Chaddesden, Derbyshire
Semi-detached rear extension in Chaddesden
Single or two-storey extensions for semi-detached houses, with side access and one party wall. If you live in Chaddesden and want to know what a semi-detached rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Chaddesden and its postcode districts DE1, DE21 and DE22 are part of our Derbyshire coverage. Semi-detached houses are common across Derbyshire, and their side access makes rear extensions quicker to build.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a semi-detached rear extension cost in Chaddesden?
For Chaddesden we work from the East Midlands rate: £1,840–£3,010 per square metre of new floor, including VAT, standard specification. 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a semi-detached rear extension in Chaddesden?
The planning route for a semi-detached rear extension in Chaddesden is set by England's householder rules and your council.
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.
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.
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. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Chaddesden like to extend?
Red-brick terraces and semis are typical of Chaddesden. Coal-mining legacy areas in parts of the East Midlands can need a Coal Authority check before foundations are designed.
How a semi-detached rear extension in Chaddesden comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Semi-detached rear extensions near Chaddesden
We also build rear extensions for semi-detached houses in nearby Oakwood (1.0 miles) and Derby (1.8 miles).
- Semi-detached rear extension in Oakwood
- Semi-detached rear extension in Derby
- Semi-detached rear extension in Sinfin
- Semi-detached rear extension in Ilkeston
- Semi-detached rear extension in Heanor
Other work in Chaddesden:
FAQ
Semi-detached rear extension questions in Chaddesden
Do I need planning permission for a rear extension in Chaddesden?
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.
Do you handle building control in Chaddesden?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
What if my neighbour has already extended?
That can make a matching depth easier to justify. We measure theirs at the survey.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Is the site visit in Chaddesden free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
What postcode areas do you cover around Chaddesden?
Including DE1, DE21 and DE22, and the surrounding Derbyshire area.