Two-storey extensions in Grangemouth
Planning a bigger home in Grangemouth? Compare extension types and guide prices below, then book a free site visit.
Grangemouth at a glance
- Postcode districts
- FK3
- Area
- Falkirk, Stirling and Clackmannanshire, Scotland
- Price region
- Scotland
- Nearest towns
- Falkirk (2.5 miles), Stenhousemuir (3.7 miles), Bo’ness (4.1 miles), Larbert (4.2 miles)
- Distance to Stirling
- about 11.1 miles
- Approvals
- Class 1B: two-storey extensions must be at least 10 m from every boundary to avoid planning permission, so most need an application.
Around Grangemouth we also work in Falkirk, Stenhousemuir and Bo’ness, and across the rest of Falkirk, Stirling and Clackmannanshire. Postcode district in and near Grangemouth: FK3.
Extensions available in Grangemouth

Two-storey rear extensions
From £52,500 in Grangemouth. Free visit to firm it up.
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Two-storey side extensions
From £81,000 in Grangemouth. Free visit to firm it up.
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Two-storey wraparound extensions
Grangemouth guide price from £113,000, Standard spec.
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Part single, part two-storey extensions
Grangemouth guide price from £67,500, Standard spec.
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Extensions over a garage
Design, approvals and build for Grangemouth homes. Guide from £29,500.
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First-floor extensions
Design, approvals and build for Grangemouth homes. Guide from £23,500.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Grangemouth homes. Guide from £52,500.
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Two-storey extensions for detached houses
For homes in Grangemouth: typical guide from £81,000.
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Kitchen extensions with bedrooms above
Guide from £52,500 (before kitchen units) in Grangemouth, including VAT.
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Extra bedroom and en-suite extensions
From £52,500 (plus en-suite) in Grangemouth. Free visit to firm it up.
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Grangemouth we also design annexes, home offices and bedrooms over garages.
Also available in Falkirk, Stirling and Clackmannanshire
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Design and build two-storey extensions
Rules for Grangemouth
Grangemouth is in Scotland. Class 1B: two-storey extensions must be at least 10 m from every boundary to avoid planning permission, so most need an application. Householder planning application: £371. Councils have two months to decide a local planning application.
The full Scotland rules explained
Questions about extensions in Grangemouth
Do you cover Grangemouth?
Yes. We cover Grangemouth (FK3) and the surrounding area, including Falkirk and Stenhousemuir. The first site visit is free.
What does a two-storey extension cost in Grangemouth?
Using our Scotland guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £52,500–£71,000 including VAT. An extension over a garage is about £29,500–£43,000.
Which other places near Grangemouth do you cover?
Everywhere around it, including Falkirk (2.5 miles), Stenhousemuir (3.7 miles) and Bo’ness (4.1 miles), and the rest of Falkirk, Stirling and Clackmannanshire.