Two-storey extensions in Wallington
We design, get approval for and build two-storey extensions in Wallington and the surrounding area. Choose the type of extension below or book a free site visit.
Wallington at a glance
- Postcode districts
- SM6
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Carshalton (0.7 miles), St Helier (1.8 miles), Sutton (2.2 miles), Belmont (Greater London) (2.5 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 postcode district SM6 in and around Wallington, along with neighbouring Carshalton, St Helier and Sutton.
Extensions available in Wallington
Two-storey rear extensions
From £67,000 in Wallington. Free visit to firm it up.
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Two-storey side extensions
Our London guide starts at £103,500 for this type.
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Two-storey wraparound extensions
Guide from £144,500 in Wallington, including VAT.
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Part single, part two-storey extensions
Guide from £86,500 in Wallington, including VAT.
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Extensions over a garage
For homes in Wallington: typical guide from £38,000.
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First-floor extensions
Design, approvals and build for Wallington homes. Guide from £30,000.
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Two-storey extensions for semi-detached houses
Guide from £67,000 in Wallington, including VAT.
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Two-storey extensions for detached houses
Wallington guide price from £103,500, Standard spec.
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Kitchen extensions with bedrooms above
Wallington guide price from £67,000 (before kitchen units), Standard spec.
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Extra bedroom and en-suite extensions
Design, approvals and build for Wallington homes. Guide from £67,000 (plus en-suite).
Learn moreWhich type suits your house?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in Wallington, with a rough idea of the approval route and cost for each.
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 Wallington
Wallington 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 Wallington
Do you cover Wallington?
Yes. We cover Wallington (SM6) and the surrounding area, including Carshalton and St Helier. The first site visit is free.
What does a two-storey extension cost in Wallington?
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 Wallington do you cover?
Everywhere around it, including Carshalton (0.7 miles), St Helier (1.8 miles) and Sutton (2.2 miles), and the rest of Greater London.