Sanilac County, MI: No Zoning, Owner-Builder Allowed

Unincorporated Sanilac County, Michigan requires building permits before construction and periodic inspections for county-issued building permits^1,2. Zoning approval comes from the applicable township, city or village, while the Sanilac County Health Department reviews septic needs when bathrooms or bedrooms are added². Covered new and replacement water wells require a Health Department permit before installation³.

At a glance

Building permit: Required before construction through the Sanilac County Construction and Land Use Department¹
Inspections: Periodic inspections are required for every county building permit²
Zoning: Approval comes from the applicable township, city or village and rules vary by municipality²
Septic and wells: Health Department septic review when bathrooms or bedrooms are added; permits before installation of covered new and replacement wells^2,3
RV living: Not confirmed countywide; ask the zoning administrator for the township, city or village covering the parcel²
Tiny home: Local zoning and construction approvals apply; wheels do not create automatic approval⁴
Owner-builder: State licensing allows an owner to build for the owner's own use and occupancy; county trade permits are limited to work the homeowner personally performs^2,5

Who to call

Building permits

Sanilac County Construction and Land Use Department

Building, electrical, plumbing and mechanical permit applications and inspections in Sanilac County

(810)648-4664

60 West Sanilac, Courthouse Annex-Room 210, Sandusky, Michigan 48471

Online permits →

Septic permits

Sanilac County Health Department — Environmental Health Division

Septic and well permits, soil evaluations, and related environmental health applications

(810) 648-4098 ext. 124

eh@sanilachealth.com

171 Dawson Street Ste. 123, Sandusky, MI 48471

Online permits →

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

Do you need a building permit in Sanilac County, Michigan?

Yes.

Yes. Unincorporated Sanilac County requires a building permit before construction and when a structure's use or occupancy changes¹. Ordinary repairs are exempt only when they do not include structural changes, changes to required exits, or work affecting public health or safety¹. Michigan's construction-code system applies in Sanilac County, with residential requirements in the Michigan Residential Code¹. Every building permit administered by the county requires periodic inspections². A new or altered building may not be used or occupied until the code official issues a Certificate of Occupancy⁶. Inside Deckerville, the village ordinance also assigns building permits to the county, after village zoning compliance approval⁷. Septic review remains with the Sanilac County Health Department when bathrooms or bedrooms are added².

Who is the Sanilac County building department, and how do you reach it?

The Sanilac County Construction and Land Use Department accepts building, electrical, plumbing and mechanical permit applications at 60 West Sanilac, Courthouse Annex-Room 210, Sandusky, Michigan 48471². Applications are accepted from 8:00 a.m. to 4:30 p.m. on weekdays other than legal holidays, and inspections can be scheduled at (810)648-4664². A site sign and building-corner stakes are required before the site inspection and building-permit issuance². The permit holder schedules inspections; most are completed within 3 business days, or up to 5 during busy periods². County building permits do not replace zoning approval from the city, village or township covering the parcel; septic and well review for projects adding bathrooms or bedrooms remains with the Sanilac County Health Department². The county may cancel a building permit if work has not begun and no inspection other than the site inspection occurs within 6 months, or if a started project stops for more than 6 months².

Does Sanilac County have zoning?

For unincorporated Sanilac County, obtain zoning approval from the township zoning administrator before applying for the county building permit; local requirements vary.

For unincorporated Sanilac County, obtain zoning approval from the township zoning administrator before applying for the county building permit; local requirements vary². Croswell, Lexington village and Deckerville have their own zoning rules^8,9,10. Septic review for projects adding bathrooms or bedrooms and permits for covered new or replacement wells remain with the Sanilac County Health Department^2,3. We could not confirm countywide setbacks, minimum lot or dwelling sizes, accessory-dwelling rules or RV occupancy standards; ask the zoning administrator covering the parcel. Lexington requires a zoning permit before construction, and Deckerville requires zoning compliance approval before the county building permit^7,9.

How do septic and well permits work in Sanilac County?

The Sanilac County Health Department reviews existing sanitary facilities or septic-permit needs when a construction project includes bathrooms or adds bedrooms.

