Buying a stock ADU plan gives you a powerful head start, but it is important to understand the difference between architectural construction documents and the complete set of local approvals that may be required to build.
Floor plans
Dimensioned floor plans typically show room layouts, walls, doors, windows, fixtures, and important building dimensions.
Exterior elevations
Elevations show how each side of the finished structure is intended to look, including roof forms, openings, exterior materials, and major vertical dimensions.
Building sections
Sections provide additional information about the vertical relationship between floors, ceilings, roof systems, foundations, and other construction elements.
Foundation information
Foundation information varies by plan and package. Some designs may support multiple foundation approaches while others may require modification or local engineering.
Roof information
Plan sets commonly provide roof geometry and information needed to understand the intended roof configuration.
Electrical information
Many residential plan sets include a basic electrical layout showing anticipated fixtures, outlets, switches, and related locations.
What may need to be handled locally
The exact requirements depend on the property and jurisdiction. A stock plan should not automatically be assumed to include every document needed for permitting.
Site plan
Survey
Structural engineering
Energy-code documentation
HVAC design
Septic design
Utility coordination
Soil or geotechnical information
Jurisdiction-specific revisions
Permit applications and fees
Project requirements vary.
Best ADU Plans provides general educational information. Zoning, building codes, engineering, permitting, utilities, and property conditions should be verified for the specific project and jurisdiction.