Bolthole Index

St. Clair County, Michigan

Building permits, zoning and septic rules in St. Clair County, Michigan

65Index Score / 100
#53 of 83 in Michigan

St. Clair County, Michigan requires building permits, but has no county construction-code program: apply to the state or local enforcing agency for the parcel12. Zoning depends on the city, village or township governing the land3. The St. Clair County Health Department handles septic permits for covered systems without public sewer and private-well permits countywide45.

At a glance

Building permit
Required; the state jurisdiction list identifies the state or local enforcing agency12
Zoning
Set by each city, village or township, not the county; confirm the local ordinance for the parcel3
Septic permit
Required before installation or repair of covered systems through the St. Clair County Health Department6
Private well permit
Required before work starts; residential Type III fee is $2255
Owner-builder
Michigan's builder-licensing law excepts a person building a residence for own use and occupancy; building permits and inspections still apply7
Septic soil suitability
Only 0.1% of mapped soil is free of severe limits for a conventional drain field8
Effective property tax rate
1.2% of value; median bill about $2,493/yr910

Who to call

Codes & inspections

Michigan LARA Bureau of Construction Codes - Statewide Jurisdiction List

The state's official table of which unit of government enforces the construction code in each Michigan community. For St. Clair County it shows 'No County Program': every city, village and township, including Riley Township, enforces its own code as 'Local' rather than through the county

Septic permits

St. Clair County Health Department - Environmental Health Division

On-site sewage (septic) construction and repair permits for St. Clair County

(810) 987-5306

Roads & driveways

St. Clair County Road Commission

Driveway approach and right-of-way permits for county roads in St. Clair County

(810) 364-5720

21 Airport Drive, St. Clair, MI 48079-1404

Online permits →

Well permits

St. Clair County Health Department - Environmental Health Division

Private water-system permits and questions about proposed or existing wells

(810) 987-5306

Planning & zoning

St. Clair County Metropolitan Planning Commission

County planning agency, by appointment; coordinates on countywide planning matters, but zoning approval and building permits are issued by your own city, village or township, not this office

(810) 989-6950

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 St. Clair County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in St. Clair County, Michigan?

Construction and changes in building use or occupancy in St. Clair County require a building-permit application to the appropriate state or local enforcing agency1. Ordinary repairs are exempt, but structural work, changes to required exits and work affecting public health or safety fall outside that exemption1. One- and two-family dwellings fall under the Michigan Residential Code; Michigan’s 2015 residential standards remain in effect while the court order described by LARA remains in place112. Riley Township separately adopted a local building code12. The enforcing agency periodically inspects permitted construction, and a new or altered building needs a Certificate of Occupancy before use1314.

Who issues building permits in St. Clair County, and how do you reach them?

St. Clair County has no county construction-code program; Michigan’s Statewide Jurisdiction List identifies the enforcing agency, including state enforcement in the Village of Emmett2. Building permits are handled locally in Marine City15, Mussey Township16, China Township17, Cottrellville Township18. The cities of Richmond19 and Memphis20 reach into St. Clair County and also handle their own building permits. For covered septic systems on St. Clair County land, the St. Clair County Health Department remains the permitting authority4. Where LARA enforces the code, building permits can be checked and obtained online or requested by mail; LARA publishes a building-permit fee schedule, while local fees may differ2122. Michigan’s owner-builder licensing exception covers a residence built for personal use and occupancy on the owner’s property; building permits still apply7.

Does St. Clair County have zoning?

Zoning on unincorporated St. Clair County land depends on the township governing the parcel; the county’s generalized GIS zoning layer is a staff interpretation, so obtain the official map and ordinance from the local community office2324. Local zoning is confirmed in Marysville25, St. Clair26, Algonac27, Mussey Township28, China Township29, Cottrellville Township30, Ira Township31, East China Township32. The cities of Richmond33 and Memphis34 reach into St. Clair County and set their own zoning. Covered septic systems on St. Clair County land still go through the St. Clair County Health Department4. Ask the parcel’s local zoning office about setbacks, lot and dwelling size, accessory dwellings and agricultural uses; we could not confirm countywide answers for those questions.

How do septic permits work in St. Clair County?

