In general, you do not need a building permit for projects that are less than 10 feet tall and less than 200 square feet.  All construction projects, including sheds, must still meet the applicable lot coverage and yard setback regulations see below attachment.

It's always better to be safe than sorry though, so call or come in to City Hall to speak with someone in the Building Division before you start construction.  In addition, many construction projects require Planning Division design review approval prior to building permits being issued.  If your project will increase the onsite parking requirements, change the building occupancy class, or cost over $5,000 to complete, you will need to go through Planning Division design review. 

Click here to go to the Building Division's web page on this topic for more information.