Rhiwbina, Cardiff and the Vale
Kitchen-diner rear extension in Rhiwbina
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 Rhiwbina and the surrounding area, with one contract from the first survey to building control sign-off.
Rhiwbina sits in Cardiff and the Vale, with postcode districts including CF14. 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 Rhiwbina 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 Rhiwbina?
Guide prices for a kitchen-diner rear extension in Rhiwbina start from our Wales rate of £1,770–£2,880 per square metre, including VAT. 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a kitchen-diner rear extension in Rhiwbina?
Whether your kitchen-diner rear extension in Rhiwbina needs a planning application depends on its size, your house and any local restrictions.
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. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Rhiwbina like to extend?
Older terraces near the centre and post-war semis further out are typical of Rhiwbina. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
How a kitchen-diner rear extension in Rhiwbina comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
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.
Kitchen-diner rear extensions near Rhiwbina
Neighbouring places we cover include Whitchurch (1.2 miles) and Caerphilly (3.2 miles).
- Kitchen-diner rear extension in Whitchurch
- Kitchen-diner rear extension in Caerphilly
- Kitchen-diner rear extension in Cardiff
- Kitchen-diner rear extension in Penarth
- Kitchen-diner rear extension in Llantrisant
Other work in Rhiwbina:
FAQ
Kitchen-diner rear extension questions in Rhiwbina
Do I need planning permission for a rear extension in Rhiwbina?
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.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Do you fit the kitchen?
Yes, whether you buy it yourself or we supply it. We take the measurements from the built shell, not the drawings.
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.
How much does a kitchen-diner rear extension cost in Rhiwbina?
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.
Do you handle building control in Rhiwbina?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.