Chelmsford, Essex
Side return extension in Chelmsford
Infilling the narrow passage beside a Victorian or Edwardian back addition. We design, get the approvals for and build side return extensions in Chelmsford and the surrounding area, with one contract from the first survey to building control sign-off.
Chelmsford sits in Essex, with postcode districts including CM1. Side returns suit the Victorian and Edwardian terraces found across parts of Essex, where the kitchen sits in a narrow back addition.
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 side return extension cost in Chelmsford?
For Chelmsford we work from the East of England rate: £2,440–£4,030 per square metre of new floor, including VAT, standard specification. 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 |
|---|---|
| 2 m wide × 6 m deep (12 m²) | £29,500–£48,500 |
| 2.5 m wide × 7 m deep (17.5 m²) | £42,500–£70,500 |
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 side return extension in Chelmsford?
Whether your side return extension in Chelmsford needs a planning application depends on its size, your house and any local restrictions.
Side return infills and the side leg of a wraparound are treated as side extensions in England: single-storey, no more than 4 metres high and no wider than half the original house. They are not permitted development in conservation areas, National Parks or National Landscapes, and a joined wraparound often needs a planning application because the side and rear rules apply together.
The Party Wall etc. Act 1996 applies in England: you serve notice two months before work to a shared wall, and one month before digging foundations within 3 metres (or 6 metres for deeper foundations) of a neighbour's building. Neighbours can agree in writing; if they dissent, surveyors agree an award.
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 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. In Chelmsford we check the boundary line and the neighbour's gutter before drawing a side return, because a few centimetres decide whether the wall goes on or beside the boundary.
How a side return 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.
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.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Side return extensions near Chelmsford
We also build side return extensions in nearby Billericay (7.7 miles) and Witham (8.5 miles).
- Side return extension in Billericay
- Side return extension in Witham
- Side return extension in Maldon
- Side return extension in Wickford
- Side return extension in Braintree
Other work in Chelmsford:
FAQ
Side return extension questions in Chelmsford
Is the site visit in Chelmsford free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do I need planning permission for a rear extension in Chelmsford?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
How much space does a side return add?
Typically 8 to 18 square metres, enough to turn a galley kitchen into a kitchen-diner with an island.
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.
How much does a side return extension cost in Chelmsford?
As a guide, £2,440–£4,030 per square metre including VAT for a standard specification. For example, 2 m wide × 6 m deep (12 m²): about £29,500–£48,500 at that rate. Your written price follows the survey.
What postcode areas do you cover around Chelmsford?
Including CM1, and the surrounding Essex area.