Columbus's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Columbus, Ohio, there are 7 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Tiny Homes

Columbus permits tiny homes on permanent foundations as standard single-family dwellings if they meet the Ohio Residential Code minimums, including Appendix Q small-dwelling provisions. Tiny homes on wheels are treated as recreational vehicles and are not allowed as permanent residences on residential lots.

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Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact [Columbus code enforcement](https://codes.ohio.gov/ohio-administrative-code/rule-4101:8-aq-01) directly for current fines, enforcement procedures, and hearing options.

ADU Rules

Columbus passed Ordinance 2526-2025 (effective late 2025) amending Title 33 (Zoning Code) to allow Accessory Dwelling Units (ADUs) by right in all residential and apartment districts (Chapters 3332 and 3333). The ordinance removes most variance hurdles, exempts ADUs from added parking, frontage, and lot-width requirements, and permits internal (basement/attic), attached (above garage), and detached ADU types. ADUs must remain clearly accessory and subordinate in scale to the principal dwelling.

Key details: Authorizing Ordinance: Columbus Ord. 2526-2025. Code Title: Title 33 (Zoning), Chapters 3332 & 3333. State Authority: Ohio R.C. 713.06 (municipal zoning). Permitted Districts: All residential and apartment-residential. ADUs Per Lot: One.

Construction of an ADU without zoning clearance and a building permit violates Title 33 and Title 41 (Building Code) of the Columbus City Codes and can result in stop-work orders, civil fines, and required after-the-fact compliance. Columbus Code Enforcement may issue notices of violation under Chapter 4501; continued non-compliance may be referred to the Columbus Environmental Court (Franklin County Municipal Court).

If you are coming from a city with tighter rules, you will find Columbus gives residents more flexibility on adu rules.

Shed Rules

Columbus regulates sheds as accessory structures under Title 33 Zoning Code §3332.38 (Private garage). Sheds 200 square feet or larger require a building permit under the Residential Code of Ohio. Accessory structures must be located in the rear yard, set back at least 5 feet from side and rear property lines, separated from the principal dwelling, and may not exceed 30% rear-yard coverage in residential districts.

Key details: Code Section: Columbus CC §3332.38. Permit Threshold: 200 sq ft or larger. Side/Rear Setback: At least 5 feet. Default Height Limit: 15 feet. Rear-Yard Coverage: 30% maximum.

Building or placing a shed without required zoning clearance or building permits violates Title 33 and Title 41 of the Columbus City Codes. Code Enforcement may issue notices under Chapter 4501, requiring removal, relocation, or after-the-fact permitting. Continued non-compliance can result in civil fines and referral to the Columbus Environmental Court (Franklin County Municipal Court).

ADU Owner Occupancy

The Columbus Title 33 ADU Pilot Program adopted in 2025 does not require the property owner to live on-site. ADUs may be rented to non-relatives, and both the primary dwelling and the ADU may be rented simultaneously. No deed restriction or owner-occupancy affidavit is required at permit issuance. HOA covenants in deed-restricted subdivisions may still impose owner-occupancy independently.

Key details: Owner-Occupancy: Not required. Authority: Title 33 ADU Pilot (2025). Rental Registration: Title 47 applies if rented. State Law: No Ohio ADU statute.

No city violation for non-owner-occupancy. Failure to register rental property with Code Enforcement under Title 47 carries civil penalties. HOA enforcement is a private civil matter.

Columbus is more permissive than most cities when it comes to adu owner occupancy. That said, there are still limits.

ADU Rental Restrictions

Columbus permits long-term rentals (30+ days) of ADUs without special license beyond the citywide rental registration under Title 47. Short-term rentals (under 30 days) are regulated under Columbus City Code Ch. 599 (Short-Term Rentals), requiring an STR permit, primary-residence verification for certain permit types, and payment of the 5.1% Columbus hotel/motel excise tax and the 5% Franklin County lodging excise tax.

Key details: Long-Term Rental: Title 47 registration only. Short-Term Rental: Ch. 599 permit required. Hotel Tax: 5.1% city + 5% county. STR Insurance: $1M liability required.

Operating an STR without a Ch. 599 permit is a misdemeanor with civil penalties up to $1,000 per day. Failure to register as a rental property under Title 47 carries separate penalties. Unpaid hotel/motel excise tax is recoverable with interest and penalties under Ch. 371.

ADU Permits

Columbus permits ADUs by-right in all residential and apartment residential zoning districts under the Title 33 ADU Pilot Program ordinance effective December 24, 2025. Permits are issued by the Department of Building and Zoning Services under the Ohio Building Code and the Residential Code of Ohio. ADUs may not exceed 65% of the principal building's floor area or 1,000 sq ft (whichever is greater) and may not exceed the principal building's height or 25 ft.

Key details: Authority: Title 33 ADU Pilot (eff. 12/24/2025). Size Cap: 65% or 1,000 sq ft, greater. Height: Principal or 25 ft, lesser. Parking: None required.

Unpermitted construction violates Title 41 (Building Code) and Title 33 (Zoning Code), enforced by Code Enforcement and Building and Zoning Services. Stop-work orders, doubled permit fees, daily civil penalties, and required removal are standard remedies. Failure to obtain Certificate of Occupancy prevents legal use.

ADU Impact Fees

Columbus does not levy a citywide impact fee on new residential construction, including ADUs. Costs are limited to standard building, electrical, plumbing, and HVAC permit fees under Columbus City Code Title 41, plus separate utility connection charges from Columbus Division of Water, Division of Sewerage and Drainage, and the relevant electric and gas providers. Columbus City School District impact fees do not apply.

Key details: Citywide Impact Fee: None. Permit Fees: Title 41 by valuation. Water/Sewer Tap: $3,000-$10,000+ separate. School Fees: None.

Failure to pay permit fees prevents issuance. Failure to pay utility tap fees prevents service connection. No specific 'impact fee violation' exists since no impact fee is charged.

The rules around adu impact fees in Columbus lean permissive, but that does not mean anything goes.

The Bottom Line

Compared to many U.S. cities, Columbus gives residents more room on accessory structures. 3 of the 7 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

All of the above reflects Columbus's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.