Two-storey extensions in Cardiff
Planning a bigger home in Cardiff? Compare extension types and guide prices below, then book a free site visit.
Cardiff at a glance
- Postcode districts
- CF10, CF11 and CF24
- Area
- Cardiff and the Vale of Glamorgan, Wales
- Price region
- Wales
- Nearest towns
- Llandaff (1.9 miles), Whitchurch (Cardiff and the Vale of Glamorgan) (2.8 miles), Penarth (2.9 miles), Dinas Powys (3.4 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 postcode districts CF10, CF11 and CF24 in and around Cardiff, along with neighbouring Llandaff, Whitchurch (Cardiff and the Vale of Glamorgan) and Penarth.
Extensions available in Cardiff
Two-storey rear extensions
Design, approvals and build for Cardiff homes. Guide from £51,500.
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Two-storey side extensions
From £79,000 in Cardiff. Free visit to firm it up.
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Two-storey wraparound extensions
Design, approvals and build for Cardiff homes. Guide from £111,000.
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Part single, part two-storey extensions
Guide from £66,000 in Cardiff, including VAT.
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Extensions over a garage
For homes in Cardiff: typical guide from £29,000.
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First-floor extensions
For homes in Cardiff: typical guide from £23,000.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Cardiff homes. Guide from £51,500.
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Two-storey extensions for detached houses
For homes in Cardiff: typical guide from £79,000.
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Kitchen extensions with bedrooms above
From £51,500 (before kitchen units) in Cardiff. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Guide from £51,500 (plus en-suite) in Cardiff, including VAT.
Learn moreWhich type suits your house?
Which type suits your house in Cardiff 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 Cardiff and the Vale of Glamorgan
- 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 Cardiff
Cardiff 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 Cardiff
Do you cover Cardiff?
Yes. We cover Cardiff (CF10, CF11 and CF24) and the surrounding area, including Llandaff and Whitchurch (Cardiff and the Vale of Glamorgan). The first site visit is free.
What does a two-storey extension cost in Cardiff?
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 Cardiff do you cover?
Everywhere around it, including Llandaff (1.9 miles), Whitchurch (Cardiff and the Vale of Glamorgan) (2.8 miles) and Penarth (2.9 miles), and the rest of Cardiff and the Vale of Glamorgan.