--- title: "Building & Construction in Bishop's Stortford | J&Co" description: "Building contractors in Bishop's Stortford & Herts. Extensions, loft conversions, renovations & brickwork. Owner-led, 25 yrs' experience. Free quotes." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "Service", "serviceType": "General Contractor", "name": "Building & Construction in Hertfordshire and Essex", "provider": { "@id": "https://jandco-contractorsltd.co.uk/#business" }, "areaServed": [ { "@type": "Place", "name": "Bishop's Stortford" }, { "@type": "Place", "name": "Hertfordshire" }, { "@type": "Place", "name": "Essex" } ], "hasOfferCatalog": { "@type": "OfferCatalog", "name": "Building & Construction services", "itemListElement": [ { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "Building & Extensions", "url": "https://jandco-contractorsltd.co.uk/building-extensions/" } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "Loft Conversions", "url": "https://jandco-contractorsltd.co.uk/loft-conversions/" } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "Renovations & Refurbishments", "url": "https://jandco-contractorsltd.co.uk/renovations-refurbishments/" } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "Brickwork & Masonry", "url": "https://jandco-contractorsltd.co.uk/brickwork-masonry/" } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "Damp Proofing & Waterproofing", "url": "https://jandco-contractorsltd.co.uk/damp-proofing-waterproofing/" } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "Plastering & Rendering", "url": "https://jandco-contractorsltd.co.uk/plastering-rendering/" } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "Patio & Driveway Installations", "url": "https://jandco-contractorsltd.co.uk/patio-driveway-installations/" } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "Fencing & Garden Walls", "url": "https://jandco-contractorsltd.co.uk/fencing-garden-walls/" } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "Property Maintenance", "url": "https://jandco-contractorsltd.co.uk/property-maintenance/" } } ] } }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How much does a house extension cost in Hertfordshire?", "acceptedAnswer": { "@type": "Answer", "text": "Single-storey rear extensions in our area commonly land between £40,000 and £90,000+ depending on size, glazing, kitchen relocation and groundworks. Double-storey extensions are more cost-efficient per square metre — typically starting around £75,000 and scaling with finish. Loft conversions usually fall between £45,000 and £75,000. We quote each project individually after a site visit." } }, { "@type": "Question", "name": "Do I need planning permission for an extension?", "acceptedAnswer": { "@type": "Answer", "text": "Many single-storey rear extensions fall under permitted development rights and don't need full planning permission. Double-storey, side-return and anything in a conservation area or on a listed building usually does. We'll tell you which route applies on the first visit and recommend an architect or planning consultant if needed." } }, { "@type": "Question", "name": "How long does a typical extension take to build?", "acceptedAnswer": { "@type": "Answer", "text": "A standard single-storey rear extension is usually 10–14 weeks from breaking ground to handover. Double-storey extensions run 14–20 weeks. Loft conversions typically 8–12 weeks. Whole-house refurbishments depend entirely on scope. Programme is agreed in writing before we start." } }, { "@type": "Question", "name": "Do you coordinate the architect, structural engineer and Building Control?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — we work with trusted local architects and structural engineers, or with whoever you've already appointed. Building Control inspections, structural calcs and any specialist sub-contractors (electrical, gas, glazing) are all coordinated as part of the build." } }, { "@type": "Question", "name": "Can you work on properties in conservation areas?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Bishop's Stortford, Saffron Walden and Sawbridgeworth all have significant conservation overlays. We work sympathetically with traditional materials and detailing, and we know which alterations need additional consents under Article 4 directions in this area." } }, { "@type": "Question", "name": "Do you take on smaller jobs as well as full extensions?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Brickwork repairs, garden walls, patios, plastering, damp work and small refurbishments all sit within our normal workload. There's no minimum job size — though we naturally schedule emergency and large committed projects first." } }, { "@type": "Question", "name": "Is your work guaranteed?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — every project is covered by an completion sign-off, with terms confirmed in writing. Specific manufacturer guarantees on materials (windows, roofing systems, kitchen units) run alongside and are passed to you on completion." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://jandco-contractorsltd.co.uk/" }, { "@type": "ListItem", "position": 2, "name": "Building & Construction", "item": "https://jandco-contractorsltd.co.uk/building-construction/" } ] } ] --- 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. Building & Construction Building & Construction Specialists # Building Contractors in Bishop's Stortford & Hertfordshire Single and double-storey extensions, loft conversions, full renovations, brickwork, damp proofing, plastering, driveways and ongoing property maintenance — managed under one accountable, owner-led team. [Get a Free Quote](/contact) [01279 216 215](tel:01279216215) Five-star rated Open 7 days Workmanship guarantee 25 Years' Experience Workmanship Guarantee SafeContractor Approved Gas Safe (where required) Open 7 Days Herts & Essex Coverage About this service ## What Our Building & Construction Service Covers Our building and construction service covers the structural and finishing work that turns a house into the home you actually want. Extensions and loft conversions are our largest category, but we equally take on full refurbishments, brickwork, damp remediation, plastering and external works including driveways, patios, fencing and garden walls. Most clients are residential homeowners across Hertfordshire and the Essex border who want one accountable team rather than juggling separate trades. We coordinate