Two-storey extensions in Rothesay
Everything for a two-storey extension in Rothesay, in one place: types, guide prices for Scotland, the approval rules in Scotland and how to get started.
Rothesay is outside our usual mainland visit area, so visits and projects here are by arrangement. We'll agree any travel costs with you before anything is booked.
Rothesay at a glance
- Postcode districts
- PA20 and PA21
- Area
- Argyll and Bute, Scotland
- Price region
- Scotland
- Nearest towns
- Largs (8 miles), Dunoon (9.3 miles), Gourock (12.6 miles), Greenock (13.8 miles)
- Distance to Helensburgh
- about 17.3 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 Rothesay we also work in Largs, Dunoon and Gourock, and across the rest of Argyll and Bute. Postcode districts in and near Rothesay: PA20 and PA21.
Extensions available in Rothesay

Two-storey rear extensions
Our Scotland guide starts at £52,500 for this type.
Learn more
Two-storey side extensions
Rothesay guide price from £81,000, Standard spec.
Learn more
Two-storey wraparound extensions
Our Scotland guide starts at £113,000 for this type.
Learn more
Part single, part two-storey extensions
Our Scotland guide starts at £67,500 for this type.
Learn more
Extensions over a garage
Design, approvals and build for Rothesay homes. Guide from £29,500.
Learn more
First-floor extensions
Design, approvals and build for Rothesay homes. Guide from £23,500.
Learn more
Two-storey extensions for semi-detached houses
For homes in Rothesay: typical guide from £52,500.
Learn more
Two-storey extensions for detached houses
For homes in Rothesay: typical guide from £81,000.
Learn more
Kitchen extensions with bedrooms above
Design, approvals and build for Rothesay homes. Guide from £52,500 (before kitchen units).
Learn more
Extra bedroom and en-suite extensions
For homes in Rothesay: typical guide from £52,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Argyll and Bute, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
Also available in Argyll and Bute
- 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 Rothesay
Rothesay 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 Rothesay
Do you cover Rothesay?
Yes. We cover Rothesay (PA20 and PA21) and the surrounding area, including Largs and Dunoon. Visits here are by arrangement.
What does a two-storey extension cost in Rothesay?
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 Rothesay do you cover?
Everywhere around it, including Largs (8 miles), Dunoon (9.3 miles) and Gourock (12.6 miles), and the rest of Argyll and Bute.