Two-storey extensions in Southampton
Everything for a two-storey extension in Southampton, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Southampton at a glance
- Postcode districts
- SO14 and SO15
- Area
- Hampshire, England
- Price region
- South East England
- Nearest towns
- Woolston (1.4 miles), Portswood (1.7 miles), Hythe (Hampshire) (3 miles), Totton (3.9 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 Southampton (SO14 and SO15) and the places around it, including Woolston (1.4 miles), Portswood (1.7 miles) and Hythe (Hampshire).
Extensions available in Southampton
Two-storey rear extensions
Guide from £61,500 in Southampton, including VAT.
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Two-storey side extensions
From £94,500 in Southampton. Free visit to firm it up.
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Two-storey wraparound extensions
Guide from £132,500 in Southampton, including VAT.
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Part single, part two-storey extensions
For homes in Southampton: typical guide from £79,000.
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Extensions over a garage
Our South East England guide starts at £34,500 for this type.
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First-floor extensions
From £27,500 in Southampton. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
From £61,500 in Southampton. Free visit to firm it up.
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Two-storey extensions for detached houses
From £94,500 in Southampton. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Our South East England guide starts at £61,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
Southampton guide price from £61,500 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in Southampton, with a rough idea of the approval route and cost for each.
Also available in Hampshire
- 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 Southampton
Southampton 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 Southampton
Do you cover Southampton?
Yes. We cover Southampton (SO14 and SO15) and the surrounding area, including Woolston and Portswood. The first site visit is free.
What does a two-storey extension cost in Southampton?
Using our South East England 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 £61,500–£83,000 including VAT. An extension over a garage is about £34,500–£50,500.
Which other places near Southampton do you cover?
Everywhere around it, including Woolston (1.4 miles), Portswood (1.7 miles) and Hythe (Hampshire) (3 miles), and the rest of Hampshire.