Wraparound extensions in Bath: design, approvals and build
Bath homeowners can use us for the whole wraparound extension project: survey, design, planning or permitted development checks, building regulations and the build itself.
- Guide price in BathFrom £36,500 inc VAT
- PlanningUsually a householder application
- Build time14–20 weeks on site
- Postcode districtsBA1, BA2
Included in a typical project
- Householder planning application
- Full internal finish or kitchen-ready shell
- Structural design for the corner and openings
- Roof with glazing along the side return
The corner is where wraparounds succeed or fail. We usually use a single steel goalpost or a corner post hidden in a pier, and set the glazing so the new room reads as one space rather than two boxes.
Wraparound extension prices in Bath
Prices below are for Bath, 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 Bath: £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.
Covering Bath
We cover Bath and the postcode districts BA1, BA2. We also work in nearby Keynsham (6 miles), Frome (10 miles), Nailsea (18 miles), Portishead (19 miles).
Trowbridge, in Wiltshire, is roughly 8 miles from Bath and also on our list. South West homes range from terraced streets in the cities to stone cottages and bungalows in the countryside, and conservation areas are common in historic centres.
Will the council need to approve it?
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).
In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
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.
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.
Applications are decided by the local planning authority (your district, borough or unitary council).
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
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Your questions about a wraparound extension in Bath
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Bath, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
How long does a wraparound extension take to build in Bath?
On site, typically 14 to 20 weeks once approvals are in place. Before that, allow 8–16 weeks design and approvals.
Will my neighbours in Bath be involved?
If a planning application or prior approval is needed, the council notifies neighbours. If the work is on or near a shared boundary, party wall notices may also be needed.
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.
Will I need to move a drain?
Often. Side returns frequently contain a manhole or a shared drain. Building near or over a public sewer needs the water company’s consent in England and Wales, which we arrange.
Book a free site visit in Bath
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.