Portishead wraparound extensions, designed and built
A wraparound extension in Portishead starts with the right design and the right approval route. We take care of both, then build it with our own project management.
- Guide price in PortisheadFrom £36,500 inc VAT
- PlanningUsually a householder application
- Build time14–20 weeks on site
- Postcode districtsBS20
Do I need planning permission in Portishead?
In England a wraparound extension is assessed as both a side and a rear extension, and the combination usually falls outside permitted development, so most need a householder planning application (£548 from 1 April 2026).
Before any drawing is finalised we check whether the house is listed, in a conservation area or subject to an Article 4 direction.
Building over or within 3 m of a public sewer needs the water company's consent, usually through a build-over agreement, before the foundations go in.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
Working in Portishead
Across BS20, we can visit, measure and advise. The same team covers Nailsea (3 miles), Clevedon (5 miles), Keynsham (13 miles), Weston-super-Mare (13 miles), all within easy reach.
Just over the Gloucestershire border, Kingswood is about 11 miles away. In the South West, local stone, render and brick vary from town to town, so matching materials is a big part of designing an extension that looks right.
What should I budget for a wraparound extension in Portishead?
Prices below are for Portishead, using the South West England factor of ×1.02. They are guide ranges including VAT for the build only, not a quote.
Typical rates in Portishead: £2,040 to £3,770 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| Compact L-shape 18 m² | £36,500 – £44,500 | £42,000 – £53,500 | £53,000 – £68,000 |
| Medium L-shape 25 m² | £51,000 – £61,500 | £58,500 – £74,000 | £73,500 – £94,500 |
| Large L-shape 32 m² | £65,000 – £78,500 | £75,000 – £95,000 | £94,500 – £121,000 |
For a figure based on your own dimensions, use our guide-price tool.
What is included
- Foundations, drainage and any manhole relocation
- Roof with glazing along the side return
- Householder planning application
- Structural design for the corner and openings
- Survey, design and 3D layout options
From first visit to completion
Site visits are free and there is no obligation. Where drawings are needed, the design stage is priced in writing before it starts.
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Common questions in Portishead
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Portishead, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
Who do I contract with for a wraparound extension in Portishead?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Do I need building regulations approval in Portishead?
Yes. Almost every extension needs it, whatever the planning route. We prepare the drawings and book the inspections.
Do wraparound extensions need planning permission?
Usually, yes. In England the side element counts as a side extension and the rear element as a rear extension, and the combination normally falls outside permitted development. A householder application costs £548 in England from 1 April 2026.
Is a wraparound better than a side return alone?
It adds far more space, but costs more and needs planning permission more often. Our comparison guide sets the two side by side.
Book a free site visit in Portishead
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.