Bolthole Index

St. Clair County, Michigan

Building permits, zoning and septic in Mussey Township, Michigan

Mussey Township, Michigan requires a building permit before erecting, altering, moving or repairing a building, with limited exceptions for minor work.1 In St. Clair County, Mussey Township sets its own zoning, while septic and well permits come from St. Clair County Health Department.23 Temporary RV living during home construction is conditional, with a separate trailer permit and approved foundation required.45

At a glance

Building permit
Required, with limited minor-work exceptions1
Zoning
Township zoning applies; district controls matter2
Septic
St. Clair County Health Department; permit before installation or repair36
RV living
Conditional temporary stay during home construction in AG, SF and R-14
Minimum dwelling size
AG/SF: 1,200 sq ft; R-1: 1,000 sq ft78
Wells
County Health Department approval before private water-system work9
Owner-builder
State licensing exception for own use and occupancy on own property; building permits still apply10

Who to call

Building permits

Mussey Township Buildings

Township building applications, construction requirements and trade permits

(810) 395-4915

Planning & zoning

Mussey Township Planning and Zoning

Township zoning maps, ordinances and land-use applications

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

Well permits

St. Clair County Health Department - Environmental Health Division

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

(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

Online permits →

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 Mussey Township means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Mussey Township, MI?

Mussey Township requires a building permit before a building or structure is erected, altered, moved or repaired; limited minor-work exceptions exclude the specified structural, occupancy, light, ventilation and egress changes.1 Michigan construction codes apply inside Mussey Township, including residential-code provisions for dwellings.11

Mussey Township also requires a certificate of occupancy before land or buildings are occupied or used, with an accessory-building exception when included on the dwelling certificate and plot plan.12 Michigan’s own-use, own-occupancy residential-builder licensing exception does not remove building-permit, inspection or zoning obligations.10

Who issues building permits in Mussey Township?

Start with Mussey Township Buildings for the township’s building application and new-home requirements.13 Mussey Township assigns the address when the building permit is applied for and requests a performance bond with the application.13 The township asks applicants to allow 5 to 7 business days for processing.13

Electrical, plumbing, mechanical and air-conditioning work require separate permits.13 Mussey Township’s zoning-chapter inspection, permit and certificate fees are established by Township Board resolution, so ask Buildings for the current applicable amounts.14 Planning and Zoning publishes zoning maps, a fee schedule and applications for variances, rezoning, land splits and special land-use/site-plan review.15

Does Mussey Township have zoning, lot sizes and setbacks?

Mussey Township has its own zoning chapter, with AG, SF and R-1 among its published districts.216 Ordinary AG lots require 3 acres and ordinary SF lots require 2.5 acres; qualifying new-road lots have smaller minimums subject to frontage, density and net-buildable-area conditions.17 R-1 requires 2 acres without sewer and water, or 0.5 acre with sewer and water.18

Ordinary AG/SF setbacks include a 75-foot front yard and 50-foot rear yard; qualifying new-road rows use a 50-foot front yard.19 Mussey Township’s minimum dwelling floor area is 1,200 square feet in AG/SF and 1,000 square feet in R-1.78 Ask Township Planning and Zoning to identify the parcel’s district and applicable schedule before selecting a house footprint.15

How do septic and well permits work in Mussey Township?

Septic permits for homes in Mussey Township come from St. Clair County Health Department, and a sewage permit is required before installing or repairing a septic system.36 Contact the Environmental Health Division for questions about an existing or proposed septic system.20

St. Clair County’s soil ratings show only 0.1% rated not limited for conventional septic drain fields; that countywide measure supports getting a site evaluation, not a conclusion that a Mussey Township parcel cannot support septic.21 Private water-system construction also requires a county application and permit before work starts.9 Mussey Township’s new-home checklist calls for current county well and septic permits alongside the building application.13

Can you live in an RV or tiny home in Mussey Township?

Mussey Township may allow a road-licensed RV or trailer during construction of a principal single-family dwelling in AG, SF or R-1, after the dwelling building permit, foundation inspection approval and temporary trailer permit.45 The initial limit is 6 months, with a possible 6-month extension for substantial progress; occupancy is restricted to the owner and immediate family, with approved sanitation, a septic system, domestic well and performance guarantee required.4

We could not confirm a separate tiny-home occupancy rule; ask Mussey Township Planning and Zoning how a proposed unit would be classified.15 A small permanent dwelling must be evaluated against the district’s minimum floor area, while factory-built dwellings in AG/SF/R-1 face permanent-foundation, utility and design standards.7822

Building a home in Mussey Township: what are the steps?

