Perry County, Illinois requires a building permit before most structures are erected, enlarged, altered or moved, including the placement or relocation of a mobile home; a structure under 100 square feet does not need the county permit.1 Obtain zoning compliance first, then file the building-permit application through the Supervisor of Assessments.2 A new home off city sewer also needs a private sewage disposal permit from the Perry County Health Department.3
At a glance
- Building permit
- Required for most structures; not required under 100 square feet1
- Zoning
- County zoning applies in unincorporated Perry County4
- Septic
- County Health Department permit required for a home off city sewer3
- RV living
- Long-term occupancy on an individual parcel was not confirmed; ask County Zoning4
- Tiny homes
- No separate tiny-home rule was confirmed; zoning district and permit rules still apply41
- Owner-builder
- The owner may apply, but no exemption from permit requirements was confirmed15
- Private well
- A permit is required before construction, modification or sealing6
Who to call
Building permits
Perry County Supervisor of Assessments
Perry County building-permit applications
3764 State Route 13-127, Pickneyville, Illinois 62274
Health department
Perry County Health Department
Private sewage disposal permits and environmental health questions
907 S MAIN ST - PINCKNEYVILLE IL 62274
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit in Perry County, Illinois?
Yes. Perry County requires a building permit before a covered structure is erected, enlarged, extended, altered or relocated, and before a mobile home is located or relocated.1 The county’s published exception is for a structure under 100 square feet.1 Do not read that size exception as a zoning exemption: development and structures in unincorporated Perry County still must conform to the zoning code.4
Perry County publishes a $5 farm-structure fee and a residential fee of $5 plus $0.02 per square foot; commercial and industrial rates are higher.7 The county ordinance covers permit administration and dangerous-building provisions, but the reviewed county material does not establish adoption of a complete technical building code.8 Illinois also has statewide baseline building-code requirements, so permit approval and structural-code compliance are related but separate questions.9
Who issues building permits in Perry County, Illinois?
The Perry County Supervisor of Assessments office accepts county building-permit applications, and an owner or authorized agent may apply.2 The office can be reached at (618) 357-2209 at the Perry County Government Building.10 The application calls for the property’s legal description, the proposed building’s size and type, and its estimated cost.1
Zoning approval comes first. Perry County says applicants must obtain a zoning compliance form or Certificate of Zoning Compliance before filing the building-permit application.2 Jurisdiction depends on location: unincorporated sites use county zoning, while Pinckneyville, Du Quoin, Willisville and Tamaroa have separate local zoning contacts.11 For a rural parcel, confirm the parcel is outside municipal limits and ask the county zoning office to identify its district before paying for final plans. County permit requirements apply countywide as described by the ordinance, while zoning administration varies by incorporated or unincorporated location.111
Does Perry County, Illinois have zoning?
Yes. Unincorporated Perry County has county zoning, and development, occupancy, lot creation and structures must comply with the county zoning code.4 The code includes Agricultural, two Residential districts, Commercial, Industrial, Flood Plain Overlay and Planned Unit Development districts; lot size, allowed uses, special uses, height and setbacks depend on the district.12 Incorporated municipalities may administer their own zoning, so the county rule should not be assumed to control a parcel inside municipal limits.11
For the principal county districts, published front setbacks range from 35 to 50 feet, side setbacks from 10 to 25 feet, and rear setbacks from 10 to 25 feet.13 Residential districts list a 25-foot maximum structure height, with a possible increase to 35 feet when the stated reciprocal setback conditions are met.14 Because these dimensions vary by district, obtain the parcel’s zoning designation and zoning-compliance approval before choosing a house footprint or ordering a manufactured home.2
How do septic permits work in Perry County, Illinois?
Anyone building a Perry County home that will not connect to city sewer must obtain a private sewage disposal permit from the Perry County Health Department.3 Contact the department at 618-357-5371 before finalizing the site plan.15 Illinois requires plan approval before construction of a new system, including certain major replacements or absorption-field changes, and requires notice to the department or local authority at least 48 hours before work begins.16
Treat soil suitability as an early feasibility question, not a closing-day detail. Only about 3.2% of Perry County soils are mapped without severe limitations for a conventional septic drain field, so a site evaluation may point toward a more involved system.17 The county may refuse a private sewage permit where public or community sewer is available; for a single-family residence, the county’s availability test includes sewer adjoining or abutting the property or lying within 300 feet.18 A private well also needs a permit before construction, modification or sealing.6
Can you live in an RV or tiny home in Perry County, Illinois?
