Gorseinon house extensions
Looking to extend your home in Gorseinon? Start here: extension types, guide prices for Gorseinon, the planning rules that apply and how a project runs.
- Postcode districtsSA4
- Price regionWales (×0.93)
- Planning rulesWales
- Site visitFree, no obligation
What extensions cost in Gorseinon
Prices on this page use our Wales factor of ×0.93, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £24,500 – £31,000 |
| Single-storey rear extensions | 20 m² | £38,000 – £48,500 |
| Extensions over a garage | 12 m² | £23,000 – £30,500 |
| Kitchen extensions | 20 m² | £39,000 – £49,500 |
| Wraparound extensions | 25 m² | £53,000 – £67,500 |
| Double-storey extensions | 32 m² | £53,500 – £70,000 |
| Conservatory replacement extensions | 14 m² | £27,500 – £36,000 |
Covering Gorseinon and nearby
We cover Gorseinon and the postcode districts SA4. Nearby, we also take on projects in Swansea (5 miles), Clydach (6 miles), Briton Ferry (10 miles), Neath (10 miles). Llanelli, in Dyfed, is roughly 5 miles from Gorseinon and also on our list.
Which extension suits a Gorseinon home?
Welsh housing ranges from stone terraces in the valleys to render-and-slate houses and modern estates, and the Welsh planning rules differ from England's in several places.
For many houses here, side return extensions, single-storey rear extensions or bungalow extensions gives the most useful space for the budget.
Planning and building control in Gorseinon
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 Wales a single-storey side return can fall within permitted development if it stays within the 4 m height limit and the width rules for side extensions. Conservation areas and listed buildings need consent, and the Party Wall Act applies to work on or near a shared wall.
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.
The Party Wall etc. Act 1996 applies in Wales as in England: notice must be served before work to a shared wall, building on the boundary, or excavating close to a neighbour's foundations.
Applications are decided by the local planning authority (your county or county borough council, or the national park authority).
Every extension type in Gorseinon
- Bedroom extensions · from £24,000
- Side return extensions · from £16,500
- Pitched roof extensions · from £20,500
- Kitchen extensions · from £25,000
- Building regulations for extensions · from £800
- Timber frame extensions · from £19,500
- Conservatory replacement extensions · from £18,500
- Extension plans and drawings · from £1,100
- Wraparound extensions · from £33,000
- Double-storey extensions · from £35,000
- Flat roof extensions · from £19,500
- Side extensions · from £20,000
- Bungalow extensions · from £24,000
- Utility and boot room extensions · from £13,000
- Orangery extensions · from £27,500
- Home office extensions · from £14,500
- Glass box extensions · from £27,500
- Single-storey rear extensions · from £19,500
- Annexe extensions · from £51,000
- Planning permission for extensions · from £300
- Porch extensions · from £3,700
- Extensions over a garage · from £22,000
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions about extensions in Gorseinon
How much does an extension cost in Gorseinon?
Using our Wales factor (×0.93), a standard-spec single-storey extension of 20 m² is a guide £38,000 to £48,500 including VAT, and a 32 m² two-storey extension £53,500 to £70,000. Your written price follows the survey.
How long does an extension take in Gorseinon?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
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.
Do I need planning permission for an extension in Gorseinon?
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 cover all of Gorseinon?
Yes, including the surrounding parts of West Glamorgan. Site visits are free and there is no obligation.
Book a free site visit in Gorseinon
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.