Cheshire
Rear extensions for detached houses in Cheshire
Wider, deeper rear extensions with room for vaulted roofs and big glazing. Rear extensions in Cheshire: we cover 21 towns including Warrington, Chester and Crewe, with design, approvals and the build under one contract.
Detached houses in Cheshire often have room for a deeper rear extension under England's prior approval route or a full-width design. Stone and brick terraces are common around Cheshire. Where houses back onto a ginnel or alley, deliveries can come in from the rear, which makes the build tidier.
How much does a detached house rear extension cost in Cheshire?
Guide prices for a detached house rear extension in Cheshire start from our North West England rate of £1,830–£3,010 per square metre, including VAT. North West prices sit below our West Midlands baseline; access on terraced streets is the main variable.
| Size | Guide price inc VAT |
|---|---|
| 4 m wide × 6 m deep (24 m²) | £44,000–£72,000 |
| 5 m wide × 8 m deep (40 m²) | £73,500–£120,500 |
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 in Cheshire?
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.
England's rules allow a rear extension of more than one storey without an application only when it is no deeper than 3 metres and at least 7 metres from the boundary opposite the rear wall, and never on designated land. Most two-storey schemes need householder planning permission.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent.
Where in Cheshire do we work?
FAQ
Questions people ask
How deep can I extend a detached house?
4 metres under permitted development in England, or 8 metres with prior approval, outside designated land.
Can I have a vaulted ceiling?
Yes, with a pitched roof and exposed or boxed rafters, subject to the height limits.
Is an oak frame worth it?
It is a premium finish with a long life; it costs more than blockwork with a plain roof.
Do you cover all of Cheshire?
We cover 21 towns and districts in Cheshire, including Warrington, Chester and Crewe.
Who builds the extension?
Vetted building teams working under contract to us; your contract is with S&K Property Investments and Improvement Ltd.