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Millbrae Regulations

Updated: Nov 25, 2024


BACKYARD OFFICE REQUIREMENTS

Permit Restrictions

  • No planning or building permits are required when the total square footage is < 120 square feet

  • Overhang and deck are counted in the total square footage

  • The addition of electricity will require an electrical permit

  • No permit is needed for the addition of a slab foundation (if needed)

Height and Setback Restrictions

  • Maximum height: 12 feet (measured from grade to roof ridge)

  • Separation restrictions:

    • 5 feet from the side or rear property line

    • 10 feet from any previous dwelling unit





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