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Among its many technical updates to Utah's building codes, H.B. 415 adds a key rule stating that when someone renovates, adds onto, or repairs an existing building, they are not required to bring the entire structure up to current new-construction standards — unless the work itself creates a condition that is less safe than what existed before. The bill also makes dozens of other specific code changes, including adjustments to fire sprinkler requirements, stair dimensions, snow load tables, egress window rules, and energy storage system signage.