Coity, South Wales Valleys
Two-storey rear extension in Coity
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. If you live in Coity and want to know what a two-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
We cover Coity (CF31, CF32 and CF35) as part of our South Wales Valleys work. In the South Wales Valleys we check the neighbours' rear windows first, because the upper floor is where most two-storey schemes win or lose planning.
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 Coity?
For Coity we work from the Wales rate: £1,670–£2,510 per square metre of new floor, including VAT, 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 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a two-storey rear extension in Coity?
The planning route for a two-storey rear extension in Coity is set by Wales's householder rules and your council.
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. At the first visit we measure what is there now and tell you which route fits: permitted development or a householder planning application.
What are homes in Coity like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Coity. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a two-storey rear extension in Coity 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.
Paperwork handled
Planning or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
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 Coity
Neighbouring places we cover include Bridgend (1.5 miles) and Aberkenfig (2.1 miles).
- Two-storey rear extension in Bridgend
- Two-storey rear extension in Aberkenfig
- Two-storey rear extension in Pyle
- Two-storey rear extension in Porthcawl
- Two-storey rear extension in Maesteg
Other work in Coity:
FAQ
Two-storey rear extension questions in Coity
Do you handle building control in Coity?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
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.
Will we need to move out?
Rarely. The first-floor opening is made late in the job and sealed with temporary screens.
Can you match the brick or stone on my Coity house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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 two-storey rear extension cost in Coity?
As a guide, £1,670–£2,510 per square metre including VAT for a standard specification. For example, 3 m × 5 m footprint, two floors (30 m²): about £50,000–£75,500 at that rate. Your written price follows the survey.