How much deposit can a solar panel installation contractor ask for in Illinois?

Illinois has no statutory cap on contractor deposits. No statewide statutory cap. Chicago's MCC restricts but does not flat-cap deposits. For solar panel installation, industry standard is 10% — meaning on a $23,595 project, expect $2,360 max. Any request above $3,539 is a red flag.

Industry standard for solar panel installation: 10%. Long lead time but rebate/incentive-funded. Industry standard: 10% deposit, then milestones at panels-delivered / installed / utility-approved. Most legitimate Illinois contractors will follow this norm regardless of whether the state has a statutory cap.

Illinois doesn't have a statutory cap, but industry-standard deposits sit between 10–25% for most solar panel installation projects. A request above 15% is a strong signal of cash-flow problems (the contractor is funding earlier jobs with your money) or outright fraud risk. Get 2 more written quotes before signing anything.

Best practice in Illinois: 10% deposit at contract signing → milestone-based progress payments tied to inspectable phases (rough-in, mid-build, substantial completion) → 5–10% retention held until punchlist + final inspection sign-off. Never pay materials in full upfront; if your contractor goes under, the materials supplier owns those goods, not you. Pay via check or credit card — never wire transfer to a personal account.