March, Cambridgeshire
Single-storey rear extension in March
Ground-floor space across the back of the house, usually for a kitchen, dining or family room. If you live in March and want to know what a single-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
We cover March (PE15) as part of our Cambridgeshire work. A depth of 3 to 4 metres keeps many single-storey rear extensions in March within permitted development, subject to the house's planning history.
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 single-storey rear extension cost in March?
Guide prices for a single-storey rear extension in March start from our East of England rate of £2,010–£3,290 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 |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £24,000–£39,500 |
| 4 m wide × 5 m deep (20 m²) | £40,500–£65,500 |
| 4 m wide × 6 m deep (24 m²) | £48,500–£79,000 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a single-storey rear extension in March?
The planning route for a single-storey rear extension in March is set by England's householder rules and your council.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres within 2 metres of a boundary.
If 3 or 4 metres is not enough, England's prior approval route allows 6 metres on a terraced or semi-detached house and 8 metres on a detached house for a single-storey rear extension. Neighbours are consulted, the council decides within 42 days, and the fee is £249, rising to £310 from 8 December 2026.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in March like to extend?
March mixes Victorian terraces with 1930s semis, so both side returns and full-width kitchen extensions suit houses here.
How a single-storey rear extension in March 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.
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.
Single-storey rear extensions near March
We also build single-storey rear extensions in nearby Chatteris (6.7 miles) and Primrose Place (8.3 miles).
- Single-storey rear extension in Chatteris
- Single-storey rear extension in Primrose Place
- Single-storey rear extension in Wisbech
- Single-storey rear extension in Whittlesey
- Single-storey rear extension in Ely
Other work in March:
FAQ
Single-storey rear extension questions in March
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.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
Will the extension make the room behind it dark?
Not if it is designed well. Rooflights or a lantern over the old back room, and a wide opening into it, keep daylight reaching the middle of the house.
What postcode areas do you cover around March?
Including PE15, and the surrounding Cambridgeshire area.
Do you handle building control in March?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in March free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.