Ayrshire house extensions
Looking to extend your home in Ayrshire? Start here: extension types, guide prices for Ayrshire, the planning rules that apply and how a project runs.
- Towns listed7
- Price regionScotland (×0.98)
- Planning rulesScotland
- Postcode districts31

Towns we cover in Ayrshire
Towns we cover here include Kilmarnock, Ayr, Irvine, Kilwinning.
Approvals for an extension in Ayrshire
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.
Guide prices for Ayrshire
We publish guide prices so you can budget before anyone visits. For Ayrshire they are adjusted by ×0.98, the factor we use across Scotland.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £25,500 – £32,500 |
| Extensions over a garage | 12 m² | £24,500 – £32,000 |
| Orangery extensions | 16 m² | £43,500 – £55,000 |
| Wraparound extensions | 25 m² | £56,000 – £71,500 |
| Double-storey extensions | 32 m² | £56,000 – £74,000 |
| Conservatory replacement extensions | 14 m² | £29,000 – £38,000 |
Choosing the right extension in Ayrshire
Scotland's housing includes sandstone villas, terraces and tenements in the cities and plenty of post-war and modern houses and bungalows elsewhere. A building warrant is needed before work starts.
For many houses here, single-storey rear extensions, orangery extensions or bungalow extensions gives the most useful space for the budget.
Choose an extension type
- Annexe extensions · from £53,500
- Extension plans and drawings · from £1,150
- Building regulations for extensions · from £850
- Pitched roof extensions · from £21,500
- Timber frame extensions · from £20,500
- Home office extensions · from £15,500
- Glass box extensions · from £29,000
- Flat roof extensions · from £20,500
- Kitchen extensions · from £26,000
- Porch extensions · from £3,900
- Orangery extensions · from £29,000
- Side return extensions · from £17,500
- Side extensions · from £21,500
- Conservatory replacement extensions · from £19,500
- Double-storey extensions · from £37,000
- Single-storey rear extensions · from £20,500
- Extensions over a garage · from £23,500
- Utility and boot room extensions · from £13,500
- Bungalow extensions · from £25,500
- Wraparound extensions · from £35,000
- Planning permission for extensions · from £300
- Bedroom extensions · from £25,000
Neighbouring areas
Questions about extensions in Ayrshire
How much does an extension cost in Ayrshire?
With our Scotland factor (×0.98), a standard-spec 20 m² single-storey extension is a guide £40,000 to £51,000 including VAT. Prices for every type are linked on this page.
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.
Do you cover all of Ayrshire?
Yes, across the whole of Ayrshire. Site visits are free and there is no obligation.
Will my neighbours need to be told?
If you apply for planning permission the council notifies neighbours, and we agree access with them in writing for work near a shared boundary.
Book a free site visit in Ayrshire
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.