Two-storey extensions in Thornton Heath
We design, get approval for and build two-storey extensions in Thornton Heath and the surrounding area. Choose the type of extension below or book a free site visit.
Thornton Heath at a glance
- Postcode districts
- CR7
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- South Norwood (1 mile), Croydon (1.1 miles), Upper Norwood (1.2 miles), Norbury (1.5 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 Thornton Heath (CR7) and the places around it, including South Norwood (1.0 miles), Croydon (1.1 miles) and Upper Norwood.
Extensions available in Thornton Heath
Two-storey rear extensions
Thornton Heath guide price from £67,000, Standard spec.
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Two-storey side extensions
From £103,500 in Thornton Heath. Free visit to firm it up.
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Two-storey wraparound extensions
Thornton Heath guide price from £144,500, Standard spec.
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Part single, part two-storey extensions
Guide from £86,500 in Thornton Heath, including VAT.
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Extensions over a garage
Thornton Heath guide price from £38,000, Standard spec.
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First-floor extensions
Our London guide starts at £30,000 for this type.
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Two-storey extensions for semi-detached houses
Guide from £67,000 in Thornton Heath, including VAT.
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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
Guide from £67,000 (before kitchen units) in Thornton Heath, including VAT.
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Extra bedroom and en-suite extensions
From £67,000 (plus en-suite) in Thornton Heath. Free visit to firm it up.
Learn moreWhich type suits your house?
Which type suits your house in Thornton Heath 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 Thornton Heath
Thornton Heath 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 Thornton Heath
Do you cover Thornton Heath?
Yes. We cover Thornton Heath (CR7) and the surrounding area, including South Norwood and Croydon. The first site visit is free.
What does a two-storey extension cost in Thornton Heath?
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 Thornton Heath do you cover?
Everywhere around it, including South Norwood (1 mile), Croydon (1.1 miles) and Upper Norwood (1.2 miles), and the rest of Greater London.