Two-storey extensions in Mortlake
Homeowners in Mortlake can use us for the whole project or just the drawings and approvals. Start with a free visit.
Mortlake at a glance
- Postcode districts
- SW14
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- East Sheen (0.5 miles), Barnes (0.9 miles), Kew (1.2 miles), Roehampton (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.
We cover Mortlake (SW14) and the places around it, including East Sheen (0.5 miles), Barnes (0.9 miles) and Kew.
Extensions available in Mortlake
Two-storey rear extensions
Guide from £67,000 in Mortlake, including VAT.
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Two-storey side extensions
Design, approvals and build for Mortlake homes. Guide from £103,500.
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Two-storey wraparound extensions
Guide from £144,500 in Mortlake, including VAT.
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Part single, part two-storey extensions
For homes in Mortlake: typical guide from £86,500.
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Extensions over a garage
Design, approvals and build for Mortlake homes. Guide from £38,000.
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First-floor extensions
For homes in Mortlake: typical guide from £30,000.
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Two-storey extensions for semi-detached houses
Guide from £67,000 in Mortlake, including VAT.
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Two-storey extensions for detached houses
Mortlake guide price from £103,500, Standard spec.
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Kitchen extensions with bedrooms above
From £67,000 (before kitchen units) in Mortlake. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Design, approvals and build for Mortlake homes. Guide from £67,000 (plus en-suite).
Learn moreWhich type suits your house?
Which type suits your house in Mortlake 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 Mortlake
Mortlake 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 Mortlake
Do you cover Mortlake?
Yes. We cover Mortlake (SW14) and the surrounding area, including East Sheen and Barnes. The first site visit is free.
What does a two-storey extension cost in Mortlake?
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 Mortlake do you cover?
Everywhere around it, including East Sheen (0.5 miles), Barnes (0.9 miles) and Kew (1.2 miles), and the rest of Greater London.