Leicestershire and Rutland
Flat-roof rear extensions in Leicestershire and Rutland
Warm flat roofs with lanterns, parapets and long-life membranes. Across Leicestershire and Rutland we handle the whole rear extension: survey, drawings, the planning route, building control and the build. Towns we cover here include Leicester, Loughborough and Hinckley.
Flat roofs are the usual choice for rear extensions because they stay below first-floor windows and take a lantern neatly. Red-brick terraces and semis are typical of Leicestershire and Rutland. Coal-mining legacy areas in parts of the East Midlands can need a Coal Authority check before foundations are designed.
How much does a flat-roof rear extension cost in Leicestershire and Rutland?
Guide prices for a flat-roof rear extension in Leicestershire and Rutland start from our East Midlands rate of £1,840–£3,010 per square metre, including VAT. East Midlands prices sit a little below our West Midlands baseline.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £22,000–£36,000 |
| 4 m wide × 5 m deep (20 m²) | £37,000–£60,000 |
| 4 m wide × 6 m deep (24 m²) | £44,000–£72,000 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission in Leicestershire and Rutland?
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
New fabric must meet Approved Document L (2021 edition incorporating 2023 amendments): walls 0.18, roof 0.15 and floor 0.18 W/m²K, windows 1.4 W/m²K or Band B. Under the simple route, new windows, doors and rooflights should not exceed 25% of the extension floor area plus any openings removed; more glass is possible with a whole-house calculation.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent.
Where in Leicestershire and Rutland do we work?
FAQ
Questions people ask
How long does a flat roof last?
A well-built single-ply or GRP warm roof typically lasts 25 years or more.
Is a flat roof really flat?
No; it is built to falls so water drains to outlets or gutters.
Can I walk on it?
Not as a balcony without planning permission and a guarding design; it can be accessed for maintenance.
Do you cover all of Leicestershire and Rutland?
We cover 23 towns and districts in Leicestershire and Rutland, including Leicester, Loughborough and Hinckley.
Who builds the extension?
Vetted building teams working under contract to us; your contract is with S&K Property Investments and Improvement Ltd.