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Permitting Authorities / Colorado / Adams County - Building Safety Division

Do you need a permit to replace a roof in Unincorporated Adams County, CO?

Adopted code

Adams County - Building Safety Division

Yes, a permit is required to replace a roof in Unincorporated Adams County, CO, issued by Adams County - Building Safety Division. Reroofing in unincorporated Adams County requires a building permit from the Building Safety Division. Incorporated cities within the county permit separately. Colorado has no statewide roofing contractor license.

Roof code checklist: Unincorporated Adams County, CO

ItemAnswerCode citeSourceVerified
Permit to replace a roofYesadamscountyco.gov2026-07-16
Repair permit thresholdPublishedCED-Residential-Roofing-Requireme...2026-07-18
Layer limit / roof-overPublishedR908.3CED-Residential-Roofing-Requireme...2026-07-19
Deck & sheathingPublishedCED-Residential-Roofing-Requireme...2026-07-19
Drip edgeYesCED-Residential-Roofing-Requireme...2026-07-18
Ice & water shieldNoCED-Residential-Roofing-Requireme...2026-07-18
Mid-roof inspectionNoCED-Residential-Roofing-Requireme...2026-07-18
Impact-resistant (Class 4) roofingNoonline.encodeplus.com2026-08-10
Wind design criteriaNot published
Adopted codePublishedadamscountyco.gov2026-07-18
Contractor license / registrationNot published
Sales & use taxPublishedadamscountyco.gov2026-07-18

Each row comes from the sourced record on this page; full wording is in the table below. "Not published" means no official source for that item was found when the record was last verified.

Jurisdiction
Adams County, Colorado (unincorporated)
Jurisdiction type
county
Address
Brighton, CO
Contact
  • url: https://adamscountyco.gov/our-county/community-economic-development/building-safety/
Permit portal
Permit portal
Roofing permit required
Required
Permit process note
Reroofing in unincorporated Adams County requires a building permit from the Building Safety Division. Incorporated cities within the county permit separately. Colorado has no statewide roofing contractor license.
Adopted code
2024 International Codes with Adams County amendments — adopted by the Board of County Commissioners April 21, 2026, effective July 1, 2026. (The county’s July 2026 roofing handout still cites 2018 IRC in a few bullets — stale boilerplate from the changeover; the 2024 adoption controls.)
Drip edge
Required — Drip edge flashing is required at eaves and along the rake of the roof; must extend over the roof sheathing at the fascia; minimum drip edge size is 2 inches. About drip edge
Ice & water shield
Not required — "Installation of ice and water shield is not required in Adams County. If installed, it must meet the installation requirements set forth in the 2024 International Residential Code and the manufacturer's installation instructions." About ice & water barrier
Mid-roof inspection
Not required — The county's dated re-roof requirements list only two required inspections: a Sheathing Inspection (all new roof sheathing must be inspected prior to installation of roofing materials) and a Final Inspection. No mid-roof inspection is listed for standard asphalt shingle re-roofs. (An older, undated Colorado Chapter ICC "Building Guide" also hosted by the county notes a mid-roof inspection "may be required" for tile/metal/special roofs only.)
Impact-resistant roofing
Not required — Adams County's Ordinance No. 12 - the ordinance under which the Board of County Commissioners adopted the 2024 International Residential Code on April 21, 2026 (effective July 1, 2026) - was reviewed in full, including its Section 5 amendment list. Its only amendment to IRC R905.2.4 (Asphalt shingles) requires compliance with ASTM D3462 and a manufacturer's national wind warranty for the applicable design wind speed; it contains no impact-resistance, UL 2218, or Class 4 roofing requirement.
Repair permit threshold
A repair or replacement of less than one (1) square (100 sq. ft.) on any slope does not require a permit. If repair or replacement is more than one (1) square on any slope, the slope containing the damaged shingles shall be completely replaced.
Roof layer limit / recover
"The maximum number of layers of roofing permitted is one (1), per Ordinance No. 12 and amendment to R908.3 of the 2024 IRC." "The maximum number of layers on a flat roof is one (1)."
Deck & sheathing requirements
Per Adams County's Residential Roofing Requirements handout: "Asphalt shingles must be installed over solidly sheathed decks. Any spacing in plank decking that exceeds the manufactures allowance must be re-sheeted in accordance with the 2018 International Residential Code, and or the shingle manufacturers' installation instructions. All joints and seams of the new decking must break over the trusses or rafters and be secured using fasteners permitted by Table R602.3.1 of the 2018 International Residential Code." (The handout cites the 2018 IRC here even though the 2024 IRC became the controlling code on 2026-07-01 -- stale boilerplate left over from the changeover; the 2024 adoption controls.)
Sales & use tax
Unincorporated Adams County combined rate is 4.75% west of Box Elder Creek (state 2.9% + county 0.75% + RTD 1.0% + SCFD/CD 0.1%) or 3.75% east of Box Elder Creek, near DIA, where RTD/CD does not apply (state 2.9% + county 0.75%). Adams County is state-collected (not home-rule).