groundworkers, brickies, carpenters, plasterers, electricians and roofers in-house — which means tighter scheduling, fewer surprises, and one point of contact for the entire project. Landlord refurbishments and small commercial fit-outs also feature regularly. ![Two-storey rear extension with bifold doors completed by J&Co Contractors in Hertfordshire](/assets/upload-009-DFap0EVo.jpeg) Our Services ## Building & Construction Services We Offer Pick the service that matches what you need. Each page goes deeper into materials, process, timescales and pricing across Hertfordshire and Essex. ### [Building & Extensions](/building-extensions/) Single, double-storey, side, rear and wrap-around extensions managed end-to-end. Foundations through to plastered finish, including planning advice, structural calcs coordination and Building Control sign-off. We quote and run each project as a fixed-price job, not an hourly drip-feed. [Explore extension options](/building-extensions/) ### [Loft Conversions](/loft-conversions/) Velux, dormer and hip-to-gable conversions adding bedrooms, bathrooms or home offices. Ideal for growing families who don't want to lose garden space to a ground-floor extension — and one of the strongest value-adding projects you can do to a Hertfordshire property. [See loft conversion options](/loft-conversions/) ### [Renovations & Refurbishments](/renovations-refurbishments/) Whole-house refurbishments, kitchens, bathrooms, structural alterations and replacement of tired interiors. Coordinated under one project lead, with all trades sequenced properly so you're not living in chaos for longer than necessary. [View refurbishment service](/renovations-refurbishments/) ### [Brickwork & Masonry](/brickwork-masonry/) New garden walls, piers, arches, structural brickwork and matching repairs to existing walls. Clean coursing, tight joints and properly weathered finishes — the kind of brickwork that looks right in 20 years' time, not just on handover day. [See brickwork details](/brickwork-masonry/) ### [Damp Proofing & Waterproofing](/damp-proofing-waterproofing/) Rising damp diagnosis, penetrating damp remediation, basement tanking and external waterproofing. We diagnose the actual cause first — most damp problems are misdiagnosed and over-treated. Right diagnosis saves you thousands. [Get damp proofing details](/damp-proofing-waterproofing/) ### [Plastering & Rendering](/plastering-rendering/) Skim coats, float-and-set, full re-plasters, K-Rend and traditional sand-and-cement render. Smooth substrates ready for decoration, or weatherproof external finishes that won't crack within five years. [See plastering options](/plastering-rendering/) ### [Patio & Driveway Installations](/patio-driveway-installations/) Block paving, porcelain patios, resin-bound surfaces and natural stone laid on properly prepared sub-bases. The base prep is what decides whether a patio sinks in three years or stays level for thirty. [View driveway and patio options](/patio-driveway-installations/) ### [Fencing & Garden Walls](/fencing-garden-walls/) Closeboard fencing, brick and rendered garden walls, gate posts set in concrete, and railing installations. Built to last UK weather without the annual repair cycle. [See fencing & wall options](/fencing-garden-walls/) ### [Property Maintenance](/property-maintenance/) Reactive and planned maintenance for landlords, letting agents and homeowners. From a single repair through to ongoing portfolio cover — one trusted contractor, one invoice, one phone number. [Explore property maintenance](/property-maintenance/) Why J&Co ## Why Choose J&Co Contractors for Building & Construction ### One Accountable Team All trades coordinated in-house. No buck-passing, no scheduling conflicts, no waiting on a separate sub-contractor to finish before the next stage starts. ### Fixed Written Quotes Every project is itemised and fixed before we start. No open-ended day rates, no creeping extras — variations get costed and approved in writing. ### Owner-Led Site Management Jamie runs every job personally. You speak to the decision-maker, not a project administrator who has to check with someone else. ### Workmanship Guarantee Workmanship cover backed by insurance — meaning the guarantee is honoured even on long-tail issues that emerge after handover. How It Works ## Our Building & Construction Process 01 ### Initial Consultation Free site visit. We listen to what you want, look at what's feasible, and flag any planning, structural or budget issues early. 02 ### Detailed Quote Fully itemised written quote covering materials, labour, sub-contractors, skip hire and Building Control fees. No hidden extras. 03 ### Project Scheduling Trades sequenced, materials ordered, programme agreed in writing. You'll know each week what's happening next. 04 ### Build & Handover Daily site clean-down, regular updates, snagging on the spot. Final walk-round and written guarantee on completion. Service Area ## Areas We Cover for Building & Construction We deliver building and construction projects across the full Hertfordshire and Essex border. Extensions, loft conversions and refurbishments are regularly underway in [Bishop's Stortford](/areas/bishops-stortford/), [Saffron Walden](/areas/saffron-walden/), [Sawbridgeworth](/areas/sawbridgeworth/), [Welwyn Garden City](/areas/welwyn-garden-city/), Great Dunmow, Harlow, Stansted Mountfitchet, Epping, Ware, Hoddesdon, Broxbourne, Cheshunt and Stevenage. Larger projects benefit from a site visit early in your planning — even before architects' drawings are finalised — so we can flag buildability issues that affect cost. FAQs ## Building & Construction — Frequently Asked Questions ### How much does a house extension cost in Hertfordshire? ### Do I need planning permission for an extension? ### How long does a typical extension take to build? ### Do you coordinate the architect, structural engineer and Building Control? ### Can you work on properties in conservation areas? ### Do you take on smaller jobs as well as full extensions? ### Is your work guaranteed? ## Get a Free Quote on Your Building Project From a single garden wall through to a full two-storey extension, you'll get an honest site visit, a fully itemised written quote and an owner-led team that delivers what they quoted. [Request Free Quote](/contact) [01279 216 215](tel:01279216215) ![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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