Two-storey extensions in Swanage
Everything for a two-storey extension in Swanage, in one place: types, guide prices for South West England, the approval rules in England and how to get started.
Swanage at a glance
- Postcode districts
- BH19
- Area
- Dorset, England
- Price region
- South West England
- Nearest towns
- Poole (7.4 miles), Parkstone (8.4 miles), Bournemouth (8.5 miles), Canford Heath (9.9 miles)
- Distance to Bournemouth
- about 8.5 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 Swanage (BH19) and the places around it, including Poole (7.4 miles), Parkstone (8.4 miles) and Bournemouth.
Extensions available in Swanage
Two-storey rear extensions
Design, approvals and build for Swanage homes. Guide from £57,500.
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Two-storey side extensions
For homes in Swanage: typical guide from £88,500.
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Two-storey wraparound extensions
Design, approvals and build for Swanage homes. Guide from £124,000.
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Part single, part two-storey extensions
Guide from £74,000 in Swanage, including VAT.
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Extensions over a garage
Our South West England guide starts at £32,500 for this type.
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First-floor extensions
For homes in Swanage: typical guide from £26,000.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Swanage homes. Guide from £57,500.
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Two-storey extensions for detached houses
From £88,500 in Swanage. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Our South West England guide starts at £57,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
Guide from £57,500 (plus en-suite) in Swanage, including VAT.
Learn moreWhich type suits your house?
Rear and side extensions suit most semi-detached and detached houses with room around them. Terraced and town-centre homes can take a two-storey extension too, with more care over neighbours, light and access.
Also available in Dorset
- 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 Swanage
Swanage 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 Swanage
Do you cover Swanage?
Yes. We cover Swanage (BH19) and the surrounding area, including Poole and Parkstone. The first site visit is free.
What does a two-storey extension cost in Swanage?
Using our South West 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 £57,500–£78,000 including VAT. An extension over a garage is about £32,500–£47,500.
Which other places near Swanage do you cover?
Everywhere around it, including Poole (7.4 miles), Parkstone (8.4 miles) and Bournemouth (8.5 miles), and the rest of Dorset.