Your roof: Vétroz
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.
Check the simultaneous consumption used to estimate avoided electricity purchases. Record who installs, inspects and supports each part of the system in the contract.
Exposure and access: Vétroz
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 a technical site survey before relying on a sales estimate. Confirm the supporting structure, anchor points and mounting design.
Full cost and grants: Vétroz
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.
Reserve space and access for inspections and future replacements. Include maintenance, insurance and foreseeable replacements in lifetime cost.
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: Vétroz
Compare quotation items for the same scope of work and supply. Price the necessary electrical distribution board changes and protection devices.
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 Valais, residential photovoltaics first go through Pronovo; Any municipal aid or other energy measures must be confirmed before signature.
Request the weather assumptions, losses and monthly results behind the stated output. Check how equipment can be accessed and components replaced without damaging the roof covering.
