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

At a glance

Building permit

Required for listed projects in unincorporated Sangamon County¹

Zoning

County districts govern unincorporated land; municipalities have separate rules²⁴

Septic

County permit required; hire a licensed septic contractor and soil scientist⁷

Private well

County permit required through Environmental Health and a licensed well professional⁶

Floodplain development

A county permit is required for development in the floodplain⁸

Driveway onto a county road

County Highway Department permit or installation required for access to a county highway⁹

Owner plumbing

A narrow state exemption covers qualifying owner- or lessee-occupants working on their own single-family residence¹⁰

RV or tiny home living

General occupancy rules are unconfirmed; ask Building and Zoning before placing or occupying one¹¹

Who to call

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Do you need a building permit in Sangamon County, Illinois?

Yes. Unincorporated Sangamon County requires building permits for listed projects including new construction, additions, alterations, foundations, mobile-home relocations, and accessory structures; some projects also need sub-permits¹. Sangamon County enforces amended adopted building codes for county-administered projects³. Illinois does not issue local permits for privately funded construction, so the applicable county or municipality handles the permit¹². Sangamon County's published fee schedule, dated December 1, 2025, charges a residential structure permit fee of $0.58 per square foot of living area with a $100 minimum, and $0.08 per square foot each for electrical, HVAC and plumbing permits, also with a $100 minimum¹³. A mobile home costs a flat $300 and a modular home a flat $600, each including zoning, electrical, HVAC and plumbing¹³. A narrow state exemption lets qualifying owner- or lessee-occupants perform plumbing work on their own single-family residence, but it is not a general exemption from building permits or other construction trades¹⁰. Sangamon County accepts agricultural-exempt permits, but the published material does not define eligibility or every requirement waived¹⁴. Ask Building and Zoning to classify a proposed farm structure before relying on that exemption¹¹.

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, inspections, and zoning administration from 200 S. Ninth St., Room 234, Springfield, IL 62701¹¹. Call (217) 753-6760 or email zoning@sangamonil.gov during weekday office hours¹¹. Applications are fillable and may be emailed to the department, and some projects require sub-permits¹⁵. The department also accepts home-occupation, fence, temporary-use, agricultural-exempt, and building permits¹¹. Before filing, tell the department whether the parcel is inside a municipality because municipal zoning requirements may apply separately⁴.

Does Sangamon County have zoning?

Yes. Sangamon County administers its zoning ordinance in unincorporated areas and accepts zoning amendments, variances, and conditional-use petitions². The ordinance establishes district boundaries and assigns uses to specific districts, so a use that works on one rural parcel may not work on another¹⁶. Incorporated municipalities may impose their own zoning requirements, so land inside a municipality needs confirmation from that municipality⁴. In the agricultural district the county lists a 30-foot front-yard setback, a 10-foot side-yard setback (15 feet on a corner lot) and a 30-foot rear-yard setback, while agricultural buildings have 0-foot side and rear setbacks¹⁷. An accessory building in a required rear yard may sit 3 feet from a side or rear property line, and a lot must have 20 feet of road frontage¹⁷. The county's chart leaves out maximum building height and some other yard and bulk rules, and we could not confirm a general minimum home size, minimum lot size or lot coverage¹⁷. Ask Building and Zoning for the parcel's district, allowed uses, and the remaining dimensional standards before designing a house, tiny home, accessory dwelling, or parcel split¹¹.

How do septic and well permits work in Sangamon County?

Sangamon County requires a permit to install a new septic system or repair or replace an existing system⁷. The owner must hire a licensed septic contractor and a licensed soil scientist; the contractor typically prepares and submits the application to the Sangamon County Health Department⁵⁷. Only about 25% of county soils rate free of severe limits for a conventional drain field, so settle septic feasibility before fixing a house site¹⁸. Private wells also require a county permit: use a licensed well-pump contractor for work on an existing well and a licensed well-driller for a new or replacement well⁶. Environmental Health works toward approval of submitted well plans within 7–10 business days⁶.

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 county assigns uses by zoning district and accepts temporary-use permits, but neither fact establishes that residential RV use or a tiny home is allowed on a particular parcel¹⁶¹¹. Floodplain rules separately treat a travel trailer placed for more than 180 days as development requiring a floodplain permit⁸. Before buying or moving a unit onto land, call Building and Zoning at (217) 753-6760 and ask whether the proposed occupancy is allowed in the parcel's district, whether a temporary-use approval applies, and which building and utility requirements must be met¹¹.

Building a home in Sangamon County: the steps, in order

1. Ask Building and Zoning whether county or municipal rules control the parcel, then confirm the zoning district, allowed use, and dimensional standards⁴¹⁶.
2. If the site lacks sewer service, hire a licensed soil scientist and septic contractor; the contractor typically files the county septic application⁷.
3. For a private well, hire the correct licensed well professional and complete the county well-permit process⁶.
4. Check whether the site is in the floodplain and obtain the required county floodplain-development permit before covered work⁸.
5. Submit the fillable building and zoning applications by email with any required sub-permits¹⁵.
6. For access onto a county highway, contact the Highway Department for the required permit or installation⁹.
7. If dividing land, account for County Engineer approval of public improvements within the county's subdivision jurisdiction¹⁹.

What to check before you buy land in Sangamon County

Before buying, confirm the governing jurisdiction and whether the intended house, tiny home, farm structure, or other use fits the parcel's zoning district⁴¹⁶. Do not assume a farm building qualifies for an exemption merely because the county accepts agricultural-exempt permits; eligibility and the scope of relief remain questions for Building and Zoning¹⁴. Check septic feasibility early because only about 25% of county soils rate free of severe limits for a conventional drain field¹⁸. Determine whether the homesite is in the floodplain, where covered development requires a separate county permit⁸. Confirm the road authority before planning access because the county rule specifically covers driveways onto county highways⁹. The effective property-tax rate is near 2%, and the median annual bill is about $3,369²⁰²¹.

Watch-outs

• We could not confirm the general occupancy rule for an RV or tiny home on unincorporated Sangamon County land; call Building and Zoning at (217) 753-6760 before buying or moving a unit in¹¹.
• Development in the floodplain needs a separate county permit, including a travel trailer placed for more than 180 days⁸.
• A county-highway driveway needs Highway Department approval, but we could not confirm access rules for municipal, township, or private roads⁹.
• Setbacks differ by zoning district and the county's chart does not cover every yard and bulk rule; confirm the standards for your parcel's district with Building and Zoning before siting a house or outbuilding¹⁷.

Sources

1. Permits, quoted and re-checked
2. Zoning, quoted and re-checked
3. Building, quoted and re-checked
4. sangamonil.gov, quoted and re-checked
5. Environmental Health, quoted and re-checked
6. sangamonil.gov, quoted and re-checked
7. Environmental Health, quoted and re-checked
8. Owning and Using Property in a Floodplain, quoted and re-checked
9. Highway Department, quoted and re-checked
10. HB5913 Enrolled — Illinois Plumbing License Law amendment (2026 county census)
11. Sangamon County Department of Building and Zoning (sangamonil.gov)
12. Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
13. Schedule of Selected Fees, quoted and re-checked
14. Zoning, quoted and re-checked
15. Permits, quoted and re-checked
16. Zoning Board of Appeals, quoted and re-checked
17. Lot Configuration and Setback Requirements, quoted and re-checked
18. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
19. sangamonil.gov, quoted and re-checked
20. Effective property tax rate: Bolthole Index county data
21. Median property tax bill: Bolthole Index county data

Written October 10, 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.