Many Glasgow homeowners reach a point where their house is almost right — except for one thing. The kitchen is too small, there’s no downstairs space for the family to actually live in, or the layout just doesn’t work anymore. Moving house is expensive and disruptive. A well-built single-storey extension is often the better answer, and it’s exactly the kind of project our team specialises in.
Home Decor Zone carries out house extensions across Glasgow and the surrounding suburbs — Bearsden, Newton Mearns, Giffnock, Clarkston and beyond. One team, one fixed-price quote, from the first sketch to the final coat of paint.
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Why Extend Rather Than Move
Stamp duty, estate agent fees, the cost and stress of selling and buying in the current market — for many families in Bearsden, Newton Mearns and the Southside, a rear extension delivers the extra space they need for a fraction of the cost of moving, and lets them stay in a school catchment and street they already love.
A single-storey rear extension is the most common project we build: it typically opens the kitchen into the garden, creates a proper family living space, and adds real value to the property — often more than the build cost itself in the right area.
What Our Extension Service Includes
We manage the full project from design through to decoration, with one team and:
- On-site build planning and coordination once your design and drawings are finalised
- Construction carried out precisely to your approved architect’s drawings and Building Warrant
- Groundworks, foundations and structural steel (RSJ) installation
- Brickwork, roofing and external finishing to match your existing property
- Bi-fold or sliding doors, roof lanterns and rooflights
- First-fix electrics and plumbing, including underfloor heating where specified
- Plastering, flooring, and full internal decoration
- Optional full kitchen fit-out as part of the same project — see our kitchen renovation service
House Extension Costs in Glasgow (2026)
Honest ballpark figures for a typical single-storey rear extension:
| Scope | Typical range |
|---|---|
| Single-Storey Rear Extension (approx. 20m²), basic finish | £60,000 – £75,000 |
| Single-Storey Rear Extension (20m²) with bi-fold doors and underfloor heating | £75,000 – £96,000+ |
| Extension + full kitchen fit-out (20m²), complete project | From £105,000 |
Final price depends on size, specification, ground conditions and access. Every quote we give is written, itemised and fixed — the price we quote is the price you pay. See our full Renovation Costs Guide for more detail.
Before You Start: Permissions & Drawings
Almost all house extensions in Scotland need approved architect’s drawings, a Building Warrant, and — depending on the size and property type — planning permission, all in place before work begins. These are arranged by you directly with your architect or architectural technician ahead of the build. Once your drawings and warrant are approved, we take over and build the extension precisely to those drawings, from groundworks to the final coat of paint. If you don’t yet have a designer, we’re happy to recommend architects and architectural technicians we’ve worked with across Glasgow.
Why Glasgow Homeowners Choose Home Decor Zone
We’re a family-run, team , no middlemen. The same people who quote your project are the people who build it. We’re independently verified on MyBuilder (4.8★, 228+ reviews) and Checkatrade (9.5/10), and every extension comes with a full workmanship guarantee and public liability insurance.
Frequently Asked Questions
How long does a single-storey extension take to build?
A typical 20m² single-storey rear extension takes around 10–16 weeks from breaking ground to final decoration, depending on weather, ground conditions and specification. We give you a written programme before work starts.
Do I need planning permission for a house extension in Glasgow?
You should have any required planning permission and an approved Building Warrant in place before we start on site. This depends on the size relative to your house, boundary distances, and whether you’re in a conservation area. Your architect or architectural technician arranges the drawings and applications; we build precisely to the approved drawings.
Can you combine an extension with a new kitchen?
Yes — this is one of our most popular projects. We design the extension and kitchen together from day one, so the layout, plumbing and electrics are planned as a single project rather than two separate jobs bolted together.
Will building work disrupt my whole house?
We section off the work area and take care to minimise disruption, but a rear extension does involve a period of building work close to your home. We agree access, working hours and welfare arrangements with you before starting, and keep you updated throughout.
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