Rosyth, Fife
Single-storey rear extension in Rosyth
We plan and build single-storey rear extensions for homeowners in Rosyth. Ground-floor space across the back of the house, usually for a kitchen, dining or family room. Start with a free site visit, then a written price once the design is agreed.
We cover Rosyth (KY11 and KY12) as part of our Fife work. A single-storey rear extension in Rosyth is mostly built from the garden side, so the house stays usable for most of the job.
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 single-storey rear extension cost in Rosyth?
For Rosyth we work from the Scotland rate: £1,800–£2,940 per square metre of new floor, including VAT, standard specification. Prices in Scotland sit a little below our West Midlands baseline; building warrant fees and drawings are budgeted separately.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £21,500–£35,500 |
| 4 m wide × 5 m deep (20 m²) | £36,000–£59,000 |
| 4 m wide × 6 m deep (24 m²) | £43,500–£70,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a single-storey rear extension in Rosyth?
Here is how the rules in Scotland apply to a single-storey rear extension in Rosyth.
Scottish householder permitted development (Class 1A) covers many single-storey rear extensions, with a 3 metre eaves limit, a 4 metre height limit and, within 1 metre of a boundary, a depth limit of 3 metres for terraced houses or 4 metres for others. Conservation areas are excluded, and you need a building warrant whatever the planning position.
Scotland has no larger-extension prior approval route; extensions beyond permitted development need a planning application.
Classes 1A and 1B do not apply in conservation areas, and listed buildings need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Rosyth like to extend?
Post-war semis and terraces are common around Rosyth, and many have room for a single-storey rear extension within Class 1A limits.
How a single-storey rear extension in Rosyth 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.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for the building warrant.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the accepted completion certificate and any guarantees from suppliers.
Single-storey rear extensions near Rosyth
We also build single-storey rear extensions in nearby Dunfermline (2.5 miles) and Cowdenbeath (6.3 miles).
- Single-storey rear extension in Dunfermline
- Single-storey rear extension in Cowdenbeath
- Single-storey rear extension in Bo'ness
- Single-storey rear extension in Broxburn
- Single-storey rear extension in Linlithgow
Other work in Rosyth:
FAQ
Single-storey rear extension questions in Rosyth
What postcode areas do you cover around Rosyth?
Including KY11 and KY12, and the surrounding Fife area.
How long does a rear extension take to build in Rosyth?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Does it add value to the house?
Nationwide's October 2025 house price research found that a 10% increase in floor area is linked to about 5% higher value on average. It is a guide, not a promise; local agents can tell you what extended homes on your street sell for.
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 much does a single-storey rear extension cost in Rosyth?
As a guide, £1,800–£2,940 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £21,500–£35,500 at that rate. Your written price follows the survey.
Is the site visit in Rosyth free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.