Furniture Showroom to Banquet Hall: Occupant Load and Egress Capacity

Classification

This is an assembly occupancy, not business or mercantile. The presence of loose tables and chairs for 50 or more persons congregating for dining/entertainment is the defining feature, and the change from showroom to banquet hall is a change of occupancy that requires the new use's egress to be evaluated even though the shell is existing. The existing-building provisions may allow trade-offs on other features; they do not allow egress capacity below what the new occupant load demands.

Occupant load

• Use the net area actually available for seating, not the gross building area.
• Assembly with tables and chairs: 15 ft2 (1.4 m2) net per person.
• 850 m2 = 9,150 ft2; 9,150 / 15 = 610 persons.
• Add the commercial kitchen: 150 m2 = 1,615 ft2 at 200 ft2 gross per person = 8 persons.
• Storage, restrooms and circulation are not counted.
• Design occupant load: about 620 persons - roughly 25% above the owner's stated 500.

Exits required

Above 500 and not exceeding 1,000 occupants, three exits are required. Four door leaves exist, but the two front doors share a vestibule and are effectively one location, so the arrangement delivers three remote exits plus a duplicate. That meets the minimum, but only just - and where four or more exits are provided, no more than two may be close together, so the vestibule pair must be watched. The exit count passes; the exit capacity is the problem.

Capacity check

• Level components in a non-sprinklered building: 0.3 in per person (7.6 mm).
• Required width = 620 x 0.3 = 186 in (4.7 m).
• Provided clear width = 4 x 34 in = 136 in (3.45 m).
• Shortfall = 50 in, about 27% below requirement.

So the building fails on width even if all four doors are counted and none is lost. Note the front vestibule: doors in series do not add width, so if the vestibule has an inner and outer pair, only the narrower set counts.

Other features to flag

• Assembly occupancies over 50 occupants: doors must swing in the direction of egress with panic hardware; confirm the side and rear doors are not inswinging.
• Aisle widths and aisle accessways for loose seating must be maintained, and the seating layout must not be rearranged later to block them - a plan-review condition, not a one-time check.
• Emergency lighting and illuminated exit signs on the new egress paths.
• Travel distance: verify the longest path stays within the assembly limit for a non-sprinklered building (200 ft / 61 m); the 50 m building diagonal suggests it may just comply, but it must be measured, not assumed.
• The kitchen is a new hazard (cooking equipment, hood suppression, grease) that did not exist in the showroom.

Option A - Add sprinklers (recommended)

• Level-component capacity drops to 0.2 in per person: 620 x 0.2 = 124 in, which is satisfied by the existing 136 in.
• The allowable travel distance also increases, which resolves the marginal travel-distance question.
• This is the only option that preserves the owner's business plan with essentially no door construction work.
• Verify the water supply first: a 1,200 m2 unsprinklered building may well need a new service, backflow assembly, or pump, and that cost has to be part of the comparison.

Option B - Cut the occupant load to match the doors

• 136 in / 0.3 in per person = 453 persons maximum without sprinklers.
• At 15 ft2 net, that caps the seating/dance area at about 6,800 ft2 (630 m2) - the owner loses roughly 220 seats, and even the stated 500 still fails.

Option C - Add width without sprinklers

• Need 186 in; have 136 in; 50 in short. That is two additional 36 in doors, or widening several existing doors, plus remote distribution and swing/panic-hardware upgrades.
• Achieving that in an existing wall line is usually more expensive than sprinklers and does nothing for travel distance.

Recommendation: sprinklers. The change of occupancy already triggers egress upgrades; buying capacity at 0.2 in per person solves the capacity, travel-distance and exit-separation issues in one move and is the lowest-risk path for a crowd of 600 eating and drinking in an unfamiliar room.