Bolthole Index

Grundy County, Illinois

Village of Mazon, Illinois: building permits, zoning and septic rules

The Village of Mazon, Illinois requires a building permit for all construction, with applications reviewed by the village Zoning Officer.1 Mazon administers its own zoning; Grundy County Health Department handles private septic systems through Environmental Health.23 Stored or parked house-car trailers cannot be used for living or sleeping inside Mazon.4

At a glance

Building permits
Required for all construction inside Mazon; Zoning Officer reviews applications1
Zoning
Village administers zoning regulations; ask the Zoning Officer for parcel-specific standards25
Septic systems
Grundy County Environmental Health reviews plans and issues private sewage disposal permits36
RV living
Stored or parked house-car trailers cannot be used for living or sleeping4
Occupancy approval
Occupancy permit required; Zoning Officer inspection precedes issuance78
Owner-built plumbing
Illinois offers a qualifying owner-occupant plumbing license exemption, subject to code and inspection requirements9

Who to call

Zoning

Village of Mazon Zoning Officer

Village building-permit application review and zoning inquiries

815-202-2725

[email protected]

520 Depot St, PO Box 33, Mazon, IL 60444

Building permits

Village of Mazon Planning & Inspection Department

Building-code and zoning enforcement, building inspections

Building permits

Village of Mazon permit forms desk

Residential and commercial application forms and published permit-fee link

(815) 448-2206

Online permits →

Septic permits

Grundy County Health Department, Environmental Health Division

Private sewage disposal plan review, septic permits and installation inspections; private well application review

(815) 941-3115

[email protected]

1320 Union St. Morris, IL 60450

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in Village of Mazon means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in the Village of Mazon, IL?

Mazon requires a building permit for all construction inside village limits, and the Zoning Officer must examine and approve a complete application before issuance.1 Mazon adopted the 2003 International Building, Residential and Existing Building Codes, alongside Illinois energy and accessibility codes.10 Illinois also has statewide baseline building-code requirements effective in 2025; ask the village which current standards govern your project before commissioning plans.11

Mazon construction must begin within 6 months of permit issuance and finish within 18 months of construction inception; the Village Board may extend either period by up to 6 months for good cause.1

Who handles building permits and zoning in the Village of Mazon?

The Mazon Zoning Officer reviews building-permit applications, and the zoning office is located in Village Hall.15 Reach the Zoning Officer at 815-202-2725 or [email protected], at 520 Depot St, PO Box 33, Mazon, IL 60444.5

Mazon publishes a Planning & Zoning Permit Application, a Contractor Registration Application and a permit-fee link on its Permits & Forms page; forms are also available at Village Hall.12 The village Planning & Inspection Department enforces building codes and zoning regulations and schedules building inspections.2 Ask the Zoning Officer to identify the zoning district and applicable lot-size, setback and dwelling-size standards before choosing a house plan.5

Can you live in an RV or tiny home in the Village of Mazon?

Mazon prohibits using stored or parked house-car trailers for living or sleeping, and maintaining a house-car trailer outside a duly licensed trailer camp is unlawful except as specifically permitted.4 Mazon trailer-camp stays are limited to 30 consecutive days, with additional cumulative limits and exceptions for the proprietor or bona fide employees.4

Do not assume parking a trailer on a building site authorizes occupancy: ask the Mazon Zoning Officer about the proposed arrangement before buying the trailer.45 We could not confirm Mazon-specific tiny-home, manufactured-home or accessory-dwelling permissions; ask the Zoning Officer whether your proposed dwelling qualifies in the parcel’s district.5

How do septic permits work inside the Village of Mazon?

Grundy County Health Department’s Environmental Health Division reviews private sewage disposal plans, issues permits for code-compliant systems and inspects installation work.63 Illinois requires plan approval from the applicable authority before constructing a new private sewage disposal system, and notice at least 48 hours before installation, repair or modification work begins.13

For a Mazon parcel, ask the village about sewer availability and connection requirements before designing an onsite system; we could not confirm the village’s connection mandate.5 Grundy County’s soil survey reports 0% of soils rated “not limited” for conventional septic drain fields: plan for a site evaluation and potentially an engineered system, rather than assuming septic is impossible.14

Building a home in the Village of Mazon: what are the steps?

  1. Ask the Mazon Zoning Officer to review the proposed use and identify the documents needed for your parcel.515
  2. Resolve sewer service with the village or discuss private sewage disposal plans with Grundy County Environmental Health before starting septic construction.5613
  3. Submit the complete Mazon building-permit application, including surveys, floor plans and other documents the Zoning Officer considers necessary, and obtain approval before construction.151
  4. Arrange village building inspections and obtain an occupancy permit after construction and Zoning Officer inspection before moving in.278

What should you check before buying land in the Village of Mazon?

For land outside village limits, use the Grundy County guide: the county’s Unified Development Code applies to unincorporated Grundy County, rather than serving as Mazon’s municipal zoning answer.16 Inside Mazon, take the proposed house location and use to the village Zoning Officer.5

We could not confirm Mazon’s agricultural exemption, driveway approval or floodplain development-permit requirements; ask the Zoning Officer which approvals the specific site needs.5 For a private well, Grundy County Environmental Health reviews well applications and processes permits.6 Illinois’s qualifying owner-occupant plumbing license exemption still requires code compliance and inspection, and local plumbing permit requirements can remain in force.917

Watch-outs

  • Mazon’s temporary occupancy permit for an addition or partial occupancy can last up to 6 months; ask the Zoning Officer about eligibility rather than treating it as trailer-living permission.74
  • A Mazon building permit expires and fees are forfeited if construction does not begin on time without an extension.1
  • Illinois allows certain off-grid human-waste options, but other domestic wastewater still needs a conventional private sewage disposal system; ask Grundy County Environmental Health how the proposed sanitation plan complies.186