The St. Clair County Health Department issues sewage permits for properties without public sewer; the county instructions cover residential and commercial buildings generating less than 10,000 gallons per day4. Obtain the sewage permit before installing or repairing a covered septic system6. Only 0.1% of St. Clair County’s mapped soil is rated free of severe limits for a conventional drain field, so resolve septic feasibility before committing to a house site8. We could not confirm the local septic-inspection schedule or the permitting route for larger-flow systems; ask the Environmental Health Division at (810) 987-5306 about the evaluation and approvals your project needs35.

Can you live in an RV or tiny home on your land in St. Clair County?

We could not confirm a countywide rule allowing RV or tiny-home occupancy on private land in St. Clair County. Ask the zoning office for the parcel’s township, city or village about residential use, temporary camping and minimum dwelling size; applicable land-use controls vary by community3. Michigan’s campground rules do not establish permission to live in an RV on a private parcel36. Household sanitary sewage must go to a municipal sewer or an onsite septic system, so an off-grid plan still needs an approved sewage-disposal route37.

How do you build a home in St. Clair County, step by step?

  1. Identify the parcel's township, city or village, confirm its zoning district, and ask the local zoning office whether the proposed use and site plan comply23.
  2. Use the Statewide Jurisdiction List to find the correct building-code agency; do not apply to the county, which has no code program2.
  3. Submit the building-permit application and required construction documents to that enforcing agency before construction138.
  4. If public sewer is unavailable, obtain the county Health Department's sewage permit before installing or repairing septic6.
  5. Submit the private-well application, site plan and fee to the county Health Department before well work begins5.
  6. Obtain a Road Commission permit for residential driveway work in its public right-of-way, or the applicable MDOT permit on a state highway3940.
  7. Complete required approvals and obtain a Certificate of Occupancy before moving in14.

What should you check before buying land in St. Clair County?

Access: residential work in the St. Clair County Road Commission right-of-way requires a paid driveway permit and a pre-issuance inspection, usually within 10–14 working days; review covers sight distance, drainage and safety39. An existing driveway may also need inspection for new construction41. Water: submit a private-well application, site plan and fee before work; a residential Type III permit costs $2255. Soil erosion: the county lists a $300 residential soil-erosion and sedimentation-control permit fee, distinct from building and well fees; confirm applicability with Environmental Health42. Land division: proposed subdivision plats receive County Plat Board review under state law43. Taxes: the effective rate is about 1.2%, with a median annual bill about $2,493910.

Watch-outs

  • St. Clair County has no county construction-code program; confirm the enforcing agency and applicable residential code, including the court-order caveat and Riley Township’s separately adopted code212.
  • Zoning in St. Clair County is local, so do not carry an RV, tiny-home, setback or minimum-size answer from one municipality into another3.
  • Only 0.1% of St. Clair County's mapped soil is rated free of severe limits for a conventional septic drain field, so settle septic feasibility before pricing the build8.

Sources

  1. Building Permit Information, quoted and re-checked
  2. Statewide Jurisdiction List, quoted and re-checked
  3. Statewide Jurisdiction List, quoted and re-checked
  4. On-Site Sewage Disposal Systems, quoted and re-checked
  5. Drinking Water Wells, quoted and re-checked
  6. On-Site Sewage Disposal Systems, quoted and re-checked
  7. Frequently Asked Questions – Residential Builder, quoted and re-checked
  8. 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
  9. Effective property tax rate: Bolthole Index county data
  10. Median property tax bill: Bolthole Index county data
  11. Building Permit Information, quoted and re-checked
  12. Statewide Jurisdiction List, quoted and re-checked
  13. courts.michigan.gov (Michigan statewide rule), quoted and re-checked
  14. Certificate of Occupancy Request, quoted and re-checked
  15. Marine City: Building Permit Information (St. Clair County), quoted and re-checked
  16. Mussey Township: § 153.278 Permits (St. Clair County), quoted and re-checked
  17. China Township: Building Permit Application Instructions & Guidelines; Outline of Building Procedures and Inspection Requirements (St. Clair County), quoted and re-checked
  18. Cottrellville Township: Building Permit Information (St. Clair County), quoted and re-checked
  19. Richmond: Building (St. Clair County), quoted and re-checked
  20. Memphis: § 150.026 Building Permit Application (St. Clair County), quoted and re-checked
  21. Permits (Michigan statewide rule), quoted and re-checked
  22. Building Permit Information, quoted and re-checked
  23. St. Clair County township zoning (Riley Township) (2026 county census)
  24. Best Known Community Zoning, quoted and re-checked
  25. Marysville: City of Marysville Zoning Ordinance, Article 15 Schedule of Regulations (St. Clair County), quoted and re-checked
  26. St. Clair: City of St. Clair Code of Ordinances, Appendix B, § 4.4 (St. Clair County), quoted and re-checked
  27. Algonac: Algonac Code, Chapter 50 Zoning, Sec. 50-3 Definitions (St. Clair County), quoted and re-checked
  28. Mussey Township: official source (St. Clair County), quoted and re-checked
  29. China Township: Building and Zoning - China Township (St. Clair County), quoted and re-checked
  30. Cottrellville Township: Building & Zoning – Cottrellville Township (St. Clair County), quoted and re-checked
  31. Ira Township: Ira Township Building and Assessing (St. Clair County), quoted and re-checked
  32. East China Township: Chapter 480 Zoning (St. Clair County), quoted and re-checked
  33. Richmond: Richmond Code of Ordinances, Appendix A, Sec. 8.101 (St. Clair County), quoted and re-checked
  34. Memphis: official source (St. Clair County), quoted and re-checked
  35. St. Clair County Health Department - Environmental Health Division (stclaircounty.org)
  36. Legislation governing campgrounds in Michigan (Michigan statewide rule), quoted and re-checked
  37. Disposal of residential wastewater such as swimming pool water (Michigan statewide rule), quoted and re-checked
  38. Building Permit Information, quoted and re-checked
  39. Permit Requirements & Applications – St. Clair County Road Commission, quoted and re-checked
  40. Infrastructure permits – Michigan Department of Transportation, quoted and re-checked
  41. Permit Requirements & Applications – St. Clair County Road Commission, quoted and re-checked
  42. Drinking Water Wells, quoted and re-checked
  43. Plat Board, 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.

