Trowbridge, Wiltshire
Two-storey rear extension in Trowbridge
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. If you live in Trowbridge and want to know what a two-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Trowbridge is covered from our Wiltshire round, including BA14. In Trowbridge, a two-storey rear extension is worth comparing with the cost of moving once stamp duty, agents' and legal fees are counted.
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 two-storey rear extension cost in Trowbridge?
In Trowbridge, our guide for a two-storey rear extension is £1,870–£2,810 per square metre including VAT for a standard specification. 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 × 5 m footprint, two floors (30 m²) | £56,000–£84,000 |
| 4 m × 6 m footprint, two floors (48 m²) | £90,000–£135,000 |
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 two-storey rear extension in Trowbridge?
Planning for a two-storey rear extension in Trowbridge follows the English householder rules.
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.
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 Trowbridge like to extend?
Trowbridge has Victorian terraces nearer the centre and post-war semis on the edges. Sloping gardens are frequent, which affects floor levels and steps down to the patio.
How a two-storey rear extension in Trowbridge comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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.
Two-storey rear extensions near Trowbridge
Neighbouring places we cover include Westbury (4.2 miles) and Melksham (4.8 miles).
- Two-storey rear extension in Westbury
- Two-storey rear extension in Melksham
- Two-storey rear extension in Neston
- Two-storey rear extension in Bath
- Two-storey rear extension in Frome
Other work in Trowbridge:
FAQ
Two-storey rear extension questions in Trowbridge
How long does a rear extension take to build in Trowbridge?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Do you handle building control in Trowbridge?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Will we need to move out?
Rarely. The first-floor opening is made late in the job and sealed with temporary screens.
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.
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.
Do I need planning permission for a rear extension in Trowbridge?
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.