Wraparound extensions in Chelmsford
From the first sketch to final sign-off, we plan and build wraparound extensions in Chelmsford and the surrounding Essex area.
- Guide price in ChelmsfordFrom £38,000 inc VAT
- PlanningUsually a householder application
- Build time14–20 weeks on site
- Postcode districtsCM1, CM2
Covering Chelmsford
Postcode districts we cover around Chelmsford include CM1, CM2. We also work in nearby Billericay (8 miles), Witham (9 miles), Maldon (9 miles), Wickford (9 miles).
Bishop's Stortford, in Hertfordshire, is roughly 16 miles from Chelmsford and also on our list. Across the East of England many houses sit on generous plots, and single-storey and wraparound extensions are a natural fit.
Planning rules that apply in Chelmsford
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 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).
What should I budget for a wraparound extension in Chelmsford?
Labour and material costs vary across the UK, so for Chelmsford we use our East of England factor (×1.06). The ranges include VAT and exclude design, structural and council fees.
Typical rates in Chelmsford: £2,120 to £3,920 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| Compact L-shape 18 m² | £38,000 – £46,000 | £43,500 – £55,500 | £55,000 – £71,000 |
| Medium L-shape 25 m² | £53,000 – £64,000 | £60,500 – £77,000 | £76,500 – £98,500 |
| Large L-shape 32 m² | £67,500 – £81,500 | £78,000 – £98,500 | £98,000 – £126,000 |
Try the guide-price tool to see a range for your own size and finish.
Is a wraparound extension right for your house?
- Families who want kitchen, dining and living in one space
- Semi-detached houses with a side passage
- Terraced houses that want the largest ground floor possible
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.
What happens next
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
We visit your Chelmsford home, measure up, talk through what you want and check the planning position.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Common questions in Chelmsford
Do I need building regulations approval in Chelmsford?
Yes. Almost every extension needs it, whatever the planning route. We prepare the drawings and book the inspections.
How long does a wraparound extension take to build in Chelmsford?
On site, typically 14 to 20 weeks once approvals are in place. Before that, allow 8–16 weeks design and approvals.
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Chelmsford, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
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 Chelmsford
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.