Building permits, zoning and land rules in Logan County, Illinois

Yes. In unincorporated Logan County, new construction, additions, remodeling, accessory structures and portable structures require a county building permit; routine maintenance and repair, such as painting or re-roofing, do not¹. Agricultural-only structures receive a fee exemption rather than a stated permit exemption⁷. Residential construction costs $4 per $1,000 of construction cost with a $25 minimum, while additions and alterations cost $2 per $1,000 with the same minimum⁸.

Logan County has not adopted a local building code, but Illinois has imposed statewide baseline building-code requirements since 2025^1,4. For a single-family dwelling or an addition larger than 750 square feet, the owner hires an Illinois-licensed home inspector, and the Zoning Officer cannot issue a certificate of occupancy until construction is complete and the required inspection report is submitted⁵.

The Logan County Zoning Office reviews and issues building permits and also handles variances, conditional uses, special uses and rezoning in the county's jurisdiction². The office is at 529 S McLean St in Lincoln and can be reached at (217) 732-4773 or zoning@logancountyil.gov². Applications use county forms and, where applicable, include the parties involved, site description, survey, and approved water and sewage plans⁵.

Jurisdiction comes first: Logan County zoning covers unincorporated areas, while incorporated municipalities make their own zoning determinations^2,9. For rural land, give the Zoning Office the parcel number and project description and ask which forms, inspections, floodplain review and occupancy approval apply².

Yes. Logan County zoning applies to unincorporated land, while incorporated jurisdictions make their own zoning determinations^2,9. The county publishes Agricultural, Residential, Business and Manufacturing districts, and setbacks vary by district^1,9. Residential districts R-1 through R-3 use a 25-foot front setback, 30-foot rear setback and side setback equal to 10% of lot width¹. Request an official district determination because published maps may not reflect later rezonings⁹.

Only one dwelling is allowed on an existing country property; another dwelling must occupy its own parcel and meet that district's minimum lot size¹. Subdivision is regulated, although the county's published summary does not provide the full procedure or dimensional standard². Floodplain-related subdivisions face added elevation, boundary, drainage and damage-prevention requirements¹⁰.

The Logan County Department of Public Health administers private onsite sewage permits and inspections, while the Illinois Environmental Protection Agency regulates public sewers³. LCDPH's jurisdiction covers structures without accessible public sewer service or more than 300 feet from a public sewer connection³. Where municipal sewer is unavailable, the building-permit materials require a sewage-disposal plan approved in writing by the County Health Department⁵.

Before installing a private system, submit a soil analysis from an Illinois Certified Professional Soil Classifier and obtain the $200 LCDPH permit³. Only a licensed private-sewage installer or an owner installing the owner's own system may apply and perform the construction³. LCDPH inspects the installation before backfilling³. Because only about 12.2% of county soils are rated without severe limits for a conventional drain field, make the soil evaluation a purchase contingency rather than assuming a standard system will work¹¹.

Logan County allows temporary RV use during permitted dwelling construction, rehabilitation or reconstruction when the request is included with the building-permit application⁵. The RV must be at least 10 feet from the dwelling, satisfy applicable side and rear setbacks, and have health-department water and sewage approvals before the RV permit is issued⁵. Occupancy must end when the dwelling work is complete; the stated limit is one year unless the Planning and Zoning Committee grants an extension⁵. A broader private-land camping rule could not be confirmed, so ask the Zoning Office before planning any other RV stay².

The county separately regulates tiny homes in tiny-home parks as permanent-foundation dwellings between 200 and 800 square feet⁶. A park begins at three occupied tiny homes, needs at least five acres and proceeds as a conditional use⁶. Park water must connect to an available public supply within 500 feet, and all sewage must enter a common sewage system⁶. Road-facing park boundaries carry road-specific setbacks⁶. These park rules do not establish permission for a stand-alone tiny home elsewhere.

For a project in unincorporated Logan County, use this order:

1. Ask the Logan County Zoning Office to confirm the district, allowed residential use, setbacks and whether floodplain or subdivision review applies^1,2.
2. If municipal water or sewer is unavailable, obtain County Health Department approval for the water-supply and sewage-disposal plans⁵.
3. Submit the county building-permit application with the applicable site, survey and project documents before starting work^1,5.
4. Obtain the LCDPH septic permit and leave the installed system uncovered for inspection³.
5. For a new private well, obtain the state or approved local-health-department permit before work begins¹².
6. Arrange the required owner-hired inspection and obtain the Zoning Officer's certificate of occupancy before occupying a covered home⁵.

Start with an official zoning determination and confirm the intended dwelling, district setbacks, legal lot status and any need to subdivide^1,2,9. Treat septic feasibility as a purchase condition because about 12.2% of county soils are rated without severe limits for a conventional drain field, and the permit requires a professional soil analysis^3,11.

Ask whether the parcel lies in a floodplain: floodplain development needs a permit from the Zoning Officer before work begins unless exempted by law, and other required approvals must precede issuance¹⁰. Verify legal road access as well¹³. A residential driveway opening may not exceed 24 feet at the street line or 30 feet at the roadway, while controlled-access roads require additional agency and county permissions¹³. Work in a state-road right-of-way also needs an IDOT permit before it begins¹⁴.