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

Yes. Mason County requires a building permit before construction on any parcel subject to the county zoning ordinance¹. The exceptions are routine maintenance or repair, alterations to an existing building costing less than $1,000, and a service connection to a municipally owned and operated utility¹. Apply to the County Zoning Enforcement Officer on the county's form; the application may require ownership, contractor, site, use, zoning, survey, access, sewage and water information¹. Work not substantially started within 180 days requires a new permit, and authorized work generally must finish within 24 months¹.

The County Zoning Enforcement Officer receives Mason County zoning-permit applications¹. Start with Mason County Zoning / Code Enforcement at 309-543-3759, option 9, or visit the County Courthouse at 125 N Plum, Havana IL 62644⁵. Ask for the parcel's zoning district, the correct application and the current fee because the ordinance establishes permit fees without listing every amount in the reviewed material¹. The official zoning map is maintained electronically and may also be viewed in the County Clerk's office¹. Septic permits and well permits do not come from the zoning office; the Mason County Health Department handles septic permits at 309-210-0110².

Mason County has zoning for areas subject to the county ordinance, while an incorporated village, town or city with its own zoning ordinance is outside the county system¹. District rules control allowed uses, lot area, dwelling size and setbacks¹. The ordinance has different minimum dwelling and lot sizes by district, so there is no single countywide number to use when screening a parcel¹. Confirm both the jurisdiction and zoning district before relying on a listing's description of buildability.

The Mason County Health Department issues local septic permits, while the Illinois Department of Public Health regulates private sewage-disposal systems statewide³. The county application must be approved before construction, and most residents then need a soil test before work begins². Reach the department at 309-210-0110 or visit 1002 East Laurel Ave., Havana, IL 62644². Every installed system must be inspected, including a system installed by the homeowner⁶. Where municipal sewer is unavailable, the sewage-disposal plan must receive Health Department approval and show that safe disposal is possible under applicable health rules¹. Only about 4.9% of county land is rated without severe limitations for a conventional drain field, making early site evaluation especially useful⁷. Private water wells need a permit for new construction, modification or sealing, with plans reviewed by the Illinois Department of Public Health or the local health department⁸.

Mason County allows a wheeled vehicle designed for sleeping or camping on a lot of record only as a temporary use authorized by the Zoning Enforcement Officer¹. The ordinance does not create a right to use an RV as an unrestricted long-term residence¹. A tiny home must fit the dwelling standards for its zoning district because minimum floor area varies by district¹. Manufactured homes outside approved parks or pre-approved sites have separate zoning-permit, site, size, age, well and septic conditions, so do not assume an RV, tiny home and manufactured home are treated alike¹.

1. Confirm whether county or municipal zoning governs the parcel, then obtain the district and applicable use, lot, dwelling-size and setback rules¹.
2. Apply to the County Zoning Enforcement Officer for the required building permit and current fee information¹.
3. Apply to the Mason County Health Department for septic approval, then arrange the required soil work and inspection^2,6.
4. If municipal water is unavailable, submit a Health Department-approved water-supply plan and obtain the required private-well permit before construction or land modification^1,4.
5. Resolve state-road access and regulated waterway, floodplain or wetland approvals before construction where applicable^9,10.

Verify the parcel's jurisdiction and zoning district first because county rules do not replace a municipality's own zoning ordinance¹. Then confirm the allowed use, minimum lot and dwelling size, setbacks, legal access, water source and septic feasibility¹. Only about 4.9% of Mason County land is rated without severe limitations for a conventional drain field, although about 99% has a slope of 15% or less; neither countywide figure substitutes for a parcel evaluation⁷. The countywide effective property-tax rate is about 2.1%, and the median annual property-tax bill is about $2,277⁷.