Greater Manchester
Rear extensions for semi-detached houses in Greater Manchester
Single or two-storey extensions for semi-detached houses, with side access and one party wall. We design and build rear extensions across Greater Manchester, from Manchester and Oldham to Wigan, covering single-storey kitchen extensions, two-storey additions, side returns and wraparounds.
Semi-detached houses are common across Greater Manchester, and their side access makes rear extensions quicker to build. Greater Manchester has long runs of terraced houses with back yards and alleys, plus 1930s semis further out. Yard extensions on terraces are often single-storey and close to both boundaries.
How much does a semi-detached rear extension cost in Greater Manchester?
In Greater Manchester, our guide for a semi-detached rear extension is £1,790–£2,910 per square metre including VAT for a standard specification. North West prices sit below our West Midlands baseline; access on terraced streets is the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £21,500–£35,000 |
| 4 m wide × 5 m deep (20 m²) | £35,500–£58,500 |
| 4 m wide × 6 m deep (24 m²) | £43,000–£70,000 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission in Greater Manchester?
In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part is within 2 metres of a boundary.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent.
Where in Greater Manchester do we work?
- Manchester
- Oldham
- Wigan
- Bolton
- Stockport
- Salford
- Rochdale
- Sale
- Bury
- Altrincham
- Middleton
- Ashton-under-Lyne
- Leigh
- Stretford
- Urmston
- Chadderton
- Eccles
- Tyldesley
- Hyde
- Walkden
- Prestwich
- Radcliffe
- Cheadle Hulme
- Heywood
- Denton
- Stalybridge
- Ashton in Makerfield
- Westhoughton
- Farnworth
- Saddleworth
- Hindley
- Golborne
- Droylsden
- Whitefield
- Swinton
- Royton
- Atherton
- Old Trafford
- Dukinfield
- Failsworth
- Hazel Grove
- Irlam
- Horwich
- Manchester City Centre
- Bramhall
- Ramsbottom
- Bredbury
- Hale
- Longsight
- Didsbury
- Fallowfield
- Littleborough
- Burnage
- Little Hulton
- Marple
- Cheetham Hill
- Lees
- Hollinwood
- Crumpsall
- Timperley
- Uppermill
- Ince-in-Makerfield
- Blackley
- Kearsley
- Little Lever
- Abram
FAQ
Questions people ask
How far can I extend a semi without planning?
3 metres under permitted development in England, or up to 6 metres with prior approval, outside designated land.
Can I match pebbledash or render?
Yes. Many semis are refinished with new render across the whole back elevation so old and new match.
Single or two-storey on a semi?
Two-storey if you need bedrooms, single-storey if you need a bigger kitchen. Planning risk is lower for single-storey.
Do you cover all of Greater Manchester?
We cover 66 towns and districts in Greater Manchester, including Manchester, Oldham and Wigan.
Who builds the extension?
Vetted building teams working under contract to us; your contract is with S&K Property Investments and Improvement Ltd.