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Compared with neighboring counties

Like all 6 of its neighbors, St. Clair County requires a building permit for a home.

RuleSt. Clair CountyMacomb CountyLapeer CountySanilac CountyOakland CountyWayne CountyGenesee County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningYesYesNoNoNoYesYes
Septic permitsCounty Health Dept.County Health Dept.County Health Dept.County Health Dept.County Health Div.County Health Dept.County Health Dept.

County locator

St. Clair County in Michigan

65
County map
St. Clair County highlighted among the Michigan counties · colored by Index score

How St. Clair County scores

Seclusion32100% ev.
Self-Sufficiency67100% ev.
Admin Boringness4490% ev.
Durability87100% ev.
Property Autonomy77100% ev.
Carry Cost73100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$264kTypical home
1.2%Property tax
$5,814Land / acre
33.9"Annual rain
1.4% of yrsSevere drought
1.5 / yr (+1.5)Mid-century 100°F days
10.9 daysMid-century dry spell
1.48" (+8%)Mid-century 1-day rain
1.6×Wildfire change factor
100%Forward climate coverage
$1,351Home insurance / yr
-0.5% / yrInsurance growth
1.34%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
70,107People within 30 min
5,732,514People within 2 hr
133,524Radius comparison (15 mi)
221.6People / sq mi
0%Federal land
99.1%Land at 15% slope or less
0.1%Soils rated "not limited" for septic (strict USDA rating)
449 acWorkable land screen
37.8%Wooded land
43.4 tonsBiomass / forest ac
48.6°FAvg temp

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Cities and towns in St. Clair County

Inside a city, town or township here, that government usually sets zoning and may issue its own building permits; the county’s rules above cover land outside them.

Not yet researched: Berlin Township · Brockway Township · Village of Capac · Casco Township · Clay Township · Clyde Township · Columbus Township · Emmett Township · Village of Emmett · Fort Gratiot Township · Grant Township · Greenwood Township · Kenockee Township · Kimball Township · Lynn Township · Port Huron Township · Port Huron · Riley Township · St. Clair Township · Wales Township · Yale

Answers from the rulebook for St. Clair County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

St. Clair County rules

  • Local zoningVaries (with conditions)

    Zoning across St. Clair County, aggregated from zoning administered by individual local communities rather than a single countywide zoning ordinance.

