Phoenix does not require a building permit for a one-story detached tool or storage shed when the aggregate floor area does not exceed 200 square feet.
Utility installation requires its own permit, and zoning, setbacks, lot coverage, drainage, easements, fire separation, historic status, and use still apply.
What this tells youComputed rule answer
How precise this isComputed rule answer
Official data checkedPhoenix work exempt from permit
Next stepCheck the official shed/accessory-structure rules with your project dimensions.
No building permitOne-story detached tool or storage shed, aggregate floor area 200 sq ft or smaller
Building permitOver 200 sq ft or outside the stated use and configuration
Still verifyUtilities, zoning, setbacks, lot coverage, drainage, easements, fire separation, and historic status