Two-storey extensions in St Leonards-on-Sea
We design, get approval for and build two-storey extensions in St Leonards-on-Sea and the surrounding area. Choose the type of extension below or book a free site visit.
St Leonards-on-Sea at a glance
- Postcode districts
- TN32, TN37 and TN38
- Area
- East Sussex, England
- Price region
- South East England
- Nearest towns
- Hastings (1.5 miles), Bexhill-on-Sea (3.3 miles), Hailsham (12.5 miles), Eastbourne (12.9 miles)
- Distance to Brighton
- about 29.9 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.
St Leonards-on-Sea sits about 29.9 miles from Brighton. Closer to home, Hastings is 1.5 miles away and Bexhill-on-Sea 3.3 miles.
Extensions available in St Leonards-on-Sea
Two-storey rear extensions
For homes in St Leonards-on-Sea: typical guide from £61,500.
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Two-storey side extensions
Guide from £94,500 in St Leonards-on-Sea, including VAT.
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Two-storey wraparound extensions
From £132,500 in St Leonards-on-Sea. Free visit to firm it up.
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Part single, part two-storey extensions
For homes in St Leonards-on-Sea: typical guide from £79,000.
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Extensions over a garage
From £34,500 in St Leonards-on-Sea. Free visit to firm it up.
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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
Our South East England guide starts at £61,500 for this type.
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Two-storey extensions for detached houses
Our South East England guide starts at £94,500 for this type.
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Kitchen extensions with bedrooms above
For homes in St Leonards-on-Sea: typical guide from £61,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Guide from £61,500 (plus en-suite) in St Leonards-on-Sea, including VAT.
Learn moreWhich type suits your house?
Which type suits your house in St Leonards-on-Sea 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 East Sussex
- 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 St Leonards-on-Sea
St Leonards-on-Sea 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 St Leonards-on-Sea
Do you cover St Leonards-on-Sea?
Yes. We cover St Leonards-on-Sea (TN32, TN37 and TN38) and the surrounding area, including Hastings and Bexhill-on-Sea. The first site visit is free.
What does a two-storey extension cost in St Leonards-on-Sea?
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 St Leonards-on-Sea do you cover?
Everywhere around it, including Hastings (1.5 miles), Bexhill-on-Sea (3.3 miles) and Hailsham (12.5 miles), and the rest of East Sussex.