Llantwit Major, Cardiff and the Vale
Two-storey rear extension in Llantwit Major
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. If you live in Llantwit Major 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.
Llantwit Major is covered from our Cardiff and the Vale round, including CF61. Two-storey rear extensions suit semi-detached houses in Llantwit Major best, where the extra bedroom matters as much as the bigger kitchen.
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 Llantwit Major?
In Llantwit Major, 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 Llantwit Major?
The planning route for a two-storey rear extension in Llantwit Major is set by Wales's householder rules and your council.
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. 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 Llantwit Major like to extend?
Older terraces near the centre and post-war semis further out are typical of Llantwit Major. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
How a two-storey rear extension in Llantwit Major 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
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 Llantwit Major
Neighbouring places we cover include Bridgend (7.6 miles) and Coity (8.2 miles).
- Two-storey rear extension in Bridgend
- Two-storey rear extension in Coity
- Two-storey rear extension in Barry
- Two-storey rear extension in Aberkenfig
- Two-storey rear extension in Llantrisant
Other work in Llantwit Major:
FAQ
Two-storey rear extension questions in Llantwit Major
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 Llantwit Major 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.
What postcode areas do you cover around Llantwit Major?
Including CF61, and the surrounding Cardiff and the Vale area.
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.
Can you match the brick or stone on my Llantwit Major house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.