Global Energy Renovation
Installing solar panels on a poorly insulated roof is ecological nonsense. How to combine insulation and photovoltaics in a single large project?
Prerequisite tool required
CECB Plus
Renovation bonus
Cantonal Aid (Bonus)
Ideal pooling
Shared scaffolding
Tax profitability
Deductions over 2 years
The CECB approach to a successful Swiss renovation.
Remember the essentials of this issue at a glance before moving on to the detailed analysis and recommendation.
Objective
Decide quickly
Horizon
2026
Approach
Practical decision
Verifications
5
Problem Analysis
Putting a Ferrari engine in a body with holes: this is the image of installing solar on a property whose CECB (Cantonal Energy Certificate) is rated F or G. The heat loss from the roof is immense, and solar will mask this defect without perpetuating the building.
The challenge of a Global Energy Renovation is to synchronize three major professions (Insulation / Heating / Solar). In Switzerland, the framework is a sensitive place. Insulation from the outside of the roof (Sarking) makes it possible to modernize thermal insulation without losing living space.
Our Recommendation
Proceed with the CECB Plus Audit before requesting a Solar quote.
It is the essential compass. The cantonal expert will precisely list the renovation variants and calculate the subsidy envelopes. By combining the repair of the roof (insulation) and the installation of PV (integrated in-roof or standard installed) at the same time, you pool the immense fixed costs of scaffolding, craning and authorizations.
In addition, almost all cantons (Vaud, Geneva, Fribourg, Valais) via the Building Program apply powerful financial bonuses (sometimes 30% additional aid) in the event of a joint rehabilitation project.
Sources & Method
Analysis based on ElCom 2024–2026 data, OFEN (Federal Office of Energy), Pronovo SA, EPFL and HEG Geneva studies. The financial projections use the following assumptions unless otherwise stated: local purchase price, GRD injection price, production 1 100 kWh/kWp/year, self-consumption rate 35–40%. Actual results vary depending on canton, roof orientation and consumption profile. The site may also present its own services or calls for contact related to these subjects.
Next step
Compare several quotes, validate profitability with our tools and then check the contractual conditions adapted to your canton.
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