Putnam County, Illinois requires a county building permit for construction, although the published material does not clearly state every exception1. The county has zoning, uses an International Code Council building code dated 2009 and inspects all new buildings23. Private sewage systems require approval before installation, with local service through the Bureau, Putnam & Marshall County Health Department45.
At a glance
- Building permit
- Required; the county publishes the application, fees and procedure, but project-specific exceptions need confirmation16
- Building code
- International Code Council code dated 2009; all new buildings are inspected3
- Zoning
- County zoning applies; parcel standards depend on the district278
- Septic permits
- Approval is required before installation; local plan review, permits and inspections go through the health department45
- Owner-installed septic
- Allowed on an owner-occupied property when all requirements are met9
- RV or tiny-home living
- County rules could not be confirmed; ask the Zoning & Floodplain Office before relying on either use2
- Private well
- A state or approved local health-department permit is required before construction, deepening, modification or sealing10
- Septic soils
- Only 21.1% of county soils lack severe limits for a conventional drain field11
Who to call
Zoning
Putnam County Zoning & Floodplain Office
County building permits, zoning administration and floodplain questions
120 N Fourth St, Hennepin, Illinois 61326
Health department
Bureau, Putnam & Marshall County Health Department
Private sewage disposal permits, plan review and inspection for Putnam County
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 Putnam County, Illinois?
Yes. Putnam County publishes a building-permit application, fee document and building-and-zoning procedure, supporting a required county permit for construction; the listing does not state every covered project or exception, so confirm your project before work begins16. Putnam County uses an International Code Council building code dated 2009 and inspects all new buildings, although the source does not identify the specific model code3. Illinois does not issue building permits, conduct building-code inspections or issue occupancy certificates for privately funded construction; those matters go to the local government with jurisdiction121314. Illinois has required a statewide building-code baseline since January 1, 2025, and locally adopted structural codes must satisfy the applicable baseline15.
Who handles Putnam County building permits, and how do you reach the office?
Start with the Putnam County Zoning & Floodplain Office at 120 N Fourth St, Hennepin, Illinois 61326, or call 815-925-927016. The county publishes a building-permit application, fee document and building-and-zoning procedure6. Ask the office to confirm the permit category, required plans, current fee, inspection sequence and any occupancy sign-off; all new buildings are inspected, but the published facts do not give the inspection stages or confirm a county occupancy-certificate rule3. If the parcel is inside an incorporated municipality, ask that municipality whether its rules and permitting office apply; the available county material does not establish each municipality's jurisdiction. Putnam County also regulates subdivision activity under a county subdivision ordinance described as having been adopted around 1968, although current standards were not available in the reviewed source17.
Does Putnam County have zoning?
Yes. Putnam County has an adopted county zoning ordinance administered through the Zoning & Floodplain Office2. Setbacks and building-height limits are district-specific rather than one statewide measurement, so the parcel's zoning district must be identified before a site plan is finalized78. The available sources did not confirm county rules for minimum dwelling size, minimum lot size, lot coverage, accessory dwellings, long-term RV occupancy or tiny homes. Ask the Zoning & Floodplain Office for the parcel's district and the current standards that apply to the intended use16. Manufactured homes may be occupied as dwellings under Illinois rules when properly installed, but local zoning, building, floodplain and utility requirements still apply18. A proposed split of land also deserves an early county review because Putnam County has a subdivision ordinance, while the reviewed source does not provide its current standards17.
How do septic permits work in Putnam County?
A private sewage system in Putnam County needs plan review and installation approval before construction4. The Bureau, Putnam & Marshall County Health Department provides local plan review, permits and inspections5. Before applying, the department says a Certified Soil Classifier or Illinois Licensed Professional Engineer must determine the site's soil absorption capacity9. The health department requires 48 hours' notice before work so it can schedule the final inspection before backfilling9. A state-licensed, county-registered installer normally performs the work, but an owner may do the work on an owner-occupied property when all requirements are met9. Test feasibility early: only 21.1% of Putnam County soils lack severe limits for a conventional drain field11.
Can you live in an RV or tiny home on land in Putnam County?
