are the only point at which insulation upgrades are economically efficient. Combined with current grant availability for low-income households, the effective cost of a new roof is sometimes 15–25% lower than headline price. Disruption tolerance. Repairs are typically 1–3 days with no scaffold (small jobs) or 1 week with scaffold (larger). Full re-roofs are 5–10 days plus 2 weeks of scaffold. If you're working from home, plan accordingly — although roofers don't typically affect indoor noise levels much. About the Author ## Jamie Pocock — Owner & Lead Contractor Jamie has 25 years' hands-on experience in roofing and building across Hertfordshire and Essex. He runs every J&Co Contractors project personally — from quote to completion — and writes these guides from real on-the-tools knowledge of what works, what doesn't, and what costs what in 2026. - 25 years' hands-on roofing and building experience - CRC Certified Roofer — self-certifies under Building Regs - SafeContractor approved - Written completion sign-off on every job FAQs ## Frequently asked questions ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> Is it ever sensible to replace just half a roof? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> How long do roof repairs last? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> Will my insurance pay for repair or replacement? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> Should I get multiple quotes? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> Can you survey for free in Bishop's Stortford and Hertfordshire? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> Will you tell me if I don't need a new roof? Related Guides 10 signs you need a new roof EPDM vs GRP flat roofs Back to Roof Repairs ## Get an honest repair-vs-replace assessment We'll survey, photograph and write up both options where they're genuinely both viable. No hard sell, no scaring you into a re-roof you don't need. See our roof repairs service 01279 216 215 Page last updated: May 2026 · J&Co Builders Ltd · 1 Ugley Hall Cottages, Bishop's Stortford CM22 6JB Owner-led roofing and building contractors covering Bishop's Stortford, Hertfordshire and Essex. 25 years of hands-on trade experience. Open seven days. 01279 216 215 (office) 07932 442502 (mobile) info@jandco-contractorsltd.co.uk 1 Ugley Hall Cottages, Bishop's Stortford CM22 6JB Open 7 days a week - Sun 07:00–17:30 - Mon 07:00–17:00 - Tue 07:30–17:00 - Wed 07:00–17:30 - Thu 07:00–17:30 - Fri 06:00–18:00 - Sat 09:00–17:00 We accept VISAAMEX PayG Pay ### Roofing - All roofing services - Flat Roofing - Roof Repairs & Maintenance - Emergency Roof Repairs - Guttering, Fascias & Soffits - Chimney Repairs & Repointing ### Building & Construction - All building services - Building & Extensions - Loft Conversions - Renovations & Refurbishments - Brickwork & Masonry - Damp Proofing & Waterproofing - Plastering & Rendering - Patio & Driveway Installations - Fencing & Garden Walls - Property Maintenance ### Areas We Cover - Bishop's Stortford - Stansted Mountfitchet - Sawbridgeworth - Great Dunmow - Harlow - Saffron Walden - Epping - Ware - Hoddesdon - Broxbourne - Cheshunt - Welwyn Garden City - Stevenage ### Company - About J&Co - Our Recent Work - Blog - Customer Reviews - Contact Us © 2026 J&Co Builders Ltd · Trading as J&Co Contractors · All rights reserved. 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