Why costs vary so much for a 2000 sq ft house
Square footage alone doesn’t determine system size or cost. Two homes with the same floor area can use very different amounts of electricity depending on climate, number of occupants, heating and cooling systems, and appliance efficiency. Other major cost drivers include the system size an installer recommends, the types of panels and inverters quoted, whether a battery is included, roof condition and complexity, local permitting and grid interconnection fees, and available incentives. National installers such as Sunrun, SunPower, and Tesla Energy Solar may present quotes differently than a local contractor, so look past branding and compare the same line items across bids.
How to estimate the system a 2000 sq ft house might need
Start with your recent electricity bills—total kWh for the last 12 months is the best single input an installer will use. Next, consider your location’s solar resource: installers use that number to estimate yearly production per kilowatt of panels. Roof size, orientation, tilt and shading determine how much panel area you can actually install. The practical step: ask each installer to provide a production estimate based on your actual bills and a site assessment or rooftop photos. That way each quote is aiming at the same production target and you can compare apples to apples.
What to compare on every quote
Look beyond the headline price. Key items to compare: total project price and price per watt, proposed system size (kW), panel make and model, inverter type, estimated yearly production and assumptions used, included hardware (racking, wiring, meters), permit and interconnection fees, installation timeline, maintenance and monitoring offerings, how replacements or failures are handled, and the installer’s credentials and references. Also compare financing or purchase terms if offered. Tradeoffs are common: lower price per watt can mean lower-efficiency panels, shorter performance information, or fewer included services. Ask each company for a written production guarantee or performance estimate and for past customer references with similar homes.
Practical next steps before you request quotes
Gather your last 12 months of utility bills, take clear photos of your roof from the ground, and note any trees or nearby shading. Decide whether you want battery backup or a system sized to cover only a portion of your usage. Contact at least three installers — include a local contractor and a national player such as Sunrun, SunPower, or Tesla Energy Solar — and request written estimates that use the same production target. Ask installers to explain their assumptions, to show the math behind estimated production, and to list what’s and isn’t included. Finally, confirm who will handle permits and the utility interconnection paperwork so there are no surprise fees.