How deep do footers need to be?

The depth of footers typically depends on several factors, including local building codes, soil conditions, and the type of structure. Generally, footers should be at least 12 to 24 inches deep, but in colder climates, they may need to extend below the frost line, which can be 36 inches or more. It's essential to consult local regulations and a structural engineer to determine the appropriate depth for your specific project.