--- title: "10 Signs You Need a New Roof (Not Just a Repair) | J&Co" description: "How to tell if your roof needs replacing rather than repairing — sagging, widespread slipped tiles, daylight in the loft and 7 more signs. Hertfordshire roofer." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "Article", "headline": "10 Signs You Need a New Roof (Not Just a Repair)", "description": "How to tell if your roof needs replacing rather than repairing — sagging, widespread slipped tiles, daylight in the loft and 7 more signs. Hertfordshire roofer.", "mainEntityOfPage": "https://jandco-contractorsltd.co.uk/guides/signs-you-need-a-new-roof/", "datePublished": "2026-05-07", "dateModified": "2026-05-07", "author": { "@type": "Person", "name": "Jamie Pocock", "jobTitle": "Owner & Lead Contractor", "worksFor": { "@id": "https://jandco-contractorsltd.co.uk/#business" } }, "publisher": { "@type": "Organization", "name": "J&Co Contractors", "url": "https://jandco-contractorsltd.co.uk" }, "image": [ "https://jandco-contractorsltd.co.uk/assets/wa-435-169-BMBPQKLs.jpeg" ] }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How long should a UK roof last?", "acceptedAnswer": { "@type": "Answer", "text": "Concrete tile: 50–60 years. Clay tile: 60–80 years. Natural slate: 80–100+ years (though copper or iron nails typically fail at 60–70). Bitumen felt flat roof: 10–15 years. EPDM: 40–50. GRP: 25–35." } }, { "@type": "Question", "name": "Can I just replace one face of the roof?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — a partial re-roof is often the right answer when one slope has failed and another is sound. Done properly with full strip back to rafters, new underfelt, battens and tiles, the new section will outlast the old by decades." } }, { "@type": "Question", "name": "How much does a full re-roof cost in Hertfordshire?", "acceptedAnswer": { "@type": "Answer", "text": "Typical 3-bed semi: £6,500–£11,000 strip-and-re-roof. Larger detached or complex roofs: £10,000–£16,000+. Add £1,500–£3,500 for new dry-fix ridge, lead flashings and gutter renewal where appropriate." } }, { "@type": "Question", "name": "Will I need scaffolding?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — full re-roofs and most partial re-roofs require edge-protection scaffold (CDM regulations). Typical scaffold hire £1,200–£3,500 depending on roof size and access, included in the quote." } }, { "@type": "Question", "name": "How long does a re-roof take?", "acceptedAnswer": { "@type": "Answer", "text": "Typical 3-bed semi: 5–8 working days strip and re-lay, plus 1 week of scaffold either side. Larger or more complex roofs 2–3 weeks total." } }, { "@type": "Question", "name": "Do you give honest repair-vs-replace advice?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We quote whichever option genuinely makes economic sense for your roof — not whichever is bigger. If a £400 repair will buy you 10 more years, that's the quote you'll get." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://jandco-contractorsltd.co.uk/" }, { "@type": "ListItem", "position": 2, "name": "Roofing", "item": "https://jandco-contractorsltd.co.uk/roofing/" }, { "@type": "ListItem", "position": 3, "name": "Roof Repairs", "item": "https://jandco-contractorsltd.co.uk/roof-repairs/" }, { "@type": "ListItem", "position": 4, "name": "10 Signs You Need a New Roof (Not Just a Repair)", "item": "https://jandco-contractorsltd.co.uk/guides/signs-you-need-a-new-roof/" } ] } ] --- We use essential cookies to run this site, and optional cookies only with your consent. [Cookie policy](/cookie-policy/) AcceptReject Open 7 days · Hours vary by day · 25 years' experience [Office: 01279 216 215](tel:01279216215) | [Mobile: 07379 964569](tel:07379964569) [![J&Co Contractors logo](/assets/jandco-logo-DkXiFtbE.png)](/) Services Areas [About](/about/) [Our Work](/our-work/) [Blog](/blog/) [Reviews](/reviews/) [Contact](/contact/) [01279 216 215](tel:01279216215) [Free Quote](/contact/) 1. [Home](/) 2. [Roofing](/roofing/) 3. [Roof Repairs](/roof-repairs/) 4. 