Derbyshire
Rear extensions in Derby
Rear extensions in Derby: single-storey and two-storey extensions, side returns, wraparounds and glass-led designs, planned around red-brick terraces and semis and the English rules.
Derby is in Derbyshire, with postcode districts including DE1, DE3, DE21, DE22 and DE23. The nearest places we also cover are Chaddesden (1.8 miles) and Oakwood (2.4 miles).
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Tell us about the house and we'll call to arrange a free, no-obligation visit.
Rear extensions we build in Derby
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
- Rear extensions for bungalows
- Rear extension plans and planning applications
Also available across Derbyshire:
- Rear extensions for detached houses
- Flat-roof rear extensions
- Pitched and lean-to roof rear extensions
- Knocking through to a rear extension
- Roof lanterns and rooflights for rear extensions
- Permitted development rear extensions
- Larger home extension prior approval (England)
- Building Regulations for rear extensions
Rear extension prices in Derby
East Midlands prices sit a little below our West Midlands baseline.
| Example | Guide inc VAT |
|---|---|
| Single-storey, 3 m × 4 m (12 m²) | £22,000–£36,000 |
| Single-storey, 4 m × 6 m (24 m²) | £44,000–£72,000 |
| Two-storey, 3 m × 5 m footprint (30 m²) | £52,500–£78,500 |
| Side return, about 14 m² | £31,000–£51,500 |
| Wraparound, about 25 m² | £53,500–£87,500 |
What are homes in Derby like to extend?
Red-brick terraces and semis are typical of Derby. Coal-mining legacy areas in parts of the East Midlands can need a Coal Authority check before foundations are designed.
Planning rules for Derby
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.
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.
Planning and Building Regulations are separate in England: even a permitted development extension is inspected for foundations, drainage, structure, insulation, fire safety and ventilation, through the council or a registered building control approver, ending with a completion certificate.
Nearby towns
FAQ
Questions people ask
How much is a rear extension in Derby?
A 3 m × 4 m single-storey rear extension is about £22,000–£36,000 including VAT at our East Midlands guide rates; the written price follows a survey.
Do I need planning permission in Derby?
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.
Is the site visit in Derby free?
Yes, with no obligation.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.