    • Applicable zoning controls vary by local community and parcel.
    • The county GIS layer is a County Staff interpretation and should not be considered official; the county directs users to the individual community offices for official maps and documents.
    • The GIS layer is generalized and may categorize areas based on map titles or land use.
    “To display each individual community as a generalized map; this area may have been categorized based on map titles or land use.”
    One more reviewed finding on this topic
    • Varies (with conditions) — The conclusion aggregates zoning administered by St. Clair County local units, including cities, villages, and townships; it does not claim that the county administers each local ordinance.
      “The location was harvested from a printed {Vector.GISLOADER.LUT_MPC_COMMUNITY.Zng_BaseMap} map and should not be considered as "official." Please go to {Vector.GISLOADER.MPC_CompositeZone.LUNAME} offices and ask to see the "Official" map and documents before making any site decisions.  To display each individual community as a generalized map; this area may have been categorized based on map titles or land use.”
  • Who permits septicCounty

    On-site sewage disposal systems in St. Clair County for buildings not served by public sewers.

    • The St. Clair County Health Department issues the sewage permit.
    • The cited page covers residential and commercial buildings generating less than 10,000 gallons of sewage per day.

    maximum sewage generation: < 10000 gallons per day (The cited page does not establish authority for buildings generating 10,000 gallons per day or more.)

    “a sewage permit must be obtained from the Health Department.”
    2 more reviewed findings on this topic
    • County — On-site sewage permitting for St. Clair County properties not served by public sewers.
      “Prior to installing or repairing a septic system, a sewage permit must be obtained from the Health Department. Instructions and applications are available for both residential and commercial buildings that generate less than 10,000 gallons of sewage per day.”
    • County (with conditions) — On-site sewage disposal systems in St. Clair County that are not served by public sewers.
      “Prior to installing or repairing a septic system, a sewage permit must be obtained from the Health Department. Instructions and applications are available for both residential and commercial buildings that generate less than 10,000 gallons of sewage per day.”
  • Septic permitRequired

    Installation or repair of residential and commercial septic systems generating less than 10,000 gallons of sewage per day.

    • A sewage permit must be obtained before installation or repair.
    • The cited county page does not state the rule for buildings generating 10,000 gallons per day or more.

    maximum sewage generation: < 10000 gallons per day (Commercial and residential applications cited only below this threshold.)

    “Prior to installing or repairing a septic system, a sewage permit must be obtained”
    3 more reviewed findings on this topic
    • Required — Installing or repairing septic systems in St. Clair County for covered residential and commercial buildings.
      “Prior to installing or repairing a septic system, a sewage permit must be obtained from the Health Department. Instructions and applications are available for both residential and commercial buildings that generate less than 10,000 gallons of sewage per day.”
    • Required — Installing or repairing septic systems in St. Clair County.
      “Prior to installing or repairing a septic system, a sewage permit must be obtained from the Health Department. Instructions and applications are available for both residential and commercial buildings that generate less than 10,000 gallons of sewage per day.”
    • Required — Installing or repairing septic systems in St. Clair County.
      “Prior to installing or repairing a septic system, a sewage permit must be obtained from the Health Department.”
  • Well permitRequired

    Residential and commercial Type III wells administered through the St. Clair County Health Department.

    • The application includes site-review, isolation-distance, installation-notification, permit-issuance, and permit-expiration fields.
    • The well owner is responsible for proper abandonment and documentation when an existing well is abandoned.

    surface-water isolation distance: 10 feet · septic-system isolation distance: 50 feet · animal/poultry-yard isolation distance: 50 feet

    “Well permits are valid for one year only and should not be applied for until water well installation is about to be done in that 12 month period. This permit is not transferable to another person or property.”
    2 more reviewed findings on this topic
    • Required — Constructing, developing, or installing a private water system in St. Clair County.
      “Any property owner intending to construct, develop, or install a private water system must submit an application and permit to the Health Department prior to the start of work.”
    • Required — Construction, development, or installation of a private water system in St. Clair County.
      “must submit an application and permit to the Health Department prior to the start of work.”
  • Subdividing landRegulated (with conditions)

    Proposed subdivision plats in St. Clair County.

    • The County Plat Board reviews proposed subdivision plats in accordance with state law.
    • The cited page identifies the Land Division Act and Subdivision Control Act as governing authorities.
    • Approval procedures and local-government responsibilities apply.
    “The County Plat Board meets as necessary to review proposed subdivision plats in accordance with State law. The Board’s primary task is to receive plat proposals, review those plats to ensure they comply with the Land Division Act (PA 288 of 1967 and PA 591 of 1996), and certify compliance.”
  • Driveway accessRequired

    Commercial driveways serving business operations and connecting to or involving the St. Clair County Road Commission public right-of-way in St. Clair County, Michigan.

