Determine ADU development goals, wants, and needs as well as target demographics if ADU to be utilized for income 

Review City/County Data - zoning report, transit report, pedestrian factors, walkability

Review Legal Description for lot lines/boundaries. Find any existing survey information, determine easements

Measure setbacks from lot lines/other buildings

Obtain floorplan for primary residence if needed

Establish utility paths – sewer/water access challenges

Determine electrical access

Determine fixture count

Determine access for eventual tenant and construction

Determine impervious surface and open space requirements

Assess for parking (whether required or not based on need/transit proximity)

Determine sun/exposure, views

Determine trees and bushes to remove/mitigate as well as fences and other obstacles

Take photographs of site, primary residence, parking, etc

Review financial options and financing referral