Unincorporated Sangamon County, Illinois requires a county building permit for a new home, addition, or accessory structure12. The county administers zoning in unincorporated areas, while applicants must also satisfy municipal zoning requirements where applicable3. Start a new, replacement, or repaired septic system with a licensed contractor and Sangamon County Environmental Health45.
At a glance
- Building permit
- Required in unincorporated Sangamon County, issued by the Department of Building and Zoning16
- Zoning
- County zoning applies in unincorporated areas; municipal zoning requirements may also apply3
- Septic
- Permit application to Sangamon County Environmental Health; hire a licensed septic contractor and licensed soil scientist4
- Private well
- Water Well Permit Application through Sangamon County Environmental Health, filed by a licensed well contractor5
- Septic soil suitability
- Only about 25% of county soils rate free of severe limits for a conventional drain field7
- Driveway onto a county road
- County Highway Department permit or installation required for access to a county highway8
- RV or tiny home living
- Not addressed on the county's own pages; the Zoning office issues temporary-use permits, so confirm before living in one full-time6
Who to call
Building permits
Sangamon County Department of Building and Zoning
Building permits, inspections, and zoning ordinance administration (petitions, variances, home occupation, fence, temporary use, and ag-exempt permits) for unincorporated Sangamon County
200 S. Ninth St., Room 234 Springfield, IL 62701
Building permits
Sangamon County Building and Zoning - Permits page
Lists which projects need a permit and how to apply
Septic permits
Sangamon County Department of Public Health, Environmental Health
Septic system permits, private well permits, and general environmental health for unincorporated Sangamon County
2833 South Grand Avenue East Springfield, IL 62703-2175
Roads & driveways
Sangamon County Highway Department
Driveway and roadway access permits onto county highways, and oversize/overweight vehicle permits
3003 Terminal Avenue Springfield, IL 62707
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Sangamon County, Illinois?
Yes. Unincorporated Sangamon County requires a building permit for a new home, addition, or accessory structure12. The county permit list includes single-family homes, mobile-home relocations, garages, sheds, storage buildings, carports, and barns; some projects also require sub-permits2. Illinois does not issue the local building permit for privately funded construction, so the applicable county or municipality handles that requirement9. Sangamon County also accepts Ag-Exempt Permits, but the published fact does not establish which structures qualify or what requirements the permit waives; ask Building and Zoning before treating a farm structure as exempt10.
Who is the Sangamon County building department, and how do you reach them?
The Sangamon County Department of Building and Zoning handles county building permits and zoning from 200 S. Ninth St., Room 234, Springfield, IL 627016. Call (217) 753-6760 or email [email protected] during its weekday office hours6. County building and zoning applications are fillable and may be emailed to [email protected], although some projects need sub-permits and applicants must satisfy any applicable municipal zoning requirements first11. The department also accepts home-occupation, fence, temporary-use, and Ag-Exempt Permits6.
Does Sangamon County have zoning?
Yes. Sangamon County administers zoning in unincorporated areas, while separate municipal zoning requirements may apply where a municipality has authority; applicants must satisfy those municipal requirements before submitting the county application when applicable3. The county Zoning Ordinance was adopted April 22, 1969126. Setbacks and building-height limits depend on the parcel's zoning district rather than one statewide figure1314. We could not confirm a countywide minimum home size, minimum lot size, or numeric setback from the available rules, so ask Building and Zoning for the parcel's district standards before designing a house or dividing land.
How do septic and well permits work in Sangamon County?
A permit is required to install a new septic system or repair or replace an existing one in Sangamon County4. Hire a licensed septic contractor, who typically completes and submits the application to the Sangamon County Health Department, and a licensed soil scientist to determine how the soil affects system type and installation4. Local health agencies participate in plan review within Illinois' statewide regulation of private sewage systems, including qualifying systems with no surface discharge and treated-effluent systems up to 1,500 gallons per day15. Only about 25% of county soils rate free of severe limits for a conventional drain field, making the site-specific soil evaluation especially important7. Environmental Health also handles private-well applications through licensed well professionals5.
Can you live in an RV or tiny home on your land in Sangamon County?
We could not confirm a general rule allowing full-time RV or tiny-home occupancy on private land in unincorporated Sangamon County. The Department of Building and Zoning accepts temporary-use permits, but that fact alone does not establish that an RV residence qualifies6. Illinois' manufactured-home rules address licensed communities with five or more sites under stated conditions, so those rules do not answer the single-parcel question16. Before buying or moving a unit onto land, call Building and Zoning at (217) 753-6760 and ask about the parcel's zoning district, dwelling standards, utilities, and any temporary-use approval6.
Building a home in Sangamon County: the steps, in order
- Ask Building and Zoning to confirm whether county or municipal zoning applies and identify the parcel's use and dimensional rules3.
- For land without sewer service, hire a licensed soil scientist and septic contractor; the contractor typically files the septic application with the county health department4.
- If you need a private well, use the licensed well professional and county application process described by Environmental Health5.
- Submit the fillable county building and zoning application by email and include any required sub-permits11.
- For a driveway connecting to a county highway, contact the Highway Department for the required permit or installation8.
- For a subdivision, account for County Engineer approval of public improvements within the county's subdivision jurisdiction17.
What to check before you buy land in Sangamon County
Before buying, confirm which zoning authority controls the parcel and whether the intended house, tiny home, farm structure, or other use fits the applicable district3. Do not assume an agricultural building is exempt merely because Sangamon County accepts Ag-Exempt Permits; eligibility details remain a question for Building and Zoning10. Check septic feasibility early because only about 25% of county soils rate free of severe limits for a conventional drain field7. Confirm whether proposed access meets a county highway, because that is the access covered by the county permit rule8. The effective property-tax rate is near 2%, and the median annual bill is about $3,3691819.
Watch-outs
- We could not confirm whether or for how long an RV or tiny home may be occupied on unincorporated Sangamon County land; call Building and Zoning at (217) 753-6760 before buying or moving a unit in6.
- A county-highway driveway needs Highway Department approval, but this fact does not establish the access rules for municipal, township, or private roads8.
Sources
- Sangamon County Department of Building and Zoning - Building Permits (2026 county census)
- Sangamon County Building and Zoning - Permits page (sangamonil.gov)
- Zoning, quoted and re-checked
- Environmental Health, quoted and re-checked
- Sangamon County Department of Public Health, Environmental Health (sangamonil.gov)
- Sangamon County Department of Building and Zoning (sangamonil.gov)
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Sangamon County Highway Department, quoted and re-checked
- Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
- Department of Building and Zoning for Sangamon County, quoted and re-checked
- Building Permits, quoted and re-checked
- Sangamon County Department of Zoning (2026 county census)
- 55 ILCS 5/5-12001 — Authority to regulate and restrict location and use of structures (Illinois statewide rule), quoted and re-checked
- 55 ILCS 5/5-12001 — Authority to regulate and restrict location and use of structures (Illinois statewide rule), quoted and re-checked
- Environmental Health, quoted and re-checked
- Manufactured & Modular Homes/Mobile Structures (Illinois statewide rule), quoted and re-checked
- Sangamon County Highway Department, quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.