Three business days, two permits, two inspections
The sequence in Rockford is documented rather than folkloric. A residential rooftop solar project needs a building permit and then an electrical permit, both applied for online, and the city processes them in three business days or less once all the required information has been submitted. That last clause is where projects actually slow down: the clock runs on a complete application, so what your installer submits determines whether the published turnaround applies to you.
Two inspections are required on a residential install, a final structural and a final electrical. The city's policy is to complete a requested solar inspection within five business days. Between the two permits and the two inspections, that is four scheduled touchpoints, and knowing the list means you can ask which one a stalled project is waiting on.
Ask your contractor to confirm they submit online and to show you the package before it goes in. Ask also who requests the inspections. These are small questions, but they are the difference between a published three-day review and a fortnight of back and forth over missing information.
Zoning: allowed everywhere, reviewed administratively
Rockford's zoning ordinance permits solar in every zoning district, subject to an administrative-level performance review by planning staff. That review does not include a subjective design review process and there is no design review committee involved.
That matters more than it sounds. In cities where an appearance-based body reviews solar, an application can be refused or trimmed on aesthetic grounds, which introduces both delay and uncertainty that nobody can quote you a price for. An administrative performance review is a checklist against standards rather than a judgement about how the array looks.
For you it means the design conversation can stay technical: where the production is, what the structure carries, how the array is wired. If a contractor tells you the city may object to the appearance of panels on your street, ask them to point to the ordinance provision, because the published position is that no such subjective review exists.
What ComEd pays for what you export
As of 2025, new residential and small commercial net metering customers in ComEd territory moved from full retail rate net metering to supply-only net metering. Exports are credited against the electricity supply portion of the bill rather than the full retail rate, so an exported kilowatt-hour is worth less than one you consume as you produce it.
The design consequence is to size against your own consumption rather than the available roof, and to move flexible load into daylight where you can. Both are ordinary habits rather than sacrifices, and together they shift value from the narrower export credit to the full retail rate you avoid paying.
Illinois net metering has been through ongoing Illinois Commerce Commission proceedings, so terms can move again. Ask your installer to confirm the current tariff for your address at the point of quoting, and treat undated online guidance with suspicion, since much of it still describes the pre-2025 arrangement.
Rockford roofs and annual output
The planning figure is about 1,266 kWh a year for every kW installed, derived from satellite irradiance with a standard performance ratio applied rather than measured locally. It is the number for deciding whether to get quotes; the survey produces the one that belongs in a contract.
Single-detached houses are 61.5 percent of the 67,423 housing units here. Two-unit buildings hold 9.7 percent, a meaningful share, and roof rights there can involve more than one owner, on top of the question of which electrical service the array feeds. Three and four unit buildings hold another 7 percent, and buildings of 20 or more units 7.5 percent, where the roof is the owner's or the association's rather than a resident's.
Whatever the building, ask for production modelled per roof plane with the shading assumptions written down. A single house-level number cannot show whether the last few panels are productive or simply filling space, and that is the difference between two quotes that look identical on price per watt.
Incentives, and the one that lapsed
Illinois Shines is the state Adjustable Block Program run by the Illinois Power Agency. Under its Distributed Generation track, Approved Vendors receive Renewable Energy Credit payments and may pass that value to you as reduced equipment or installation cost. You have to use an Approved Vendor, and how much is passed through varies, so ask each vendor for the Disclosure Form that shows exactly how much of the REC payment reaches you.
Illinois Solar for All is separate and income-based, serving homeowners, renters through community solar and multifamily building owners on terms designed so participants pay less for electricity than they would have without solar.
The 30 percent federal residential tax credit under Section 25D applied through December 31, 2025 and is not available for a purchased home system placed in service after that date. A 2026 purchase in Rockford cannot claim it, and any payback figure that still assumes it should be rebuilt. If you take a lease or a power purchase agreement, the provider may claim the business version under Section 48E and reflect part of it in your rate, which is a question for them and for a tax advisor.