Your roof: Renan
For a detached house, check roof condition, shading and electrical capacity before signing. A single owner’s decision still requires a technical roof survey.
In all cases, the useful surface area is almost always less than the gross surface area announced. Skylights, chimneys, setbacks, shading and future maintenance needs must be integrated before talking about final power.
Prepare a timetable showing procedures, approvals and work in their actual sequence. Compare mounting and removal arrangements against the condition of the roof covering.
Exposure and access: Renan
Request a survey of nearby shading and the horizon, with monthly generation estimates. Compare options for your building using the same weather data and loss assumptions.
Request plans, equipment references and service boundaries before accepting a price. Record amounts, deadlines and revision terms in the offer.
Full cost and grants: Renan
The displayed scenario uses an indicative installed cost for 8 kWp. A quote must specify equipment, roofing and electrical work, connection, inspections and fees before deducting confirmed grants.
Programmes depend on the municipality and available funds. Obtain written confirmation of amounts, timing, limits and combined support for your address before including them in the budget.
Check building protection and appearance requirements with the relevant authority. Identify the service contact and stated response times after commissioning.
Output must be assessed for the actual roof, its orientation, shading and condition. Tariffs depend on the grid, product and contract; a cantonal average does not replace your bill.
Building procedures: Renan
Show chimneys, roof windows and other obstacles on the installation layout. Identify the service contact and stated response times after commissioning.
A serious estimate specifies who prepares the announcement, who manages the connection, who follows the administrative back and forth and how any comments are absorbed into the planning.
In the canton of Bern, photovoltaics are supported via Pronovo; building or municipal aid must be verified separately before signature.
Compare quotation items for the same scope of work and supply. Record who installs, inspects and supports each part of the system in the contract.