Wiltshire
Rear extension plans and planning applications in Wiltshire
Measured survey, design options, planning drawings and the application, handled for you. Rear extensions in Wiltshire: we cover 14 towns including Swindon, Salisbury and Trowbridge, with design, approvals and the build under one contract.
Planning applications in Swindon go to the local planning authority, and we check its local design guidance for rear extensions before drawing. Stone-built and rendered houses are common around Wiltshire, so matching the walling is a design decision in its own right: natural stone, reconstituted stone or a render finish across old and new.
What does it cost in Wiltshire?
As a guide, £1,000–£2,500 including VAT. These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission in Wiltshire?
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent.
A householder planning application in England costs £548 (£575 for applications made from 8 December 2026), and a lawful development certificate for proposed work costs half the householder fee.
Councils aim to decide householder applications within 8 weeks of validation, and prior approval within 42 days.
Where in Wiltshire do we work?
FAQ
Questions people ask
Do I need an architect?
You need accurate drawings by someone who knows householder planning; we provide them.
Can I see the design in 3D?
Yes; we produce simple 3D views so you can judge the size and light.
What if planning is refused?
We review the reasons with you, amend and resubmit (often free of a second fee within 12 months in England) or appeal.
Do you cover all of Wiltshire?
We cover 14 towns and districts in Wiltshire, including Swindon, Salisbury and Trowbridge.
Who builds the extension?
Vetted building teams working under contract to us; your contract is with S&K Property Investments and Improvement Ltd.