Dumbarton, Glasgow and the Clyde
Wraparound extension in Dumbarton
For homes in Dumbarton, a wraparound extension is often the simplest way to gain space without moving. An L-shaped extension that fills the side return and runs across the back. We take it from survey to completion certificate.
We cover Dumbarton (G82) as part of our Glasgow and the Clyde work. In Dumbarton we usually draw the wraparound and a simpler rear-only option side by side, so the planning risk and cost difference are clear.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a wraparound extension cost in Dumbarton?
A wraparound extension in Dumbarton is priced at £2,090–£3,420 per square metre including VAT as a guide, before kitchen fit-out and fees. Prices in Scotland sit a little below our West Midlands baseline; building warrant fees and drawings are budgeted separately.
| Size | Guide price inc VAT |
|---|---|
| L-shaped, about 22 m² of new floor | £46,000–£75,000 |
| L-shaped, about 30 m² of new floor | £62,500–£102,500 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a wraparound extension in Dumbarton?
The planning route for a wraparound extension in Dumbarton is set by Scotland's householder rules and your council.
Scottish householder rights treat the side part of a wraparound or side infill more strictly than a plain rear extension, so most need planning permission, and all need a building warrant.
There is no Party Wall Act in Scotland; neighbour matters are handled through the title deeds, common law and written agreement before work starts.
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 Dumbarton like to extend?
Post-war semis and terraces are common around Dumbarton, and many have room for a single-storey rear extension within Class 1A limits.
How a wraparound extension in Dumbarton comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
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.
Wraparound extensions near Dumbarton
Neighbouring places we cover include Vale of Leven (1.9 miles) and Port Glasgow (4.6 miles).
- Wraparound extension in Vale of Leven
- Wraparound extension in Port Glasgow
- Wraparound extension in Erskine
- Wraparound extension in Clydebank
- Wraparound extension in Greenock
Other work in Dumbarton:
FAQ
Wraparound extension questions in Dumbarton
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.
Do I need planning permission for a rear extension in Dumbarton?
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.
Can the corner be all glass?
Yes, with a steel or aluminium post or a structural glass corner. It needs careful thermal detailing to meet Building Regulations.
Can you match the brick or stone on my Dumbarton house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
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.