Two-storey extensions in Romsey
Everything for a two-storey extension in Romsey, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Romsey at a glance
- Postcode districts
- SO51 and SO52
- Area
- Hampshire, England
- Price region
- South East England
- Nearest towns
- Totton (4.9 miles), Portswood (6.4 miles), Eastleigh (6.7 miles), Southampton (7.2 miles)
- Distance to Southampton
- about 7.2 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.
Romsey sits about 7.2 miles from Southampton. Closer to home, Totton is 4.9 miles away and Portswood 6.4 miles.
Extensions available in Romsey
Two-storey rear extensions
For homes in Romsey: typical guide from £61,500.
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Two-storey side extensions
For homes in Romsey: typical guide from £94,500.
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Two-storey wraparound extensions
Romsey guide price from £132,500, Standard spec.
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Part single, part two-storey extensions
For homes in Romsey: 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
Design, approvals and build for Romsey homes. Guide from £27,500.
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Two-storey extensions for semi-detached houses
Our South East England guide starts at £61,500 for this type.
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Two-storey extensions for detached houses
Romsey guide price from £94,500, Standard spec.
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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
Guide from £61,500 (plus en-suite) in Romsey, including VAT.
Learn moreWhich type suits your house?
Which type suits your house in Romsey 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 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 Romsey
Romsey 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 Romsey
Do you cover Romsey?
Yes. We cover Romsey (SO51 and SO52) and the surrounding area, including Totton and Portswood. The first site visit is free.
What does a two-storey extension cost in Romsey?
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 Romsey do you cover?
Everywhere around it, including Totton (4.9 miles), Portswood (6.4 miles) and Eastleigh (6.7 miles), and the rest of Hampshire.