10 Signs You Need a New Roof (Not Just a Repair) Guide · Roof Repairs # 10 Signs You Need a New Roof (Not Just a Repair) Most roofs we attend can be repaired. But there's a tipping point where patching is throwing money at a roof that needs replacing. Here are the 10 signs we use to call it. Last updated: May 2026 · By Jamie Pocock Quick Answer **You almost certainly need a new roof if you can see daylight from inside the loft, the roof line is visibly sagging, or more than 25% of tiles are slipped, cracked or missing.** Less obviously: widespread underfelt failure, perished mortar across all bedding, repeated leaks in different positions, and concrete tile roofs over 50 years old are also strong indicators. Single isolated issues are repairs — system-wide failures are replacements. ![Aged pitched roof showing widespread slipped tiles and end-of-life signs in Hertfordshire](/assets/wa-435-169-BMBPQKLs.jpeg) ## The 10 signs in order of severity ### 1\. Daylight visible through the roof from inside the loft Stand in the loft on a sunny day with the loft light off. If you can see pinpricks of daylight, water can get in. Isolated holes can be patched; widespread daylight means the underfelt has failed and the roof needs stripping. ### 2\. Visible sag in the roof line Look at the ridge line from the street. A perfectly straight ridge is normal; a dip or wave means structural deflection — usually rotted rafters, undersized timbers or failed purlins. Structural sag is a replacement, not a repair. ### 3\. More than 25% of tiles slipped, cracked or missing 1–5 slipped tiles? Repair. A whole face of the roof showing slippage means nail fatigue is widespread (typical on roofs 60+ years old) and individual fixes will keep coming back as new tiles slip month after month. ### 4\. Multiple leak positions in different rooms One leak in one position usually traces to one defect. Three leaks in three rooms means the roof system is failing as a whole — patching each location costs more than a strip-and-relay over 12–24 months. ### 5\. Concrete tile roof over 50 years old Marley and Redland concrete interlocking tiles laid 1955–1975 — most post-war UK housing — have a 50–60 year service life. Most are now in or past that window. Symptoms: spalling tile faces, sagging ridges, soft underfelt below. ### 6\. Underfelt visible and degraded Look up at the felt from inside the loft. Original 1960s/70s bitumen felt that's brittle, crumbling or has visible holes is past end-of-life. Underfelt is the secondary water barrier — when it fails, every minor tile slip becomes a leak. ### 7\. Heavy moss with lifted tiles Moss itself is treatable. Moss thick enough to physically lift tiles off the battens is a sign that the bedding mortar has failed and tiles are no longer mechanically secured. Re-bedding all tiles often costs as much as a partial re-roof. ### 8\. Perished mortar on every ridge and verge Isolated ridge mortar failure is a repair. Mortar perished across every ridge tile, verge and hip is a sign the whole bedding system has reached end of life — usually paired with tile slippage on the same roof. ### 9\. Insulation in the loft permanently damp Damp insulation means water has been getting in repeatedly, not in single events. Wet insulation also loses 70%+ of its thermal performance — your heating bill is already paying for the failed roof. ### 10\. Multiple repair quotes in 2 years If you've had three or more genuine repair call-outs in 24 months for different defects, the roof is telling you it's done. Money spent chasing repairs would have paid down a strip-and-re-roof inside 5 years. ## Repair, partial re-roof or full strip-and-re-roof? ### Repair (£150–£1,500) 1–5 slipped tiles, single leak in single position, isolated ridge or flashing failure. Typical lifespan extension: 5–15 years. ### Partial re-roof (£1,500–£4,500) One face of the roof failing, one valley collapsing, one chimney stripping back. Replace the affected section properly while leaving sound areas. Typical lifespan extension: 15–25 years. ### Full strip-and-re-roof (£6,500–£14,000) Full strip of tiles and felt, replacement underfelt and battens, dry-fix ridge system, re-lay or replace tiles, full new lead flashings. Typical service life: 50+ years. Honest contractors will quote both repair and replace where genuinely viable, with realistic timeframes for each. We do — see our [roof repair service](/roof-repairs/) for repair scope and our [repair vs replace guide](/guides/roof-repair-vs-replacement/) for the deeper decision framework. ## Things to factor in before deciding **Insurance vs replacement.