Two-storey extensions in Basingstoke
Everything for a two-storey extension in Basingstoke, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Basingstoke at a glance
- Postcode districts
- RG21, RG22, RG23, RG24 and RG25
- Area
- Hampshire, England
- Price region
- South East England
- Nearest towns
- Tadley (6.3 miles), Alton (9.2 miles), Fleet (11.1 miles), Thatcham (12.3 miles)
- Distance to Southampton
- about 28.3 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.
Around Basingstoke we also work in Tadley, Alton and Fleet, and across the rest of Hampshire. Postcode districts in and near Basingstoke: RG21, RG22, RG23, RG24 and RG25.
Extensions available in Basingstoke
Two-storey rear extensions
Our South East England guide starts at £61,500 for this type.
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Two-storey side extensions
From £94,500 in Basingstoke. Free visit to firm it up.
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Two-storey wraparound extensions
Guide from £132,500 in Basingstoke, including VAT.
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Part single, part two-storey extensions
Basingstoke guide price from £79,000, Standard spec.
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Extensions over a garage
For homes in Basingstoke: typical guide from £34,500.
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First-floor extensions
Basingstoke guide price from £27,500, Standard spec.
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Two-storey extensions for semi-detached houses
Basingstoke guide price from £61,500, Standard spec.
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Two-storey extensions for detached houses
Basingstoke guide price from £94,500, Standard spec.
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Kitchen extensions with bedrooms above
From £61,500 (before kitchen units) in Basingstoke. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Design, approvals and build for Basingstoke homes. Guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Hampshire, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
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 Basingstoke
Basingstoke 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 Basingstoke
Do you cover Basingstoke?
Yes. We cover Basingstoke (RG21, RG22, RG23, RG24 and RG25) and the surrounding area, including Tadley and Alton. The first site visit is free.
What does a two-storey extension cost in Basingstoke?
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 Basingstoke do you cover?
Everywhere around it, including Tadley (6.3 miles), Alton (9.2 miles) and Fleet (11.1 miles), and the rest of Hampshire.