Bolthole Index

Hamilton County, Ohio

Building permits, zoning and septic rules in the Village of Mariemont, Ohio

The Village of Mariemont, Ohio adopts its own zoning code, and its own Building Department administers that code and applicable Ohio building codes12. Septic permits for homes not on public sewer come from Hamilton County Public Health, not the village3. Lots here are small village lots, not rural acreage4.

At a glance

Zoning
Village zoning code (Title XV, Chapter 151), administered by the village Building Department12
Zoning districts
Residence A, B, C, D, Business and Industrial5
Building permits
Reviewed and inspected by the village Building Department under applicable Ohio building codes2
Minimum lot
6,750 square feet per single-family dwelling in the cited residence districts4
Septic
Hamilton County Public Health approves household sewage treatment systems3
Driveways
At least 12 feet wide and paved; combined width at the street line no more than 60% of lot width6

Who to call

Building permits

Village of Mariemont Building Department

Administers the village zoning code and applicable Ohio building codes, reviews permit applications, conducts inspections and issues final certifications

(513) 271-3246

[email protected]

6907 Wooster Pike Mariemont, OH 45227

Septic permits

Hamilton County Public Health

Approves plans, issues permits and inspects household sewage treatment (septic) systems outside Cincinnati, Norwood and Springdale

(513)946-7800

1701 Patricia McCollum Way, Dept. 93 (5th Floor), Cincinnati, OH 45237

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 14, 2026.

Off-grid gear

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

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Does Mariemont, Ohio have zoning, and what does it mean for lot size and setbacks?

Yes. The Village of Mariemont adopts its own zoning chapter, Title XV, Chapter 151 of the village code1. The village's districts are Residence A, Residence B, Residence C, Residence D, Business and Industrial5.

A single-family dwelling in the cited residence districts needs at least 6,750 square feet of lot area, and Residence A and B lots are listed with a minimum width of 40 feet, subject to plat exceptions we did not review4. Side yards scale with lot width and building height: for a 40-foot-wide lot with a building up to 18 feet tall, the least side yard is 5 feet7.

We could not confirm Mariemont's rules for RV occupancy, tiny homes, accessory dwellings or minimum dwelling size; ask the Building Department2.

Do you need a building permit in Mariemont, and who issues it?

The village's own Building Department handles building and zoning work in Mariemont. It states that it administers the Village of Mariemont Zoning Code and applicable Ohio building codes, reviews permit applications, conducts inspections and issues final certifications2. Ohio's building codes are set statewide by the Board of Building Standards and enforced by certified municipal, township and county building departments8.

The county's Buildings + Inspections Division issues building permits for unincorporated townships and a short list of contract jurisdictions, which this guide does not tie to Mariemont9. We could not confirm a permit fee schedule or which small projects are exempt, so call the village office before you start.

Who handles septic permits and sewer connection in Mariemont?

Hamilton County Public Health approves plans for household sewage treatment systems across the county except the cities of Cincinnati, Norwood and Springdale, so septic permits for a Mariemont address go through the county health district, not the village3. The permit is issued once inspection paperwork is complete and the fee is paid within 30 days10. Homes within a certain distance of a sanitary sewer must connect to it, regardless of whether an existing septic system still works11.

We did not confirm whether a particular Mariemont street is sewered; ask the health district at12 before assuming you can install a septic system.

What are Mariemont's driveway rules?

In any residential district, a Mariemont driveway may not be narrower than 12 feet, must be paved with concrete, asphalt, brick pavers or crushed stone, and the combined width of driveways at the street line may not exceed 60% of the lot width6. The required width of a curb cut may exceed the driveway width by three feet6. The Building Department's page lists zoning permits for driveways, fences and trees under the village office2.

Building a home in Mariemont: the steps, in order

  1. Contact the Mariemont Building Department to confirm your lot's zoning district and any local historic district review2.
  2. Check lot area, width and side-yard minimums for your district47.
  3. Confirm sewer or septic with Hamilton County Public Health and obtain a septic permit if you are not connecting to sewer3.
  4. Apply for permits through the village office and schedule inspections as work proceeds2.
  5. Plan the driveway to the village's width and paving rules6.

What stays with Hamilton County, and what to check before you buy in Mariemont?

Septic approval and sewer-connection questions stay with Hamilton County Public Health3. For land outside village limits, use the Hamilton County page, because the village's rules do not apply there. County-level figures give context only: Hamilton County's effective property tax rate is 1.5%13.

Watch-outs

  • We could not confirm Mariemont's building permit fees, exemptions, RV or tiny-home rules, or floodplain rules; call the village Building Department before you buy or build2.
  • Mariemont includes local historic districts, and the Building Department coordinates reviews within them, which can add steps to exterior changes2.
  • Septic permits come from Hamilton County Public Health, not the village, and nearby sewers can make connection mandatory311.

