Path-Q Solar
How should the expected electricity use from a planned home extension be included in a solar quote?
Answer
Tell the solar provider about the extension before the quote is finalized and ask for a design based on the home's expected post-extension load. The quote should identify assumptions for added floor area, heating and cooling, appliances, occupancy, and construction timing, and should show what changes if the extension is delayed or redesigned.
Key points
- An extension can add more than lighting and outlets if it includes heating, cooling, water heating, cooking, laundry, or other major loads.
- Use an energy estimate or comparable existing use rather than simply scaling current consumption by floor area.
- The quote should distinguish equipment capacity, expected annual production, and the ability to expand later.
- Electrical service, roof changes, and construction sequencing should be coordinated with the solar design.
What it depends on
- Extension size, insulation, windows, and intended use
- New appliances and whether heating or water heating will be electric
- Occupancy and expected operating patterns
- Construction timing, roof design, and available electrical capacity
Risks and trade-offs
- Using current bills alone can undersize the system after the extension is occupied.
- Sizing for uncertain loads can increase upfront cost and leave unused capacity.
- A later roof or service change can create redesign or reinstallation costs.
Information you may need
- Extension plans and construction schedule
- Planned appliances and mechanical systems
- Current bills and expected post-extension occupancy
- A quote showing current-load and future-load scenarios
Your next step
What to do next
Request a revised quote with documented post-extension assumptions, monthly production and consumption, and the cost of installing or reserving future expansion capacity.
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