City of Cincinnati, Ohio - Department of Buildings & Inspections

City of Cincinnati, Ohio

city

805 Central Avenue, Suite 500, Cincinnati, OH 45202

Not required

Required

Cincinnati's Permit Center is at 805 Central Ave., Suite 500, Cincinnati, OH 45202; customer service is 513-352-3271. Although routine residential roof-covering work is exempt from a building permit for 1-, 2- and 3-family detached dwellings (see repair_permit_threshold), the Department of Buildings & Inspections does publish a "Roofing Data Sheet" among its permit application forms - marked "NOT REQUIRED FOR ONE AND TWO FAMILIES" - for roofing work (multi-family, commercial, or work exceeding the permit exemption) that does require a permit; the form records existing/proposed roof-covering type, decking, slope, layer count and area, and has the plans examiner mark a required fire-resistive classification (U.L. Class "A"/"B", U.L. Class "C", or nonclassified) - a FIRE rating, not an impact rating. Separately, the Department's own permit-review-process page states verbatim: "Ohio law requires that we review your permit application within 30 days from when we receive it."

SET BY STATE RULE. Ohio regulates one-, two-, and three-family dwelling construction through a single statewide code, the Residential Code of Ohio (RCO), adopted by the state Board of Building Standards under Ohio Revised Code Chapter 3781 and codified in Ohio Administrative Code Chapter 4101:8 (rules 4101:8-1 through 4101:8-25, 4101:8-29, 4101:8-34 and 4101:8-44 collectively make up the RCO). The current edition is the "2019 Residential Code of Ohio," based on the 2018 International Residential Code, first printing; OAC 4101:8-1-01 (Administration/scope) was filed effective July 1, 2019. The Board subsequently amended the 2019 RCO with changes effective March 1, 2024 and a further set ("2019 RCO Residential Code of Ohio with April 2024 Amendments") effective April 15, 2024. Ohio has NOT moved to a newer IRC base edition (e.g. 2021) as of this verification date; the 2018-IRC-based 2019 RCO, as amended, remains current. Cincinnati has no authority to adopt a different or competing residential building code: Ohio Rev. Code 3781.11 requires the Board's rules to "provide standards and requirements that are uniform throughout the state" for residential buildings, and Ohio Rev. Code 3781.01 permits a local governing authority only to adopt "additional regulations governing residential structures that do not conflict with the state residential building code," subject to Board review under division (C).

Not required — SET BY STATE RULE, and a genuine, non-obvious deviation from most other IRC-based states. Ohio's RCO does NOT carry forward the base IRC's prescriptive drip-edge provision. The ENTIRE content of RCO Section 905.2.8.5 is, verbatim: "905.2.8.5 Drip edge. Refer to Sections 903.1 and 905.1." Neither cross-referenced section imposes a drip edge: Section 903.1 (General) provides only that "Roof decks shall be covered with approved roof coverings secured to the building or structure in accordance with the provisions of this chapter. Roof assemblies shall be designed and installed in accordance with this code and the approved manufacturer's instructions such that the roof assembly shall serve to protect the building or structure," and Section 905.1 (Roof covering application) is a general wind-load-resistance provision. There is therefore no numbered Ohio provision requiring a drip edge at eaves and rakes with the usual dimensional and fastening specifications; where a drip edge is required in Ohio, it is required by the roof-covering manufacturer's approved installation instructions operating through Section 903.1, not by a freestanding code mandate. Cincinnati Municipal Code Chapter 1115 (One, Two and Three [Family Dwellings]) is the city's own local adopting instrument for the RCO - Sec. 1115-01(B) incorporates the RCO "as if set out at length herein, except for changes, deletions, and substitutions as set forth herein" - and Sec. 1115-03 (Changes to Ohio Residential Code Sections) is the complete, exhaustive list of every RCO section Cincinnati changes: only Section 910.1 (reroofing administrative language) and Section 1101.2 (mechanical administrative language). Section 905.2.8.5 is not among them, so Cincinnati adds no drip-edge requirement of its own; the state rule stands unmodified in Cincinnati. About drip edge

