Adopted edition
IRC 2021
Local amendments override state floor.
CO · County
Arapahoe County, CO.
Arapahoe County is in CO (IECC zone 5B, design wind 85 mph).
Design wind speed
85 mph
ASCE 7 Risk Cat II, 3-second gust at 33 ft. Drives fastener spacing, hold-downs, and opening protection.
Climate zone (IECC)
5B
Drives R-value, fenestration U-factor, and air-leakage envelope rules.
Special zones
- HVHZ
- WBDR
- WUI
- FEMA SFHA possible
Permit office
Arapahoe County County Building Department
Local conditions
- County seat: Littleton
Common amendments + overlays
What's specific to this county.
- §01 WUI overlay — fire-resistant exterior + defensible space requirements.
- §02 County has local amendments to the state floor — consult the building department.
Working in Arapahoe County?
Pull an address-level code packet for any property in Arapahoe County. SkyCanvass resolves the parcel, looks up the adopted edition + the Arapahoe County-specific amendments listed above, and emits a cited packet ready for permit submittal.
See the Colorado state overview for the broader context, or browse the state directory.
Pull a Arapahoe County code packet.
Free to start — property lookups, state code access, the hail map, and your first storm report on us. No credit card required to look up an address.