Single-storey rear extensions across Argyll and Bute
A single-storey extension in Argyll and Bute starts with the right design and the right approval route. We take care of both, then build it with our own project management.
- Guide priceFrom £20,500 inc VAT
- PlanningScottish householder rules; building warrant needed
- Towns covered3
- Site visitFree on the mainland; islands by arrangement
Towns in Argyll and Bute
Planning rules that apply in Argyll and Bute
In Scotland, householder permitted development rules (Class 1A for single-storey ground-floor extensions and Class 1B for extensions of more than one storey) allow some smaller extensions without a planning application, within limits on depth, height and distance from the boundary. Conservation areas and listed buildings are more restricted.
Before any drawing is finalised we check whether the house is listed, in a conservation area or subject to an Article 4 direction.
Building close to a public sewer needs the agreement of Scottish Water, which we check during design.
In Scotland a building warrant from the council is needed before work starts on almost any extension, and a completion certificate is issued when the work is accepted. Building standards are set in the Scottish technical handbooks.
Applications are decided by your council as planning authority.
Included in a typical project
- Flat or pitched roof, rooflights or lantern
- Foundations, drainage and groundworks
- Walls, steel beams and the new opening into the house
- Planning route checked and the right approval obtained
- Building regulations drawings and structural calculations
Extensions in and around Argyll and Bute
Towns we cover in Argyll and Bute include Oban, Dunoon, Helensburgh. Across Scotland, extensions follow Scottish planning and building standards, including the building warrant process, which we build into the programme from the start.
What should I budget for a single-storey extension in Argyll and Bute?
For Argyll and Bute we adjust our national guide rates by ×0.98, the factor we use for Scotland. Figures include VAT; your written quote after the survey replaces them.
Typical rates in Argyll and Bute: £1,720 to £3,330 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| 3 m × 4 m 12 m² | £20,500 – £24,500 | £24,000 – £31,000 | £30,500 – £40,000 |
| 4 m × 5 m 20 m² | £34,000 – £40,500 | £40,000 – £51,000 | £50,500 – £67,000 |
| 5 m × 6 m 30 m² | £51,000 – £60,500 | £60,000 – £76,500 | £76,000 – £100,000 |
Want a range for your exact size? The guide-price tool takes about a minute.
How the project works
Free site visits on the mainland; island and remote addresses by arrangement, with travel costs agreed first.
Site visit
We visit your Argyll and Bute home, measure up, talk through what you want and check the planning position.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Your questions about a single-storey extension in Argyll and Bute
Will my neighbours in Argyll and Bute be involved?
If a planning application is needed, the council notifies neighbours. Where work is close to a shared boundary, we agree access and protection with them in writing.
Do you cover all of Argyll and Bute?
Yes, across the whole of Argyll and Bute. Free site visits on the mainland; island and remote addresses by arrangement, with travel costs agreed first.
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Argyll and Bute, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
Can I stay in the house during the build?
Usually yes. Most of the work happens outside until the final weeks, when we open the rear wall. We plan that stage carefully and seal the opening with a temporary screen to keep dust down.
Will I need a steel beam?
Almost always. Opening up the rear wall to join the new room to the house needs a beam, usually steel, sized by a structural engineer. It is included in our quotes.
Book a site visit in Argyll and Bute
We will measure up, check the planning position and give you honest guide figures.
- Free site visits on the mainland; islands and remote addresses by arrangement
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a site visit
Tell us a little about the project and we will arrange a time.