Two-storey extensions in Carmarthen
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Carmarthen.
Carmarthen at a glance
- Postcode districts
- SA31, SA32 and SA33
- Area
- Dyfed, Wales
- Price region
- Wales
- Nearest towns
- Tumble (9.7 miles), Cross Hands (10.3 miles), Burry Port (12.1 miles), Llangeler (12.2 miles)
- Distance to Llanelli
- about 13.5 miles
- Approvals
- Two-storey rear: ground floor up to 4 m, first floor up to 3 m and 10.5 m from the rear boundary. Some two-storey side extensions can be permitted development.
Around Carmarthen we also work in Tumble, Cross Hands and Burry Port, and across the rest of Dyfed. Postcode districts in and near Carmarthen: SA31, SA32 and SA33.
Extensions available in Carmarthen

Two-storey rear extensions
For homes in Carmarthen: typical guide from £51,500.
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Two-storey side extensions
Guide from £79,000 in Carmarthen, including VAT.
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Two-storey wraparound extensions
For homes in Carmarthen: typical guide from £111,000.
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Part single, part two-storey extensions
Our Wales guide starts at £66,000 for this type.
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Extensions over a garage
Guide from £29,000 in Carmarthen, including VAT.
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First-floor extensions
For homes in Carmarthen: typical guide from £23,000.
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Two-storey extensions for semi-detached houses
From £51,500 in Carmarthen. Free visit to firm it up.
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Two-storey extensions for detached houses
Design, approvals and build for Carmarthen homes. Guide from £79,000.
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Kitchen extensions with bedrooms above
From £51,500 (before kitchen units) in Carmarthen. Free visit to firm it up.
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Extra bedroom and en-suite extensions
From £51,500 (plus en-suite) in Carmarthen. Free visit to firm it up.
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Carmarthen we also design annexes, home offices and bedrooms over garages.
Also available in Dyfed
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Party wall notices for extensions
- Design and build two-storey extensions
Rules for Carmarthen
Carmarthen is in Wales. Two-storey rear: ground floor up to 4 m, first floor up to 3 m and 10.5 m from the rear boundary. Some two-storey side extensions can be permitted development. Householder planning application: £585. Councils normally decide householder applications within 8 weeks.
The full Wales rules explained
Questions about extensions in Carmarthen
Do you cover Carmarthen?
Yes. We cover Carmarthen (SA31, SA32 and SA33) and the surrounding area, including Tumble and Cross Hands. The first site visit is free.
What does a two-storey extension cost in Carmarthen?
Using our Wales guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £51,500–£69,500 including VAT. An extension over a garage is about £29,000–£42,000.
Which other places near Carmarthen do you cover?
Everywhere around it, including Tumble (9.7 miles), Cross Hands (10.3 miles) and Burry Port (12.1 miles), and the rest of Dyfed.