Sources

  1. § 151.050 BUILDING PERMITS. (Village of Mazon), quoted and re-checked
  2. Village of Mazon Planning & Inspection Department (villageofmazon.org)
  3. Environmental Health, quoted and re-checked
  4. § 152.02 HABITATION AND MAINTENANCE OF HOUSE-CAR TRAILERS. (Village of Mazon), quoted and re-checked
  5. Village of Mazon Zoning Officer (villageofmazon.org)
  6. Grundy County Health Department, Environmental Health Division (grundycountyil.gov)
  7. § 151.051 OCCUPANCY PERMITS. (Village of Mazon), quoted and re-checked
  8. § 151.051 OCCUPANCY PERMITS. (Village of Mazon), quoted and re-checked
  9. HB5913 Enrolled — Illinois Plumbing License Law amendment (Illinois statewide rule), quoted and re-checked
  10. § 151.031 ADOPTION OF INTERNATIONAL BUILDING, RESIDENTIAL, ENERGY AND EXISTING BUILDING CODES. (Village of Mazon), quoted and re-checked
  11. Illinois Codes (Illinois statewide rule), quoted and re-checked
  12. Village of Mazon permit forms desk (villageofmazon.org)
  13. 77 Ill. Adm. Code 905.190 Installation Approval (Illinois statewide rule), quoted and re-checked
  14. 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
  15. § 151.050 BUILDING PERMITS. (Village of Mazon), quoted and re-checked
  16. codelibrary.amlegal.com (2026 county census)
  17. 225 ILCS 320/18 — Local regulation; Department standards (Illinois statewide rule), quoted and re-checked
  18. 77 Ill. Adm. Code 905.130 Human Waste Disposal (Illinois statewide rule), quoted and re-checked

Written October 12, 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.

Answers from the rulebook for Village of Mazon

Village of Mazon’s own rules

  • Building permitRequired

    All construction inside Mazon village limits.

    • A completed application must be received, examined, and approved by the Zoning Officer.
    • Construction must begin within six months of issuance and be completed within 18 months from construction inception; the Village Board may extend either period up to six months for good cause.
    • If construction does not begin within six months without an extension, the permit expires and fees are forfeited; failure to timely complete without an extension carries a $50-per-day penalty.

    construction commencement deadline: <= 6 months (After permit issuance; Village Board may extend up to six months for good cause.) · construction completion deadline: <= 18 months (From construction inception; Village Board may extend up to six months for good cause.)

    “A building permit shall be required for all construction within the village.”
  • Building code adoptedAdopted (with conditions)

    Buildings inside Mazon village limits.

    • The Village adopted the 2003 International Building, Residential, and Existing Building Codes; the Illinois Energy Conservation Code published January 1, 2024; and the Illinois Accessibility Code published October 23, 2018.
    • Ordinance 2012-01 passed April 2, 2012 and Ordinance 2024-05 passed June 24, 2024.
    “the International Residential Code, 2003 Edition, as published by the International Code Council, is hereby adopted as the Residential Code of the village”
  • InspectionsLimited

    Premises requiring an occupancy permit inside Mazon village limits.

    • Inspection by the Zoning Officer is required before an occupancy permit issues.
    • The premises must comply with applicable zoning-district requirements and Chapter 151.
    “premises have been inspected by the Zoning Officer”
  • Certificate of occupancyRequired

    Land, buildings, and structures inside Mazon village limits.

    • Apply coincidentally with the application for a zoning certificate.
    • The Zoning Officer issues the permit after construction is complete and inspection; a temporary permit may be issued for up to six months during completion of an addition or partial occupancy.
    • For multifamily structures, no unit may be occupied until an occupancy permit has issued for all units or the entire building.

    temporary occupancy permit duration: <= 6 months (During completion of an addition or partial occupancy.)

    “No land, building or structure shall be occupied [...] until an occupancy permit has been issued”
  • Living in an RVLimited

    House-car trailer living or sleeping inside Mazon village limits.

    • A house-car trailer may not be maintained outside a duly licensed trailer camp except as specifically permitted.
    • Except for the proprietor or bona fide employees, trailer-camp stays may not exceed 30 consecutive days, 30 days in any 45-day period, or two 30-day periods in one year.
    • Stored or parked trailers may not be used for living or sleeping and may not be a nuisance or fire hazard.

    trailer-camp consecutive stay: <= 30 days (Except proprietor or bona fide employees.)

    “It shall be unlawful for any person to maintain a house-car trailer in the village outside of a trailer camp”
  • Permit processPublished (with conditions)

    Building-permit applications inside Mazon village limits.

    • Applicant must submit a complete application and any surveys, floor plans, performance standards, or other documents the Zoning Officer considers necessary.
    • The Zoning Officer must examine and approve the application before issuance.
    • A conflicting permit is null and void.
    “It shall be the responsibility of the applicant to ensure that the application is complete”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Village of Mazon or Grundy County directly.

  • Owner-builder exemption — Owner-built residential construction inside Mazon village limits.
  • Minimum dwelling size — Single-family residential districts inside Mazon village limits.
  • Minimum lot size — Single-family residential districts inside Mazon village limits.
  • Setbacks — Single-family residential districts inside Mazon village limits.
  • Lot coverage — Single-family residential districts inside Mazon village limits.
15 more unanswered
  • Building height
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Village of Mazon publishes no rule on the point, not that none exists. Grundy County’s page lists the county offices to call.

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