Part single, part two-storey extensions in Fort William
If you live in Fort William and need more room without moving, a part single, part two-storey extension is worth a serious look. We handle the drawings, approvals, structure and build.
We take on projects in Fort William by arrangement. Site visits here aren't free as standard, and we'll agree travel costs with you in writing first.
Quick reference for homeowners in Fort William.
- Postcode districts
- PH33, PH49 and PH50
- 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
- Caol (1.5 miles), Oban (30.9 miles), Pitlochry (52.7 miles)
- Distance to Inverness
- about 56.6 miles
- First visit
- By arrangement
About a part single, part two-storey extension
A part single, part two-storey extension is an extension where the ground floor is wider or deeper than the floor above, so only part of it rises to two storeys. It usually gives a large kitchen or living area with roof lights below and one bedroom or bathroom above. It is often a good way to add space while limiting the effect on neighbours.
Fort William sits about 56.6 miles from Inverness. Closer to home, Caol is 1.5 miles away and Oban 30.9 miles.
What it costs in Fort William
For budgeting in Fort William, allow around £67,500–£93,000 for a part single, part two-storey extension with a 6 m × 4 m ground floor and a first floor over half of it (36 m² in total). That's based on £1,880–£2,580 per m² including VAT for Scotland. We'll give you a written design-stage price first, then a fixed build price once the drawings are agreed.
| 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 Fort William
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 Fort William homes
Structure at the step
The first-floor wall above often sits over the new open-plan space, so it needs a steel beam or frame to carry it. Loads come down at different points than in a full two-storey design, and the engineer sizes the foundations to suit each part.
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.
How we'd run your project
Visit by arrangement
We agree a visit to your home in Fort William and any travel costs with you in writing first, then look at the structure, access and boundaries.
Design and approvals
We draw the extension and check it against the rules for Scotland, then apply for planning permission or a certificate of lawfulness, whichever fits.
Price it properly
Once the engineer's calculations are in, we fix the build price in writing, with a clear list of what's included.
On site
One project lead runs the job, keeps you updated and arranges inspections at each stage until completion.
Questions about part single, part two-storey extensions in Fort William
Do I need planning permission for a part single, part two-storey extension in Fort William?
Fort William 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.
How much does a part single, part two-storey extension cost in Fort William?
Our guide for Scotland, which covers Fort William, is £1,880–£2,580 per m² including VAT. A typical project with a 6 m × 4 m ground floor and a first floor over half of it (36 m² in total) comes to about £67,500–£93,000. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Which postcodes do you cover around Fort William?
We cover Fort William (PH33, PH49 and PH50) and nearby places including Caol, Oban and Pitlochry, plus the rest of the Highlands, Moray and Islands. Visits and projects in Fort William are by arrangement, with travel costs agreed in writing first.
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
We also cover places near Fort William, including:
Other extensions in Fort William
- Rear
- Side
- Wraparound
- Over a garage
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Fort William · 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 Fort William and give you an honest view of the options.