Alloa, Forth Valley
Single-storey rear extension in Alloa
Single-storey rear extension in Alloa: ground-floor space across the back of the house, usually for a kitchen, dining or family room. We measure the house, show you what the rules allow, price it in writing and build it.
Alloa is covered from our Forth Valley round, including FK10. A depth of 3 to 4 metres keeps many single-storey rear extensions in Alloa within permitted development, subject to the house's planning history.
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 Alloa?
In Alloa, our guide for a single-storey rear extension is £1,800–£2,940 per square metre including VAT for a 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 |
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 single-storey rear extension in Alloa?
Planning for a single-storey rear extension in Alloa follows the Scottish householder rules.
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. At the first visit we measure what is there now and tell you which route fits: permitted development or a planning application, plus the building warrant.
What are homes in Alloa like to extend?
Post-war semis and terraces are common around Alloa, and many have room for a single-storey rear extension within Class 1A limits.
How a single-storey rear extension in Alloa 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Paperwork handled
Planning or permitted development, the building warrant, structural design and neighbour agreements 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.
Single-storey rear extensions near Alloa
Close by, we work in Stirling, about 5.7 miles away, and Stenhousemuir, about 6.2 miles away.
- Single-storey rear extension in Stirling
- Single-storey rear extension in Stenhousemuir
- Single-storey rear extension in Grangemouth
- Single-storey rear extension in Falkirk
- Single-storey rear extension in Bo'ness
Other work in Alloa:
FAQ
Single-storey rear extension questions in Alloa
Do I need a party wall agreement?
Scotland has no Party Wall Act; we agree access and protection with your neighbour in writing instead.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
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.
Do I need planning permission for a rear extension in Alloa?
Many single-storey rear extensions are permitted development under Class 1A, but not in conservation areas; you always need a building warrant before work starts.
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.
Is the site visit in Alloa free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.