    • A permit fee is required; the applicable amount is determined by the Road Commission permit fee schedule.
    • A Certificate of Liability or Continuous Surety Bond is required; the permit-fee page specifies a $5,000 surety bond for a commercial drive approach on a gravel road and a $10,000 surety bond on an asphalt road.
    • Three sets of engineered plans are required, including grades, elevations, cross-sections, profiles, details, specifications, and materials for construction and restoration of the right-of-way.
    • Bonds or letters of credit are released only after the project has been completed, inspected, and approved.
    • No construction work may begin in the public right-of-way until the plans have been approved and the necessary permits have been issued by the St. Clair County Road Commission.

    commercial drive approach surety bond on gravel road: 5000 USD · commercial drive approach surety bond on asphalt road: 10000 USD · engineered plan sets: 3 sets

    “To construct a commercial driveway (for the purpose of business operation), the following is required at time of application: 1. Permit fee”
    2 more reviewed findings on this topic
    • Required — Residential driveway work within the public right-of-way under the jurisdiction of the St. Clair County Road Commission, including inspection of existing driveways for new construction.
      “A permit is required to construct, operate, use and/or maintain all work within the public right-of-way (please contact our office to obtain specific right-of-way information). This would include inspecting existing driveway(s) for new construction.”
    • Required — Residential driveway installation, operation, use, maintenance, or related work within the St. Clair County Road Commission public right-of-way in St. Clair County, Michigan.
      “Yes, a permit from the Road Commission is required anytime work is performed in County road right of way.”
  • Permit feesPublished (with conditions)

    St. Clair County Health Department environmental-health permits, including private water systems and soil-erosion permits.

    • The cited fees are program-specific and do not establish fees for every building or land-use permit.
    • Well fees are $225 for residential Type III and $400 for commercial Type II.
    • The SESC page lists $300 residential and $525 commercial, with possible additional-acre fees.

    residential Type III well permit fee: 225 USD · commercial Type II well permit fee: 400 USD · SESC residential permit fee: 300 USD · SESC commercial permit fee: 525 USD (fees may apply per additional acre)

    “SESC Residential Permit: $300.00 SESC Commercial Permit: $525.00 (fees may apply per additional acre)”
  • County-wide zoningPresent

    Zoning applies within the county but is administered at the township level under the Michigan Zoning Enabling Act (e.g., Riley Township zoning ordinance governs its unincorporated area).

    St. Clair County township zoning (Riley Township) ↗Scouted from the county site, not yet independently re-checked

Michigan rules that apply here

  • Building permitRequired

    Construction of a building or structure in Michigan, subject to exceptions in the Michigan construction code.

    • The owner, or the owner's builder, architect, engineer, or agent, must submit a written application to the appropriate enforcing agency before construction.
    • The application must use the commission-prescribed form, include the established enforcing-agency fee, contain a detailed affidavit-verified statement of specifications, include complete scaled plans, and include a site plan showing dimensions and locations of proposed and existing buildings or structures on the premises.
    • The act states 'Except as otherwise provided in the code'; specific exemptions require separate verification.
    “Except as otherwise provided in the code, before construction of a building or structure, the owner, or the owner's builder, architect, engineer, or agent, shall submit an application in writing to the appropriate enforcing agency for a building permit.”
    3 more reviewed findings on this topic
    • Required — Construction of buildings or structures and changes in use or occupancy in St. Clair County.
      “Before construction of a building or structure, an owner, or the owner's builder, architect, engineer, or agent, shall submit an application in writing to the appropriate enforcing agency for a building permit. A permit is also required when the use or occupancy of a structure or portion thereof is changed.”
    • Required — Construction of a building or structure, and changes in use or occupancy, in St. Clair County through the appropriate enforcing agency.
      “Before construction of a building or structure, an owner, or the owner's builder, architect, engineer, or agent, shall submit an application in writing to the appropriate enforcing agency for a building permit. A permit is also required when the use or occupancy of a structure or portion thereof is changed.”
    • Required — Construction or a change in use or occupancy of a building or structure in St. Clair County, with the application submitted to the appropriate enforcing agency.
      “A permit is also required when the use or occupancy of a structure or portion thereof is changed.”
  • Owner-builder exemptionAvailable (with conditions)

    Michigan residential-builder licensing for a person erecting a residential structure for the person's own use and occupancy on the person's property, including St. Clair County.

