Kilwinning, Ayrshire
Single-storey rear extension in Kilwinning
We plan and build single-storey rear extensions for homeowners in Kilwinning. Ground-floor space across the back of the house, usually for a kitchen, dining or family room. Start with a free site visit, then a written price once the design is agreed.
Kilwinning is covered from our Ayrshire round, including KA13. A depth of 3 to 4 metres keeps many single-storey rear extensions in Kilwinning within permitted development, subject to the house's planning history.
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 single-storey rear extension cost in Kilwinning?
In Kilwinning, our guide for a single-storey rear extension is £1,800–£2,940 per square metre including VAT for a 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a single-storey rear extension in Kilwinning?
Planning for a single-storey rear extension in Kilwinning follows the Scottish householder rules.
Scottish householder permitted development (Class 1A) covers many single-storey rear extensions, with a 3 metre eaves limit, a 4 metre height limit and, within 1 metre of a boundary, a depth limit of 3 metres for terraced houses or 4 metres for others. Conservation areas are excluded, and you need a building warrant whatever the planning position.
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. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Kilwinning like to extend?
Post-war semis and terraces are common around Kilwinning, and many have room for a single-storey rear extension within Class 1A limits.
How a single-storey rear extension in Kilwinning 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Paperwork handled
Planning or permitted development, the building warrant, structural design and neighbour agreements are all handled by us.
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.
Single-storey rear extensions near Kilwinning
From Kilwinning, the nearest places we also cover are Irvine (3.1 miles) and Saltcoats (3.3 miles).
- Single-storey rear extension in Irvine
- Single-storey rear extension in Saltcoats
- Single-storey rear extension in Ardrossan
- Single-storey rear extension in Troon
- Single-storey rear extension in Kilmarnock
Other work in Kilwinning:
FAQ
Single-storey rear extension questions in Kilwinning
How much does a single-storey rear extension cost in Kilwinning?
As a guide, £1,800–£2,940 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £21,500–£35,500 at that rate. Your written price follows the survey.
What postcode areas do you cover around Kilwinning?
Including KA13, and the surrounding Ayrshire area.
Does it add value to the house?
Nationwide's October 2025 house price research found that a 10% increase in floor area is linked to about 5% higher value on average. It is a guide, not a promise; local agents can tell you what extended homes on your street sell for.
Do you handle building control in Kilwinning?
Yes. We apply for the building warrant before work starts and submit the completion certificate at the end.
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.
How long does a rear extension take to build in Kilwinning?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.