Wales
Rear extensions in Cardiff and the Vale
Across Cardiff and the Vale we handle the whole rear extension: survey, drawings, the planning route, building control and the build. Towns we cover here include Cardiff, Barry and Penarth.
What are homes in Cardiff and the Vale like to extend?
Older terraces near the centre and post-war semis further out are typical of Cardiff and the Vale. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
Rear extension prices in Cardiff and the Vale
Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable. Per square metre including VAT, standard specification:
| Extension | Per m² |
|---|---|
| Single-storey rear extension | £1,770–£2,880 |
| Two-storey (per m² across both floors) | £1,670–£2,510 |
| Side return | £2,140–£3,530 |
| Wraparound | £2,050–£3,350 |
| Glass-led | £2,600–£4,460 |
Planning and building rules in Cardiff and the Vale
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.
Welsh building regulations apply to every rear extension. The council or a registered approver checks the work against the Welsh Approved Documents and issues a completion certificate.
In Wales, as in England, the Party Wall etc. Act 1996 requires notice to neighbours before work to a shared wall or excavation near their foundations.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings need listed building consent.
Rear extensions we build in Cardiff and the Vale
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
- Rear extensions for detached houses
- Rear extensions for bungalows
- 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
- Rear extension plans and planning applications
- Building Regulations for rear extensions
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
Towns and districts in Cardiff and the Vale
The main places we cover in Cardiff and the Vale include Cardiff, Barry and Penarth, across postcode areas CF.
| Town | Postcode districts | Nearest town we also cover |
|---|---|---|
| Cardiff | CF3, CF5, CF11 | Whitchurch (2.8 miles) |
| Barry | CF62, CF63 | Penarth (5.5 miles) |
| Penarth | CF64 | Cardiff (2.9 miles) |
| Llantwit Major | CF61 | Bridgend (7.6 miles) |
| Whitchurch | CF5, CF14, CF15 | Rhiwbina (1.2 miles) |
| Rhiwbina | CF14 | Whitchurch (1.2 miles) |
Areas near Cardiff and the Vale
FAQ
Questions people ask
How much does a rear extension cost in Cardiff and the Vale?
As a guide, £1,770–£2,880 per square metre including VAT for a standard single-storey extension at Wales rates.
Do I need planning permission in Cardiff and the Vale?
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.
Which towns in Cardiff and the Vale do you cover?
6 towns and districts, including Cardiff, Barry and Penarth.
Do you handle building control?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.