Do solar panels work on a Chicago home?

Chicago is not mostly single-family houses. The Census Bureau counts 1.28 million homes in the city. About 25% are detached houses. About 55% sit in buildings of four or fewer units. That counts detached houses and bungalows, row houses, two-flats, three-flats and four-flats. The other 45% are in bigger buildings.

Who decides, and what to ask first, depends on the case.

Permit steps, fees and roof setbacks are on our Chicago permit guide. We do not repeat them here.

Sun does not change much from one Chicago roof to the next. The tilt and the direction do. We asked the federal PVWatts model what one kilowatt of panels makes in a typical Chicago year with no shade.

Per panel, east-west pairs on a flat roof make about 13% less than a south-facing pitched roof. But pairs sit lower and closer together, so a flat roof can often hold more of them. Try your own roof below.

This is a model of a typical year with no shade. It is not a quote. Trees, a taller neighbor and snow on the panels all cut output. Winter output is about one-sixth of the year.

Chicago posts every building permit on its Data Portal, with the contractor, the roof and the system size. We counted the small solar permits issued from October 24, 2025 to October 23, 2026.

Three things stand out.

• Pitched roofs dominate. Flat and low-slope roofs were about 6.6% of permits, though flat roofs are common on older Chicago buildings. It can be done. Ask any installer how many flat roofs it has done.
• A few areas lead. The ten busiest community areas had about 41% of the permits.
• Waits are short, but not days. Half the permits took 10 days or fewer from application to permit. About 27% took two weeks or more. Your own wait adds the design, the install and ComEd's sign-off. See how the permit works.

The permit record shows who is busy. It does not show who is good.

Yes, and many do. But a flat roof adds questions that a pitched roof does not. Ask these before you sign anything.

Roof rules, such as how far panels sit from the roof edge, are in the permit guide. Whether any roof qualifies is in what your roof needs.

Every Chicago address is in ComEd's area. Chicago solar pays in a few separate ways, and each number moves. So we point to the pages that keep them current instead of printing numbers that go stale.

The City's own help is faster and cheaper permits. We found no City cash rebate on its Solar Express page. Income-eligible owners can look at Illinois Solar for All, and owners of one-to-four-unit homes in Cook County with incomes from 80% to 120% of area median income were the target of Sun and Save (see the alert above).

Search for solar companies in Chicago and you see ads, map listings and "best of" lists. They show who advertises. Chicago's permit record shows who actually installs here.

In the last 12 months, About 50 companies were named as the main contractor on a Chicago solar permit. The five busiest pulled about 76% of the permits. Several pulled just one. A shortlist from the top of a Google search may compare three of those 50.

Here is a Chicago method.

1. 1
   Ask each company for two recent Chicago addresses it has done.

   A real installer has them.

2. 2
   Look the company up in the City's permit data.

   Open the Chicago Data Portal's Building Permits list and filter work type to "Small-Scale Solar PV System." Count how many permits carry its name, and what roofs they were.

3. 3
   Check it against the state's records.

   Is it an Illinois Shines Approved Vendor, any suspensions, how it handles complaints, is its installer certified. Our statewide guide, best solar companies in Illinois, shows how to read those records and build a shortlist of three. The verify guide has the click-by-click steps.

4. 4
   Ask the Chicago questions.

   Who will pull the permit and who is on it? Have you done a flat roof or a two-flat like mine? Who handles ComEd's sign-off? What do you do about a shared roof or a landmark block?

5. 5
   Get three written quotes with the Illinois Shines Disclosure Form.

   Compare them with our quote checklist.

Solar on the wrong building costs money. Pause if one of these fits you.

• Your roof has under about ten years left. Replace it first.
• Neighbors' buildings or trees shade the roof for much of the day. Many Chicago lots are narrow, so side shade is common. Get the shade measured. See solar on a shaded roof.
• You rent, or your condo board will not agree. Rooftop solar is not your decision. Ask about community solar.
• Your building is a landmark. Expect a longer review. It is not a ban.
• Your electric bill is small. Payback takes longer. Run the payback calculator.

If none of that fits, check your roof first. The free solar check on this page looks at your roof and building, and tells you if solar is not a fit.