Start with measured exterior and interior walls, openings, columns, stairs, ceiling heights, and fixed plumbing or electrical points. Use a consistent scale and show dimensions, door swings, circulation clearances, and furniture footprints. A drawing tool cannot confirm structure, fire safety, accessibility, ventilation, zoning, or permits. Validate the plan on site and use licensed professionals for construction documents and code review. Remove addresses, security layouts, and private household details before sharing.