Caerphilly, South Wales Valleys
Kitchen-diner rear extension in Caerphilly
An open-plan kitchen, dining and family room that opens straight onto the garden. We design, get the approvals for and build kitchen-diner rear extensions in Caerphilly and the surrounding area, with one contract from the first survey to building control sign-off.
Caerphilly and its postcode districts CF83 are part of our South Wales Valleys coverage. We usually keep the working kitchen where the old one was and put the dining table in the new space by the doors, which suits most Caerphilly homes.
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 kitchen-diner rear extension cost in Caerphilly?
A kitchen-diner rear extension in Caerphilly is priced at £1,770–£2,880 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 m deep (12 m²) | £21,000–£34,500 |
| 4 m wide × 5 m deep (20 m²) | £35,500–£57,500 |
| 4 m wide × 6 m deep (24 m²) | £42,500–£69,000 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a kitchen-diner rear extension in Caerphilly?
Here is how the rules in Wales apply to a kitchen-diner rear extension in Caerphilly.
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.
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 Caerphilly like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Caerphilly. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a kitchen-diner rear extension in Caerphilly 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Approvals
Permitted development check or householder planning application, then Building Regulations drawings to the Welsh Approved Documents and structural calculations, plus party wall notices where they apply.
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.
Kitchen-diner rear extensions near Caerphilly
Neighbouring places we cover include Rhiwbina (3.2 miles) and Whitchurch (4.3 miles).
- Kitchen-diner rear extension in Rhiwbina
- Kitchen-diner rear extension in Whitchurch
- Kitchen-diner rear extension in Risca
- Kitchen-diner rear extension in Pontypridd
- Kitchen-diner rear extension in Nelson
Other work in Caerphilly:
FAQ
Kitchen-diner rear extension questions in Caerphilly
How much does a kitchen-diner rear extension cost in Caerphilly?
As a guide, £1,770–£2,880 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £21,000–£34,500 at that rate. Your written price follows the survey.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
Should the sink face the garden?
If the plan allows, an island sink or hob facing the glass is a common choice. It needs a floor-level drain run, which is easy to lay in a new slab.
How long does a rear extension take to build in Caerphilly?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Is the site visit in Caerphilly free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do I need planning permission for a rear extension in Caerphilly?
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.