1. Distinguish federal and cantonal requirements
In March 2026, the Federal Council restated the requirement for solar installations on roofs or facades of new buildings whose relevant construction area exceeds 300 m². Do not substitute the energy reference area or restrict that rule to non-residential buildings. Have the current legal text, cantonal implementation and any broader project requirements checked.
2. Use the canton’s current rules
Bern publishes requirements applying from January 2026 to new buildings and extensions. Its official page distinguishes, among other provisions, a baseline of 10% of the relevant construction area and use of at least 60% of the gross area of suitable roofs, subject to conditions and relief provisions. These figures are not a uniform federal rule. Use the form and implementation guidance that apply to your specific building.
3. Have an exception confirmed
A protected building, shading or technical difficulty does not automatically create an exemption. Ask the competent authority which evidence is required and whether an exception can be granted. Do not replace the installation with certificate purchases or a financial contribution without an applicable basis and explicit approval. Keep the decision with the approved plans.
4. Coordinate roof and electrical design
Assess area, shading, access, waterproofing, structural loads, wind and snow. Plan cable routes, protective devices, equipment location and the grid connection. A generic load per square metre cannot establish allowable roof loading. Compare the regulatory minimum with useful alternatives using expected consumption; a battery is not automatically necessary for a worthwhile project.
5. Prepare the budget and final inspection
The quote should separate equipment, roofing, connection, applications, options and confirmed grants. Establish who provides energy-compliance evidence, tests and handover documents. If electricity sharing is planned, define participants, metering and billing. Panels alone do not guarantee an internal tariff, a payback period or approval to occupy the building.