Whitchurch, Cardiff and the Vale
Two-storey rear extension in Whitchurch
Two-storey rear extension in Whitchurch: a larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. We measure the house, show you what the rules allow, price it in writing and build it.
Whitchurch sits in Cardiff and the Vale, with postcode districts including CF5, CF14 and CF15. In Whitchurch, a two-storey rear extension is worth comparing with the cost of moving once stamp duty, agents' and legal fees are counted.
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 two-storey rear extension cost in Whitchurch?
In Whitchurch, our guide for a two-storey rear extension is £1,670–£2,510 per square metre including VAT for a standard specification. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £50,000–£75,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £80,500–£120,500 |
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 two-storey rear extension in Whitchurch?
Whether your two-storey rear extension in Whitchurch needs a planning application depends on its size, your house and any local restrictions.
Welsh rules allow a two-storey rear extension without an application only where the ground floor is no deeper than 4 metres, the upper floor no deeper than 3 metres and at least 10.5 metres remains to the rear boundary. Most homeowners still apply for householder planning permission.
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 Whitchurch like to extend?
Older terraces near the centre and post-war semis further out are typical of Whitchurch. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
How a two-storey rear extension in Whitchurch 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
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.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Two-storey rear extensions near Whitchurch
We also build two-storey rear extensions in nearby Rhiwbina (1.2 miles) and Cardiff (2.8 miles).
- Two-storey rear extension in Rhiwbina
- Two-storey rear extension in Cardiff
- Two-storey rear extension in Caerphilly
- Two-storey rear extension in Penarth
- Two-storey rear extension in Llantrisant
Other work in Whitchurch:
FAQ
Two-storey rear extension questions in Whitchurch
Do I need planning permission for a rear extension in Whitchurch?
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.
Do you handle building control in Whitchurch?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
What is the 45-degree rule?
Many councils check that a two-storey extension does not cross a 45-degree line drawn from the nearest habitable window of the neighbouring house. We test it at the first drawing.
What postcode areas do you cover around Whitchurch?
Including CF5, CF14 and CF15, and the surrounding Cardiff and the Vale area.
Is the site visit in Whitchurch free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
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.