You will be asked to fill out an application to construct for your building permit. You will need to specify the type of work proposed.Create a plan of the building and current property lines to scale, which should be done in an overhead view. Obtain any necessary local agency approvals and complete all necessary plans, calculations, engineering, etc. They usually include lot dimensions for all sides of your property. Submit plans, to scale, with a sheet size of 18" X 24" to 24" X 36" and any other required documents through the Public Permit Portal. Use the Online Service Locator from the LA County Dept of Public Works to find out who services your area. California law requires that every permit applicant supply specific information and make certain declarations regarding the proposed work.