House extensions in Cwmbran
More space without moving: we plan and build extensions across Cwmbran, with one team for the drawings, the council and the build.
- Postcode districtsNP44
- Price regionWales (×0.93)
- Planning rulesWales
- Site visitFree, no obligation
Where we work near Cwmbran
Postcode districts we cover around Cwmbran include NP44. Neighbouring towns we cover include Pontypool (3 miles), Newport, Gwent (5 miles), Ebbw Vale (12 miles), Abergavenny (12 miles), Chepstow (14 miles). Risca, in Mid Glamorgan, is roughly 5 miles from Cwmbran and also on our list.
What extensions cost in Cwmbran
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 |
| 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 |
| Extensions over a garage | 12 m² | £23,000 – £30,500 |
Choosing the right extension in Cwmbran
In Wales, terraced houses with rear offshoots are common in the towns, while detached houses and bungalows dominate in rural areas.
The types we would usually look at first for a home in Cwmbran are pitched roof extensions, side return extensions and single-storey rear extensions, depending on the garden and how the house is laid out.
Approvals for an extension in Cwmbran
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 extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house, and it must not come closer to a highway than the existing side wall. Larger side extensions need planning permission.
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.
Applications are decided by the local planning authority (your county or county borough council, or the national park authority).
Extension types and starting prices
- Bedroom extensions · from £24,000
- Annexe extensions · from £51,000
- Wraparound extensions · from £33,000
- Side extensions · from £20,000
- Timber frame extensions · from £19,500
- Orangery extensions · from £27,500
- Home office extensions · from £14,500
- Glass box extensions · from £27,500
- Building regulations for extensions · from £800
- Conservatory replacement extensions · from £18,500
- Utility and boot room extensions · from £13,000
- Kitchen extensions · from £25,000
- Porch extensions · from £3,700
- Side return extensions · from £16,500
- Pitched roof extensions · from £20,500
- Bungalow extensions · from £24,000
- Single-storey rear extensions · from £19,500
- Flat roof extensions · from £19,500
- Double-storey extensions · from £35,000
- Extensions over a garage · from £22,000
- Extension plans and drawings · from £1,100
- Planning permission for extensions · from £300
Free site visit
We visit your Cwmbran home, measure up, talk through what you want and check the planning position.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Cwmbran
How much does an extension cost in Cwmbran?
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.
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.
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.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Book a free site visit in Cwmbran
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.