St Helier, Greater London
Wraparound extension in St Helier
We plan and build wraparound extensions for homeowners in St Helier. An L-shaped extension that fills the side return and runs across the back. Start with a free site visit, then a written price once the design is agreed.
St Helier is covered from our Greater London round, including SM1, SM4 and SM5. Wraparounds are the natural next step for the end-of-terrace and Victorian houses in Greater London where a side return alone would leave the room too narrow.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a wraparound extension cost in St Helier?
In St Helier, our guide for a wraparound extension is £2,860–£4,680 per square metre including VAT for a standard specification. London prices sit at the top of our range because of labour rates, access through the house, parking suspensions and skip licences.
| Size | Guide price inc VAT |
|---|---|
| L-shaped, about 22 m² of new floor | £63,000–£103,000 |
| L-shaped, about 30 m² of new floor | £86,000–£140,500 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a wraparound extension in St Helier?
Planning for a wraparound extension in St Helier follows the English householder rules.
In England the side part of a side return or wraparound must meet the side-extension rules (one storey, under 4 metres high, no more than half the width of the original house), and those rights do not apply on designated land. Because a wraparound combines a side and a rear extension, many need householder planning permission.
Because rear extensions often sit on or near the boundary, the Party Wall etc. Act 1996 usually applies in England. Notices go out one or two months before work depending on the type of work, and a surveyor's award is only needed if a neighbour does not consent.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in St Helier like to extend?
Much of St Helier is 1920s and 1930s semis and short terraces with longer gardens than inner London, which suit full-width single-storey rear extensions. Parking suspensions, skip licences and controlled hours on residential streets shape the programme more than the build itself.
How a wraparound extension in St Helier comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Wraparound extensions near St Helier
From St Helier, the nearest places we also cover are Carshalton (1.2 miles) and Morden (1.3 miles).
- Wraparound extension in Carshalton
- Wraparound extension in Morden
- Wraparound extension in Mitcham
- Wraparound extension in Wallington
- Wraparound extension in Cheam
Other work in St Helier:
FAQ
Wraparound extension questions in St Helier
Can you match the brick or stone on my St Helier house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
What postcode areas do you cover around St Helier?
Including SM1, SM4 and SM5, and the surrounding Greater London area.
Can the corner be all glass?
Yes, with a steel or aluminium post or a structural glass corner. It needs careful thermal detailing to meet Building Regulations.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Do you handle building control in St Helier?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in St Helier free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.