Two-storey extensions in Nailsea
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Nailsea.
Nailsea at a glance
- Postcode districts
- BS48
- Area
- Somerset, England
- Price region
- South West England
- Nearest towns
- Portishead (3.5 miles), Easton-in-Gordano (3.9 miles), Yatton (4.1 miles), Clevedon (4.3 miles)
- Distance to Bath
- about 17.6 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 Nailsea we also work in Portishead, Easton-in-Gordano and Yatton, and across the rest of Somerset. Postcode district in and near Nailsea: BS48.
Extensions available in Nailsea
Two-storey rear extensions
Design, approvals and build for Nailsea homes. Guide from £57,500.
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Two-storey side extensions
Design, approvals and build for Nailsea homes. Guide from £88,500.
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Two-storey wraparound extensions
Guide from £124,000 in Nailsea, including VAT.
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Part single, part two-storey extensions
From £74,000 in Nailsea. Free visit to firm it up.
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Extensions over a garage
For homes in Nailsea: typical guide from £32,500.
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First-floor extensions
Nailsea guide price from £26,000, Standard spec.
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Two-storey extensions for semi-detached houses
Guide from £57,500 in Nailsea, including VAT.
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Two-storey extensions for detached houses
Our South West England guide starts at £88,500 for this type.
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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 Nailsea, including VAT.
Learn moreWhich type suits your house?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in Nailsea, with a rough idea of the approval route and cost for each.
Also available in Somerset
- 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 Nailsea
Nailsea 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 Nailsea
Do you cover Nailsea?
Yes. We cover Nailsea (BS48) and the surrounding area, including Portishead and Easton-in-Gordano. The first site visit is free.
What does a two-storey extension cost in Nailsea?
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 Nailsea do you cover?
Everywhere around it, including Portishead (3.5 miles), Easton-in-Gordano (3.9 miles) and Yatton (4.1 miles), and the rest of Somerset.