Two-storey extensions in Cobham
Everything for a two-storey extension in Cobham, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Cobham at a glance
- Postcode districts
- KT11
- Area
- Surrey, England
- Price region
- South East England
- Nearest towns
- Esher (3.3 miles), Weybridge (3.6 miles), Great Bookham (3.9 miles), Walton-on-Thames (3.9 miles)
- Distance to Woking
- about 6.4 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 Cobham we also work in Esher, Weybridge and Great Bookham, and across the rest of Surrey. Postcode district in and near Cobham: KT11.
Extensions available in Cobham
Two-storey rear extensions
Cobham guide price from £61,500, Standard spec.
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Two-storey side extensions
From £94,500 in Cobham. Free visit to firm it up.
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Two-storey wraparound extensions
For homes in Cobham: typical guide from £132,500.
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Part single, part two-storey extensions
Our South East England guide starts at £79,000 for this type.
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Extensions over a garage
Design, approvals and build for Cobham homes. Guide from £34,500.
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First-floor extensions
For homes in Cobham: typical guide from £27,500.
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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 Cobham: typical guide from £94,500.
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Kitchen extensions with bedrooms above
Our South East England guide starts at £61,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
For homes in Cobham: typical guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
Which type suits your house in Cobham 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 Cobham
Cobham 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 Cobham
Do you cover Cobham?
Yes. We cover Cobham (KT11) and the surrounding area, including Esher and Weybridge. The first site visit is free.
What does a two-storey extension cost in Cobham?
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 Cobham do you cover?
Everywhere around it, including Esher (3.3 miles), Weybridge (3.6 miles) and Great Bookham (3.9 miles), and the rest of Surrey.