The Sanilac County Health Department reviews existing sanitary facilities or septic-permit needs when a construction project includes bathrooms or adds bedrooms². We could not confirm a universal septic-permit rule or septic-inspection timing; ask Environmental Health at (810) 648-4098 ext. 124 or eh@sanilachealth.com¹¹. Covered new and replacement residential, hauled-water, irrigation, Type II and Type III wells require a Health Department permit before installation; submitting an application does not authorize drilling³. Installing a covered well before permit issuance triggers a fee of 3 times the basic permit fee³. About 12% of county soils are rated without severe limitations for a conventional drain field, so arrange a parcel-specific soil evaluation before fixing the house location¹².

Can you live in an RV or tiny home on your land in Sanilac County?

We could not confirm a countywide rule allowing long-term RV living or temporary camping on private land in Sanilac County.

We could not confirm a countywide rule allowing long-term RV living or temporary camping on private land in Sanilac County. Ask the city, village or township zoning administrator responsible for the parcel, because the county building-permit process requires that local zoning approval². Michigan guidance does not treat a tiny house as a recreational unit merely because the house is built on wheels; the cited resort guidance requires local zoning, building, electrical and plumbing approvals, plus applicable well and septic permits⁴. That state guidance does not create a general right to occupy a tiny house or RV on a private rural parcel⁴. An owner may qualify for Michigan's residential-builder licensing exemption when building a residence for the owner's own use and occupancy⁵. For county mechanical, plumbing and electrical permits, the homeowner may apply only for work personally performed on the homeowner's own single-family dwelling; a hired contractor must obtain the permit².

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

Identify the city, village or township covering the parcel and obtain zoning approval from its zoning administrator.

Identify the city, village or township covering the parcel and obtain zoning approval from its zoning administrator².

Ask the Sanilac County Health Department to review existing septic and well facilities or the need for septic and well permits when the home adds bathrooms or bedrooms². Obtain a Health Department permit before installing a covered new or replacement well³.

Check floodplain status: construction, fill or alteration in a river, stream or drain floodplain with a drainage area of at least 2 square miles requires a state floodplain permit; new homes are prohibited in the floodway¹³.

Obtain a driveway permit from the city, village, county or state authority controlling the road right-of-way if access is new or its use will change².

Apply to the Sanilac County Construction and Land Use Department for the building permit and any required electrical, plumbing or mechanical permits².

Schedule periodic building inspections and obtain the Certificate of Occupancy before using the completed home^2,6.

What should you check before buying land in Sanilac County?

Confirm the parcel's city, village or township and ask its zoning administrator for the allowed use, setbacks, dwelling standards and RV restrictions.

Confirm the parcel's city, village or township and ask its zoning administrator for the allowed use, setbacks, dwelling standards and RV restrictions². Arrange a soil evaluation before assuming a conventional drain field will work, because about 12% of county soils are rated without severe limitations for that use¹². Check floodplain and floodway status before choosing a homesite: new residential construction is prohibited in the floodway¹³. Verify who controls the frontage road, because that authority issues the driveway permit when access is new or its use changes². Recent parcel splits require advance county approval, and final subdivision plats undergo state compliance review before recording^2,14. The effective property-tax rate is about 0.9%, with a median annual bill of about $1,488¹².

Watch-outs

Local zoning approval and county building permits are separate; the Sanilac County Health Department handles septic review when bathrooms or bedrooms are added and permits for covered new or replacement wells^2,3.
Only about 12% of Sanilac County soils are rated without severe limitations for a conventional septic drain field, so a parcel-specific soil evaluation belongs early in due diligence¹².
A state floodplain permit is required for construction, fill or alteration in a river, stream or drain floodplain with a drainage area of at least 2 square miles; new residential construction is prohibited in the floodway¹³.
New or changed driveway access needs a driveway permit from the city, village, county or state authority controlling the road right-of-way².

Sources

14 official pages, each quoted and re-checked · written October 12, 2026

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.

Off-grid gear

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

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Compared with neighboring counties

Unlike 5 of its 6 neighbors, Sanilac County has no countywide zoning.

