Two-storey extensions in Sidcup
We design, get approval for and build two-storey extensions in Sidcup and the surrounding area. Choose the type of extension below or book a free site visit.
Sidcup at a glance
- Postcode districts
- DA14 and DA15
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Chislehurst (1.6 miles), Bexley (2.2 miles), Welling (2.5 miles), Eltham (2.8 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 districts DA14 and DA15 in and around Sidcup, along with neighbouring Chislehurst, Bexley and Welling.
Extensions available in Sidcup
Two-storey rear extensions
For homes in Sidcup: typical guide from £67,000.
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Two-storey side extensions
Design, approvals and build for Sidcup homes. Guide from £103,500.
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Two-storey wraparound extensions
Our London guide starts at £144,500 for this type.
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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
Guide from £38,000 in Sidcup, including VAT.
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First-floor extensions
Sidcup guide price from £30,000, Standard spec.
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Two-storey extensions for semi-detached houses
For homes in Sidcup: typical guide from £67,000.
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Two-storey extensions for detached houses
For homes in Sidcup: typical guide from £103,500.
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Kitchen extensions with bedrooms above
From £67,000 (before kitchen units) in Sidcup. Free visit to firm it up.
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Extra bedroom and en-suite extensions
For homes in Sidcup: typical 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 Sidcup 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 Sidcup
Sidcup 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 Sidcup
Do you cover Sidcup?
Yes. We cover Sidcup (DA14 and DA15) and the surrounding area, including Chislehurst and Bexley. The first site visit is free.
What does a two-storey extension cost in Sidcup?
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 Sidcup do you cover?
Everywhere around it, including Chislehurst (1.6 miles), Bexley (2.2 miles) and Welling (2.5 miles), and the rest of Greater London.