Your roof: Préverenges
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.
Request plans, equipment references and service boundaries before accepting a price. Keep the simulation assumptions so results can be compared after commissioning.
Exposure and access: Préverenges
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.
Check building protection and appearance requirements with the relevant authority. Identify the service contact and stated response times after commissioning.
Full cost and grants: Préverenges
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.
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.
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: Préverenges
Define included and excluded work during the technical survey. Confirm voltages, currents and module compatibility with the selected inverter.
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 Vaud, distinguish between Pronovo, municipal aid and Buildings Program if solar accompanies a renovation. If this timeline is poorly managed, you lose time and sometimes value on aids.
Specify the work assigned to subcontractors and who is responsible for each task. Request a schedule that accounts for weather, access and team availability.