Rule	Sanilac County	Tuscola County	Lapeer County	Huron County	St. Clair County	Macomb County	Genesee County
Building permit	Required	Required	Required	Required	Required	Required	Required
County zoning	No	Yes	No	Yes	Yes	Yes	Yes
Septic permits	County Health Dept.	County Health Dept.	County Health Dept.	County Health Dept.	County Health Dept.	County Health Dept.	County Health Dept.

Answers from the rulebook for Sanilac County

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

Sanilac County rules

Owner-builder exemptionConditional
Owner applications for mechanical, plumbing, and electrical permits for the owner's own single-family dwelling
- The homeowner must actually perform the work.
- A homeowner may not obtain the permit if hiring a contractor.
- The cited page does not establish the same condition for a general building permit.
“A homeowner that is going to do the work themselves on their own single family dwelling. A homeowner may not take out a permit if they hire a contractor.”
sanilaccounty.gov ↗Re-checked Sep 30, 2026
One more reviewed finding on this topic
- Available (with conditions) — A homeowner applying for a mechanical, plumbing, or electrical permit for work the homeowner will personally perform on the homeowner's own single-family dwelling.
  “A homeowner that is going to do the work themselves on their own single family dwelling. A homeowner may not take out a permit if they hire a contractor.”
  sanilaccounty.gov ↗Re-checked Sep 29, 2026
InspectionsRequired
Building permits administered by the Sanilac County Construction Code Department.
- All building permits require periodic inspections.
- If a project is not started and no inspection occurs within six months, excluding the site inspection, the permit may be cancelled.
- If a started project is stopped for more than six months, the permit may be cancelled.
- Concealed equipment must be inspected and approved before concealment.
- Equipment must receive final inspection and approval before normal operation.
- Replacement equipment is excepted, but a permit application and inspection request must be made within two days after installation or before concealment.
inspection initiation deadline: 6 months (site inspection excluded) · replacement-equipment permit and inspection request: <= 2 days (after installation or before concealment)
“All building permits are required to have periodic inspections. If the project is not started and you do not have an inspection within six (6) months (this does not include the site inspection) your permit may be cancelled.”
sanilaccounty.gov ↗Re-checked Sep 29, 2026
2 more reviewed findings on this topic
- Required — Projects issued building permits by Sanilac County
  “All building permits are required to have periodic inspections. If the project is not started and you do not have an inspection within six (6) months (this does not include the site inspection) your permit may be cancelled.”
  sanilaccounty.gov ↗Re-checked Sep 30, 2026
- Required — Building permits administered by the Sanilac County Construction Code Department.
  “All building permits are required to have periodic inspections. If the project is not started and you do not have an inspection within six (6) months (this does not include the site inspection) your permit may be cancelled.”
  sanilaccounty.gov ↗Re-checked Sep 29, 2026
Local zoningVaries (with conditions)
Zoning approval for building permits in Sanilac County, administered by each city, village or township rather than by the county Construction Code Department
- The county page does not say which townships, cities or villages have adopted zoning.
- Zoning approval is a prerequisite to the county building permit application.
- This aggregates local zoning; the county does not administer each local ordinance.
- Septic/well review by the Sanilac County Health Department applies for new bathrooms or added bedrooms.
- The page also mentions a 'sanilac county land development code' (article 14.28, private roads), which was not located.
“zoning approval is required from your city, village or township zoning administrator.”
Sanilac County Construction and Land Use - Procedures and Instructions ↗Re-checked Nov 12, 2026
