Single-storey rear extensions
Typically 3–6m deep, opening onto the garden via bi-fold or sliding aluminium doors. Most are Permitted Development under the Larger Home Extension prior approval route, removing the need for full planning permission.
House Extensions
House Extensions in BarnsleyBuilt by One Trusted Team —Designed, Managed and Finished by Us
Add the room your family actually needs without the chaos of multiple contractors. Fully project-managed extensions delivered on a fixed written price, with a clear weekly programme from groundworks to final paint.
20+ years building across Yorkshire · Fixed written quote in 48 hours
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20+Years building
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150+Extensions completed
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10 yrWorkmanship guarantee
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£2mPublic liability cover
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48 hrQuote turnaround
Overview
What a properly built extension actually gives you
A house extension is the most cost-effective way to get the layout you want without the upheaval of moving. Done correctly, it delivers more daylight, a better-flowing ground floor and a measurable uplift in your property's value — typically 10–20% in Barnsley, Sheffield and the surrounding Yorkshire market.
We handle the full build: foundations, structural steels, brick and blockwork, roof, windows and doors, first and second fix, plastering and decoration. You deal with one point of contact — the same person on day one is on site at handover.
Who it's for
Growing families, owners of pre-1990 homes with cramped kitchens, and anyone wanting an open-plan kitchen-diner, utility, downstairs WC, master suite or home office.
When you need it
When moving costs (stamp duty, fees, removals) would exceed £25–40k, or when the location is right but the layout is wrong.
Why use a professional
Extensions involve Building Regulations, Party Wall Act notices, structural calculations, drainage diversions and SAP-compliant insulation. Mistakes here are expensive to undo and uninsurable if uncertified.
Why It Matters
What goes wrong when an extension is built badly
We are regularly called in to fix work started by general handymen or one-man-bands. The pattern is depressingly consistent.
RISK 01
Foundations dug too shallow
Causes settlement cracks within 18 months. Remediation usually means underpinning at £1,200–£1,800 per linear metre.
RISK 02
Steel beams undersized or unrestrained
Ceilings sag, doors stick, plaster cracks reappear no matter how often they are filled. A structural engineer's calculation is mandatory — not optional.
RISK 03
Cold bridging at the junction
Cheap detailing where the new wall meets the old causes condensation, black mould and a permanently cold corner. Fails Building Regs Part L.
RISK 04
No Building Control sign-off
When you sell, the buyer's solicitor will ask for the completion certificate. Without it the sale stalls and indemnity insurance only papers over the crack.
RISK 05
Open programme, open wallet
Builds without a written programme drift for months. Your kitchen stays in the garage, your patience runs out, and the 'cheap' price ends up the dearest.
Our Process
A clear five-step system, from first call to final sign-off
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01
Site visit & brief
We measure up, listen to how you actually live, and walk you through realistic options against your budget.
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02
Fixed written quote
Itemised price within 48 hours. No vague allowances — every door, socket and tile is specified.
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03
Drawings & approvals
We coordinate the architect, structural engineer and Building Control submissions on your behalf.
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04
Programmed build
Foundations, structure, watertight shell, first fix, plaster, second fix and decoration — to a weekly schedule you can see.
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05
Sign-off & guarantee
Building Control completion certificate handed over with a 10-year written workmanship guarantee.
Benefits
What you actually get when we run the job
Fixed price, not 'from'
You sign off the cost before we lift a shovel. Variations are quoted in writing and approved before any work happens.
One trusted crew
Our own bricklayers, joiners and plasterers — no rotating subcontractors who've never met you.
Programmed weekly
You always know what is happening this week and next. Your home is not a mystery.
Building Regs sign-off
Full certification handed over on completion — protecting your resale value forever.
Tidy site every Friday
Skips emptied, materials covered, your driveway swept. We work in your home, not on a building site.
10-year guarantee
Written workmanship cover plus manufacturer warranties on windows, roofing and boilers.
In Detail
Extension types and detailing we deliver across Yorkshire
Every street in Barnsley, Sheffield, Wakefield and Leeds has its own stock — from interwar semis with rear returns to 1970s detached houses with attached garages. The right extension type depends on the property, the plot and the planning context.
Side-return infills
Common on Victorian and Edwardian terraces in Sheffield and Leeds. Fills the awkward narrow strip beside the kitchen, instantly turning a galley layout into a wide kitchen-diner with rooflights.
Wrap-around (L-shaped) extensions
Combines a rear and side return. The largest single uplift in usable space — perfect for an open-plan kitchen, dining and snug zone.
Double-storey extensions
Add an extra bedroom and en-suite above a kitchen-diner. Cost per square metre is lower than single-storey because the foundations and roof serve two floors.
Over-structure extensions
Building above an existing single-storey kitchen or garage. Requires a full structural survey to confirm foundations and walls can carry the new load.
Materials we work with
Reclaimed and new brick to match Yorkshire stock, natural stone where conservation requires, render systems (silicone and mineral), zinc and standing-seam roofs, oak frames, and aluminium glazing from Origin, Smart Systems and Schüco.
Glazing strategy
Bi-folds for full opening, sliders for cleaner sightlines, fixed picture windows for view-framing, and rooflights (Velux or flat-glass) to bring daylight deep into the plan.
Heating and insulation
Underfloor heating on a 75mm screed over 100mm PIR is now standard for new extensions. Wall U-values built to 0.18 W/m²K, roof to 0.13 — well inside current Building Regs Part L.
FAQ
Straight answers to the questions we hear most
Ready to get a fixed written quote for your house extensions?
Tell us about your project. We'll arrange a free site visit and send your itemised written quote within 48 hours — no obligation.
Family-run · 20+ years building across Yorkshire · Fully insured · 10-year workmanship guarantee