Hometriva logoHometriva

Jurisdiction directory

Illinois home project permits by county

Many Illinois households live outside city limits, where the county building department — not a city — issues the permit. 12 Illinois counties, covering the state's largest jurisdictions, are inventoried here.

Model reviewed August 2026

Counties covered

12

largest jurisdictions first

Municipalities tracked

17

in Illinois

Population covered

9.6M

residents in listed counties

Code basis

Local

Local adoption of the IRC; statewide plumbing and energy codes apply

Featured counties

The largest and most active permit jurisdictions in the state.

Cook County5,087,000 residents · seat ChicagoDuPage County933,000 residents · seat WheatonLake County711,000 residents · seat WaukeganWill County700,000 residents · seat JolietKane County517,000 residents · seat GenevaMcHenry County310,000 residents · seat WoodstockWinnebago County284,000 residents · seat RockfordMadison County264,000 residents · seat EdwardsvilleSt. Clair County255,000 residents · seat BellevilleChampaign County206,000 residents · seat UrbanaSangamon County195,000 residents · seat SpringfieldPeoria County180,000 residents · seat Peoria

All Illinois counties we cover

12 counties, largest first.

Cook CountySeat: Chicago · 5,087,000 residentsDuPage CountySeat: Wheaton · 933,000 residentsLake CountySeat: Waukegan · 711,000 residentsWill CountySeat: Joliet · 700,000 residentsKane CountySeat: Geneva · 517,000 residentsMcHenry CountySeat: Woodstock · 310,000 residentsWinnebago CountySeat: Rockford · 284,000 residentsMadison CountySeat: Edwardsville · 264,000 residentsSt. Clair CountySeat: Belleville · 255,000 residentsChampaign CountySeat: Urbana · 206,000 residentsSangamon CountySeat: Springfield · 195,000 residentsPeoria CountySeat: Peoria · 180,000 residents

Sources

Sources & verification

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.