Extensions in Mid Glamorgan: design, planning and build
From a small utility to a two-storey addition, we take on house extensions throughout Mid Glamorgan, starting with a free visit and a planning check.
- Towns listed12
- Price regionWales (×0.93)
- Planning rulesWales
- Postcode districts25
Towns we cover in Mid Glamorgan
Towns we cover here include Rhondda, Tonypandy, Bridgend, Merthyr Tydfil.
Do extensions in Mid 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.
Choosing the right extension in Mid Glamorgan
In Wales, terraced houses with rear offshoots are common in the towns, while detached houses and bungalows dominate in rural areas.
Depending on the plot, side return extensions and bungalow extensions are often the strongest options, with pitched roof extensions worth considering where there is room.
Guide prices for Mid Glamorgan
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) |
|---|---|---|
| Double-storey extensions | 32 m² | £53,500 – £70,000 |
| Single-storey rear extensions | 20 m² | £38,000 – £48,500 |
| Wraparound extensions | 25 m² | £53,000 – £67,500 |
| Orangery extensions | 16 m² | £41,500 – £52,500 |
| Kitchen extensions | 20 m² | £39,000 – £49,500 |
| Side return extensions | 11 m² | £24,500 – £31,000 |
| Conservatory replacement extensions | 14 m² | £27,500 – £36,000 |
All extension types we build in Mid Glamorgan
- Timber frame extensions · from £19,500
- Side return extensions · from £16,500
- Flat roof extensions · from £19,500
- Extensions over a garage · from £22,000
- Wraparound extensions · from £33,000
- Double-storey extensions · from £35,000
- Single-storey rear extensions · from £19,500
- Kitchen extensions · from £25,000
- Glass box extensions · from £27,500
- Pitched roof extensions · from £20,500
- Utility and boot room extensions · from £13,000
- Extension plans and drawings · from £1,100
- Orangery extensions · from £27,500
- Home office extensions · from £14,500
- Side extensions · from £20,000
- Planning permission for extensions · from £300
- Porch extensions · from £3,700
- Bedroom extensions · from £24,000
- Building regulations for extensions · from £800
- Annexe extensions · from £51,000
- Bungalow extensions · from £24,000
- Conservatory replacement extensions · from £18,500
Neighbouring areas
Questions about extensions in Mid Glamorgan
How much does an extension cost in Mid 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 you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do I need planning permission for an extension in Mid 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.
Who do I contract with?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Book a free site visit in Mid 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.