Installation of new signs or changing the copy on existing signs requires a building permit from the Building Division (Planning Division will review the proposed signs as part of the building permit review).  Proposed signs are reviewed for compliance with Chapter 25.42 (Signs) of the Municipal Code.  There are requirements for size, number, and location on a property.

Chapter 25.42 (Sign Regulations)
Sign Review Guidelines and Submittal Instructions
Calculating Sign Height and Area