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

A general residential building-permit requirement for ordinary homes in unincorporated Richland County could not be confirmed, so ask the Richland County Clerk whether the planned work needs local approval before construction. Illinois itself does not issue building permits, review plans or perform inspections for privately funded projects; those functions, when required, belong to the applicable local government¹.

The clear county exception is a mobile-home park: construction or alteration requires a permit, and County Engineer approval must come before issuance². The county uses Illinois Department of Public Health mobile-home-park rules as minimum standards unless a higher standard applies². Completed parks are inspected before licensing and remain subject to recurring county inspection². Illinois has also imposed statewide baseline building-code requirements since 2025, including a framework for places that have not adopted their own code¹.

Richland County's published materials do not identify a general residential building department or zoning official for unincorporated land. The state does not issue private-project building permits or occupancy certificates; any such requirement is handled by the municipality or county with jurisdiction¹. Start with the Richland County Clerk for an ordinary home, addition or outbuilding, and ask who will confirm the applicable state baseline and any project-specific county ordinance.

Specialized work has clearer destinations. For a mobile-home park, County Engineer approval precedes the building permit; after construction, the engineer inspects the completed park before the County Clerk issues its license². The Richland County Highway Department handles entrances on county-maintained roads, and the County Engineer is also the County Floodplain Administrator⁷. A project inside or near an incorporated municipality may face municipal requirements even though unincorporated Richland County has no county zoning ordinance⁵.

Richland County has no zoning ordinance for the unincorporated portions of the county, and county zoning districts are not published because the county does not have county zoning there³. No county zoning rule sets minimum lot size, minimum dwelling size, lot coverage or building height there^3,5. County zoning also does not restrict accessory-dwelling occupancy, but building, septic, floodplain, highway, subdivision and setback rules can still apply³.

Richland County does regulate more than zoning. The county has a setback-line ordinance, although the available county material does not give its distances, and it regulates subdivisions in unincorporated areas³. Municipal zoning may also apply in or near an incorporated municipality³. Before choosing a house site, ask the County Engineer about the setback line and floodplain, and ask the relevant municipal clerk whether municipal rules reach the parcel.

Private sewage disposal plans in Richland County must be reviewed and approved before construction under the Illinois program. IDPH regulates covered systems statewide, while a local health agency may review plans under a local ordinance or as an IDPH agent; the responsible local reviewer for Richland County could not be confirmed⁴. New and replacement surface-discharging systems covered by the Illinois EPA general permit have inspection, monitoring and reporting requirements, but that does not establish the same inspection rule for every conventional no-discharge system⁸.

Site suitability deserves attention early: only about 3.5% of Richland County soils avoid a “very limited” rating for conventional septic drain fields⁹. That countywide soil rating does not decide whether a parcel will pass, but it makes plan approval and site-specific soil work an early due-diligence item. Illinois permits specified off-grid sanitation options, including qualifying privies and composting, incinerating and recirculating toilets, while requiring other domestic wastewater to go to a conventional private sewage system¹⁰. Confirm the application path with IDPH before paying for design work.

A tiny home on unincorporated Richland County land faces no county land-use zoning restriction on occupancy and no county zoning minimum dwelling size, but building, septic, floodplain, subdivision, setback and municipal rules may still control placement^3,5. Temporary camping and RV occupancy likewise face no county zoning restriction in the unincorporated area, but sanitation, floodplain, highway and other rules still apply⁵.

The absence of a county zoning restriction does not confirm that every long-term residential RV arrangement is allowed, so ask the County Clerk about the intended use. Illinois campground licensing applies when an operation meets the state campground definition, but that rule does not decide one owner's private-parcel use¹¹. Manufactured-home occupancy is specifically regulated in county-regulated mobile-home parks; those park rules do not establish a countywide restriction on every manufactured home outside a park⁵. A mobile-home park must also connect to qualifying nearby public water and sewer unless the county and state approve the specified independent systems².

1. Confirm that the parcel is outside a municipality, because the county's no-zoning conclusion applies only to unincorporated Richland County³.
2. Ask the County Clerk whether the proposed home, accessory building or site work needs a local building permit or occupancy approval; Illinois does not issue those approvals for privately funded construction¹.
3. Take the site plan to the responsible septic reviewer for approval before constructing the private sewage system; confirm with IDPH whether a local health agency will handle the review⁴.
4. Obtain a permit through IDPH or the participating local health department before constructing a new private well¹².
5. Ask the County Engineer about the setback line, floodplain permit screening and any entrance on a county-maintained road^2,3,7.
6. If access meets a state-maintained road, obtain the required IDOT right-of-way permit before work begins¹³.

Put septic feasibility near the top of the offer contingency because only about 3.5% of county soils avoid a severe limitation rating for a conventional drain field⁹. A permit is required for new private-well construction, with IDPH and participating local health departments reviewing plans and inspecting wells¹².

Check floodplain status with the County Engineer before placing a home or driveway; the engineer is Richland County's Floodplain Administrator⁷. Richland County must require a permit for proposed construction or other development so it can determine whether the activity lies within the floodplain, and the application review must account for required federal and state approvals². Construction in regulated Illinois floodways can require state authorization as well¹⁴. Confirm road ownership because county-road entrances go through the Highway Department while state-highway access needs an IDOT permit^7,13.