2 more reviewed findings on this topic
- Varies (with conditions) — Aggregate of local zoning administration by cities, villages, and townships within Sanilac County; the county page identifies these local zoning administrators rather than claiming the county administers their ordinances.
  “Zoning approval is required from your City, Village or Township Zoning Administrator.”
  sanilaccounty.gov ↗Re-checked Oct 7, 2026
- Varies (with conditions) — Aggregate local zoning requirements administered by cities, villages, and townships within Sanilac County.
  “Zoning approval is required from your City, Village or Township Zoning Administrator.”
  sanilaccounty.gov ↗Re-checked Oct 6, 2026
Who permits septicCounty (with conditions)
On-site septic and related environmental-health review in Sanilac County
- The Sanilac County Health Department reviews existing sanitary facilities and septic or well permits when sanitary facilities or bedrooms are included in a construction project.
- The Environmental Health Division implements state-mandated programs.
“Sanitarian, Type 2, On-Site Septic - Rece, Ext. 148”
sanilachealth.com ↗Re-checked Sep 30, 2026
One more reviewed finding on this topic
- County (with conditions) — On-site septic and related sanitary-facility review in Sanilac County.
  “If sanitary facilities (bathroom/s) are being included or bedrooms are being added in the construction project, a review of your existing facilities or a septic and/or well permit are to be reviewed by the Sanilac County Health Department.”
  sanilaccounty.gov ↗Re-checked Sep 29, 2026
Septic permitLimited
Construction projects adding bedrooms or sanitary facilities in Sanilac County
- A septic and/or well permit or review of existing facilities must be reviewed by the Sanilac County Health Department when bathrooms are included or bedrooms are added.
- The source does not establish a universal permit requirement for every property or every septic activity.
“If sanitary facilities (bathroom/s) are being included or bedrooms are being added in the construction project, a review of your existing facilities or a septic and/or well permit are to be reviewed by the Sanilac County Health Department.”
sanilaccounty.gov ↗Re-checked Sep 30, 2026
One more reviewed finding on this topic
- Limited — Projects adding bathrooms or bedrooms in Sanilac County.
  “If sanitary facilities (bathroom/s) are being included or bedrooms are being added in the construction project, a review of your existing facilities or a septic and/or well permit are to be reviewed by the Sanilac County Health Department.”
  Procedures and Instructions ↗Re-checked Sep 29, 2026
Well permitRequired
New and replacement residential, hauled-water, irrigation, Type II, and Type III water wells in Sanilac County covered by the Sanilac County Health Department Well Permit Application.
- A permit must be issued before installation; the application itself is not a permit.
- Installation before permit issuance results in a fee three times the basic permit fee.
- The application expires one year from the date of submittal.
- The application fee is non-refundable and payment does not guarantee permit issuance.
- A complete application requires property and applicant information, a detailed scaled site plan, legal description, and payment.
- For an existing well, the well must be brought up to current code or abandoned by an approved plugging method.
- The state source notes that Michigan county ordinances may require a permit or local-health-department notification; Sanilac County's official application specifically requires issuance of a permit before installation.
application expiration: 1 year from date of submittal · unauthorized-installation fee: 3 times the basic permit fee
“This is NOT a permit. Any installation prior to the issuance of a permit will result in a fee (3) times the basic permit fee.”
cms2.revize.com ↗Re-checked Oct 4, 2026
2 more reviewed findings on this topic
- Limited — Building projects adding sanitary facilities or bedrooms in Sanilac County