    • The exemption concerns the residential-builder licensing definition; it does not eliminate the separate building-permit requirement.
    • The state source states the exception applies when the person erects the residential structure for the person's own use and occupancy on the person's property.
    • Other licensing-law exceptions and applicable local requirements may apply.
    “person who erects a residential structure or combination residential and commercial structure except for the person's own use and occupancy on the person's property.”
    2 more reviewed findings on this topic
    • Available (with conditions) — Michigan residential-builder licensing: a person erecting a residential structure for the person's own use and occupancy on the person's property is outside the cited residential-builder definition.
      “or a person who erects a residential structure or combination residential and commercial structure except for the person's own use and occupancy on the person's property.”
    • Available (with conditions) — Michigan residential-builder licensing when an individual erects a residential structure or combination residential and commercial structure for the individual's own use and occupancy on the individual's property.
      “or a person who erects a residential structure or combination residential and commercial structure except for the person's own use and occupancy on the person's property.”
  • Building code adoptedAdopted (with conditions)

    Construction, alteration, relocation, demolition, use, and occupancy of buildings and structures statewide in Michigan, including residential requirements administered under the Michigan Residential Code.

    • The current Michigan Building Code is the 2021 edition and is effective April 9, 2025.
    • The rule adopts the International Building Code by reference with Michigan amendments and exceptions.
    • The adopted rule excludes sections 104.2, 104.3, 104.8, 104.8.1, 104.10, 105.3, 105.3.1, 105.3.2, 105.6, 109.2 to 109.6, 111.2, 111.3, 113.2, 113.3, 113.4, 114.1, 114.2, 114.3, 114.4, 115.1 to 115.4, 423.5, 423.5.1, 423.5.2, 903.2.8.4, 2902 to 2902.6, Table 2902.1, section 3005.5, the definition of agricultural building in section 202, and the definition of recreational vehicle in Appendix G.
    • The rule also incorporates IECC 2021, IEBC 2021, IMC 2021, IPC 2021, IPSDC 2021, and NFPA 70 2023 as listed in chapter 35.
    • Residential requirements are contained in the Michigan Residential Code.
    • The code may be purchased from the International Code Council through the bureau website at a cost of $144.00 as of the time of adoption of the amendatory rules.

    building code edition: 2021 Michigan Building Code (Michigan amendments and listed exceptions apply) · effective date: 2025-04-09

    “The provisions of the international building code, 2021 edition, including appendices F, G, and H, except for [...] govern the construction, alteration, relocation, demolition, use, and occupancy of buildings and structures, and, with exceptions noted, the international building code is adopted by reference in these rules.”
    4 more reviewed findings on this topic
    • Adopted (with conditions) — Michigan construction codes applicable in St. Clair County through the appropriate enforcing agency.
      “2021 Michigan Building Code -Current Code-Effective April 9, 2025”
    • Adopted (with conditions) — Michigan Building Code and Michigan Residential Code applicable to construction in St. Clair County through the appropriate enforcing agency.
      “The Michigan Building Code controls all matters concerning the construction, alteration, addition, repair, removal, demolition, use, location, occupancy, and maintenance of all buildings and structures and their service equipment. Presently, provisions for one- and two-family dwellings are included in the Michigan Residential Code.”
    • Partial — Michigan construction-code administration affecting St. Clair County.
      “The Township of Riley does hereby adopt by reference the BOCA National Building Code, Thirteenth Edition, 1996, as amended, as the Building Code of Riley Township, and the International Property Maintenance Code, 2021 Edition, as amended, as the Maintenance Code.”
    • Partial — Construction in St. Clair County subject to Michigan construction codes and the applicable enforcing agency.
      “the 2015 versions of the IRC and residential provisions of the IECC standards [...] will remain valid and in effect.”
  • InspectionsRequired

    All construction undertaken pursuant to a building permit issued by an enforcing agency in Michigan.

    • The enforcing agency must periodically inspect the permitted construction.
    • Inspections are to ensure that construction complies with building-permit conditions, the code, and other applicable laws and ordinances.
    • The cited rule concerns construction undertaken pursuant to a building permit issued by the enforcing agency; it does not establish an inspection requirement for work exempt from permitting.
    • Inspection administration may be performed by the state or by a local enforcing agency according to the applicable jurisdictional assignment.

    inspection frequency: periodic

    “An enforcing agency shall periodically inspect all construction undertaken pursuant to a building permit issued by it to insure that the construction is performed in”
    One more reviewed finding on this topic
    • Required — All construction undertaken pursuant to a building permit issued by a Michigan enforcing agency.
      “An enforcing agency shall periodically inspect all construction undertaken pursuant to a building permit issued by it to insure that the construction is performed in accordance with conditions of the building permit and is consistent with requirements of the code and other applicable laws and ordinances.”
  • Certificate of occupancyRequired

    A new building or altered building subject to the Michigan construction code.

