Two-storey extensions in Thornhill
Planning a bigger home in Thornhill? Compare extension types and guide prices below, then book a free site visit.
Thornhill at a glance
- Postcode districts
- CF3 and CF23
- Area
- Cardiff and the Vale of Glamorgan, Wales
- Price region
- Wales
- Nearest towns
- Rhiwbina (1.3 miles), Whitchurch (Cardiff and the Vale of Glamorgan) (2.4 miles), Caerphilly (2.5 miles), Bedwas (3.5 miles)
- Distance to Cardiff
- about 4.3 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 Thornhill we also work in Rhiwbina, Whitchurch (Cardiff and the Vale of Glamorgan) and Caerphilly, and across the rest of Cardiff and the Vale of Glamorgan. Postcode districts in and near Thornhill: CF3 and CF23.
Extensions available in Thornhill
Two-storey rear extensions
Thornhill guide price from £51,500, Standard spec.
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Two-storey side extensions
Guide from £79,000 in Thornhill, including VAT.
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Two-storey wraparound extensions
Guide from £111,000 in Thornhill, including VAT.
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Part single, part two-storey extensions
For homes in Thornhill: typical guide from £66,000.
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Extensions over a garage
From £29,000 in Thornhill. Free visit to firm it up.
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First-floor extensions
Thornhill guide price from £23,000, Standard spec.
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Two-storey extensions for semi-detached houses
Guide from £51,500 in Thornhill, including VAT.
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Two-storey extensions for detached houses
Thornhill guide price from £79,000, Standard spec.
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Kitchen extensions with bedrooms above
From £51,500 (before kitchen units) in Thornhill. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Design, approvals and build for Thornhill homes. Guide from £51,500 (plus en-suite).
Learn moreWhich type suits your house?
Which type suits your house in Thornhill 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 Thornhill
Thornhill 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 Thornhill
Do you cover Thornhill?
Yes. We cover Thornhill (CF3 and CF23) and the surrounding area, including Rhiwbina and Whitchurch (Cardiff and the Vale of Glamorgan). The first site visit is free.
What does a two-storey extension cost in Thornhill?
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 Thornhill do you cover?
Everywhere around it, including Rhiwbina (1.3 miles), Whitchurch (Cardiff and the Vale of Glamorgan) (2.4 miles) and Caerphilly (2.5 miles), and the rest of Cardiff and the Vale of Glamorgan.