County staff propose measured adoption of 2024 building and energy codes and IBHS home‑hardening for high‑risk areas

Coconino County’s community development team laid out a tentative code adoption plan on March 3 that would update the county’s building regulations to the 2024 International Code Council suite, adopt the 2023 National Electric Code and introduce an IBHS‑based home hardening baseline for new construction in high wildland‑urban interface areas.

Director Jay Christelmann said the county must adopt updated building codes periodically to maintain life‑safety standards tied to insurance ratings and evolving materials and technology. Staff proposed a parcel‑specific approach that overlays federal wildland‑urban interface maps and climate (snow‑load) zones so requirements apply only where risk or climate data justify them.

For wildfire mitigation the county is considering the IBHS baseline elements for new construction in higher‑risk interface areas: Class A roofing with non‑combustible or guarded gutters, 1‑inch mesh over vents and openings, non‑combustible decking within 5 feet of structures, a 5‑foot combustable‑free zone, and related clearances. Staff estimated incremental costs for a model 1,600‑sq. ft. home in Flagstaff could range from roughly $6,500 to $8,500 depending on components; supervisors asked staff to produce additional benchmarking and to pursue state/federal grant avenues for existing homeowners.

On energy code adoption staff proposed a short, prescriptive 5‑element package — window/door fenestration U‑factor and insulation upgrades, foundation slab R‑value increases, duct leakage testing, targeted air‑sealing (caulking), and higher furnace efficiency — intended to meet the 2024 IECC's minimums while limiting complexity for owner‑builders and off‑grid construction. Staff will hold the statutory open house on March 23 and a follow‑up work session for the board in May before any ordinance adoption is scheduled.