Two-storey extensions in Walton-on-Thames
We design, get approval for and build two-storey extensions in Walton-on-Thames and the surrounding area. Choose the type of extension below or book a free site visit.
Walton-on-Thames at a glance
- Postcode districts
- KT12
- Area
- Surrey, England
- Price region
- South East England
- Nearest towns
- Sunbury-on-Thames (1.2 miles), Shepperton (1.7 miles), West Molesey (1.7 miles), Weybridge (2.3 miles)
- Distance to Woking
- about 7.8 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.
Walton-on-Thames sits about 7.8 miles from Woking. Closer to home, Sunbury-on-Thames is 1.2 miles away and Shepperton 1.7 miles.
Extensions available in Walton-on-Thames
Two-storey rear extensions
For homes in Walton-on-Thames: typical guide from £61,500.
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Two-storey side extensions
Design, approvals and build for Walton-on-Thames homes. Guide from £94,500.
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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
From £79,000 in Walton-on-Thames. Free visit to firm it up.
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Extensions over a garage
For homes in Walton-on-Thames: typical guide from £34,500.
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First-floor extensions
From £27,500 in Walton-on-Thames. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Our South East England guide starts at £61,500 for this type.
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Two-storey extensions for detached houses
For homes in Walton-on-Thames: typical guide from £94,500.
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Kitchen extensions with bedrooms above
Design, approvals and build for Walton-on-Thames homes. Guide from £61,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Walton-on-Thames guide price from £61,500 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
Which type suits your house in Walton-on-Thames 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 Surrey
- 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 Walton-on-Thames
Walton-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 Walton-on-Thames
Do you cover Walton-on-Thames?
Yes. We cover Walton-on-Thames (KT12) and the surrounding area, including Sunbury-on-Thames and Shepperton. The first site visit is free.
What does a two-storey extension cost in Walton-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 Walton-on-Thames do you cover?
Everywhere around it, including Sunbury-on-Thames (1.2 miles), Shepperton (1.7 miles) and West Molesey (1.7 miles), and the rest of Surrey.