At the very minimum for any addition of living space you will need to have:
A Site Plan; Showing the property lines, required set backs from the property lines and outlines of all structures on the property,
all easements (utilities, access, streets etc. Many different notes such as who prepared the plans, the type of construction,
pertinent codes etc. plus a description of the work to be performed.
Floor Plan; Showing dimensioned exterior and interior walls, doors, windows, room usages and sizes, natural light and ventilation,
stairs, hallways, bathrooms with plumbing fixture locations, etc.
Roof Plan: Showing ridges, valleys, hips, slopes and over-hangs and attic vent locations and calculations for venting.
Building elevations; Showing all exterior doors, windows, materials roof lope and roof materials, etc.
Building Cross Sections; Showing framing construction, plate heights, exterior and interior finishes and materials, etc.
Foundation Plan; Showing sizes and widths, thicknesses and re-enforcing materials and any special anchoring, etc.
Framing Plans; This is very often done by a licensed engineer if required or I can do and have done "prescriptive" framing
design and details as prescribed by the California Residential Code if the project warrants.
Structural Connection Framing Details; Showing connections of walls to roofs, foundations and floor to floor.
California Energy Compliance Requirements; This will include the CF-1R, MF-1R, Ws-5R and Ws-4R forms where required.