Two-storey extensions in Blackheath
We design, get approval for and build two-storey extensions in Blackheath and the surrounding area. Choose the type of extension below or book a free site visit.
Blackheath at a glance
- Postcode districts
- SE3
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Lee (0.6 miles), Kidbrooke (0.8 miles), Greenwich (1.2 miles), Ladywell (1.5 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 SE3 in and around Blackheath, along with neighbouring Lee, Kidbrooke and Greenwich.
Extensions available in Blackheath
Two-storey rear extensions
From £67,000 in Blackheath. Free visit to firm it up.
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Two-storey side extensions
For homes in Blackheath: typical guide from £103,500.
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Two-storey wraparound extensions
Design, approvals and build for Blackheath homes. Guide from £144,500.
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Part single, part two-storey extensions
Guide from £86,500 in Blackheath, including VAT.
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Extensions over a garage
Guide from £38,000 in Blackheath, including VAT.
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First-floor extensions
For homes in Blackheath: typical guide from £30,000.
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Two-storey extensions for semi-detached houses
For homes in Blackheath: typical guide from £67,000.
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Two-storey extensions for detached houses
Blackheath guide price from £103,500, Standard spec.
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Kitchen extensions with bedrooms above
Guide from £67,000 (before kitchen units) in Blackheath, including VAT.
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Extra bedroom and en-suite extensions
Design, approvals and build for Blackheath homes. Guide from £67,000 (plus en-suite).
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Blackheath we measure distances to every boundary before suggesting a type.
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 Blackheath
Blackheath 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 Blackheath
Do you cover Blackheath?
Yes. We cover Blackheath (SE3) and the surrounding area, including Lee and Kidbrooke. The first site visit is free.
What does a two-storey extension cost in Blackheath?
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 Blackheath do you cover?
Everywhere around it, including Lee (0.6 miles), Kidbrooke (0.8 miles) and Greenwich (1.2 miles), and the rest of Greater London.