  “If sanitary facilities (bathroom/s) are being included or bedrooms are being added in the construction project, a review of your existing facilities or a septic and/or well permit are to be reviewed by the Sanilac County Health Department.”
  sanilaccounty.gov ↗Re-checked Sep 26, 2026
- Limited — Projects adding sanitary facilities or bedrooms in Sanilac County.
  “If sanitary facilities (bathroom/s) are being included or bedrooms are being added in the construction project, a review of your existing facilities or a septic and/or well permit are to be reviewed by the Sanilac County Health Department.”
  Procedures and Instructions ↗Re-checked Sep 29, 2026
Subdividing landLimited
Recent parcel splits and new lots in Sanilac County
- For a recent split, a certified recorded boundary-line survey and recorded deed or land contract are required.
- All splits must be approved in advance by the Sanilac County Equalization Department.
- New lots established after April 23, 1996 require a licensed surveyor to establish the lot boundary.
new-lot boundary stake height: 3 feet (For lots established after April 23, 1996)
“All splits must be approved IN ADVANCE by the Sanilac County Equalization Department.”
sanilaccounty.gov ↗Re-checked Sep 30, 2026
Driveway accessLimited
Changing a use or installing a new driveway in Sanilac County
- A driveway permit is required from the city, village, county, or state authority having jurisdiction over the road right-of-way.
- Private-road construction must comply with Article 14.28 of the Sanilac County Land Development Code.
“If you are changing the use or installing a new driveway, you will need a driveway permit from the city, village, county or state authority having jurisdiction over the road right of way.”
sanilaccounty.gov ↗Re-checked Sep 30, 2026
One more reviewed finding on this topic
- Required — Changing use or installing a new driveway in Sanilac County.
  “If you are changing the use or installing a new driveway, you will need a driveway permit from the city, village, county or state authority having jurisdiction over the road right of way.”
  sanilaccounty.gov ↗Re-checked Sep 29, 2026
Permit processPublished
Building, electrical, plumbing, and mechanical permit applications and inspections handled by the Sanilac County Construction Code Department.
- Applications are accepted Monday through Friday, except legal holidays, from 8:00 A.M. to 4:30 P.M.
- The permit holder must schedule inspections and provide the permit number, permit type, permit-holder name, construction address, municipality, section, and contact telephone number.
- Most inspections are completed within three business days; during unusually busy periods, up to five business days.
- A site sign and building-corner stakes are required before site inspection and building-permit issuance.
office hours: 8:00 A.M.–4:30 P.M. (Monday through Friday except legal holidays) · usual inspection completion: <= 3 business days (may be up to 5 business days during abnormally busy periods)
“This information has been produced by the Construction Code Department as a way of letting the public know what information is required, and the procedures that must be followed when making application for a permit (building, electrical, plumbing, mechanical).”
sanilaccounty.gov ↗Re-checked Sep 29, 2026
One more reviewed finding on this topic
- Published (with conditions) — Building, electrical, plumbing, and mechanical permit applications and inspections handled by the Sanilac County Construction Code Department
  “Most inspections will be completed within three (3) business days after the request is received. During abnormally busy times of the year the inspection time could be up to five (5) business days.”
  sanilaccounty.gov ↗Re-checked Sep 30, 2026
County-wide zoningAbsent
Sanilac County itself has no county-level zoning authority. The county's own Construction and Land Use procedures page states "Zoning approval is required from your City, Village or Township Zoning Administrator" before a county construction permit is issued - zoning is administered independently by each township, city, or village, not the county.
Sanilac County - Construction and Land Use, Procedures and Instructions ↗From the county’s own site, awaiting a second reviewer

