“Change of use” sounds like paperwork. In practice it is the moment a building is asked to do a different job than it was approved for, and the code responds by asking for the things that job needs. A shop and a café have different fire risks, different crowds and different plumbing, so the building department checks that the space can support the new use before it issues a permit.
Occupancy: the classification behind the label
Every space has an occupancy classification under the building code. Retail is one group; restaurants and cafés with seating typically fall under an assembly group; small take-away counters may be treated differently. When the classification changes, the code requirements that apply to the space change with it. That is the whole mechanism of a change of use, and it is why two spaces of the same size can face very different scopes.
What the new use usually asks for
Exits
Assembly uses can require more or wider exits than retail, depending on how many people the space is designed to hold. Occupant load is calculated from the floor area and the layout, which is why the seating plan matters to the permit and not just to the business.
Restrooms
The number of fixtures required depends on the use and the occupant load. A shop that got by with one restroom may need more, and they must be accessible.
Accessibility
A change of use triggers accessibility upgrades: an accessible path of travel from the public way to the entrance, the counter and the restrooms, and accessible fixtures and clearances. This is often the largest hidden scope in an older building.
Parking and Planning
Restaurants are typically assigned a higher parking requirement than retail. Depending on the zone and the city, the change may need Planning clearance or a different approval before Building will accept the permit application.
Mechanical, plumbing and the kitchen
Cooking brings a hood and exhaust, make-up air, a grease interceptor and more plumbing than a shop ever had. These are engineered items and they need room, which is why an architect looks for them during feasibility.
The process
- Feasibility: confirm the zoning allows the use, identify the occupancy change and list what it triggers.
- Design: plan the space to satisfy the new requirements while serving the business.
- Construction documents: a coordinated set covering architecture, accessibility, mechanical, plumbing and the kitchen.
- Submittal: Building plan check, the Health Department for food service, and Planning where required.
- Corrections: the reviewer’s questions, answered by the architect until approval.
- Permit, construction and inspections.
A worked example
On Beverly Boulevard, an existing retail tenant space inside a building designed by Neil Denari became an Alfred Coffee. The project was a change of use and a full tenant improvement: accessibility upgrades, space planning, a coordinated kitchen layout and approvals from both Building and the Health Department, while keeping the building’s original character intact. Read the case study.
