Two-storey extensions in East Barnet
Everything for a two-storey extension in East Barnet, in one place: types, guide prices for London, the approval rules in England and how to get started.
East Barnet at a glance
- Postcode districts
- EN4
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Cockfosters (0.6 miles), New Barnet (0.6 miles), Oakwood (Greater London) (1.3 miles), Hadley Wood (1.4 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 East Barnet, along with neighbouring Cockfosters, New Barnet and Oakwood (Greater London).
Extensions available in East Barnet
Two-storey rear extensions
For homes in East Barnet: typical guide from £67,000.
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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
Design, approvals and build for East Barnet homes. Guide from £144,500.
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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 East Barnet. Free visit to firm it up.
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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
For homes in East Barnet: typical guide from £67,000.
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Two-storey extensions for detached houses
Guide from £103,500 in East Barnet, including VAT.
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Kitchen extensions with bedrooms above
For homes in East Barnet: typical guide from £67,000 (before kitchen units).
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Extra bedroom and en-suite extensions
Guide from £67,000 (plus en-suite) in East Barnet, including VAT.
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 East Barnet, 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 East Barnet
East Barnet 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 East Barnet
Do you cover East Barnet?
Yes. We cover East Barnet (EN4) and the surrounding area, including Cockfosters and New Barnet. The first site visit is free.
What does a two-storey extension cost in East Barnet?
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 East Barnet do you cover?
Everywhere around it, including Cockfosters (0.6 miles), New Barnet (0.6 miles) and Oakwood (Greater London) (1.3 miles), and the rest of Greater London.