In general, most warehousing projects now require some sort of permitting or documentation. There are two parts to the typical pallet rack permit. First, there is the High Pile Permit. The documentation needed is normally provided by your architect. They take the rack rack layout and provide a design showing that egress aisles, emergency lighting, and the fire suppression system is adequate for the products and type of rack being used.
The other half of the permit process is the structural portion. Usually, a P.E. will evaluate the rack design, review the slab specifications of the building, and seismic conditions. A stamped copy will be submitted with the permit application.
In some cities, they will run the High Pile and structural permit together. Others will not even accept the general rack permit application without first getting the High Pile permit.