Bolthole Index

Bolthole Index county-legal census · checked 2026-10-07

Illinois Counties With No Building Codes

20 of Illinois's 102 counties — 20% — do not require a residential building permit in their unincorporated areas. That is the 9th-largest count of any state. The strongest of them on the Bolthole Index is Brown County (83/100). Every entry below cites the county’s own official source.

Rules change, and cities inside these counties set their own — treat this as a verified starting point, not legal advice. All 627 counties nationwide → Illinois: no zoning → Illinois: no codes, no zoning → Illinois: owner-builder → Illinois: rv living → Illinois: tiny homes → Illinois: no minimum home size → Full Illinois profile →

From the Illinois guide

Which Illinois counties don't require a building permit?

Illinois has 20 counties that do not require a residential building permit in unincorporated areas, including Brown County, Schuyler County, Crawford County, Clark County, Clay County, Wayne County, Greene County, Effingham County.1 Another 23 counties require a building permit only in some cases, while 59 require a residential building permit.67 Use the Illinois no-building-codes county list to compare counties by their building-permit answers.1

Illinois's statewide building-code baseline took effect in 2025, including requirements for jurisdictions without adopted local codes, so the absence of a county building permit does not remove the applicable state code requirements.13 The State does not issue building permits for privately funded construction; any required building permit comes through the local government.14 CDB's Building Codes and Regulations office provides local code directories; ask the local code official which requirements apply to the proposed home.15

Read the full Illinois guide →

Sources

  1. Bolthole Index county rulebook, 102 Illinois counties, as of October 10, 2026: Illinois counties that do not require a residential building permit in unincorporated areas
  2. Bolthole Index county rulebook, 102 Illinois counties, as of October 10, 2026: Illinois counties that require a residential building permit only in some cases (for example floodplain or certain structures)
  3. Bolthole Index county rulebook, 102 Illinois counties, as of October 10, 2026: Illinois counties that require a residential building permit in unincorporated areas
  4. Illinois: Illinois Codes, quoted and re-checked
  5. Illinois: Illinois Codes FAQ, quoted and re-checked
  6. Illinois Capital Development Board — Building Codes and Regulations (cdb.illinois.gov)

From the Illinois guide, written from the cited official sources and re-checked by an independent reviewer. This is research, not legal advice: confirm with the office before you buy or build.

20 of 102 Illinois counties · sorted by Index score

Keep exploring

Every county here has a full profile — water, land prices, hazard safety, seclusion, and the rest of its building rules. See the Illinois state page for all 102 counties ranked, or go back to the national list.

Off-grid gear

Building on land in one of these Illinois counties? The kit we'd start with:

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General guidance, not legal advice. Off-grid, building, and land-use rules are often set at the county level and change often. Verify with your county and state before acting. Data reviewed 2026-06-26.