Two-storey extensions in Mottingham
Need more room in Mottingham? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Mottingham at a glance
- Postcode districts
- SE12
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Eltham (0.6 miles), Kidbrooke (1.1 miles), Lee (1.5 miles), Blackheath (1.6 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.
Around Mottingham we also work in Eltham, Kidbrooke and Lee, and across the rest of Greater London. Postcode district in and near Mottingham: SE12.
Extensions available in Mottingham
Two-storey rear extensions
Design, approvals and build for Mottingham homes. Guide from £67,000.
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Two-storey side extensions
Guide from £103,500 in Mottingham, including VAT.
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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
From £86,500 in Mottingham. Free visit to firm it up.
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Extensions over a garage
Mottingham guide price from £38,000, Standard spec.
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First-floor extensions
Design, approvals and build for Mottingham homes. Guide from £30,000.
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Two-storey extensions for semi-detached houses
For homes in Mottingham: typical guide from £67,000.
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Two-storey extensions for detached houses
Guide from £103,500 in Mottingham, including VAT.
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Kitchen extensions with bedrooms above
Design, approvals and build for Mottingham homes. Guide from £67,000 (before kitchen units).
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Extra bedroom and en-suite extensions
Design, approvals and build for Mottingham homes. 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 Mottingham 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 Mottingham
Mottingham 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 Mottingham
Do you cover Mottingham?
Yes. We cover Mottingham (SE12) and the surrounding area, including Eltham and Kidbrooke. The first site visit is free.
What does a two-storey extension cost in Mottingham?
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 Mottingham do you cover?
Everywhere around it, including Eltham (0.6 miles), Kidbrooke (1.1 miles) and Lee (1.5 miles), and the rest of Greater London.