Extending your home in Cowbridge
From a small utility to a two-storey addition, we take on house extensions throughout Cowbridge, starting with a free visit and a planning check.
- Postcode districtsCF71
- Price regionWales (×0.93)
- Planning rulesWales
- Site visitFree, no obligation
Which extension suits a Cowbridge 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.
Start by comparing side return extensions, single-storey rear extensions and pitched roof extensions: between them they cover most of the layouts we see requested for houses like these.
Popular extension prices in Cowbridge
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 |
| Conservatory replacement extensions | 14 m² | £27,500 – £36,000 |
| Extensions over a garage | 12 m² | £23,000 – £30,500 |
| Single-storey rear extensions | 20 m² | £38,000 – £48,500 |
| Wraparound extensions | 25 m² | £53,000 – £67,500 |
| Side return extensions | 11 m² | £24,500 – £31,000 |
Covering Cowbridge and nearby
Postcode districts we cover around Cowbridge include CF71. We also work in nearby Barry (8 miles), Cardiff (12 miles), Penarth (12 miles). Just over the Mid Glamorgan border, Bridgend is about 6 miles away.
Planning rules in Cowbridge
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).
Every extension type in Cowbridge
- Extension plans and drawings · from £1,100
- Planning permission for extensions · from £300
- Single-storey rear extensions · from £19,500
- Conservatory replacement extensions · from £18,500
- Bedroom extensions · from £24,000
- Wraparound extensions · from £33,000
- Building regulations for extensions · from £800
- Side return extensions · from £16,500
- Orangery extensions · from £27,500
- Annexe extensions · from £51,000
- Flat roof extensions · from £19,500
- Glass box extensions · from £27,500
- Double-storey extensions · from £35,000
- Utility and boot room extensions · from £13,000
- Kitchen extensions · from £25,000
- Side extensions · from £20,000
- Bungalow extensions · from £24,000
- Extensions over a garage · from £22,000
- Pitched roof extensions · from £20,500
- Porch extensions · from £3,700
- Timber frame extensions · from £19,500
- Home office extensions · from £14,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
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 Cowbridge
How much does an extension cost in Cowbridge?
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.
Do you cover all of Cowbridge?
Yes, including the surrounding parts of South Glamorgan. Site visits are free and there is no obligation.
Do I need planning permission for an extension in Cowbridge?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Cowbridge, and the guide-price tool gives a range for your own size and finish in about a minute.
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 Cowbridge
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.