Fort William, Highlands and Islands
Semi-detached rear extension in Fort William
Semi-detached rear extension in Fort William: single or two-storey extensions for semi-detached houses, with side access and one party wall. We measure the house, show you what the rules allow, price it in writing and build it.
Fort William and its postcode districts PH33 are part of our Highlands and Islands coverage. Semi-detached houses are common across the Highlands and Islands, and their side access makes rear extensions quicker to build.
Ask about a site visit
Visits here are by arrangement; we'll confirm before booking.
Fort William is outside our regular coverage, so visits and projects here are by arrangement: we confirm whether we can take the job, and agree any travel costs, before the first visit.
How much does a semi-detached rear extension cost in Fort William?
In Fort William, our guide for a semi-detached 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a semi-detached rear extension in Fort William?
Here is how the rules in Scotland apply to a semi-detached rear extension in Fort William.
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.
Scottish Class 1B rights for extensions of more than one storey need a 10 metre gap to every boundary, which few gardens have. Expect a planning application as well as a building warrant for a double-storey rear extension.
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. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Fort William like to extend?
Traditional stone houses sit alongside modern bungalows and timber-frame homes around Fort William. A lighter, contrasting addition at the back often suits older stone houses better than trying to copy the walling.
How a semi-detached rear extension in Fort William comes together
Survey visit
We measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Approvals
Permitted development check or planning application, then building warrant drawings and structural calculations, plus a written agreement with neighbours for any shared-wall work.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the accepted completion certificate and any guarantees from suppliers.
Semi-detached rear extensions near Fort William
From Fort William, the nearest places we also cover are Inverness (56.6 miles) and Crieff (57.3 miles).
- Semi-detached rear extension in Inverness
- Semi-detached rear extension in Crieff
- Semi-detached rear extension in Helensburgh
- Semi-detached rear extension in Gourock
- Semi-detached rear extension in Greenock
Other work in Fort William:
FAQ
Semi-detached rear extension questions in Fort William
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
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.
How long does a semi extension take?
10 to 16 weeks on site for a single-storey extension.
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.
Do I need planning permission for a rear extension in Fort William?
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.
Do you handle building control in Fort William?
Yes. We apply for the building warrant before work starts and submit the completion certificate at the end.