Penarth, Cardiff and the Vale
Terraced house rear extension in Penarth
Rear and side return extensions for terraces, with access through the house and two neighbours. If you live in Penarth and want to know what a terraced house rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Penarth sits in Cardiff and the Vale, with postcode districts including CF64. Terraced streets make up much of the housing in parts of Cardiff and the Vale, and most rear extensions here go in without side access.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a terraced house rear extension cost in Penarth?
A terraced house rear extension in Penarth is priced at £1,910–£3,070 per square metre including VAT as a guide, before kitchen fit-out and fees. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4.5 m deep (13.5 m²) | £25,500–£41,500 |
| 3 m wide × 6 m deep (18 m²) | £34,500–£55,000 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a terraced house rear extension in Penarth?
Planning for a terraced house rear extension in Penarth follows the Welsh householder rules.
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, 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. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Penarth like to extend?
Penarth has Victorian terraces near the centre and semis further out. Welsh permitted development allows up to 4 metres at the rear for many houses.
How a terraced house rear extension in Penarth comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Paperwork handled
Planning or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Terraced house rear extensions near Penarth
Close by, we work in Cardiff, about 2.9 miles away, and Whitchurch, about 5.4 miles away.
- Terraced house rear extension in Cardiff
- Terraced house rear extension in Whitchurch
- Terraced house rear extension in Barry
- Terraced house rear extension in Rhiwbina
- Terraced house rear extension in Caerphilly
Other work in Penarth:
FAQ
Terraced house rear extension questions in Penarth
Is the site visit in Penarth free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
What postcode areas do you cover around Penarth?
Including CF64, and the surrounding Cardiff and the Vale area.
Can a terrace have a two-storey rear extension?
It is possible but harder to get through planning because of the effect on both neighbours.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
How much does a terraced house rear extension cost in Penarth?
As a guide, £1,910–£3,070 per square metre including VAT for a standard specification. For example, 3 m wide × 4.5 m deep (13.5 m²): about £25,500–£41,500 at that rate. Your written price follows the survey.
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.