Two-storey extensions in Caerphilly
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Caerphilly.
Caerphilly at a glance
- Postcode districts
- CF83
- Area
- Gwent, Wales
- Price region
- Wales
- Nearest towns
- Bedwas (1.5 miles), Thornhill (2.5 miles), Abertridwr (2.6 miles), Rhiwbina (3.2 miles)
- Distance to Newport (Gwent)
- about 9.5 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.
We cover Caerphilly (CF83) and the places around it, including Bedwas (1.5 miles), Thornhill (2.5 miles) and Abertridwr.
Extensions available in Caerphilly

Two-storey rear extensions
Our Wales guide starts at £51,500 for this type.
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Two-storey side extensions
Caerphilly guide price from £79,000, Standard spec.
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Two-storey wraparound extensions
Our Wales guide starts at £111,000 for this type.
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Part single, part two-storey extensions
Guide from £66,000 in Caerphilly, including VAT.
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Extensions over a garage
Caerphilly guide price from £29,000, Standard spec.
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First-floor extensions
Guide from £23,000 in Caerphilly, including VAT.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Caerphilly homes. Guide from £51,500.
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Two-storey extensions for detached houses
For homes in Caerphilly: typical guide from £79,000.
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Kitchen extensions with bedrooms above
Guide from £51,500 (before kitchen units) in Caerphilly, including VAT.
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Extra bedroom and en-suite extensions
From £51,500 (plus en-suite) in Caerphilly. Free visit to firm it up.
Learn moreWhich type suits your house?
Which type suits your house in Caerphilly depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
Also available in Gwent
- 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 Caerphilly
Caerphilly 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 Caerphilly
Do you cover Caerphilly?
Yes. We cover Caerphilly (CF83) and the surrounding area, including Bedwas and Thornhill. The first site visit is free.
What does a two-storey extension cost in Caerphilly?
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 Caerphilly do you cover?
Everywhere around it, including Bedwas (1.5 miles), Thornhill (2.5 miles) and Abertridwr (2.6 miles), and the rest of Gwent.