Extending your home in Dumbarton
Looking to extend your home in Dumbarton? Start here: extension types, guide prices for Dumbarton, the planning rules that apply and how a project runs.
- Postcode districtsG82
- Price regionScotland (×0.98)
- Planning rulesScotland
- Site visitFree, no obligation
Approvals for an extension in Dumbarton
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.
In a conservation area or national scenic area the householder permitted development rights are more limited, listed homes need listed building consent, and if rights have been removed by a condition or direction, any extension needs an application.
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.
Popular extension prices in Dumbarton
We publish guide prices so you can budget before anyone visits. For Dumbarton they are adjusted by ×0.98, the factor we use across Scotland.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Double-storey extensions | 32 m² | £56,000 – £74,000 |
| Conservatory replacement extensions | 14 m² | £29,000 – £38,000 |
| Wraparound extensions | 25 m² | £56,000 – £71,500 |
| Side return extensions | 11 m² | £25,500 – £32,500 |
| Single-storey rear extensions | 20 m² | £40,000 – £51,000 |
| Orangery extensions | 16 m² | £43,500 – £55,000 |
| Extensions over a garage | 12 m² | £24,500 – £32,000 |
Dumbarton and surrounding towns
We cover Dumbarton and the postcode districts G82. Nearby, we also take on projects in Vale of Leven (2 miles), Clydebank (7 miles), Bearsden (9 miles), Bishopbriggs (14 miles), Kirkintilloch (16 miles). For homes towards Renfrewshire and Inverclyde, Erskine is around 6 miles away.
What works best for Dumbarton houses?
Across Scotland, extensions follow Scottish planning and building standards, including the building warrant process, which we build into the programme from the start.
Start by comparing bungalow extensions, orangery extensions and double-storey extensions: between them they cover most of the layouts we see requested for houses like these.
Extension types and starting prices
- Single-storey rear extensions · from £20,500
- Flat roof extensions · from £20,500
- Home office extensions · from £15,500
- Side return extensions · from £17,500
- Extensions over a garage · from £23,500
- Bedroom extensions · from £25,000
- Pitched roof extensions · from £21,500
- Kitchen extensions · from £26,000
- Orangery extensions · from £29,000
- Wraparound extensions · from £35,000
- Annexe extensions · from £53,500
- Bungalow extensions · from £25,500
- Side extensions · from £21,500
- Double-storey extensions · from £37,000
- Glass box extensions · from £29,000
- Timber frame extensions · from £20,500
- Planning permission for extensions · from £300
- Building regulations for extensions · from £850
- Extension plans and drawings · from £1,150
- Utility and boot room extensions · from £13,500
- Porch extensions · from £3,900
- Conservatory replacement extensions · from £19,500
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Dumbarton
How much does an extension cost in Dumbarton?
Using our Scotland factor (×0.98), a standard-spec single-storey extension of 20 m² is a guide £40,000 to £51,000 including VAT, and a 32 m² two-storey extension £56,000 to £74,000. Your written price follows the survey.
Do you cover all of Dumbarton?
Yes, including the surrounding parts of Dunbartonshire. Site visits are free and there is no obligation.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Dumbarton, and the guide-price tool gives a range for your own size and finish in about a minute.
Who do I contract with?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Book a free site visit in Dumbarton
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- 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 free site visit
Tell us a little about the project and we will arrange a time.