Two-storey extensions in Henley-on-Thames
Everything for a two-storey extension in Henley-on-Thames, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Henley-on-Thames at a glance
- Postcode districts
- RG9
- Area
- Oxfordshire, England
- Price region
- South East England
- Nearest towns
- Marlow (5.9 miles), Reading (6.1 miles), Lower Earley (7.4 miles), Maidenhead (7.8 miles)
- Distance to Oxford
- about 21.5 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.
Around Henley-on-Thames we also work in Marlow, Reading and Lower Earley, and across the rest of Oxfordshire. Postcode district in and near Henley-on-Thames: RG9.
Extensions available in Henley-on-Thames
Two-storey rear extensions
For homes in Henley-on-Thames: typical guide from £61,500.
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Two-storey side extensions
From £94,500 in Henley-on-Thames. Free visit to firm it up.
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Two-storey wraparound extensions
Our South East England guide starts at £132,500 for this type.
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Part single, part two-storey extensions
For homes in Henley-on-Thames: typical guide from £79,000.
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Extensions over a garage
Design, approvals and build for Henley-on-Thames homes. Guide from £34,500.
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First-floor extensions
Design, approvals and build for Henley-on-Thames homes. Guide from £27,500.
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Two-storey extensions for semi-detached houses
Henley-on-Thames guide price from £61,500, Standard spec.
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Two-storey extensions for detached houses
Our South East England guide starts at £94,500 for this type.
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Kitchen extensions with bedrooms above
Guide from £61,500 (before kitchen units) in Henley-on-Thames, including VAT.
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Extra bedroom and en-suite extensions
Design, approvals and build for Henley-on-Thames 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 Henley-on-Thames
Henley-on-Thames 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 Henley-on-Thames
Do you cover Henley-on-Thames?
Yes. We cover Henley-on-Thames (RG9) and the surrounding area, including Marlow and Reading. The first site visit is free.
What does a two-storey extension cost in Henley-on-Thames?
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 Henley-on-Thames do you cover?
Everywhere around it, including Marlow (5.9 miles), Reading (6.1 miles) and Lower Earley (7.4 miles), and the rest of Oxfordshire.