Roof permits nearby: Adams County

Bennett, CORoof permit Brighton, CORoof permit Commerce City, CORoof permit Federal Heights, CORoof permit Northglenn, CORoof permit Thornton, CORoof permit Westminster, CORoof permit Roofing in ColoradoState hub

Related guides

Denver-Metro Roofing Permits Filing a Hail Insurance Claim Colorado Hail Season Prep Hiring a Contractor Hail-Belt Rules by State

The building permit authority for unincorporated Adams County. Issues reroofing permits and conducts inspections outside incorporated cities such as Thornton, Westminster, and Brighton.

Hail reports near the center of Adams County, CO

Reports, last 24 months
2
Largest, last 24 months
1.75 in Jun 8, 2026
Most recent
Jun 8, 2026 1.75 in
Reports, last 5 years
9
5 most recent reports, last 5 years
DateHail sizeDistance
Jun 8, 20261.75 in9 mi W
Jun 1, 20261.50 in7 mi S
Jun 29, 20232.00 in9 mi SSW
May 10, 20232.75 in9 mi S
May 10, 20232.50 in9 mi S

Source: NOAA Storm Prediction Center severe weather database and daily storm reports (reports since the start of the current year are preliminary), within 10 miles of the center of Adams County, CO. Data through Oct 7, 2026, not updated since. A report is an observation, not a damage record.

Working an insurance claim in Unincorporated Adams County, CO? Everything on this page (drip edge, ice & water shield, inspections, Class 4 rules) formatted as a claim-ready evidence pack: verbatim ordinance quotes, code section cites, verification dates, and official source links, ready to attach to a supplement. See a real sample pack (PDF, 4 pages, free).

Code items like drip edge and ice & water shield are what adjusters ask you to document.

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Sources

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Roofing questions: Unincorporated Adams County, CO

Do you need a permit to replace a roof in Unincorporated Adams County, CO?

Yes, a permit is required to replace a roof in Unincorporated Adams County, CO. A repair or replacement of less than one (1) square (100 sq. ft.) on any slope does not require a permit. If repair or replacement is more than one (1) square on any slope, the slope containing the damaged shingles shall be completely replaced.

Is ice & water shield required in Unincorporated Adams County, CO?

No. "Installation of ice and water shield is not required in Adams County. If installed, it must meet the installation requirements set forth in the 2024 International Residential Code and the manufacturer's installation instructions."

Is drip edge required in Unincorporated Adams County, CO?

Yes. Drip edge flashing is required at eaves and along the rake of the roof; must extend over the roof sheathing at the fascia; minimum drip edge size is 2 inches.

Can you roof over an existing roof in Unincorporated Adams County, CO?

"The maximum number of layers of roofing permitted is one (1), per Ordinance No. 12 and amendment to R908.3 of the 2024 IRC." "The maximum number of layers on a flat roof is one (1)."

What building code does Unincorporated Adams County, CO use?

2024 International Codes with Adams County amendments — adopted by the Board of County Commissioners April 21, 2026, effective July 1, 2026. (The county’s July 2026 roofing handout still cites 2018 IRC in a few bullets — stale boilerplate from the changeover; the 2024 adoption controls.)

Is a mid-roof inspection required in Unincorporated Adams County, CO?

No. The county's dated re-roof requirements list only two required inspections: a Sheathing Inspection (all new roof sheathing must be inspected prior to installation of roofing materials) and a Final Inspection. No mid-roof inspection is listed for standard asphalt shingle re-roofs. (An older, undated Colorado Chapter ICC "Building Guide" also hosted by the county notes a mid-roof inspection "may be required" for tile/metal/special roofs only.)