    • The building or altered building may not be used or occupied until the code official issues a Certificate of Occupancy.
    • The permit holder or authorized agent must submit a written request after project completion.
    • The request must include applicable building, electrical, mechanical, plumbing, boiler, elevator, plan-review, and school fire-services project numbers.
    • The certificate cannot be issued until all fees are paid, permits are finaled, and permitted work is completed in accordance with the permit, code, and applicable laws and ordinances.
    • If an electrical, mechanical, plumbing, boiler, elevator, plan-review, or Fire Services project is not required, the request must state “not applicable.”
    “A new building or a building that is altered shall not be used or occupied until a Certificate of Occupancy is issued by the code official.”
    One more reviewed finding on this topic
    • Required — New or altered buildings in St. Clair County subject to the Michigan construction code.
      “A new building or a building that is altered shall not be used or occupied until a Certificate of Occupancy is issued by the code official.”
  • Zoning districtsPartial

    Michigan's statutory zoning framework for counties, townships, cities, and villages; this does not identify the actual zoning districts adopted by each local government.

    • Actual zoning districts and district regulations are local and must be checked in the applicable county, township, city, or village ordinance.
    • The cited act's stated effective date is July 1, 2006.
    “to provide for the establishment in counties, townships, cities, and villages of zoning districts;”
  • Off-grid sanitationLimited

    Residential sanitary sewage disposal in Michigan without connection to a municipal sanitary sewer.

    • Sanitary sewage from toilets, sinks, showers, washing machines, and dishwashers must be directed to a municipal sanitary sewer or an onsite septic system.
    • An onsite septic system is subject to the EGLE-coordinated permitting and local-health-department permitting and inspection framework.
    • The source does not establish a statewide authorization for untreated discharge or arbitrary off-grid sanitation methods.
    “All sanitary sewage [...] must be directed to municipal sanitary sewer or to an onsite septic system.”
  • Mandatory utility hookupConditional

    Buildings and premises in Michigan that have plumbing fixtures or drainage piping.

    • Connection must be to a public sewer where available, or otherwise to an approved private sewage disposal system.
    • Plumbing work cannot begin until the appropriate enforcing agency issues a permit.
    • Local requirements may apply to water service and building sewer installation.
    “Every building in which plumbing fixtures are installed [...] shall be connected to a public sewer, where available, or an approved private sewage disposal system.”
  • Agricultural exemptionConditional

    Building-permit exemption for shade cloth structures constructed for nursery or agricultural purposes under Michigan Building Code Part 4.

    • The exemption applies to shade cloth structures constructed for nursery or agricultural purposes.
    • Service systems are excluded from the exemption.
    • The exemption does not authorize work violating the building code or other laws or ordinances of the jurisdiction.
    “Exemptions from permit requirements of the code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of the code or any other laws or ordinances of this jurisdiction. Permits shall not be required for any of the following: [...] (x) Shade cloth structures constructed for nursery or agricultural purposes, not including service systems.”
  • Building in a floodplainRequired

    Alteration or occupation of the 100-year floodplain of a Michigan river, stream, or drain regulated under Part 31.

    • The Part 31 permit requirement applies to rivers, streams, or drains with a drainage area of 2 square miles or greater.
    • A Part 31 EGLE permit is not required for alterations within floodplains of the Great Lakes, inland lakes, or watercourses with drainage areas less than 2 square miles, although other NREPA reviews may still be necessary.
    • Construction and fill may be permitted in non-floodway portions if local ordinances and building standards are met and compensating excavation is provided equal to the volume of fill placed in the floodplain.
    • New residential construction is specifically prohibited in the floodway.
    • The minimum residential elevation standard is one foot above the 100-year flood elevation, and some communities or counties may impose a higher standard.

    Minimum drainage area for Part 31 floodplain authority: >= 2 square miles (Part 31 does not apply below this threshold) · Lowest-floor elevation: >= 1 foot above 100-year flood elevation (Some communities and counties may require a higher elevation)

    “The Floodplain Regulatory Authority deals with the floodplains of rivers, streams, or drains which have a drainage area that is 2 square miles or greater. A permit is not required from EGLE, under Part 31, for alterations within the floodplains of the Great Lakes, inland lakes, or watercourses which have a drainage area less than 2 square miles.”
  • Permit processPublished (with conditions)

    Building-permit application process where the state is the enforcing agency, and guidance for identifying the appropriate agency in St. Clair County.

