Chelmsford, Essex
Wraparound extension in Chelmsford
An L-shaped extension that fills the side return and runs across the back. We design, get the approvals for and build wraparound extensions in Chelmsford and the surrounding area, with one contract from the first survey to building control sign-off.
Chelmsford and its postcode districts CM1 are part of our Essex coverage. In Chelmsford we usually draw the wraparound and a simpler rear-only option side by side, so the planning risk and cost difference are clear.
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 Chelmsford?
Guide prices for a wraparound extension in Chelmsford start from our East of England rate of £2,330–£3,820 per square metre, including VAT. East of England prices run slightly above our West Midlands baseline; clay soils near trees are the main foundation variable.
| Size | Guide price inc VAT |
|---|---|
| L-shaped, about 22 m² of new floor | £51,500–£84,000 |
| L-shaped, about 30 m² of new floor | £70,000–£114,500 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a wraparound extension in Chelmsford?
Whether your wraparound extension in Chelmsford needs a planning application depends on its size, your house and any local restrictions.
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. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Chelmsford like to extend?
Post-war semis and newer estates are typical of Chelmsford, and many have room for a full-width extension. Shrinkable clay is common in the East of England, so foundations near trees and hedges are designed to NHBC-style depth guidance.
How a wraparound extension in Chelmsford 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Wraparound extensions near Chelmsford
Close by, we work in Billericay, about 7.7 miles away, and Witham, about 8.5 miles away.
- Wraparound extension in Billericay
- Wraparound extension in Witham
- Wraparound extension in Maldon
- Wraparound extension in Wickford
- Wraparound extension in Braintree
Other work in Chelmsford:
FAQ
Wraparound extension questions in Chelmsford
Can you match the brick or stone on my Chelmsford house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.
What roof suits a wraparound?
A flat roof with a lantern, a standing-seam pitched roof or a glazed roof over the side leg. The choice usually follows the first-floor windows above.
Do you handle building control in Chelmsford?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
How much does a wraparound extension cost in Chelmsford?
As a guide, £2,330–£3,820 per square metre including VAT for a standard specification. For example, L-shaped, about 22 m² of new floor: about £51,500–£84,000 at that rate. Your written price follows the survey.