Cardiff and the Vale
Rear extensions in Barry
From the first measured visit to building control sign-off, we handle rear extensions in Barry under one contract.
Barry is in Cardiff and the Vale, with postcode districts including CF62 and CF63. The nearest places we also cover are Penarth (5.5 miles) and Cardiff (7.1 miles).
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
Rear extensions we build in Barry
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
- Rear extensions for bungalows
- Rear extension plans and planning applications
Also available across Cardiff and the Vale:
- Rear extensions for detached houses
- Flat-roof rear extensions
- Pitched and lean-to roof rear extensions
- Knocking through to a rear extension
- Roof lanterns and rooflights for rear extensions
- Permitted development rear extensions
- Building Regulations for rear extensions
Rear extension prices in Barry
Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Example | Guide inc VAT |
|---|---|
| Single-storey, 3 m × 4 m (12 m²) | £21,000–£34,500 |
| Single-storey, 4 m × 6 m (24 m²) | £42,500–£69,000 |
| Two-storey, 3 m × 5 m footprint (30 m²) | £50,000–£75,500 |
| Side return, about 14 m² | £30,000–£49,500 |
| Wraparound, about 25 m² | £51,000–£83,500 |
What are homes in Barry like to extend?
Barry has Victorian terraces near the centre and semis further out. Welsh permitted development allows up to 4 metres at the rear for many houses.
Planning rules for Barry
The Welsh Government's householder rules let many homes add a single-storey rear extension up to 4 metres deep and 4 metres high without a planning application. Deeper projects go through a householder application, because Wales has no prior approval route.
In Wales a rear extension needs Building Regulations approval through the council or a registered approver, and is built to the Welsh Approved Documents, which differ from England's in places, including energy efficiency.
Nearby towns
FAQ
Questions people ask
How much is a rear extension in Barry?
A 3 m × 4 m single-storey rear extension is about £21,000–£34,500 including VAT at our Wales guide rates; the written price follows a survey.
Do I need planning permission in Barry?
Often not for a single-storey rear extension of up to 4 metres under Welsh permitted development. Wales has no prior approval route for deeper extensions.
Is the site visit in Barry free?
Yes, with no obligation.
Do I need a party wall agreement?
In Wales, usually yes if the extension is on or near a shared boundary or close to a neighbour's foundations. We serve the notices.