Taproom Conversion in a Former Mercantile Building
An applicant proposes converting a 4,800 sq ft single-story masonry building from mercantile to a craft brewery. The plan shows 2,200 sq ft of production area and a 2,600 sq ft taproom with tables and chairs, no fixed seating. The existing building has two 36-inch swinging doors: one at the front and one at the rear, 60 feet apart along the only exit access aisle. There is no automatic sprinkler system, and the ceiling height is 12 feet. The applicant's code analysis classifies the entire space as mercantile and calculates 2,600 ÷ 60 = 43 occupants, concluding that one exit is adequate and no sprinklers are required. The permit is submitted as a 'minor alteration' with no change of occupancy. The building official must decide whether to accept the analysis, what additional code requirements apply, and how to process the application under the existing building code.
1. Is the applicant's occupant load and exit calculation correct? Explain the classification and egress implications.
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No. The taproom is an assembly occupancy, not mercantile. Under IBC Table 1004.5, unconcentrated assembly with tables and chairs uses 15 sq ft per occupant, so 2,600 ÷ 15 = 174 occupants, not 43. The production area is likely Group F-1 or S-1; at 100 sq ft per occupant, 2,200 ÷ 100 = 22, for a total of about 196. Because the assembly occupant load exceeds 49, at least two means of egress are required, and the exits must be remotely located and sized for the total occupant load. The two existing 36-inch doors may provide enough egress width, but the building official must verify capacity, travel distance, panic hardware, and door swing. The applicant's mercantile classification cannot be accepted because the actual use is assembly.
2. What fire protection and accessibility issues does the change of use trigger?
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An A-2 assembly with an occupant load of 100 or more triggers sprinkler requirements under IBC 903.2.1.2 unless the existing building code provides an approved alternative. The building official should require a full IEBC analysis for change of occupancy, including fire separation, means of egress, and accessibility upgrades required for the new occupancy. The absence of sprinklers is a significant deficiency; the applicant may need to install a system or demonstrate an approved alternative. Accessibility: the taproom is a public accommodation; the accessible route, restrooms, and seating must be evaluated. The building official should not issue a permit as a minor alteration; a change-of-occupancy permit with a code analysis is required.
3. How should the building official process the permit given the 'minor alteration' label?
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Reject the minor alteration characterization. Require the applicant to submit a code analysis prepared by a registered design professional classifying each area, calculating occupant load, and identifying the IEBC compliance path. The building official should issue written plan review comments, not a verbal denial, and give the applicant an opportunity to revise. If the applicant disputes, explain the appeal process to the board of appeals. The permit should be processed as a change of occupancy with the applicable IEBC provisions; final approval requires a certificate of occupancy for the new use. Document all findings.