Adams County adopted the 2024 International Codes on April 21, 2026, effective July 1, 2026 — building permit applications accepted before that date are reviewed under the 2018 editions. Reroofs are permitted work; the county posts the Colorado Chapter ICC reroofing guide as its standard reference and runs permitting through its One Stop center.

Code edition in transition	2024 International Codes adopted April 21, 2026, effective July 1, 2026. Applications received before July 1 are reviewed under the 2018 editions — ask which edition your permit rides on.
Permit	Reroofs require a permit; the county's posted standard is the Colorado Chapter ICC single-family reroofing guide.
Contact	One Stop Permitting Center, (720) 523-6800 — the authoritative answer on thresholds while the county's post-code-switch roofing documents settle.

Details to confirm with the county

We couldn't confirm the following from Adams County's official pages. Check these with the county before you rely on them:

• The county's detailed residential roofing requirements sheet was retired in its website migration around the 2026 code switch — current permit-exemption thresholds and layer rules should be confirmed with the One Stop center.
• Thornton, Westminster, Commerce City, and Brighton permit through their own building departments — their rules differ.

Verified July 2026 · Source: Adams County — Codes & Information