  1. Ask Mussey Township Planning and Zoning to confirm the district and fit the proposed house to its lot-area, setback and floor-area requirements.1517197
  2. Obtain current well and septic permits from St. Clair County Health Department and a culvert permit from St. Clair County Road Commission.13
  3. Submit the township building application and performance bond, 3 plot plans showing house, well and septic locations, 2 sets of construction drawings including truss detail, energy calculations and proof of ownership.13
  4. Obtain the separate trade permits and arrange construction inspections with the enforcing agency.1323
  5. Obtain Mussey Township’s certificate of occupancy before using the completed home.12

What should you check before buying land in Mussey Township?

Mussey Township’s access rule generally requires uses to abut and have direct access to a public street with a minimum 66-foot right-of-way, so ask Planning and Zoning to review the proposed access.2415 St. Clair County Road Commission requires approval for work within county-road rights-of-way, including residential driveway work and inspection of existing driveways for new construction.25

Mussey Township excludes wetlands, floodplains and sub-aqueous areas from subdivision density and lot calculations, subject to a qualifying cluster-development exception.26 Michigan EGLE also regulates qualifying river, stream and drain floodplains; township zoning approval alone does not answer that state review.27 For land outside the township, use the St. Clair County guide to identify the applicable local building and zoning authority.28

Watch-outs

  • Mussey Township’s temporary RV construction allowance requires a temporary trailer permit and approved principal-dwelling foundation before the trailer is erected.5
  • An accessory apartment in Mussey Township needs county certification of septic capacity and owner occupancy of the principal or accessory unit.29
  • We could not confirm a general agricultural construction exemption in Mussey Township; ask Township Buildings before starting a barn or farm structure.13

Sources

  1. § 153.278 Permits (Mussey Township), quoted and re-checked
  2. codelibrary.amlegal.com (Mussey Township), quoted and re-checked
  3. musseytownship.org (Mussey Township), quoted and re-checked
  4. § 153.188 Temporary trailers (Mussey Township), quoted and re-checked
  5. § 153.188 Temporary trailers (Mussey Township), quoted and re-checked
  6. On-Site Sewage Disposal Systems, quoted and re-checked
  7. § 153.150 Height, bulk, density, area, setback and lot coverage by district (Mussey Township), quoted and re-checked
  8. § 153.150 Height, bulk, density, area, setback and lot coverage by district (Mussey Township), quoted and re-checked
  9. Drinking Water Wells, quoted and re-checked
  10. Frequently Asked Questions – Residential Builder (Michigan statewide rule), quoted and re-checked
  11. Building Permit Information (Mussey Township), quoted and re-checked
  12. § 153.279 Certificates (Mussey Township), quoted and re-checked
  13. Mussey Township Buildings (musseytownship.org)
  14. § 153.281 Fees (Mussey Township), quoted and re-checked
  15. Mussey Township Planning and Zoning (musseytownship.org)
  16. § 153.015 Districts (Mussey Township), quoted and re-checked
  17. § 153.150 Height, bulk, density, area, setback and lot coverage by district (Mussey Township), quoted and re-checked
  18. § 153.150 Height, bulk, density, area, setback and lot coverage by district (Mussey Township), quoted and re-checked
  19. § 153.150 Height, bulk, density, area, setback and lot coverage by district (Mussey Township), quoted and re-checked
  20. St. Clair County Health Department - Environmental Health Division (stclaircounty.org)
  21. 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
  22. § 153.189 Single-family dwelling unit standards (Mussey Township), quoted and re-checked
  23. MCL 125.1512, Inspection of construction (Michigan statewide rule), quoted and re-checked
  24. § 153.181 Access requirements (Mussey Township), quoted and re-checked
  25. St. Clair County Road Commission (sccrc-roads.org)
  26. § 153.150 Height, bulk, density, area, setback and lot coverage by district (Mussey Township), quoted and re-checked
  27. Floodplains (Michigan statewide rule), quoted and re-checked
  28. Statewide Jurisdiction List, quoted and re-checked
  29. § 153.223 Single-family accessory apartments (Mussey Township), 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 Mussey Township

Mussey Township’s own rules

  • Building permitRequired

    Erection, alteration, movement, or repair of buildings and structures inside Mussey Township.

