What Building Code Applies to New Homes in Ohio?
The Residential Code of Ohio, who adopts it, who enforces it, and what it actually governs.
New one-, two- and three-family homes in Ohio are governed by the Residential Code of Ohio, abbreviated RCO. It's adopted by the Ohio Board of Building Standards, based on the International Residential Code, and enforced by certified local building departments rather than by the state.
What it is
The RCO applies to the construction, alteration, repair, use, location and maintenance of every one-, two- or three-family dwelling in Ohio. It's adopted by the Ohio Board of Building Standards, which sits within the Ohio Department of Commerce.
A distinction worth getting right
Ohio's commercial building code and its residential code are separate documents on separate update cycles, and they are not currently on the same edition. People conflate them constantly. If a code edition matters to your project, your building department is the authority on which one is in force.
Who enforces it
The Ohio Department of Commerce is explicit that local certified building departments and certified residential personnel enforce the code. The code itself requires that anyone intending to construct a residential building apply to the residential building official of a certified residential building department and obtain approval.
Practically, that means your code authority is a local office, and which one depends on your address. See Stark County and Akron and Summit County.
What the code governs
- Structural design, framing, spans and connections
- Foundations, including minimum footing depth and frost protection
- Egress, including bedroom windows and stair geometry
- Fire safety, smoke and carbon monoxide alarms
- Energy efficiency, insulation and air sealing
- Plumbing, electrical and mechanical systems
- Ventilation and moisture control
Local design criteria
The code includes a climatic and geographic design criteria table that each jurisdiction fills in for its own area. For our region the Akron-Canton station is used, with roughly 6,000 heating degree days, a 6 degree outdoor design dry-bulb temperature and a severe weathering classification.
Critically, the frost line depth is filled in by the jurisdiction rather than set statewide, which is why Stark and Summit counties publish different figures. See footing depth.
Why this matters to you
Code is a floor, not a target. It defines the minimum a home must meet, not what a well-built home should be. Insulation levels, HVAC design and material quality can all exceed it, and generally should. See energy-efficient options.
Code editions and amendments change over time. Your local building department is the authority on what applies to your project, and we confirm it as part of yours.