Two-storey extensions in Cowley
Need more room in Cowley? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Cowley at a glance
- Postcode districts
- OX4, OX33 and OX44
- Area
- Oxfordshire, England
- Price region
- South East England
- Nearest towns
- Oxford (2.5 miles), Abingdon (5.3 miles), Kidlington (7.1 miles), Didcot (8.6 miles)
- Distance to Oxford
- about 2.5 miles
- Approvals
- Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission.
We cover Cowley (OX4, OX33 and OX44) and the places around it, including Oxford (2.5 miles), Abingdon (5.3 miles) and Kidlington.
Extensions available in Cowley
Two-storey rear extensions
Guide from £61,500 in Cowley, including VAT.
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Two-storey side extensions
Guide from £94,500 in Cowley, including VAT.
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Two-storey wraparound extensions
Guide from £132,500 in Cowley, including VAT.
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Part single, part two-storey extensions
Cowley guide price from £79,000, Standard spec.
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Extensions over a garage
Guide from £34,500 in Cowley, including VAT.
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First-floor extensions
Design, approvals and build for Cowley homes. Guide from £27,500.
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Two-storey extensions for semi-detached houses
For homes in Cowley: typical guide from £61,500.
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Two-storey extensions for detached houses
Cowley guide price from £94,500, Standard spec.
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Kitchen extensions with bedrooms above
Guide from £61,500 (before kitchen units) in Cowley, including VAT.
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Extra bedroom and en-suite extensions
Design, approvals and build for Cowley homes. Guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Oxfordshire, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
Also available in Oxfordshire
- 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 Cowley
Cowley is in England. Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission. Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
The full England rules explained
Questions about extensions in Cowley
Do you cover Cowley?
Yes. We cover Cowley (OX4, OX33 and OX44) and the surrounding area, including Oxford and Abingdon. The first site visit is free.
What does a two-storey extension cost in Cowley?
Using our South East England 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 £61,500–£83,000 including VAT. An extension over a garage is about £34,500–£50,500.
Which other places near Cowley do you cover?
Everywhere around it, including Oxford (2.5 miles), Abingdon (5.3 miles) and Kidlington (7.1 miles), and the rest of Oxfordshire.