Transparent financial decision
Renovation return comparator
Compare net cost, energy savings, future maintenance, service life, potential added value and payback.
Editable assumptions, not return promises.
Preset values only demonstrate the calculation. Replace them with quotes, confirmed incentives, utility bills and estimates tailored to your home.
Inputs
Adjust each scenario
Up to four projects at a time.
Results
Discounted comparison
Add at least one project.
Formula used
- Initial net cost = gross cost minus confirmed incentives.
- Annual benefit = energy savings minus annual maintenance.
- Net present value adds discounted future benefits and added value, then subtracts net cost and replacements expected during the horizon.
- Resale value is never guaranteed; enter zero for a purely energy-based analysis.
Checks before signing
Real measurement
Energy audit, historical consumption, blower-door testing or load calculation depending on the project.
Whole system
Include preparation, accessories, finishes, maintenance, commissioning and future replacement.
Non-financial value
Comfort, moisture, noise, safety, resilience and replacement urgency can outweigh ROI.