Calne, Wiltshire
Terraced house rear extension in Calne
Rear and side return extensions for terraces, with access through the house and two neighbours. If you live in Calne and want to know what a terraced house rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Calne is covered from our Wiltshire round, including SN11. On a Calne terrace both neighbours usually need party wall notices or agreement, so we talk to them early.
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 terraced house rear extension cost in Calne?
Guide prices for a terraced house rear extension in Calne start from our South West England rate of £2,130–£3,430 per square metre, including VAT. South West prices run slightly above our West Midlands baseline; natural stone to match the house is the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4.5 m deep (13.5 m²) | £29,000–£46,500 |
| 3 m wide × 6 m deep (18 m²) | £38,500–£62,000 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a terraced house rear extension in Calne?
Whether your terraced house rear extension in Calne needs a planning application depends on its size, your house and any local restrictions.
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.
Because rear extensions often sit on or near the boundary, the Party Wall etc. Act 1996 usually applies in England. Notices go out one or two months before work depending on the type of work, and a surveyor's award is only needed if a neighbour does not consent.
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 Calne like to extend?
Stone-built and rendered houses are common around Calne, so matching the walling is a design decision in its own right: natural stone, reconstituted stone or a render finish across old and new.
How a terraced house rear extension in Calne comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Terraced house rear extensions near Calne
Neighbouring places we cover include Chippenham (5.3 miles) and Devizes (6.1 miles).
- Terraced house rear extension in Chippenham
- Terraced house rear extension in Devizes
- Terraced house rear extension in Melksham
- Terraced house rear extension in Corsham
- Terraced house rear extension in Royal Wootton Bassett
Other work in Calne:
FAQ
Terraced house rear extension questions in Calne
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
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.
How deep can I go on a terrace?
3 metres under permitted development in England, or up to 6 metres with prior approval outside designated land.
Do you handle building control in Calne?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
How much does a terraced house rear extension cost in Calne?
As a guide, £2,130–£3,430 per square metre including VAT for a standard specification. For example, 3 m wide × 4.5 m deep (13.5 m²): about £29,000–£46,500 at that rate. Your written price follows the survey.