We could not confirm a Putnam County rule that allows or prohibits long-term RV living, temporary private-land camping or tiny-home occupancy. Putnam County has county zoning, so ask the Zoning & Floodplain Office how the parcel's district treats the proposed dwelling, temporary occupancy and utility setup before buying or moving a unit onto the site216. Illinois campground rules address qualifying campgrounds and temporary RV parking, not the separate question of living in an RV on one's own parcel19. Illinois allows manufactured homes as dwellings when installation requirements are met, including installation by a licensed installer or the homeowner according to manufacturer instructions, while local zoning, building, floodplain and utility requirements remain applicable18. Illinois also recognizes specified privies, portable toilets, recirculation toilets, incinerator toilets and compost toilets for human waste, but other domestic waste still requires a conventional private sewage disposal system20.
Building a home in Putnam County: the steps, in order
- Ask the Putnam County Zoning & Floodplain Office to identify the parcel's zoning district, setbacks, allowed dwelling type and floodplain status216.
- If the land will be divided, ask whether the county subdivision ordinance applies before designing or recording lots17.
- Use the county's published application and procedure to apply for the building permit, then confirm the fee and inspection stages; all new buildings are inspected63.
- Obtain a state or approved local health-department permit before constructing, deepening, modifying or sealing a private well10.
- Obtain an IDOT permit before work in a state-maintained highway right-of-way21.
- Give the health department 48 hours' notice before septic work and have the system inspected before backfilling9.
What should you check before buying land in Putnam County?
Confirm zoning and legal access first: Putnam County has zoning and a subdivision ordinance, while parcel standards and current subdivision requirements require office confirmation217. Check flood status before designing a building pad because regulated Illinois floodway construction requires approval, with applicability depending on stream drainage area and location22. Test septic feasibility early because only 21.1% of county soils lack severe limits for conventional drain fields11. A private well requires a permit before construction, deepening, modification or sealing, and the application must address separation from septic components and other contamination sources10. Putnam County's effective property-tax rate is about 1.6%, and the median annual property-tax bill is about $2,6682324. The county is lightly populated at about 34.7 people per square mile, and 91.9% of its land has a slope of 15% or less2526.
Watch-outs
- The county publishes permit forms and procedures but does not clearly state every project covered or exempted, so confirm the requirement with the Zoning & Floodplain Office before construction616.
- Only 21.1% of Putnam County soils lack severe limits for a conventional septic drain field, so obtain the soil assessment before committing to a building site119.
- Putnam County's RV, tiny-home, minimum-size and lot-coverage rules could not be confirmed; ask the Zoning & Floodplain Office about the parcel's district and intended use216.
Sources
- Putnam County Zoning & Floodplain Office - Document Library (2026 county census)
- Putnam County Zoning & Floodplain Office - Document Library (2026 county census)
- Putnam County Risk Assessment - Draft, quoted and re-checked
- Private Sewage Disposal, quoted and re-checked
- Sewage Program, quoted and re-checked
- Document Library - Zoning & Flood Plain Office, 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
- 55 ILCS 5/5-12001 — Authority to regulate and restrict location and use of structures (Illinois statewide rule), quoted and re-checked
- Bureau, Putnam & Marshall County Health Department (bpmhd.org)
- Illinois Water Well Construction Code, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
- Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
- Illinois Codes FAQ (Illinois statewide rule), quoted and re-checked
- Illinois Codes (Illinois statewide rule), quoted and re-checked
- Putnam County Zoning & Floodplain Office (putnamil.gov)
- Putnam County Risk Assessment, quoted and re-checked
- Manufactured & Modular Homes/Mobile Structures (Illinois statewide rule), quoted and re-checked
- Youth Camps and Campgrounds (Illinois statewide rule), quoted and re-checked
- 77 Ill. Adm. Code 905.130 Human Waste Disposal (Illinois statewide rule), quoted and re-checked
- Highway Permits (Illinois statewide rule), quoted and re-checked
- Permit Program (Illinois statewide rule), quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Population density: Bolthole Index county data
- Share of land at 15% slope or less: 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.