Required — SET BY STATE RULE - required in Cincinnati exactly as everywhere else in Ohio, because Ohio makes the ice-damming determination statewide by rule rather than leaving it to local option. RCO Table 301.2(1) pre-fills "Ice Barrier Underlayment Required" as "Yes" for the whole state, with footnote (h): "In accordance with Sections 905.1.2, 905.4.3.1, 905.5.3.1, 905.6.3.1, 905.7.3.1 and 905.8.3.1, all jurisdictions in Ohio have a history of local damage from the effects of ice damming." RCO Section 905.1.2 (Ice barriers) then provides, verbatim: "In areas where there has been a history of ice forming along the eaves causing a backup of water as designated in Table 301.2(1), an ice barrier shall be installed for asphalt shingles, metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shingles and wood shakes. The ice barrier shall consist of not fewer than two layers of underlayment cemented together, or a self-adhering polymer-modified bitumen sheet shall be used in place of normal underlayment and extend from the lowest edges of all roof surfaces to a point not less than 24 inches (610 mm) inside the exterior wall line of the building. The 24 inch measurement shall be along the slope of the roof from the point where the projected outside face of the wall intersects the roof deck. On roofs with slope equal to or greater than eight units vertical in 12 units horizontal (67-percent slope), the ice barrier shall also be applied not less than 36 inches measured along the roof slope from the eave edge of the building." The final two sentences are Ohio-specific additions beyond the base 2018 IRC text. Exception: "Detached accessory structures and roof assemblies terminating at a vertical wall over unconditioned floor areas" (the italicised clause is also an Ohio addition). About ice & water barrier

Not required — The Department of Buildings & Inspections' Construction Inspections page lists the "Minimum Required Inspections" that apply to permitted new and addition construction in Cincinnati: Soil Inspection, Foundation Inspection, Basement Slab Inspection, Plumbing Inspection (under-slab piping), Framing Inspection and Initial Fire Stop Inspection, Insulation Inspection and Balance of Fire Stop Inspection, and Final Inspection. No roof-covering-specific or mid-roof inspection step appears anywhere in that list. Because Cincinnati additionally exempts ordinary residential roof coverings (no more than two layers) from the building-permit requirement altogether for 1-, 2- and 3-family detached dwellings (see repair_permit_threshold), a permit-triggered mid-roof inspection would not arise for the routine residential re-roof case in any event.

Not required — Checked at both layers Cincinnati residential roofing actually runs through. STATE LAYER: OAC 4101:8-9-01 (Roof assemblies, Sections 901 through 908, 30 printed pages) was read in full and contains no UL 2218 or "Class 4" impact-resistance provision anywhere; its only rated-classification content is FIRE classification under Section 902 ("Class A, B or C roofing," tested to ASTM E108/UL 790, or UL 1703/UL 2703 for photovoltaic panel systems) and WIND classification under Section 905 (ASTM D3161/D7158, printed in the "CLASSIFICATION OF ASPHALT ROOF SHINGLES" table). The companion rule OAC 4101:8-3-01 (Building planning) corroborates the absence: its statewide design-criteria table marks the "Wind-borne debris wind zone(s)" row "Deleted." CITY LAYER: Cincinnati Municipal Code Chapter 1115 (One, Two and Three [Family Dwellings]) is the city's own local adopting instrument - Sec. 1115-01(B) incorporates the RCO "as if set out at length herein, except for changes, deletions, and substitutions as set forth herein," under the local-amendment authority Ohio Rev. Code 3781.01(B) grants a municipal corporation. All 11 sections of the chapter (Secs. 1115-01 through 1115-23) were read in full, including Sec. 1115-03 (Changes to Ohio Residential Code Sections), which is the complete, exhaustive list of every RCO section Cincinnati changes: only Section 910.1 (reroofing administrative language) and Section 1101.2 (mechanical administrative language). No provision in Chapter 1115, and no item on that change list, touches roof-covering classification, UL 2218, or Class 4 impact resistance.

