Two-storey extensions in Erith
Need more room in Erith? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Erith at a glance
- Postcode districts
- DA8
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Belvedere (1.2 miles), Rainham (2.5 miles), Thamesmead (2.8 miles), Abbey Wood (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.
We cover postcode district DA8 in and around Erith, along with neighbouring Belvedere, Rainham and Thamesmead.
Extensions available in Erith
Two-storey rear extensions
Erith guide price from £67,000, Standard spec.
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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 Erith, including VAT.
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Part single, part two-storey extensions
For homes in Erith: typical guide from £86,500.
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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
Our London guide starts at £30,000 for this type.
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Two-storey extensions for semi-detached houses
From £67,000 in Erith. Free visit to firm it up.
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Two-storey extensions for detached houses
From £103,500 in Erith. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Design, approvals and build for Erith homes. Guide from £67,000 (before kitchen units).
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Extra bedroom and en-suite extensions
Erith 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 Erith
Erith 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 Erith
Do you cover Erith?
Yes. We cover Erith (DA8) and the surrounding area, including Belvedere and Rainham. The first site visit is free.
What does a two-storey extension cost in Erith?
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 Erith do you cover?
Everywhere around it, including Belvedere (1.2 miles), Rainham (2.5 miles) and Thamesmead (2.8 miles), and the rest of Greater London.