Accessory Structures in Centennial, CO (2026)
4 verified accessory structures rules for Centennial, Colorado, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Centennial approved ADU regulations unanimously in 2024. Interior ADUs are limited to 50% of the primary residence. Detached ADUs cannot exceed 800 sq ft. ADUs must match the primary home's design. Under HB 24-1152, owner occupancy cannot be required, and STRs in ADUs are prohibited except in PUDs.
Centennial ADU (Accessory Dwelling Unit) Rules
Some RestrictionsShed Rules
Centennial regulates accessory structures through the Land Development Code. Small sheds typically do not require building permits but must comply with setback requirements. Structures over 50 sq ft in certain districts require screening with a 6-foot fence. HOA approval may also be needed.
Centennial Shed & Accessory Structure Rules
Few RestrictionsGarage Conversions
Centennial permits garage conversions as a form of ADU under its 2024 ADU ordinance and Colorado HB 24-1152. Conversions require building permits and must meet residential code including 7'6" ceiling height. Under state law, cities should not require replacement parking for garage-to-ADU conversions.
Centennial Garage Conversion Rules
Some RestrictionsCarport Rules
Centennial regulates detached carports under Land Development Code Section 12-3-603 as accessory structures. Detached carports serving attached single-family or multifamily dwellings must be set back at least 20 feet from a building setback line on adjacent lots of a different dwelling type. General accessory structures have 5-foot rear and interior side setbacks and a 17-foot height cap.
Centennial Carport Rules
Some RestrictionsLooking for Arapahoe County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Centennial city rules.
Accessory Structures in Arapahoe County →