Two-storey extensions in Knightsbridge and Belgravia
We design, get approval for and build two-storey extensions in Knightsbridge and Belgravia and the surrounding area. Choose the type of extension below or book a free site visit.
Knightsbridge and Belgravia at a glance
- Postcode districts
- SW7
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Bayswater (0.9 miles), Chelsea (1.2 miles), St James's (1.2 miles), Westminster (1.4 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 Knightsbridge and Belgravia (SW7) and the places around it, including Bayswater (0.9 miles), Chelsea (1.2 miles) and St James's.
Extensions available in Knightsbridge and Belgravia
Two-storey rear extensions
For homes in Knightsbridge and Belgravia: typical guide from £67,000.
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Two-storey side extensions
From £103,500 in Knightsbridge and Belgravia. Free visit to firm it up.
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Two-storey wraparound extensions
For homes in Knightsbridge and Belgravia: typical guide from £144,500.
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Part single, part two-storey extensions
Knightsbridge and Belgravia guide price from £86,500, Standard spec.
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Extensions over a garage
From £38,000 in Knightsbridge and Belgravia. Free visit to firm it up.
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First-floor extensions
Design, approvals and build for Knightsbridge and Belgravia homes. Guide from £30,000.
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Two-storey extensions for semi-detached houses
For homes in Knightsbridge and Belgravia: typical guide from £67,000.
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Two-storey extensions for detached houses
Our London guide starts at £103,500 for this type.
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Kitchen extensions with bedrooms above
From £67,000 (before kitchen units) in Knightsbridge and Belgravia. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Guide from £67,000 (plus en-suite) in Knightsbridge and Belgravia, including VAT.
Learn moreWhich type suits your house?
Which type suits your house in Knightsbridge and Belgravia depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
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 Knightsbridge and Belgravia
Knightsbridge and Belgravia 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 Knightsbridge and Belgravia
Do you cover Knightsbridge and Belgravia?
Yes. We cover Knightsbridge and Belgravia (SW7) and the surrounding area, including Bayswater and Chelsea. The first site visit is free.
What does a two-storey extension cost in Knightsbridge and Belgravia?
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 Knightsbridge and Belgravia do you cover?
Everywhere around it, including Bayswater (0.9 miles), Chelsea (1.2 miles) and St James's (1.2 miles), and the rest of Greater London.