** Insurance covers sudden damage (storms, fallen trees), not gradual wear. A 70-year-old end-of-life roof failing in winter is wear, not damage — your insurer will decline. Replace before you need a claim, not after. **Energy performance.** Full re-roofs are the natural moment to upgrade insulation and add breathable underfelt. The combined effect typically cuts winter heat loss by 25–35% on uninsulated post-war stock. **Building Regulations.** Stripping more than 25% of the roof area triggers Approved Document L (insulation) and B (fire spread) compliance. Reputable contractors include the BR notification and sign-off in the quote — uninsured DIY work invalidates buildings cover and complicates future sale. **Selling soon?** A failing roof shows up on every survey and either kills the sale or knocks 5–15% off the agreed price. A new roof with a transferable completion sign-off removes the issue entirely and pays back at sale. ![Recently completed roofing project by J&Co Contractors in Hertfordshire](/assets/wa-435-169-BMBPQKLs.jpeg) 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 ### How long should a UK roof last? ### Can I just replace one face of the roof? ### How much does a full re-roof cost in Hertfordshire? ### Will I need scaffolding? ### How long does a re-roof take? ### Do you give honest repair-vs-replace advice? Related Guides [Roof repair vs replacement](/guides/roof-repair-vs-replacement/) [How much does a flat roof cost?](/guides/how-much-does-a-flat-roof-cost/) [Back to Roof Repairs](/roof-repairs/) ## Not sure if your roof needs repair or replacement? We'll survey honestly and quote whichever option genuinely suits your roof. No hard sell, no scaring you into a re-roof you don't need. [See our roof repairs service](/roof-repairs/) [01279 216 215](tel:01279216215) Page last updated: May 2026 · J&Co Builders Ltd · 1 Ugley Hall Cottages, Bishop's Stortford CM22 6JB ![J&Co Contractors](/assets/jandco-logo-DkXiFtbE.png) 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)](tel:01279216215) [07379 964569 (mobile)](tel:07379964569) [info@jandco-contractorsltd.co.uk](mailto: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 [](https://www.facebook.com/share/18mTGdCPdF/?mibextid=wwXIfr) ### Roofing - [All roofing services](/roofing/) - [Flat Roofing](/flat-roofing/) - [Roof Repairs & Maintenance](/roof-repairs/) - [Emergency Roof Repairs](/emergency-roof-repairs/) - [Guttering, Fascias & Soffits](/guttering-fascias-soffits/) - [Chimney Repairs & Repointing](/chimney-repairs-repointing/) ### Building & Construction - [All building services](/building-construction/) - [Building & Extensions](/building-extensions/) - [Loft Conversions](/loft-conversions/) - [Renovations & Refurbishments](/renovations-refurbishments/) - [Brickwork & Masonry](/brickwork-masonry/) - [Damp Proofing & Waterproofing](/damp-proofing-waterproofing/) - [Plastering & Rendering](/plastering-rendering/) - [Patio & Driveway Installations](/patio-driveway-installations/) - [Fencing & Garden Walls](/fencing-garden-walls/) - [Property Maintenance](/property-maintenance/) ### Areas We Cover - [Bishop's Stortford](/areas/bishops-stortford/) - [Stansted Mountfitchet](/areas/stansted-mountfitchet/) - [Sawbridgeworth](/areas/sawbridgeworth/) - [Great Dunmow](/areas/great-dunmow/) - [Harlow](/areas/harlow/) - [Saffron Walden](/areas/saffron-walden/) - [Epping](/areas/epping/) - [Ware](/areas/ware/) - [Hoddesdon](/areas/hoddesdon/) - [Broxbourne](/areas/broxbourne/) - [Cheshunt](/areas/cheshunt/) - [Welwyn Garden City](/areas/welwyn-garden-city/) - [Stevenage](/areas/stevenage/) ### Company - [About J&Co](/about/) - [Our Recent Work](/our-work/) - [Blog](/blog/) - [Customer Reviews](/reviews/) - [Contact Us](/contact/) © 2026 J&Co Builders Ltd · Trading as J&Co Contractors · All rights reserved. [Privacy Policy](/privacy-policy/) [Terms & Conditions](/terms-conditions/) [Cookie Policy](/cookie-policy/) [Call Now](tel:01279216215) [Free Quote](/contact)