Check your closing documents, deed packet, or home purchase records
Contact the architect, builder, or developer who built the house
Ask your local building department or city/county permit office
Search the county assessor or recorder’s office for filed plans
Request copies from your homeowner’s association if applicable
Contact previous owners or the real estate agent who sold the home
Review old renovation permits, inspections, or contractor records
Hire a licensed architect, draftsman, or surveyor to measure and redraw the house
Use a home scanning or floor plan service to create new plans
Check online property records or GIS portals for available documents