    • Minor repairs or changes not involving the listed structural, occupancy, light, ventilation, or egress features are excepted.
    • Water-main, sanitary-sewer, paving, storm-drainage, and grading plans approved by the Township Engineer must accompany an application where necessary.
    “No building or structure, or part thereof, shall be hereinafter erected, altered, moved or repaired unless a building permit shall have been first issued for such work.”
  • InspectionsRequired

    Temporary recreational vehicles or trailers used during construction of a principal single-family dwelling.

    • Foundation installation, inspection, and approval by Building Inspection are required before the temporary trailer may be erected.
    • A temporary trailer permit is also required.
    “after installation, inspection and approval of the foundation for the principal single-family dwelling by the Building Inspection.”
  • Certificate of occupancyRequired

    Occupation or use of land, buildings, and structures inside Mussey Township.

    • Accessory buildings may not require separate certificates when included on the dwelling certificate and shown on the plot plan.
    • Applications are made in writing to the Building Inspector; issuance or refusal is addressed within five days after receipt if the requirements are met.
    “No land, building or part thereof, shall hereafter be occupied by or for any use, unless and until a certificate of occupancy shall have been issued for such use.”
  • Local zoningPresent

    Land inside Mussey Township.

    • The township code contains a zoning chapter adopted by ordinance passed October 11, 2000.
    “This chapter shall be known and may be cited as the township zoning chapter.”
  • Zoning districtsPublished

    Zoning districts inside Mussey Township.

    • The code lists AG, SF, R-1, RM, B-1, B-2, LI, and RC districts; district boundaries are governed separately by the zoning map and boundary provisions.
    “For the purpose of this chapter, the township is hereby divided into the following districts:”
  • Minimum dwelling sizeSpecified

    Single-family dwellings in AG and SF Districts.

    • The schedule distinguishes AG/SF lots with new roads from ordinary AG/SF lots; both list 1,200 square feet minimum floor area per single-family unit.

    minimum floor area: >= 1200 square feet (AG and SF schedule rows, including new-road rows.)

    “AG | 3 acres | 250 | 2½ | 35 | 75 | 30 | 60 | 50 | 1,200 | 16%”
    One more reviewed finding on this topic
  • Minimum lot sizeSpecified

    AG and SF Districts.

    • AG new-road lots may be 2.5 acres and SF new-road lots may be 2 acres under footnote (6), subject to its curb-cut, frontage, density, and net-buildable-area conditions.

    AG minimum lot area: 3 acres (2.5 acres for qualifying new-road lots.) · SF minimum lot area: 2.5 acres (2 acres for qualifying new-road lots.)

    “SF | 2.5 acres | 250 | 2½ | 35 | 75 | 30 | 60 | 50 | 1,200 | 20%”
    One more reviewed finding on this topic
  • SetbacksSpecified

    AG and SF Districts.

    • Ordinary AG/SF rows list 75-foot front, 30-foot least side, 60-foot total side, and 50-foot rear setbacks; qualifying new-road rows list 50-foot front, 20-foot least side, 40-foot total side, and 50-foot rear setbacks.
    • Residential districts abutting a major thoroughfare require at least 50 feet front setback.

    front setback: 75 feet (50 feet for qualifying new-road rows.) · rear setback: 50 feet

    “SF W/ new road | 2 acres (6) | 250 | 2½ | 35 | 50 | 20 | 40 | 50 | 1,200 | 35%”
    One more reviewed finding on this topic
  • Lot coverageSpecified

    AG and SF Districts.

    • Maximum building coverage is 16% in AG, 35% in AG with new road, 20% in SF, and 35% in SF with new road.

    maximum AG coverage: <= 16 percent (35% for qualifying AG new-road row.) · maximum SF coverage: <= 20 percent (35% for qualifying SF new-road row.)

    “AG W/new road | 2.5 acres (6) | 250 | 2½ | 35 | 50 | 20 | 40 | 50 | 1,200 | 35%”
  • Living in an RVLimited

    Temporary recreational-vehicle occupancy during construction of a principal single-family dwelling in AG, SF, or R-1 Districts.

