Two-storey extensions in Coulsdon
Everything for a two-storey extension in Coulsdon, in one place: types, guide prices for London, the approval rules in England and how to get started.
Coulsdon at a glance
- Postcode districts
- CR5
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Purley (1.7 miles), Kenley (1.8 miles), Banstead (2.9 miles), Sanderstead (2.9 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 Coulsdon we also work in Purley, Kenley and Banstead, and across the rest of Greater London. Postcode district in and near Coulsdon: CR5.
Extensions available in Coulsdon
Two-storey rear extensions
Our London guide starts at £67,000 for this type.
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Two-storey side extensions
From £103,500 in Coulsdon. Free visit to firm it up.
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Two-storey wraparound extensions
Guide from £144,500 in Coulsdon, including VAT.
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Part single, part two-storey extensions
Coulsdon guide price from £86,500, Standard spec.
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Extensions over a garage
From £38,000 in Coulsdon. Free visit to firm it up.
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First-floor extensions
From £30,000 in Coulsdon. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Our London guide starts at £67,000 for this type.
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Two-storey extensions for detached houses
Design, approvals and build for Coulsdon homes. Guide from £103,500.
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Kitchen extensions with bedrooms above
Our London guide starts at £67,000 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
Design, approvals and build for Coulsdon homes. Guide from £67,000 (plus en-suite).
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Coulsdon we also design annexes, home offices and bedrooms over garages.
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 Coulsdon
Coulsdon 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 Coulsdon
Do you cover Coulsdon?
Yes. We cover Coulsdon (CR5) and the surrounding area, including Purley and Kenley. The first site visit is free.
What does a two-storey extension cost in Coulsdon?
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 Coulsdon do you cover?
Everywhere around it, including Purley (1.7 miles), Kenley (1.8 miles) and Banstead (2.9 miles), and the rest of Greater London.