Home extensions in West Glamorgan
Looking to extend your home in West Glamorgan? Start here: extension types, guide prices for West Glamorgan, the planning rules that apply and how a project runs.
- Towns listed5
- Price regionWales (×0.93)
- Planning rulesWales
- Postcode districts12
Towns we cover in West Glamorgan
Towns we cover here include Swansea, Neath, Briton Ferry, Gorseinon.
Do extensions in West Glamorgan need planning permission?
In Wales a single-storey rear extension can usually project up to 4 m beyond the rear wall without a planning application, if it is no more than 4 m high, keeps eaves to 3 m and overall height to 4 m within 2 m of a boundary, and covers no more than half the land around the original house. Wales has no larger home extension prior approval scheme.
In a conservation area, national park, National Landscape or World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
Building regulations approval is separate from planning. Wales has its own building regulations and approved documents; the council or a registered building control approver checks the plans, inspects the work and issues a completion certificate.
What extensions cost in West Glamorgan
Use these West Glamorgan guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Single-storey rear extensions | 20 m² | £38,000 – £48,500 |
| Orangery extensions | 16 m² | £41,500 – £52,500 |
| Wraparound extensions | 25 m² | £53,000 – £67,500 |
| Conservatory replacement extensions | 14 m² | £27,500 – £36,000 |
| Kitchen extensions | 20 m² | £39,000 – £49,500 |
| Double-storey extensions | 32 m² | £53,500 – £70,000 |
| Extensions over a garage | 12 m² | £23,000 – £30,500 |
Choosing the right extension in West Glamorgan
In Wales, terraced houses with rear offshoots are common in the towns, while detached houses and bungalows dominate in rural areas.
For many houses here, pitched roof extensions, side return extensions or bungalow extensions gives the most useful space for the budget.
Every extension type in West Glamorgan
- Double-storey extensions · from £35,000
- Utility and boot room extensions · from £13,000
- Wraparound extensions · from £33,000
- Extensions over a garage · from £22,000
- Glass box extensions · from £27,500
- Timber frame extensions · from £19,500
- Building regulations for extensions · from £800
- Planning permission for extensions · from £300
- Orangery extensions · from £27,500
- Home office extensions · from £14,500
- Conservatory replacement extensions · from £18,500
- Bungalow extensions · from £24,000
- Side return extensions · from £16,500
- Extension plans and drawings · from £1,100
- Kitchen extensions · from £25,000
- Porch extensions · from £3,700
- Side extensions · from £20,000
- Annexe extensions · from £51,000
- Flat roof extensions · from £19,500
- Single-storey rear extensions · from £19,500
- Pitched roof extensions · from £20,500
- Bedroom extensions · from £24,000
Neighbouring areas
Questions about extensions in West Glamorgan
How much does an extension cost in West Glamorgan?
With our Wales factor (×0.93), a standard-spec 20 m² single-storey extension is a guide £38,000 to £48,500 including VAT. Prices for every type are linked on this page.
Do I need planning permission for an extension in West Glamorgan?
Not always. It depends on the size, position and your property's history. In Wales many single-storey rear extensions up to 4 m are permitted development.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Will my neighbours need to be told?
If you apply for planning the council notifies them, and in Wales party wall notices may be needed for work near a shared boundary.
Book a free site visit in West Glamorgan
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.