Sources

  1. Mariemont Code of Ordinances §§ 151.086-151.089 (tabulation and formulae; parking) (Village of Mariemont), quoted and re-checked
  2. Village of Mariemont Building Department (mariemont.org)
  3. Sewage Treatment Systems (STS), quoted and re-checked
  4. Mariemont Code of Ordinances §§ 151.086-151.089 (tabulation and formulae; parking) (Village of Mariemont), quoted and re-checked
  5. Mariemont Code of Ordinances §§ 151.086-151.089 (tabulation and formulae; parking) (Village of Mariemont), quoted and re-checked
  6. Mariemont Code of Ordinances §§ 151.086-151.089 (tabulation and formulae; parking) (Village of Mariemont), quoted and re-checked
  7. Mariemont Code of Ordinances §§ 151.086-151.089 (tabulation and formulae; parking) (Village of Mariemont), quoted and re-checked
  8. Section 3781.10 | Board of building standards - powers and duties (Ohio statewide rule), quoted and re-checked
  9. Buildings and Inspections, quoted and re-checked
  10. Sewage Treatment Systems (STS), quoted and re-checked
  11. Connecting to Sewer - Hamilton County Public Health, quoted and re-checked
  12. Hamilton County Public Health (hamiltoncountyhealth.org)
  13. Effective property tax rate: Bolthole Index county data

Written October 14, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Village of Mariemont

Village of Mariemont’s own rules

  • Local zoningPresent

    Land inside Mariemont village limits; the village adopts its own zoning chapter (Title XV, Chapter 151, Land Usage)

    • Chapter 151 effective date stated as March 25, 1996 (Ord. O-4-96); later amended
    “in all zoning districts, off-street parking facilities for the storage or parking of self-propelled passenger vehicles for the use of occupants”
  • Zoning districtsPublished

    Mariemont village zoning districts: Residence A, B, C, D, Business, Industrial

    • Full district map and use lists not reviewed

    districts: Residence A, Residence B, Residence C, Residence D, Business, Industrial

    “business - - 45 none none none 10 15 20 industrial - - 120 none none none none none none”
  • Minimum lot sizeSpecified

    Single-family detached dwelling in Residential A, B, C districts inside Mariemont village

    • Larger areas for 2-3 family (10,000 sq ft), 4-family (10,500), 5-family (11,750) dwellings in B/C/D districts

    minimum lot area per single-family dwelling: >= 6750 sq ft · minimum lot width Residence A/B: >= 40 ft (plat exceptions not reviewed)

    “minimum lot area per dwelling 6,750 square feet 10,000 square feet 10,500 square feet 11,750 square feet”
  • SetbacksDistrict specific (with conditions)

    Side yards in Residence A, B and C districts inside Mariemont village (single-family)

    • Side yard minimum scales with lot width and building height (0-18, 18-30, 30+ ft)
    • Front/rear setbacks in § 151.086(b) table; column mapping not confirmed
    • Residence D: 10 ft abutting commercial/multi-family; 20 ft abutting single/two-family

    least side yard, 40 ft wide lot, building 0-18 ft: >= 5 ft (sum of both side yards 13.00 ft) · least side yard, 40 ft wide lot, building 30+ ft: >= 7 ft (sum of both side yards 15.75 ft)

    “residence a, b, and c 40 5 13.00 6 14.25 7 15.75 50 6 14.25 7 15.50 8 17.00”
  • Driveway accessLimited

    Driveways in residential districts inside Mariemont village

    • Paved with concrete, asphalt, brick pavers or crushed stone
    • Aggregate width at street line not over 60% of lot width
    • Curb cut may exceed driveway width by three feet

    minimum driveway width: >= 12 ft · max aggregate width at street line: <= 60 % of lot width

    “in any residential district, no driveway shall be constructed less than 12 feet in width. all driveways shall be paved with concrete, asphalt, brick pavers or crushed stone. (b) the aggregate width of driveway(s) at the street line shall not exceed 60% of the width of the lot. (c) required width of curb cuts may exceed the driveway width by three feet.”

Still unanswered

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

  • Building permit — Building permits inside Mariemont village
  • Owner-builder exemption — Owner-builder exemption inside Mariemont village
  • Building code adopted — Building code inside Mariemont village
  • Inspections — Building inspections inside Mariemont village
  • Certificate of occupancy — Certificates of occupancy inside Mariemont village
19 more unanswered
  • Minimum dwelling size
  • Lot coverage
  • 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
  • Subdividing land
  • Building in a floodplain
  • Short-term rentals
  • Permit fees
  • 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 Village of Mariemont publishes no rule on the point, not that none exists. Hamilton County’s page lists the county offices to call.

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