Extensions in Derbyshire: design, planning and build
From a small utility to a two-storey addition, we take on house extensions throughout Derbyshire, starting with a free visit and a planning check.
- Towns listed12
- Price regionEast Midlands (×0.95)
- Planning rulesEngland
- Postcode districts34
Towns we cover in Derbyshire
Towns we cover here include Derby, Chesterfield, Long Eaton, Ilkeston.
What works best for Derbyshire houses?
Homes across the East Midlands often have usable side land or a driveway beside the house, which opens up side and wraparound options.
For many houses here, single-storey rear extensions, side extensions or conservatory replacement extensions gives the most useful space for the budget.
Popular extension prices in Derbyshire
Every figure below is a guide for Derbyshire, adjusted for East Midlands build costs (×0.95) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Wraparound extensions | 25 m² | £54,500 – £69,000 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
| Single-storey rear extensions | 20 m² | £38,500 – £49,500 |
| Kitchen extensions | 20 m² | £39,500 – £50,500 |
| Side return extensions | 11 m² | £25,000 – £31,500 |
| Double-storey extensions | 32 m² | £54,500 – £71,500 |
Approvals for an extension in Derbyshire
In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.
In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Choose an extension type
- Double-storey extensions · from £36,000
- Bungalow extensions · from £24,500
- Kitchen extensions · from £25,500
- Planning permission for extensions · from £300
- Bedroom extensions · from £24,500
- Extension plans and drawings · from £1,100
- Porch extensions · from £3,800
- Pitched roof extensions · from £21,000
- Glass box extensions · from £28,500
- Home office extensions · from £15,000
- Annexe extensions · from £52,000
- Extensions over a garage · from £22,500
- Conservatory replacement extensions · from £19,000
- Timber frame extensions · from £19,500
- Wraparound extensions · from £34,000
- Building regulations for extensions · from £850
- Side extensions · from £20,500
- Orangery extensions · from £28,500
- Utility and boot room extensions · from £13,000
- Side return extensions · from £17,000
- Single-storey rear extensions · from £19,500
- Flat roof extensions · from £19,500
Neighbouring areas
Questions about extensions in Derbyshire
How much does an extension cost in Derbyshire?
With our East Midlands factor (×0.95), a standard-spec 20 m² single-storey extension is a guide £38,500 to £49,500 including VAT. Prices for every type are linked on this page.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Who do I contract with?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Book a free site visit in Derbyshire
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.