Do I need a code compliance review before a change of use?

What a change of occupancy triggers

Occupancy classification drives nearly everything in the code. Move from B (business) to A-2 (assembly, including restaurants) or from S-1 (storage) to F-1 (factory) and the following are all back in play:

• Exiting - occupant load recalculation, number and width of exits, exit separation, panic hardware
• Fire protection - sprinkler requirements, alarm and notification, fire-resistance ratings and separations, hazardous material limits
• Mechanical - outside air ventilation rates, exhaust for kitchens and processes, makeup air
• Accessibility - CBC Chapter 11B path of travel, restrooms, parking, signage; California's 20 percent path-of-travel spending rule applies to alterations
• Energy - Title 24 requirements for altered systems, lighting and controls
• Planning and zoning - permitted use, parking ratio, conditional use permit, hours and noise conditions
• Structural - increased live loads for storage or assembly, roof loads for new equipment

The two failures that cost the most

First, accessibility. An alteration permit triggers path-of-travel obligations, and buildings from the 1970s and 1980s rarely have compliant parking, entries or restrooms. Second, occupant-load-driven fire protection: a restaurant conversion in an unsprinklered building can require a full sprinkler system and a fire service upgrade, which is six figures before you buy a single piece of equipment.

What a pre-closing review produces

We compare the existing certificate of occupancy and permit record to your intended use, identify which code triggers apply, flag the conditions the plan checker will require you to correct, and estimate the cost so it lands in your underwriting rather than your change orders. Where interpretation matters, we recommend a pre-application meeting with the jurisdiction, because the plan checker's reading is the one that governs.

Timing

Do this during due diligence, not after closing. The cost of a code review is a fraction of the cost of discovering that your planned use requires a conditional use permit the city has denied twice, or that the building's parking count cannot support an assembly occupancy at all.

Special cases worth naming

Cannabis, childcare, medical and educational uses carry additional state and local requirements. Unpermitted existing work must be legalized before any new permit issues, which routinely surfaces mezzanines and offices built inside warehouses without permits. Historic buildings may require design review, which adds months.