Gelligaer, South Wales Valleys
Two-storey rear extension in Gelligaer
We plan and build two-storey rear extensions for homeowners in Gelligaer. A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. Start with a free site visit, then a written price once the design is agreed.
Gelligaer sits in the South Wales Valleys, with postcode districts including CF82. In Gelligaer, 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 Gelligaer?
In Gelligaer, 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a two-storey rear extension in Gelligaer?
Planning for a two-storey rear extension in Gelligaer follows the Welsh householder rules.
In Wales a rear extension of more than one storey can be permitted development if the ground floor projects no more than 4 metres and the upper floor no more than 3 metres, with at least 10.5 metres to the rear boundary. It is not permitted development in conservation areas, National Parks or National Landscapes, so many double-storey schemes need a householder application.
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 Gelligaer like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Gelligaer. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a two-storey rear extension in Gelligaer 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.
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.
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.
Two-storey rear extensions near Gelligaer
We also build two-storey rear extensions in nearby Nelson (1.4 miles) and Bargoed (1.6 miles).
- Two-storey rear extension in Nelson
- Two-storey rear extension in Bargoed
- Two-storey rear extension in Blackwood
- Two-storey rear extension in Treharris
- Two-storey rear extension in Abercarn
Other work in Gelligaer:
FAQ
Two-storey rear extension questions in Gelligaer
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.
Is the site visit in Gelligaer free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
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.
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.
Do you handle building control in Gelligaer?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
How much does a two-storey rear extension cost in Gelligaer?
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.