Calculate your project now
Open the interactive estimator, select this project and adjust the country, size and finish level.
Open the free calculator →How the calculation works
Compare the installed cost after incentives with a cautious estimate of annual energy savings for the climate and building type.
Realistic example
A 60 m² loft at 30 per m² costs about 1,800 before grants or incentives.
Common mistakes
- Blocking ventilation
- Compressing insulation
- Assuming identical savings everywhere
Regional price differences
Labour availability, transport, taxes, product standards, climate and local building requirements can materially change the result. Use the country selector for a broad comparison, then verify current prices with local suppliers and at least two suitably qualified professionals.
When professional advice is necessary
Seek qualified advice where the work affects structure, electricity, gas, plumbing, drainage, fire safety, waterproofing, asbestos, planning permission or building approval.