Applying For My Permit Mechanical permits requiring plan review will generally be issued within ten working days. Mechanical permits without plan review are usually issued the same or the following day after receipt of the application. A copy of the issued permit will be mailed to you. Submittal Requirements Rooftop Unit Minimum Submittal Standards: This handout describes the information that must be submitted to add one or more rooftop units to an existing building. HVAC Systems Minimum Submittal Standards: This handout describes the information that must be submitted when applying for a permit to add or alter the HVAC system in an existing building. Hoods Minimum Submittal Standards: This handout describes the information that must be submitted when applying for a permit to add one or more hoods to an existing building.