Storage Sheds & Backyard Buildings Near Prosper, TX

Outside city limits, including the ETJ: Collin County has no zoning in unincorporated areas, but it requires a Development Permit for projects that add footprint to a parcel, and it names barns and storage buildings as examples. Apply through the county's Citizen Self-Service Portal. Properties in a city's extraterritorial jurisdiction (ETJ) still permit through the county, and new construction there also needs an ETJ Verification form signed by that city. The county notes that review can take up to 30 days, so apply before you schedule delivery.

A few county rules worth knowing: structures can't be built in drainage easements, residential structures aren't allowed in the floodplain, and addresses are only assigned through permitting. If the building will connect to septic, the on-site sewage facility (OSSF) review runs through the same development permit. Collin County Development Services is at (972) 548-5585.

Inside the Town of Prosper: the Unified Development Code (May 2026) exempts accessory structures under 200 sq ft from a building permit, though the town's homeowner page still lists sheds as needing one, so confirm with Building Inspections (972-346-3502). Setbacks are 3 ft on the side when the building is at least 10 ft from the house (15 ft along a side street) and 3 ft at the rear, or 10 ft with no alley. Buildings over 160 sq ft may use vinyl, fiber cement, or factory-coated metal with walls of 14 ft or less when design conditions are met, and no accessory building may be taller than the house. Town zoning does not apply in the ETJ. The town does not enforce HOA rules, which may be stricter.