Perry County’s reviewed rules did not confirm a general right to live long-term in an RV on an individual parcel, and the published material on travel-trailer parks does not answer that separate occupancy question. Ask County Zoning for a parcel-specific answer before buying land or connecting utilities. Unincorporated Perry County regulates development and occupancy through zoning districts, so the parcel’s district and proposed use matter.4
Perry County’s reviewed material also did not establish a separate tiny-home occupancy rule. A small dwelling should therefore be treated as a dwelling project subject to the applicable zoning district, setbacks and permit process, rather than assuming “tiny” creates an exemption.1213 The building-permit exception applies only to a structure under 100 square feet and does not itself establish permission to occupy that structure as a home.1 For either an RV or tiny home, get written confirmation of allowed occupancy, utility treatment and required approvals before purchase.
Building a home in Perry County, Illinois: steps in order
- Confirm whether the parcel is unincorporated or inside a municipality, because zoning contacts differ by location.11
- Ask the applicable zoning administrator for the parcel’s district, allowed residential use, lot requirements and setbacks; unincorporated land is governed by the county zoning code.413
- Obtain the zoning compliance form or Certificate of Zoning Compliance before submitting the county building-permit application.2
- Apply through the Supervisor of Assessments with the legal description, building size and type, and estimated cost.1
- If the home will not use city sewer, arrange the Health Department’s private sewage review before construction.3
- Obtain a private-well permit before well construction, modification or sealing.6
- If access enters a state-maintained road, contact the appropriate IDOT district because state-highway right-of-way work requires an IDOT permit before work begins.19
What should you check before buying land in Perry County?
Start with jurisdiction and zoning: verify municipal boundaries, the zoning district, allowed residential use, minimum lot requirements and the exact buildable envelope.111213 Then make septic feasibility a contract contingency, because only about 3.2% of county soils are mapped without severe limitations for conventional drain fields.17 Also determine whether public or community sewer is close enough for the county to treat it as available.18
Check legal and physical road access before assuming a driveway location. Access work in a state-maintained right-of-way requires an IDOT permit, and IDOT directs applicants to the appropriate district for project-specific requirements.19 Check floodplain constraints before placing a house, septic system or driveway, because regulated Illinois floodway construction can require state authorization.20 Finally, budget for property taxes: Perry County’s effective rate is about 1.7%, and the median annual property-tax bill is about $1,744.2122
Watch-outs
- A building permit is not the first approval: Perry County requires zoning compliance before it will accept the permit application.2
- A parcel near sewer may not qualify for private septic approval; the county can refuse a private-system permit where public or community sewer is available.18
- Long-term RV occupancy, tiny-home occupancy and a county owner-builder exemption could not be confirmed; ask County Zoning and the Supervisor of Assessments before relying on any of them.5
Sources
- Building Permits - Perry County, Illinois, quoted and re-checked
- Building Permits - Perry County, Illinois, quoted and re-checked
- Perry County Health Department - Sewage (2026 county census)
- Chapter 40 Zoning Code, quoted and re-checked
- (2026 county census)
- 77 Ill. Admin. Code 920.130, Water Well Permit Requirements (Illinois statewide rule), quoted and re-checked
- Building Permits - Perry County, Illinois, quoted and re-checked
- Buildings, Chapter 6, quoted and re-checked
- Illinois Codes (Illinois statewide rule), quoted and re-checked
- Perry County Supervisor of Assessments (ptab.illinois.gov)
- Building Permits - Perry County, Illinois, quoted and re-checked
- Chapter 40 Zoning Code, quoted and re-checked
- Chapter 40 Zoning Code, Section 40-4-31, quoted and re-checked
- Chapter 40 Zoning Code, Section 40-4-31, quoted and re-checked
- Perry County Health Department (perryhealth.net)
- 77 Ill. Adm. Code 905.190 Installation Approval (Illinois statewide rule), quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Health Codes, Chapter 16, 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
Written September 27, 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.