--- title: "Roofing & Building Blog | J&Co Contractors Hertfordshire" description: "Practical roofing, flat roof, extension and loft advice from a Hertfordshire contractor with 25 years on the tools. 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[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. Blog The J&Co Blog # Practical roofing & building advice from a Hertfordshire contractor. Real numbers, real timelines, real on-the-tools knowledge. Written by Jamie Pocock — owner of J&Co Contractors — for homeowners across Bishop's Stortford, Hertfordshire and Essex. [ ![Pitched tile roof inspection on a Hertfordshire home before winter](/assets/wa-435-169-BMBPQKLs.jpeg) Featured · Roofing ## Winter Roof Checklist: 12 Things Every Hertfordshire Homeowner Should Check Before December The 12 things that cause 90% of winter roof leaks in Hertfordshire — and how to spot them in 20 minutes from the ground. May 2026 7 min read Read the article ](/blog/winter-roof-checklist-hertfordshire/) Latest articles ## All posts [ ![EPDM flat roof replacement on a domestic extension in Bishop's Stortford](/assets/wa-435-47-C__F_29U.jpeg) Roofing ### 5 Signs Your Flat Roof Needs Replacing — Not Just Patching When patch repairs stop being economic. Five visible signs that a full flat roof replacement is the right call. 6 min Read ](/blog/how-to-tell-if-your-flat-roof-needs-replacing/)[ ![Gutter cleaning on a Hertfordshire semi-detached home](/assets/upload-009-DFap0EVo.jpeg) Maintenance ### What Blocked Gutters Actually Cost You — and Why a £120 Clean Saves £6,000 Later The maths on what blocked gutters cause downstream — and the simple annual habit that prevents all of it. 5 min Read ](/blog/blocked-gutters-real-cost/)[ ![Repointed chimney stack with new lead flashing on a Hertfordshire property](/assets/upload-019-BqExN-Zc.jpeg) Roofing ### Chimney Leak After a Storm — What to Check Before You Call Storm-driven chimney leaks have four common causes. Here's how to identify which one you're looking at. 5 min Read ](/blog/chimney-leak-after-storm-what-to-do/)[ ![Single-storey rear extension built under permitted development in Hertfordshire](/assets/upload-009-DFap0EVo.jpeg) Building ### Extensions: When You Need Planning Permission and When You Don't Permitted development covers more than most homeowners realise — but the limits matter. Here's the 2026 breakdown. 8 min Read ](/blog/permitted-development-vs-planning-extensions/)[ ![Completed dormer loft conversion bedroom in Bishop's Stortford](/assets/wa-435-79-Cfvt7K6N.jpeg) Building ### Is a Loft Conversion Still Worth It in 2026? Costs are up, but so is the value added. Here's the honest 2026 answer for Hertfordshire and Essex homeowners. 7 min Read ](/blog/loft-conversion-worth-it-2026/) Guides ## Cost & advice guides In-depth guides on roofing and building costs, materials and warning signs. - [ Flat Roofing EPDM vs GRP Flat Roofs: Which Is Better? ](/guides/epdm-vs-grp-flat-roofs/) - [ Flat Roofing How Much Does a Flat Roof Cost in 2026? ](/guides/how-much-does-a-flat-roof-cost/) - [ Roof Repairs 10 Signs You Need a New Roof (Not Just a Repair) ](/guides/signs-you-need-a-new-roof/) - [ Roof Repairs Roof Repair vs Replacement: How to Decide ](/guides/roof-repair-vs-replacement/) - [ Loft Conversions Loft Conversion Cost UK 2026: Full Price Guide ](/guides/loft-conversion-cost-uk/) - [ Loft Conversions Dormer vs Velux Loft Conversion: Which Is Right for You? ](/guides/dormer-vs-velux-loft-conversions/) - [ Extensions How Much Does a House Extension Cost in 2026? ](/guides/how-much-does-a-house-extension-cost/) - [ Extensions Single vs Double-Storey Extensions: How to Choose ](/guides/single-vs-double-storey-extensions/) ![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. 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