Heat load surveys and system design in Johnstone
For self-builds and extensions in Johnstone, a standalone design pack can go straight to your builder. Mild Scottish summers mean cooling matters most in conservatories, lofts and rooms with large windows.
Every Johnstone quote starts with a room-by-room survey rather than a guess from floor area. We cover Johnstone as part of Renfrewshire and Inverclyde, roughly 3 miles from Paisley. Homes in PA5 are all within our coverage.
Prices in Johnstone
Guide prices around Johnstone run from £365 to £1,145 for a standalone design pack including VAT. Labour rates in Central and Southern Scotland keep this slightly under the national middle. Larger homes, more zones and full drawing sets for a builder are what move a design pack towards the upper figure. On our Central and Southern Scotland figures, the Design pack option (drawings and schedules for one home) is about £365–£745.
Home survey
Free with an installation quote.
Design pack
Drawings and schedules for one home.
Self-build pack
Whole-house design for a new build.
Planning and permissions
In Scotland, planning conditions for outdoor units depend on the property type and location; conservation areas and listed buildings need particular care.
The survey
On a survey in Johnstone the engineer looks at room size, glazing, the route for pipes and drains, the electrics and where the outdoor unit can sit quietly, then the written quote follows. The free survey is where the real price is set: room measurements, pipe and drain routes, electrical checks and the outdoor unit position, all written into your quote.
What is included
Included as standard in Johnstone:
- Pipe and drain routes
- Written proposal with options
- Electrical load for your electrician
- Equipment selection and outdoor unit sizing
- Noise check to the nearest neighbour
Nearby
Nearby, we also cover Paisley (3 miles), Barrhead (5 miles) and Erskine (6 miles). See all services in Johnstone or heat load surveys and system design across Renfrewshire and Inverclyde.