    • Valid road license required.
    • Principal dwelling building permit and foundation inspection approval required.
    • Maximum six months, with one possible six-month extension for substantial progress.
    • Approved sanitary facilities, county health permits, septic system, and domestic water well required.
    • Only owner and immediate family may occupy.
    • One temporary RV per parcel; 10-foot separation from structures and lot lines; removal within two weeks after principal dwelling certificate of occupancy; performance guarantee required.

    initial maximum duration: 6 months (One six-month extension may be granted for substantial progress.) · maximum units per parcel: 1 RV

    “A temporary recreational vehicle or trailer holding a valid road license may be permitted in the Agricultural (AG), Single-Family Rural Residential (SF) and Single-Family (R-1) Districts”
  • Manufactured homesLimited

    Factory-built and manufactured single-family dwelling units in AG, SF, and R-1 Districts, excluding manufactured homes in licensed approved manufactured-home parks.

    • Current state and township construction standards must be met before placement and building-permit issuance.
    • Factory-built homes must meet HUD Mobile Home Construction and Safety Standards, 24 C.F.R. part 3280.
    • Permanent foundation, anchoring, Mobile Home Commission compliance, zoning, lot-size, setback, yard, sewer/water or approved private facilities, and design standards apply.
    “whether site-built or factory-built, other than manufactured homes located in a licensed manufactured home park approved under the provisions of § 153.061 (D), shall comply with the following regulations.”
  • Accessory dwellingsAllowed (with conditions)

    One accessory apartment in a single-family dwelling inside Mussey Township.

    • Lot must meet § 153.150 requirements.
    • Principal or accessory unit must be owner-occupied.
    • County Health Department must certify septic capacity.
    • One per lot and dwelling; one additional side/rear-yard parking space; one street-facing entrance; minimum 420 square feet; maximum 35% combined floor area; principal dwelling must be at least 1,200 square feet; maximum two bedrooms and 650 square feet.

    minimum accessory-apartment area: >= 420 square feet · maximum accessory-apartment area: <= 650 square feet · maximum combined-floor-area share: <= 35 percent

    “One accessory apartment may be permitted in a single-family dwelling unit, subject to the following.”
  • Who permits septicCounty

    Septic permitting for homes inside Mussey Township is handled by the St. Clair County Health Department.

    “Must have current well & septic permit from St. Clair County Health Department and culvert permit from the St. Clair County Road Commission.”
  • Driveway accessRequired

    All uses in every Mussey Township use district.

    • Direct access must be to a public street with minimum 66-foot right-of-way.
    • Business and industrial uses fronting Capac Road may be required to use a township service-drive easement instead of an individual driveway.

    minimum public-street right-of-way: >= 66 feet

    “All uses in every use district shall abut and have direct access to a public street with a minimum right-of-way width of 66 feet, except as modified by division (B) below.”
  • Building in a floodplainLimited

    Subdivision density and lot calculations involving floodplain land inside Mussey Township.

    • Floodplain areas are excluded from net-buildable-land calculations for maximum density and number of lots.
    • For an approved single-family cluster development, the Planning Commission may approve up to 50% of wetland, floodplain, and sub-aqueous areas subject to the applicable cluster standards.

    maximum cluster floodplain inclusion: <= 50 percent (Only for qualifying approved single-family cluster developments.)

    “areas such as wetlands, floodplains and sub-aqueous areas shall not be included in calculations for determining maximum density and number of lots permitted”
  • Permit feesVariable (with conditions)

    Inspection, permit, certificate, and copy fees under the township zoning chapter.

    • Fees may be collected in advance.
    • Amounts are established by Township Board resolution and cover inspection and enforcement supervision costs.
    “The amount of such fees shall be established by resolution of the Township Board and shall cover the cost of inspection and supervision resulting from enforcement of this chapter.”

Rules another office applies inside Mussey Township

Mussey Township does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Building code adoptedAdopted (with conditions)

    Construction and occupancy inside Mussey Township under Michigan's statewide building-code system.

    • One- and two-family dwelling provisions are in the Michigan Residential Code.
    • The appropriate enforcing agency must receive the permit application.
    “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.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Mussey Township or St. Clair County directly.

  • Owner-builder exemption — Owner-builder licensing or permit exemptions inside Mussey Township.
  • Tiny homes — Tiny-home occupancy inside Mussey Township.
  • Septic inspection — Routine or final septic inspection requirements inside Mussey Township.
  • Agricultural exemption — Agricultural construction or agricultural-use exemptions inside Mussey Township.
  • Short-term rentals — Short-term rental use inside Mussey Township.

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 Mussey Township publishes no rule on the point, not that none exists. St. Clair County’s page lists the county offices to call.

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