House extensions in Chepstow
Planning an extension in Chepstow? Compare extension types, see guide prices adjusted for Chepstow and book a free site visit.
- Postcode districtsNP16
- Price regionWales (×0.93)
- Planning rulesWales
- Site visitFree, no obligation
Planning rules in Chepstow
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).
Covering Chepstow and nearby
Our survey diary covers Chepstow, including NP16. Neighbouring towns we cover include Monmouth (11 miles), Newport, Gwent (14 miles), Cwmbran (14 miles), Pontypool (16 miles), Abergavenny (18 miles). Risca, in Mid Glamorgan, is roughly 18 miles from Chepstow and also on our list.
Which extension suits a Chepstow 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.
Depending on the plot, pitched roof extensions and bungalow extensions are often the strongest options, with side return extensions worth considering where there is room.
Guide prices for Chepstow
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 |
| Extensions over a garage | 12 m² | £23,000 – £30,500 |
| Orangery extensions | 16 m² | £41,500 – £52,500 |
| Single-storey rear extensions | 20 m² | £38,000 – £48,500 |
| Conservatory replacement extensions | 14 m² | £27,500 – £36,000 |
| Side return extensions | 11 m² | £24,500 – £31,000 |
Choose an extension type
- Glass box extensions · from £27,500
- Flat roof extensions · from £19,500
- Side extensions · from £20,000
- Kitchen extensions · from £25,000
- Extension plans and drawings · from £1,100
- Single-storey rear extensions · from £19,500
- Extensions over a garage · from £22,000
- Pitched roof extensions · from £20,500
- Double-storey extensions · from £35,000
- Building regulations for extensions · from £800
- Bungalow extensions · from £24,000
- Porch extensions · from £3,700
- Home office extensions · from £14,500
- Wraparound extensions · from £33,000
- Orangery extensions · from £27,500
- Annexe extensions · from £51,000
- Timber frame extensions · from £19,500
- Side return extensions · from £16,500
- Bedroom extensions · from £24,000
- Conservatory replacement extensions · from £18,500
- Planning permission for extensions · from £300
- Utility and boot room extensions · from £13,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Chepstow
How much does an extension cost in Chepstow?
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.
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Chepstow, and the guide-price tool gives a range for your own size and finish in about a minute.
How long does an extension take in Chepstow?
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.
Book a free site visit in Chepstow
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.