Two-storey extensions in Chiswick
We design, get approval for and build two-storey extensions in Chiswick and the surrounding area. Choose the type of extension below or book a free site visit.
Chiswick at a glance
- Postcode districts
- W4
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Acton (1.4 miles), Barnes (1.4 miles), Kew (1.5 miles), Mortlake (1.7 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 Chiswick (W4) and the places around it, including Acton (1.4 miles), Barnes (1.4 miles) and Kew.
Extensions available in Chiswick
Two-storey rear extensions
For homes in Chiswick: typical guide from £67,000.
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Two-storey side extensions
Chiswick guide price from £103,500, Standard spec.
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Two-storey wraparound extensions
Chiswick guide price from £144,500, Standard spec.
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Part single, part two-storey extensions
Our London guide starts at £86,500 for this type.
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Extensions over a garage
From £38,000 in Chiswick. Free visit to firm it up.
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First-floor extensions
Design, approvals and build for Chiswick homes. Guide from £30,000.
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Two-storey extensions for semi-detached houses
From £67,000 in Chiswick. Free visit to firm it up.
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Two-storey extensions for detached houses
Our London guide starts at £103,500 for this type.
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Kitchen extensions with bedrooms above
Design, approvals and build for Chiswick homes. Guide from £67,000 (before kitchen units).
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Extra bedroom and en-suite extensions
Our London guide starts at £67,000 (plus en-suite) for this type.
Learn moreWhich type suits your house?
Which type suits your house in Chiswick 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 Greater London
- 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 Chiswick
Chiswick 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 Chiswick
Do you cover Chiswick?
Yes. We cover Chiswick (W4) and the surrounding area, including Acton and Barnes. The first site visit is free.
What does a two-storey extension cost in Chiswick?
Using our London 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 £67,000–£90,500 including VAT. An extension over a garage is about £38,000–£55,000.
Which other places near Chiswick do you cover?
Everywhere around it, including Acton (1.4 miles), Barnes (1.4 miles) and Kew (1.5 miles), and the rest of Greater London.