Stranraer, Dumfries and Galloway
Semi-detached rear extension in Stranraer
Single or two-storey extensions for semi-detached houses, with side access and one party wall. If you live in Stranraer and want to know what a semi-detached rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Stranraer and its postcode districts DG9 are part of our Dumfries and Galloway coverage. In Stranraer 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 Stranraer?
Guide prices for a semi-detached rear extension in Stranraer start from our Scotland rate of £1,800–£2,940 per square metre, including VAT. 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 Stranraer?
The planning route for a semi-detached rear extension in Stranraer is set by Scotland's householder rules and your council.
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 Stranraer like to extend?
Post-war semis and terraces are common around Stranraer, and many have room for a single-storey rear extension within Class 1A limits.
How a semi-detached rear extension in Stranraer 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.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Semi-detached rear extensions near Stranraer
Close by, we work in Bangor, about 30.5 miles away, and Larne, about 31.6 miles away.
- Semi-detached rear extension in Bangor
- Semi-detached rear extension in Larne
- Semi-detached rear extension in Carrickfergus
- Semi-detached rear extension in Newtownards
- Semi-detached rear extension in Holywood
Other work in Stranraer:
FAQ
Semi-detached rear extension questions in Stranraer
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.
Do I need planning permission for a rear extension in Stranraer?
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 match pebbledash or render?
Yes. Many semis are refinished with new render across the whole back elevation so old and new match.
Do you handle building control in Stranraer?
Yes. We apply for the building warrant before work starts and submit the completion certificate at the end.
Can you match the brick or stone on my Stranraer house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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.