Two-storey extensions in Cockfosters
Need more room in Cockfosters? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Cockfosters at a glance
- Postcode districts
- EN4
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- East Barnet (0.6 miles), Oakwood (Greater London) (0.7 miles), New Barnet (1.2 miles), Hadley Wood (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 postcode district EN4 in and around Cockfosters, along with neighbouring East Barnet, Oakwood (Greater London) and New Barnet.
Extensions available in Cockfosters
Two-storey rear extensions
From £67,000 in Cockfosters. Free visit to firm it up.
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Two-storey side extensions
For homes in Cockfosters: typical guide from £103,500.
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Two-storey wraparound extensions
Design, approvals and build for Cockfosters homes. Guide from £144,500.
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Part single, part two-storey extensions
From £86,500 in Cockfosters. Free visit to firm it up.
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Extensions over a garage
Our London guide starts at £38,000 for this type.
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First-floor extensions
For homes in Cockfosters: typical guide from £30,000.
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Two-storey extensions for semi-detached houses
Cockfosters guide price from £67,000, Standard spec.
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Two-storey extensions for detached houses
From £103,500 in Cockfosters. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Guide from £67,000 (before kitchen units) in Cockfosters, including VAT.
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Extra bedroom and en-suite extensions
Cockfosters guide price from £67,000 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Cockfosters we measure distances to every boundary before suggesting a type.
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 Cockfosters
Cockfosters 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 Cockfosters
Do you cover Cockfosters?
Yes. We cover Cockfosters (EN4) and the surrounding area, including East Barnet and Oakwood (Greater London). The first site visit is free.
What does a two-storey extension cost in Cockfosters?
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 Cockfosters do you cover?
Everywhere around it, including East Barnet (0.6 miles), Oakwood (Greater London) (0.7 miles) and New Barnet (1.2 miles), and the rest of Greater London.