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.”
Stille-DeRossett-Hale Single State Construction Code Act, MCL 125.1510 ↗Re-checked Oct 5, 2026
3 more reviewed findings on this topic
- Required — Construction of a building or structure, and changes in use or occupancy, in Sanilac County
  “Before construction of a building or structure [...] shall submit an application in writing to the appropriate enforcing agency for a building permit.”
  Building Permit Information ↗Re-checked Sep 26, 2026
- Required — Construction of buildings or structures and changes in use or occupancy in Sanilac County under the Michigan construction code.
  “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.”
  Building Permit Information ↗Re-checked Sep 29, 2026
- Required — Construction of a building or structure and changes in use or occupancy in Sanilac 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.”
  Building Permit Information ↗Re-checked Sep 29, 2026
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.”
Code Books ↗Re-checked Sep 11, 2026
3 more reviewed findings on this topic
- Adopted — Michigan construction-code system applicable in Sanilac County
  “2021 Michigan Building Code -Current Code-Effective April 9, 2025”
  Code Books ↗Re-checked Sep 26, 2026
- Adopted — Building construction, alteration, addition, repair, removal, demolition, use, location, occupancy, and maintenance in Michigan, including Sanilac County.
  “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.”
  Building Permit Information ↗Re-checked Sep 29, 2026
- Adopted (with conditions) — Michigan construction statewide, including Sanilac County.
  “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.”
  Building Permit Information ↗Re-checked Sep 29, 2026
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.”
Certificate of Occupancy Request ↗Re-checked Sep 11, 2026
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;”
Michigan Zoning Enabling Act ↗Re-checked Sep 11, 2026
Living in an RVLimited
RVs/house trailers occupied as a dwelling, only in cities, villages and townships to which the Housing Law of Michigan applies (population of 10,000 or more); not a statewide rule for all land
- Act applies only to each city, village and township with population of 10,000 or more per the last federal census (MCL 125.401(2)).
- Act does not apply to private dwellings and 2-family dwellings in a unit with population under 100,000 unless its legislative body adopts the provisions by resolution passed by majority vote.
- Vehicles duly licensed as vehicles may be occupied as a dwelling for reasonable periods without otherwise being subject to the act only when located in a park or place designated or licensed for the purpose by the corporate community, with adequate safety and sanitary facilities.
- Unincorporated or smaller units are not covered by this act; their rules are local zoning/county matters not found here.
population threshold for act applicability: >= 10000 people (private and 2-family dwellings need adoption by resolution if population under 100,000)
“this act applies to each city, village, and township that, according to the last regular or special federal census, has a population of 10,000 or more.”
MCL 125.402 Housing Law of Michigan; definitions ↗Re-checked Nov 6, 2026
Septic inspectionLimited
On-site sanitary wastewater systems in Michigan; inspections are administered through the applicable local health department as part of the coordinated onsite wastewater program.
- EGLE administers the onsite wastewater program in coordination with local health departments, which permit and inspect on-site sanitary wastewater systems.
- The described on-site systems are designed only for sanitary wastewater from bathrooms, kitchens, and laundry devices.
- Communities may impose local ordinance requirements in addition to state regulations implemented by local authorities.
- For systems serving individual homes, local health departments have authority; EGLE oversees design and construction of larger systems and the minimum contents of local sanitary codes.
- The cited statewide material does not establish a uniform statewide inspection interval or universal inspection trigger; those details require the applicable local sanitary code.
“Individual septic systems for homeowners are typically permitted and inspected by the local health department that covers the area where the home is located.”
Michigan Guide to Environmental Regulations, Chapter 3: Wastewater ↗Re-checked Nov 4, 2026
One more reviewed finding on this topic
- Limited — On-site septic systems in Michigan; inspection is carried out by local health departments
  “these on-site septic systems are permitted and inspected by the local health departments.”
  Michigan Guide to Environmental Regulations (EGLE) ↗Re-checked Nov 6, 2026
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.”
Disposal of residential wastewater such as swimming pool water ↗Re-checked Sep 11, 2026
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.”
Michigan Part 7 Plumbing Code Rules ↗Re-checked Sep 11, 2026
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.”
Michigan Building Code Part 4 Rules: Work Exempt from Permit ↗Re-checked Oct 1, 2026
Shed and accessory-building permit exemptionAvailable (with conditions)
Building-permit exemption for one-story detached accessory structures regulated by the Michigan Residential Code for one- and two-family dwellings and townhouses.
- The structure must be one-story and detached.
- Floor area must not exceed 200 square feet (18.58 m²).
- The exemption does not authorize work that violates the code or other laws or ordinances of the jurisdiction.
maximum floor area for exempt detached accessory structure: <= 200 square feet (One-story detached accessory structures only; equivalent stated as 18.58 m².)
