Home extensions in Johnstone
Every type of house extension in Johnstone, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsPA5, PA10
- Price regionScotland (×0.98)
- Planning rulesScotland
- Site visitFree, no obligation
Do extensions in Johnstone need planning permission?
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.
Applications are decided by your council as planning authority.
Popular extension prices in Johnstone
We publish guide prices so you can budget before anyone visits. For Johnstone they are adjusted by ×0.98, the factor we use across Scotland.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £43,500 – £55,000 |
| Conservatory replacement extensions | 14 m² | £29,000 – £38,000 |
| Double-storey extensions | 32 m² | £56,000 – £74,000 |
| Wraparound extensions | 25 m² | £56,000 – £71,500 |
| Side return extensions | 11 m² | £25,500 – £32,500 |
| Extensions over a garage | 12 m² | £24,500 – £32,000 |
| Single-storey rear extensions | 20 m² | £40,000 – £51,000 |
Johnstone and surrounding towns
Postcode districts we cover around Johnstone include PA5, PA10. We also work in nearby Paisley (3 miles), Barrhead (5 miles), Erskine (6 miles), Renfrew (6 miles), Newton Mearns (8 miles). Just over the Dunbartonshire border, Clydebank is about 7 miles away.
Which extension suits a Johnstone home?
Across Scotland, extensions follow Scottish planning and building standards, including the building warrant process, which we build into the programme from the start.
Start by comparing single-storey rear extensions, bungalow extensions and double-storey extensions: between them they cover most of the layouts we see requested for houses like these.
Extension types and starting prices
- Annexe extensions · from £53,500
- Double-storey extensions · from £37,000
- Timber frame extensions · from £20,500
- Glass box extensions · from £29,000
- Bedroom extensions · from £25,000
- Bungalow extensions · from £25,500
- Extension plans and drawings · from £1,150
- Pitched roof extensions · from £21,500
- Flat roof extensions · from £20,500
- Side return extensions · from £17,500
- Side extensions · from £21,500
- Planning permission for extensions · from £300
- Kitchen extensions · from £26,000
- Wraparound extensions · from £35,000
- Orangery extensions · from £29,000
- Conservatory replacement extensions · from £19,500
- Extensions over a garage · from £23,500
- Porch extensions · from £3,900
- Home office extensions · from £15,500
- Building regulations for extensions · from £850
- Single-storey rear extensions · from £20,500
- Utility and boot room extensions · from £13,500
Free site visit
We visit your Johnstone home, measure up, talk through what you want and check the planning position.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Johnstone
How much does an extension cost in Johnstone?
Using our Scotland factor (×0.98), a standard-spec single-storey extension of 20 m² is a guide £40,000 to £51,000 including VAT, and a 32 m² two-storey extension £56,000 to £74,000. Your written price follows the survey.
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.
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Johnstone, and the guide-price tool gives a range for your own size and finish in about a minute.
Do I need planning permission for an extension in Johnstone?
Not always. It depends on the size, position and your property's history. Scottish householder rules allow some smaller extensions without an application, but a building warrant is still needed.
Book a free site visit in Johnstone
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.