Direct answer
The number follows security objectives and coverage, not square footage. Start with approach paths and choke points: entrances, driveway, garage, side gates, accessible rear doors, and routes connecting outdoor areas. Give every camera a purpose, such as facial identification, vehicle observation, package coverage, or general context.
A wide overview may show an incident without capturing enough detail to identify anyone. Placement must account for height, lens, target distance, lighting, backlighting, nighttime reflections, landscaping, and overlapping views. Avoid private interior spaces and unnecessary views into neighboring private areas. Test actual recorded day and night footage, retrieval, and export—not only live thumbnails. A professional plan should document every view and calculate storage from the selected recording settings.
How this answer was prepared
Camelback Smart Homes publishes this FAQ library for homeowners, design professionals, builders and property teams comparing integrated technology. Answers begin with the practical conclusion, then explain the factors that can change it.
Limitations: This is general educational information, not a site-specific design, quote, code determination or compatibility guarantee. Final requirements depend on the property, construction, infrastructure, equipment versions and project goals.