Building & Construction Specialists
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.
About this service
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.
Our Services
Pick the service that matches what you need. Each page goes deeper into materials, process, timescales and pricing across Hertfordshire and Essex.
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 optionsVelux, 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 optionsWhole-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 serviceNew 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 detailsRising 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 detailsSkim 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 optionsBlock 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 optionsCloseboard 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 optionsReactive 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 maintenanceWhy J&Co
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.
Every project is itemised and fixed before we start. No open-ended day rates, no creeping extras — variations get costed and approved in writing.
Jamie runs every job personally. You speak to the decision-maker, not a project administrator who has to check with someone else.
Workmanship cover backed by insurance — meaning the guarantee is honoured even on long-tail issues that emerge after handover.
How It Works
Free site visit. We listen to what you want, look at what's feasible, and flag any planning, structural or budget issues early.
Fully itemised written quote covering materials, labour, sub-contractors, skip hire and Building Control fees. No hidden extras.
Trades sequenced, materials ordered, programme agreed in writing. You'll know each week what's happening next.
Daily site clean-down, regular updates, snagging on the spot. Final walk-round and written guarantee on completion.
Service Area
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, Saffron Walden, Sawbridgeworth, 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
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.
