Required Documents

Plumbing Permit Required Documents in Los Angeles

What documents does LADBS require for a Los Angeles plumbing permit application?

Documents Needed for a Los Angeles Plumbing Permit

Plumbing permit applications in Los Angeles require documentation describing the plumbing work to be performed. LADBS uses this information to verify compliance with the California Plumbing Code before issuing the permit. Submitting complete documentation avoids delays from correction requests.

Basic Information Required for All Plumbing Permit Applications

• Property address and assessor parcel number (APN)
• Description of plumbing work (type of work, fixtures involved, pipe materials)
• Number and type of plumbing fixtures being installed or modified
• Applicant information (property owner or CSLB licensed contractor)
• CSLB C-36 plumbing contractor license number for commercial projects
• LADBS plumbing permit application form

Equipment Specifications

• Water heater manufacturer specifications including BTU input rating, energy factor (EF or UEF), and

tank size

• Tankless water heater specifications including flow rate and minimum inlet temperature
• Backflow prevention device manufacturer specifications
• Pump and ejector specifications for drainage pump systems
• Gas appliance specifications if gas piping is involved

Plans Required for Plan Check Projects

Projects requiring a formal LADBS Plumbing Plan Check must submit plumbing plans and calculations:

• Plumbing system plan showing fixture locations and pipe routing
• Drainage fixture unit (DFU) calculation schedule
• Isometric diagram of the drain, waste, and vent (DWV) system
• Water supply system design with pipe sizing calculations
• Gas piping system diagram with sizing calculations
• Cleanout location plan
• Backflow prevention device specification and location plan

Sewer Connection Documentation

Projects involving new or modified connections to the city sewer require coordination with the Bureau of Engineering. Required documents may include a Bureau of Engineering S-Permit application, sanitation fee receipt, and for hillside or complex properties, a civil engineer-stamped sewer lateral plan.

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