Bolthole Index

Auglaize County, Ohio

Zoning, building permits and septic rules in St. Marys, Ohio

St. Marys is a city in Auglaize County, Ohio. St. Marys adopts its own zoning, so inside its limits St. Marys’s rules apply, not the county’s. 4 rules below are quoted from official sources and independently re-checked, most recently on November 12, 2026. Rules for unincorporated land are on the Auglaize County page.

Answers from the rulebook for St. Marys

St. Marys’s own rules

  • Building code adoptedAdopted

    Building construction inside St. Marys city

    • Ohio plumbing code is enforced by the Auglaize County Board of Health.
    • Commercial structure enforcement is by the Miami County building department under an agreement between the Auglaize and Miami county commissioners.
    • Section 1313.02 authorizes an application for certification as a sub-department of the Auglaize County building department.
    “the ohio building code; and 4101:2 - the ohio mechanical code and ohio administrative code 4101:3 - the ohio plumbing code as promulgated by the ohio board of building standards, shall apply and be enforced within the city of st. marys, ohio, with the exception that the ohio plumbing code will be enforced by the auglaize county board of health.”
  • Local zoningPresent

    Land inside St. Marys city limits (Auglaize County)

    • The zoning ordinance text itself is published separately from the codified ordinances and was not opened.

    zoning ordinance: Ordinance 79-12, passed July 9, 1979

    “the city zoning ordinance established by ordinance 79-12, passed july 9, 1979, is published separately and is not codified herein.”
  • Subdividing landRegulated (with conditions)

    Subdivision of land inside St. Marys city

    • Subdivision regulations are published separately from the codified ordinances.
    • Plat review fees apply per the city permits page.
    “ordinance 1902 established the city subdivision regulations.”
  • Permit feesPublished

    City permit fees inside St. Marys city

    • Commercial/industrial and residential four units and above are referred to the Miami County building regulations.
    • Electrical permit fee rises to $30 effective Sept. 1, 2025.

    zoning permit fee: 10 USD

    “zoning permit $10.00 zoning permit (pdf) note: anyone working on a commercial/industrial and residential four units and above, please refer to the miami county ohio building regulations website.”

Still unanswered

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

  • Building permit — Building permits for homes inside St. Marys city
  • Owner-builder exemption — Owner-builder exemption inside St. Marys city
  • Inspections — Building inspections inside St. Marys city
  • Certificate of occupancy — Certificates of occupancy inside St. Marys city
  • Zoning districts — Zoning districts inside St. Marys city
21 more unanswered
  • 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
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals
  • Permit process

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

Off-grid gear

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

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