Unincorporated Jefferson County moved to the 2024 Jefferson County Building Code for permits filed on or after July 1, 2026. Roof repairs under 25% of the roof and no more than two squares are permit-exempt; everything else is permitted, tear-off only (no overlays), with a mandatory mid-roof inspection at 10-25% complete — photo documentation not accepted.

Code edition	2024 Jefferson County Building Code for permits applied for on or after July 1, 2026 — one of four surveyed jurisdictions that changed codes in mid-2026.
Permit	Repairs under 25% of the total roof area and not more than two squares (200 sq ft) are exempt. Each separate structure — detached garage, shed — needs its own permit.
Tear-off & materials	One layer of asphalt shingles only, no overlays. Drip edge at eaves and gables; ice barrier required for asphalt shingles and most steep-slope coverings; wind resistance per ASTM D7158 (G or H) or D3161 (A, D, F).
Inspections	Mid-roof inspection required at 10-25% complete, plus final. Photo documentation is not accepted — an inspector visits. Class A assemblies required in the wildland-urban interface overlay.

Details to confirm with the county

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

• Lakewood, Arvada, Golden, and other incorporated cities permit through their own building departments — their rules differ.

Verified July 2026 · Source: Jeffco Building Safety — Important Notice on Roofing (July 1, 2026)