Two-storey extensions in Alton
We design, get approval for and build two-storey extensions in Alton and the surrounding area. Choose the type of extension below or book a free site visit.
Alton at a glance
- Postcode districts
- GU34
- Area
- Hampshire, England
- Price region
- South East England
- Nearest towns
- Bordon (5.5 miles), Farnham (8.8 miles), Basingstoke (9.2 miles), Hale (Surrey) (9.8 miles)
- Distance to Southampton
- about 25.2 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.
We cover Alton (GU34) and the places around it, including Bordon (5.5 miles), Farnham (8.8 miles) and Basingstoke.
Extensions available in Alton
Two-storey rear extensions
Design, approvals and build for Alton homes. Guide from £61,500.
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Two-storey side extensions
Guide from £94,500 in Alton, including VAT.
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Two-storey wraparound extensions
Our South East England guide starts at £132,500 for this type.
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Part single, part two-storey extensions
From £79,000 in Alton. Free visit to firm it up.
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Extensions over a garage
Design, approvals and build for Alton homes. Guide from £34,500.
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First-floor extensions
Our South East England guide starts at £27,500 for this type.
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Two-storey extensions for semi-detached houses
Alton guide price from £61,500, Standard spec.
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Two-storey extensions for detached houses
Guide from £94,500 in Alton, including VAT.
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Kitchen extensions with bedrooms above
Guide from £61,500 (before kitchen units) in Alton, including VAT.
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Extra bedroom and en-suite extensions
Guide from £61,500 (plus en-suite) in Alton, including VAT.
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Alton we also design annexes, home offices and bedrooms over garages.
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 Alton
Alton 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 Alton
Do you cover Alton?
Yes. We cover Alton (GU34) and the surrounding area, including Bordon and Farnham. The first site visit is free.
What does a two-storey extension cost in Alton?
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 Alton do you cover?
Everywhere around it, including Bordon (5.5 miles), Farnham (8.8 miles) and Basingstoke (9.2 miles), and the rest of Hampshire.