Precision Property Measurements is a team of dedicated service professionals, providing full service building measurement, surveying and CAD drafting services. This page provides handouts for the different applications submitted to the Building Division.We offer complete Construction Drafting services from the initial design phase to the Permit process. Grading and Right-of-Way Permits. The Building Services Division processes building permits for structures in unincorporated areas of San Diego County. Prepare Your Plans: You'll need to submit detailed plans for your project, including architectural drawings, site plans, and any necessary engineering reports. Do you want to build a custom home but not know where to start? Decide if pre approved ADU plans are the right choice for your project. Understand how pre-approved plans work and what they will save. Building Permit Required: All ADUs need a building permit. 2.