“Building permits shall not be required for any of the following: (i) One-story detached accessory structures, if the floor area does not exceed 200 square feet (18.58 m²).”
Michigan Administrative Code, Construction Codes—Part 5, Residential Code ↗Re-checked Nov 4, 2026
Building in a floodplainRequired
Construction, fill, or alteration in qualifying floodplains affecting Sanilac County.
- A state floodplain permit is required for construction, fill, or alteration of a floodplain of a river, stream, or drain with a drainage area greater than or equal to 2 square miles.
- Construction and fill may be permitted outside the floodway if local ordinance and building standards are met and compensating excavation equals the volume of fill.
- New residential construction is prohibited in the floodway.
- New or substantially improved buildings in the 100-year floodplain must have the lowest floor at least one foot above the 100-year flood elevation.
- Part 31 permit fees are $100 for minor projects outside the floodway, $500 for qualifying floodway work without hydraulic analysis, and $2,000 when hydraulic analysis is required.
qualifying drainage area: >= 2 square miles (river, stream, or drain floodplain) · minimum lowest-floor elevation: >= 1 foot above 100-year flood elevation · minor Part 31 application fee: 100 USD (project outside floodway) · floodway application fee without hydraulic analysis: 500 USD · floodway application and review fee with hydraulic analysis: 2000 USD
“Any construction, fill or alteration of a floodplain of a river, stream, or drain which has a drainage area greater than or equal to 2 square miles will require a state floodplain permit under Part 31 of the Natural Resources and Environmental Protection Act.”
FAQ: Floods and Floodplain Management ↗Re-checked Sep 29, 2026
2 more reviewed findings on this topic
- Required — Occupation, construction, filling, or grade changes within the 1% annual-chance floodplain of a river, stream, or drain in Sanilac County
  “A permit is required for any occupation, construction, filling, or grade changes”
  Floodplain Management for Local Officials ↗Re-checked Sep 26, 2026
- Required — Alteration or occupation of the 100-year floodplain of a Michigan river, stream, or drain regulated under Part 31.
  “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.”
  Floodplains ↗Re-checked Oct 1, 2026
Permit feesVariable (with conditions)
Applications for Michigan building permits under the State Construction Code Act, except where the code provides otherwise.
- The application must be submitted to the appropriate enforcing agency.
- The fee is established by the enforcing agency; Michigan law therefore does not establish one uniform statewide building-permit amount.
- The statute permits additional permits for particular work, including plumbing and electrical, or other specified situations.
“The application shall be on a form prescribed by the commission and shall be accompanied by payment of the fee established by the enforcing agency.”
Stille-DeRossett-Hale Single State Construction Code Act ↗Re-checked Nov 4, 2026
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.”
michigan.gov ↗Re-checked Sep 11, 2026
5 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”
  Temporary campgrounds ↗Re-checked Oct 1, 2026
- 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.”
  Temporary campgrounds ↗Re-checked Oct 1, 2026
- 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.”
  Legislation governing campgrounds in Michigan ↗Re-checked Oct 1, 2026
- Limited — Operating a campground offering five or more campsites or recreational units, including temporary campground operations.
  “Part 125 of Michigan's Public Health Code, 1978 PA 368, as amended, and its administrative rules, establish the requirements for constructing, modifying, licensing, and operating a campground. A license from the Michigan Department of Environment, Great Lakes, and Energy (EGLE) is required to operate a campground offering five or more campsites/recreational units in the state of Michigan.”
  Campgrounds ↗Re-checked Nov 4, 2026
- Limited — Occupancy of a mobile home located in a seasonal mobile home park.
  “Mobile homes located in a seasonal mobile home park may be occupied on a full-time basis from April 1 to October 31, but shall not be occupied for more than 15 consecutive days in any 30-day period from November 1 to March 31.”
  Mobile Home Commission Act, 1987 PA 96 ↗Re-checked Nov 4, 2026
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.”
Building Permit Information ↗Re-checked Sep 21, 2026

Set by your township or city, not the county

In Michigan, zoning is adopted by each township or city, so Sanilac 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
Camping on your land
Tiny homes
Manufactured homes
Accessory dwellings
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.

Living off-grid in Sanilac County, Michigan

Is Sanilac County a good place to live off-grid or homestead?

Sanilac County scores 78/100 on the Bolthole Index, a strong county profile. Its strengths: a stronger property-autonomy legal backdrop and manageable long-term carry cost.

How much does land cost in Sanilac County, Michigan?

Land in Sanilac County runs about $6,380 per acre, based on the latest county data.

What is the water situation in Sanilac County?

Sanilac County gets about 32.8" of rain a year, with severe drought in roughly 1.9% of years.

How remote is Sanilac County?

A representative private-land location has about 13,180 people within a 30-minute drive and 3,211,439 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.

Building permits, zoning and land rules in Sanilac County, Michigan