CITY-SPECIFIC, and unusually permissive. Cincinnati's Department of Buildings & Inspections "Do I Need A Permit?" page lists, among the work that does NOT require a building permit for 1-, 2- and 3-family detached dwellings: "Roof coverings (no more than two layers of roofing material)" and, as a separate listed item, "Gutters and downspouts (includes valleys, flashings, soffits, fascia and associated trim work)." A routine residential re-roof or roof repair in Cincinnati therefore needs no building permit so long as the finished assembly carries no more than two layers of roofing material. Two independent limits still bite. (1) The two-layer ceiling is not merely administrative: RCO Section 908.3.1.1 forbids a roof recover "[w]here the existing roof has two or more applications of any type of roof covering," so work that would create a third layer is both outside the permit exemption and prohibited outright - full tear-off to the deck is required instead (see roof_layer_limit). (2) The exemption covers roof COVERINGS; work reaching the structure (rafters, trusses, load-bearing supports) or otherwise beyond a covering replacement is not within the listed exemption. Separately, and regardless of the building-permit exemption, if the property or building is designated historic by the City of Cincinnati the owner must apply for and receive a Certificate of Appropriateness from the Urban Conservator (513-352-4848) BEFORE starting work; Cincinnati also cautions that other departments and agencies regulate certain phases of construction and that it is the applicant's responsibility to secure any permits those bodies require.

SET BY STATE RULE. RCO Table 301.2(1) ("Climatic and Geographic Design Criteria"), as printed in the state rule itself, pre-fills a Wind Design Speed of 115 mph (ultimate design wind speed) for the entire state - the value is printed in the rule's own table rather than left blank for local fill-in. The same statewide table also pre-fills Weathering as "severe", Termite as "moderate to heavy", and Ice Barrier Underlayment Required as "Yes". Wind exposure category is determined site-specifically rather than by state or city rule. Ground snow load is the one geographically-varying input and is NOT a statewide constant: the master rule leaves that cell blank, with footnote (o) directing that "The jurisdiction shall fill in this section of the table using the Ground Snow Loads in Figure 301.2(6)" - i.e. each jurisdiction reads its own value off the statewide reference map. No Hamilton County / Cincinnati ground snow load is recorded here, as none was obtained from a Hamilton County or City of Cincinnati source.

SET BY STATE RULE, and independently reflected in Cincinnati's own permit-exemption wording ("no more than two layers of roofing material"). RCO Section 908.3 (Roof replacement) states: "Roof replacement shall include the removal of existing layers of roof coverings down to the roof deck. Exception: Where the existing roof assembly includes an ice barrier membrane that is adhered to the roof deck, the existing ice barrier membrane shall be permitted to remain in place and be covered with an additional layer of ice barrier membrane in accordance with Section 905." Section 908.3.1 (Roof recover) permits installing a new roof covering over an existing one where any of four conditions occur, the first being "[w]here the new roof covering is installed in accordance with the roof covering manufacturer's approved instructions." Section 908.3.1.1 (Roof recover not allowed) then bars a recover "where any of the following conditions occur: 1. Where the existing roof or roof covering is water soaked or has deteriorated to the point that the existing roof or roof covering is not adequate as a base for additional roofing. 2. Where the existing roof covering is slate, clay, cement or asbestos-cement tile. 3. Where the existing roof has two or more applications of any type of roof covering." Net effect for the common asphalt-shingle case: one existing layer may be recovered over when the manufacturer's instructions are followed and the existing roof is sound; once two or more layers already exist, full tear-off to the deck is mandatory.

SET BY STATE RULE - applies identically in Cincinnati as everywhere else in Ohio. RCO Section 905.2.1 (Sheathing requirements) states verbatim: "Asphalt shingles shall be fastened to solidly sheathed decks." Ohio carries this base IRC language through without amendment - no Ohio-specific addition (such as a nominal-board allowance) was found in the rule text.

Hamilton County's combined state-and-local sales and use tax rate is 7.80%, per the Ohio Department of Taxation's Sales and Use Tax Rate Map (dated March 31, 2026, reflecting rates in effect as of October 2025): a 5.75% state rate plus a 1.25% Hamilton County permissive rate plus a 0.80% transit permissive rate, printed in the map's own county table as "Hamilton 1.25% 0.80% 7.80%." The map's narrative separately lists Hamilton County among the seven Ohio counties with rates of 7.30% or higher, at "7.80 percent" - the third-highest county rate in the state, below only Cuyahoga and Franklin Counties (8.00% each).