Cumbernauld, Lanarkshire
Semi-detached rear extension in Cumbernauld
We plan and build rear extensions for semi-detached houses for homeowners in Cumbernauld. Single or two-storey extensions for semi-detached houses, with side access and one party wall. Start with a free site visit, then a written price once the design is agreed.
Cumbernauld is covered from our Lanarkshire round, including G67. In Cumbernauld we measure the attached neighbour's extension at the survey, because it often sets the sensible depth for yours.
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 semi-detached rear extension cost in Cumbernauld?
For Cumbernauld we work from the Scotland rate: £1,800–£2,940 per square metre of new floor, including VAT, 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 |
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 semi-detached rear extension in Cumbernauld?
Planning for a semi-detached rear extension in Cumbernauld follows the Scottish householder rules.
In Scotland a single-storey rear extension can be permitted development under Class 1A: eaves no higher than 3 metres and an overall height of 4 metres, and where any part is within 1 metre of a boundary it can project no more than 3 metres on a terraced house or 4 metres on other houses. The rights do not apply in conservation areas, and a building warrant is still needed before work starts.
In Scotland an extension of more than one storey is only permitted development (Class 1B) if no part is within 10 metres of any boundary and it is no higher than the existing house, so almost every two-storey rear extension needs planning permission and a building warrant.
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. At the first visit we measure what is there now and tell you which route fits: permitted development or a planning application, plus the building warrant.
What are homes in Cumbernauld like to extend?
Post-war semis and terraces are common around Cumbernauld, and many have room for a single-storey rear extension within Class 1A limits.
How a semi-detached rear extension in Cumbernauld comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning or permitted development, the building warrant, structural design and neighbour agreements are all handled by us.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the accepted completion certificate.
Semi-detached rear extensions near Cumbernauld
We also build rear extensions for semi-detached houses in nearby Airdrie (5.6 miles) and Coatbridge (6.0 miles).
- Semi-detached rear extension in Airdrie
- Semi-detached rear extension in Coatbridge
- Semi-detached rear extension in Kirkintilloch
- Semi-detached rear extension in Viewpark
- Semi-detached rear extension in Stenhousemuir
Other work in Cumbernauld:
FAQ
Semi-detached rear extension questions in Cumbernauld
Is the site visit in Cumbernauld free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do you handle building control in Cumbernauld?
Yes. We apply for the building warrant before work starts and submit the completion certificate at the end.
How long does a semi extension take?
10 to 16 weeks on site for a single-storey extension.
Do I need planning permission for a rear extension in Cumbernauld?
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 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.
What postcode areas do you cover around Cumbernauld?
Including G67, and the surrounding Lanarkshire area.