Wales
Rear extensions in the South Wales Valleys
Rear extensions in the South Wales Valleys: we cover 27 towns including Rhondda, Tonypandy and Bridgend, with design, approvals and the build under one contract.
What are homes in the South Wales Valleys like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of the South Wales Valleys. Sloping sites are common, so floor levels and retaining walls are designed at the start.
Rear extension prices in the South Wales Valleys
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 the South Wales Valleys
Welsh permitted development allows a single-storey rear extension of up to 4 metres in depth and 4 metres in height, subject to boundary and garden-coverage limits. There is no larger-extension prior approval scheme in Wales.
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.
The Party Wall etc. Act 1996 also applies in Wales: two months' notice for work to a shared wall and one month for foundations dug close to a neighbour's building.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings need listed building consent.
Rear extensions we build in the South Wales Valleys
- 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
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
Towns and districts in the South Wales Valleys
The main places we cover in the South Wales Valleys include Rhondda, Tonypandy and Bridgend, across postcode areas CF and NP.
| Town | Postcode districts | Nearest town we also cover |
|---|---|---|
| Rhondda | CF40, CF41, CF43 | Tonypandy (2.6 miles) |
| Tonypandy | CF40 | Rhondda (2.6 miles) |
| Bridgend | CF31, CF35 | Coity (1.5 miles) |
| Cwmbran | NP44 | Pontypool (3.4 miles) |
| Merthyr Tydfil | CF47, CF48 | Aberdare (3.8 miles) |
| Coity | CF31, CF32, CF35 | Bridgend (1.5 miles) |
| Pontypool | NP4, NP44 | Cwmbran (3.4 miles) |
| Ebbw Vale | NP23 | Tredegar (1.7 miles) |
| Pontypridd | CF37 | Nelson (4.3 miles) |
| Aberdare | CF44 | Mountain Ash (3.6 miles) |
- Rhondda
- Tonypandy
- Bridgend
- Cwmbran
- Merthyr Tydfil
- Coity
- Pontypool
- Ebbw Vale
- Pontypridd
- Aberdare
- Caerphilly
- Maesteg
- Risca
- Gelligaer
- Porthcawl
- Blackwood
- Brynmawr
- Tredegar
- Llantrisant
- Pyle
- Bargoed
- Nelson
- Treharris
- Mountain Ash
- Abertillery
- Abercarn
- Aberkenfig
Areas near South Wales Valleys
FAQ
Questions people ask
How much does a rear extension cost in the South Wales Valleys?
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 the South Wales Valleys?
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 the South Wales Valleys do you cover?
27 towns and districts, including Rhondda, Tonypandy and Bridgend.
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.