    • Applicants should review the Statewide Jurisdiction List because enforcement may be by the state, county, or local unit.
    • Applications may be submitted online or by mail; mail may cause delays.
    • Construction documents are generally required, subject to stated exceptions.
    “A set of construction documents is required with each application for a permit. The submission of construction documents may be waived by the building official when code compliance can be determined based on the description in the application.”
    One more reviewed finding on this topic
    • Published — Michigan Bureau of Construction Codes boiler, building, electrical, elevator, mechanical, and plumbing permit processing.
      “The Inspections Division is responsible for issuing boiler, building, electrical, elevator, mechanical, and plumbing permits. Permits can be checked and obtained expeditiously online at: https://aca-prod.accela.com/lara/ . Additionally, permits can be obtained via mail; however, applying by mail may cause delays in the applications process.”
  • Campground & park staysLimited

    Tiny houses, including tiny houses built on wheels, proposed as resort cabins or similar occupancy in Michigan.

    • The source distinguishes tiny houses from recreational units and states they cannot be treated as recreational units even if built on wheels.
    • The tiny house must be built as a resort rather than a campground.
    • Local health department permitting for wells, septic tanks, and drainfields is required as applicable.
    • Local zoning, building, electrical, and plumbing permits and final approvals are required under local authorities.
    • The source does not establish statewide zoning permission or a statewide right to occupy a tiny house.
    “Local zoning, building, electrical, plumbing permits and final approvals under local authorities.”
    3 more reviewed findings on this topic
    • Limited — RV occupancy as part of a Michigan campground consisting of five or more recreational units used for temporary living quarters.
      “requires a campground license when five or more recreational units (i.e., tents, campers, RVs) are placed on a parcel or tract of land”
    • Limited — Temporary camping in a Michigan temporary campground.
      “A temporary campground license issued by the local health department (LHD) having jurisdiction is required prior to operating a temporary campground.”
    • Limited — Occupancy of RVs and other recreational units as temporary living quarters in a Michigan campground offering sites to the public or members of an organization, where 5 or more recreational units are involved.
      “A campground owner shall ensure that a site is occupied by not more than 8 persons and by not more than 1 recreational unit.”
  • county building authorityGeneral

    Michigan counties serving as building-code enforcing agencies for residential construction in unincorporated areas, subject to the Statewide Jurisdiction List and local/state jurisdiction assignments.

    • Before construction, a written building-permit application must be submitted to the appropriate enforcing agency.
    • A permit is also required when use or occupancy changes.
    • Ordinary repairs do not require a permit, but the stated structural, egress, plumbing, electrical, mechanical, and public-health/safety limitations apply.
    • The Michigan Building Code and Michigan Residential Code govern construction; county enforcement applies only where the Statewide Jurisdiction List designates county jurisdiction.
    “If COUNTY is indicated, that unit of government receives code enforcement services from a county enforcing agency.”

Set by your township or city, not the county

In Michigan, zoning is adopted by each township or city, so St. Clair County has no county-wide answer on these. Find your township or city in the list of places on this page, or call its clerk or zoning administrator.

  • Minimum dwelling size
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Short-term rentals

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Septic inspection — Inspection requirements for septic systems in St. Clair County.

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.

Living off-grid in St. Clair County, Michigan

Is St. Clair County a good place to live off-grid or homestead?

St. Clair County scores 65/100 on the Bolthole Index, a strong county profile. Its strengths: a durable current and mid-century hazard profile and a stronger property-autonomy legal backdrop. Watch-outs: about 70,107 people within a 30-minute drive.

Do you need a building permit in St. Clair County, Michigan?

St. Clair County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by St. Clair County Health Department, Environmental Health Division. Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in St. Clair County, Michigan?

Land in St. Clair County runs about $5,814 per acre, based on the latest county data.

What is the water situation in St. Clair County?

St. Clair County gets about 33.9" of rain a year, with severe drought in roughly 1.4% of years.

How remote is St. Clair County?

A representative private-land location has about 70,107 people within a 30-minute drive and 5,732,514 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How St. Clair compares in Michigan

Compare side-by-side →See all 83 Michigan counties ranked →