Denver adopts the 2021 International Building Code with Colorado amendments. The City and County of Denver Department of Community Planning and Development manages permits with typical timelines of 2-8 weeks. The city has a population of approximately 715,522 and covers 155 square miles. Denver is at 5,280 feet elevation with specific design requirements for high altitude. The city is in Seismic Design Category B requiring moderate seismic design. Notable requirements include air quality considerations, stormwater management with green infrastructure focus, and historic preservation in Capitol Hill and LoDo districts. Permit fees range from 0.5-0.8% of construction value. The city offers expedited processing for sustainability-certified projects and has established design standards for downtown development.