Two-storey extensions in Portishead
Need more room in Portishead? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Portishead at a glance
- Postcode districts
- BS20
- Area
- Somerset, England
- Price region
- South West England
- Nearest towns
- Easton-in-Gordano (3 miles), Nailsea (3.5 miles), Clevedon (4.7 miles), Yatton (6.9 miles)
- Distance to Bath
- about 19.1 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 postcode district BS20 in and around Portishead, along with neighbouring Easton-in-Gordano, Nailsea and Clevedon.
Extensions available in Portishead
Two-storey rear extensions
For homes in Portishead: typical guide from £57,500.
Learn more
Two-storey side extensions
Guide from £88,500 in Portishead, including VAT.
Learn more
Two-storey wraparound extensions
Design, approvals and build for Portishead homes. Guide from £124,000.
Learn more
Part single, part two-storey extensions
From £74,000 in Portishead. Free visit to firm it up.
Learn more
Extensions over a garage
Design, approvals and build for Portishead homes. Guide from £32,500.
Learn more
First-floor extensions
Design, approvals and build for Portishead homes. Guide from £26,000.
Learn more
Two-storey extensions for semi-detached houses
Our South West England guide starts at £57,500 for this type.
Learn more
Two-storey extensions for detached houses
From £88,500 in Portishead. Free visit to firm it up.
Learn more
Kitchen extensions with bedrooms above
From £57,500 (before kitchen units) in Portishead. Free visit to firm it up.
Learn more
Extra bedroom and en-suite extensions
Guide from £57,500 (plus en-suite) in Portishead, 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 Portishead, 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 Portishead
Portishead 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 Portishead
Do you cover Portishead?
Yes. We cover Portishead (BS20) and the surrounding area, including Easton-in-Gordano and Nailsea. The first site visit is free.
What does a two-storey extension cost in Portishead?
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 Portishead do you cover?
Everywhere around it, including Easton-in-Gordano (3 miles), Nailsea (3.5 miles) and Clevedon (4.7 miles), and the rest of Somerset.