Part single, part two-storey extensions in Thurso
For a part single, part two-storey extension in Thurso, the first questions are always the same: how big, which approvals, and what it will cost. This page answers all three for the Highlands, Moray and Islands.
We take on projects in Thurso by arrangement. Site visits here aren't free as standard, and we'll agree travel costs with you in writing first.
What we'd confirm first for a project in Thurso.
- Postcode districts
- KW12 and KW14
- County / area
- The Highlands, Moray and Islands, Scotland
- Price region
- Scotland
- Guide price
- £67,500–£93,000 (£1,880–£2,580 per m²)
- Approval route
- Planning permission is usually needed: Class 1B permitted development only applies if every part of the extension is at least 10 m from all boundaries. A building warrant is needed before work starts.
- Nearest towns
- Wick (18.9 miles), Tain (57.3 miles), Lossiemouth (60.9 miles)
- Distance to Inverness
- about 81.1 miles
- First visit
- By arrangement
About a part single, part two-storey extension
A part single, part two-storey extension suits you if you want a generous ground floor but only need one extra room upstairs, or if a full two-storey design would affect a neighbour too much. You get design options that test where the two-storey part works best, the approvals your nation needs, structural design, a building warrant and the build, carried out by vetted teams working under S&K.
Thurso sits about 81.1 miles from Inverness. Closer to home, Wick is 18.9 miles away and Tain 57.3 miles.
What it costs in Thurso
A guide price for Thurso: around £67,500–£93,000 for a 6 m × 4 m ground floor and a first floor over half of it (36 m² in total). That works out at £1,880–£2,580 per m² of new floor space, including VAT at 20%. Design fees, structural calculations and approval fees are separate and listed on our prices page.
| Spec | Per m² | A 6 m × 4 m ground floor and a first floor over half of it (36 m² in total) |
|---|---|---|
| Essential | £1,730–£2,380 per m² | £62,500–£85,500 |
| Standard | £1,880–£2,580 per m² | £67,500–£93,000 |
| Premium | £2,260–£3,100 per m² | £81,000–£111,500 |
Planning and building standards in Thurso
In Scotland, because part of the extension is more than one storey, it is assessed under Class 1B, which needs at least 10 m to every boundary for permitted development. On most plots that is not possible, so the extension needs a householder application (£371, decided within two months). A building warrant is also needed before any work starts.
Approval in Scotland: Householder planning application: £371. Councils have two months to decide a local planning application.
Building standards: A building warrant from the council's building standards service before work starts, and a completion certificate at the end. Scotland uses its own Technical Handbooks.
Design points for Thurso homes
The roof junction
Where the single-storey roof meets the two-storey wall you need a sound weathering detail, usually a lead or similar flashing, and enough height for roof lights or a lantern. We set the roof falls and the upstairs window sill heights together so they do not clash.
Where to put the two-storey part
The two-storey section usually works best away from the closest neighbour, with the single-storey part on that boundary side. We test a few positions against neighbours' windows, the upstairs layout and the roof shape before choosing the one to take forward.
How we'd run your project
Visit by arrangement
We agree a visit to your home in Thurso and any travel costs with you in writing first, then look at the structure, access and boundaries.
Plans, then approval
Measured survey, design, then the right approval route for your house. We explain each step before we take it.
Engineer it
Foundations sized for two floors, steels for any openings, and a building warrant, all before anyone starts on site.
Build and hand over
We manage the build from groundworks to decoration-ready finish and hand over with the completion paperwork.
Questions about part single, part two-storey extensions in Thurso
Do I need planning permission for a part single, part two-storey extension in Thurso?
Thurso is in Scotland. Planning permission is usually needed: Class 1B permitted development only applies if every part of the extension is at least 10 m from all boundaries. A building warrant is needed before work starts.
Which postcodes do you cover around Thurso?
We cover Thurso (KW12 and KW14) and nearby places including Wick, Tain and Lossiemouth, plus the rest of the Highlands, Moray and Islands. Visits and projects in Thurso are by arrangement, with travel costs agreed in writing first.
Who handles building standards for a project in Thurso?
We handle it as part of the project. What's needed in Scotland: a building warrant from the council's building standards service before work starts, and a completion certificate at the end. Scotland uses its own Technical Handbooks. We prepare the drawings and the engineer's calculations, book the inspections and pass you the completion paperwork at the end.
Which side should the two-storey part go on?
Usually the side furthest from the nearest neighbour's windows, so the single-storey part sits nearest them and keeps their light. Other factors are where the stairs land upstairs, which room needs the extra space and where drains run. We sketch options at the design stage and explain which is most likely to be approved.
Can the single-storey part be deeper than the two-storey part?
With planning permission, yes, and that is often the point of the design: the ground floor projects further into the garden while the first floor stays back from neighbours. Under permitted development, the depth limits for extensions of more than one storey can apply to the whole extension, so we confirm which route applies before drawings are finalised.
Nearby
Nearby towns we cover for part single, part two-storey extensions:
Other extensions in Thurso
- Rear
- Side
- Wraparound
- Over a garage
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Thurso · Part single, part two-storey extensions across the Highlands, Moray and Islands
The quickest next step is a visit. We'll look at your house in Thurso and give you an honest view of the options.