Two-storey extensions in Dagenham
Everything for a two-storey extension in Dagenham, in one place: types, guide prices for London, the approval rules in England and how to get started.
Dagenham at a glance
- Postcode districts
- RM10
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Elm Park (1.3 miles), Becontree (1.6 miles), Romford (1.9 miles), Chadwell Heath (2.1 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 RM10 in and around Dagenham, along with neighbouring Elm Park, Becontree and Romford.
Extensions available in Dagenham
Two-storey rear extensions
Design, approvals and build for Dagenham homes. 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
Guide from £144,500 in Dagenham, including VAT.
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Part single, part two-storey extensions
Guide from £86,500 in Dagenham, including VAT.
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Extensions over a garage
Design, approvals and build for Dagenham homes. Guide from £38,000.
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First-floor extensions
Dagenham guide price from £30,000, Standard spec.
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Two-storey extensions for semi-detached houses
Guide from £67,000 in Dagenham, including VAT.
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Two-storey extensions for detached houses
From £103,500 in Dagenham. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Guide from £67,000 (before kitchen units) in Dagenham, including VAT.
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Extra bedroom and en-suite extensions
Dagenham guide price from £67,000 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Greater London, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
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 Dagenham
Dagenham 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 Dagenham
Do you cover Dagenham?
Yes. We cover Dagenham (RM10) and the surrounding area, including Elm Park and Becontree. The first site visit is free.
What does a two-storey extension cost in Dagenham?
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 Dagenham do you cover?
Everywhere around it, including Elm Park (1.3 miles), Becontree (1.6 miles) and Romford (1.9 miles), and the rest of Greater London.