This page provides handouts for the different applications submitted to the Building Division. The links below lead to interactive PDF versions of applications for building permits for projects in the unincorporated areas of the County of San Diego.You will need an architect, a structural engineer, and maybe a soils engineer as well. Also look into taxes and assesments for the property. If you are building a home in San Diego, you must submit your custom home plans for building permits. To build a home in San Diego county, you first need a street address.