Arapahoe County provides building services primarily for unincorporated areas, while incorporated cities like Aurora, Centennial, and Englewood maintain their own independent building departments and permit portals. The county enforces specific regulations for properties within designated floodplains and wildfire hazard areas, which may require additional review by the Planning or Fire divisions.
The county enforces specific drainage and stormwater management requirements for all new construction and significant additions to ensure compliance with regional water quality standards.
How this fits with the state
The state authority here is Colorado DORA - State Electrical Board and State Plumbing Board. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.
Source · Arapahoe County Building DivisionLast verified · 05 / 2026