Building services in Johnstone
House extensions
- Single-storey extensions
- Double-storey extensions
- Side extensions
- Side return extensions
- Wraparound extensions
- Kitchen extensions
- Orangeries
- Glazed and contemporary extensions
- Porches
Loft conversions
- Dormer loft conversions
- Hip-to-gable loft conversions
- Mansard loft conversions
- Rooflight loft conversions
- Bungalow loft conversions
Garage, basement and barn conversions
New build homes
Renovations and structural work
Design and approvals
Guide prices in Johnstone
| Project | Guide range (inc VAT) |
|---|---|
| Single-storey extensions | £1,900–£2,800 per m² of floor area |
| Double-storey extensions | £1,600–£2,400 per m² of floor area (both floors) |
| Dormer loft conversions | £46,500–£66,000 for a typical rear dormer with en-suite |
| Garage conversions | £17,500–£29,000 for a single integral garage |
| Porches | £6,250–£15,500 from a 3 m² porch to a small front extension |
| Orangeries | £2,350–£3,300 per m² of floor area |
Building costs in Scotland are close to the UK average, so the figures for Johnstone are close to our national guide.
Planning permission in Johnstone
In Scotland a single-storey extension is often permitted development (Class 1A): where any part is within 1 metre of a boundary, it can project up to 3 metres from the rear wall of a terraced house or 4 metres on other houses, with eaves no higher than 3 metres, an overall height of 4 metres and no more than half the front or rear garden covered. The rights do not apply in conservation areas or to flats, and a building warrant will usually still be needed before work starts.
In Scotland a building warrant is needed before work starts on most extensions, loft conversions and conversions. It is issued by the council’s building standards service. When the work is finished, a completion certificate is submitted and accepted by the council after inspection.
About building in Johnstone
Scotland’s housing ranges from sandstone tenements and villas to post-war and modern estates, and the building warrant system shapes how projects are planned.
Johnstone sits in Renfrewshire and Inverclyde, about 3 miles west of Paisley. We cover the whole of Johnstone, including postcodes PA5. Johnstone has a population of around 16,000.
How it works
- 01
Survey and brief
We visit, discuss your ideas and budget, and survey the property or site at no cost.
- 02
Design and pricing
Design options, then a fixed quote based on the chosen drawings and specification.
- 03
Approvals in place
We handle planning, building control and neighbour notices before work starts.
- 04
Construction and completion
We build, put right any snags and hand over the building control certificate.
Questions from homeowners in Johnstone
Do I need planning permission for an extension in Johnstone?
In Scotland a single-storey extension is often permitted development (Class 1A): where any part is within 1 metre of a boundary, it can project up to 3 metres from the rear wall of a terraced house or 4 metres on other houses, with eaves no higher than 3 metres, an overall height of 4 metres and no more than half the front or rear garden covered. The rights do not apply in conservation areas or to flats, and a building warrant will usually still be needed before work starts.
How much does an extension cost in Johnstone?
A single-storey extension in Johnstone typically costs £1,900–£2,800 per m² of floor area, and a double-storey extension £1,600–£2,400 per m² of floor area (both floors), including VAT.
How much does a loft conversion cost in Johnstone?
A rear dormer loft conversion in Johnstone typically costs £46,500–£66,000 for a typical rear dormer with en-suite, including VAT.
Do you work in Johnstone?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Johnstone, including postcodes PA5.
Is the home visit free?
Yes. The first visit to discuss your project and measure up for a quote is free, with no obligation.