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:
- Initial design and feasibility advice, working with an architect or architectural technician where needed
- Building Warrant application and liaison with Glasgow City Council or your local authority
- 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.
The Building Warrant Process in Scotland
Almost all house extensions in Scotland need a Building Warrant before work starts, and a Completion Certificate once it’s finished. We handle this process for you — working with an architect or architectural technician to prepare drawings, submitting the application to your local council, and managing any queries that come back. We also advise early on whether your project needs planning permission in addition to a warrant, which depends on the size of the extension and your property type.
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?
Many single-storey rear extensions fall under permitted development and only need a Building Warrant, not full planning permission. This depends on the size relative to your house, boundary distances, and whether you’re in a conservation area. We check this for you at quote stage.
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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