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 - 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. ## 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 for repair scope and our repair vs replace guide 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. 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=""> How long should a UK roof last? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> Can I just replace one face of the roof? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> How much does a full re-roof cost in Hertfordshire? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> Will I need scaffolding? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> How long does a re-roof take? ### svg]:rotate-180 text-left font-bold text-base hover:no-underline py-5" data-radix-collection-item=""> Do you give honest repair-vs-replace advice? Related Guides Roof repair vs replacement How much does a flat roof cost? Back to 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 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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