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Permitting Authorities / Colorado / Boulder County - Community Planning & Permitting

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

Adopted code

Boulder County - Community Planning & Permitting

Yes, a permit is required to replace a roof in Unincorporated Boulder County, CO, issued by Boulder County - Community Planning & Permitting. Re-roofing is an alteration that requires a building permit in unincorporated Boulder County. Incorporated cities and towns within the county permit separately, so verify jurisdiction by address. Colorado has no statewide roofing contractor license.

Roof code checklist: Unincorporated Boulder County, CO

ItemAnswerCode citeSourceVerified
Permit to replace a roofYesbouldercounty.gov2026-07-12
Repair permit thresholdPublishedcpp-boulder-county-building-code-...2026-08-13
Layer limit / roof-overNot published
Deck & sheathingNot published
Drip edgeYesbouldercounty.gov2026-07-18
Ice & water shieldYesR905.1.2cpp-boulder-county-building-code-...2026-08-13
Mid-roof inspectionNobouldercounty.gov2026-07-18
Impact-resistant (Class 4) roofingYesSec. 1504.8.1cpp-boulder-county-building-code-...2026-08-13
Wind design criteriaPublishedcpp-boulder-county-building-code-...2026-08-13
Adopted codePublishedcpp-boulder-county-building-code-...2026-08-13
Contractor license / registrationNot published
Sales & use taxPublishedbouldercounty.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
Boulder County, Colorado (unincorporated)
Jurisdiction type
county
Address
Boulder, CO
Contact
  • url: https://bouldercounty.gov/property-and-land/land-use/building/
Permit portal
Permit portal
Roofing permit required
Required
Permit process note
Re-roofing is an alteration that requires a building permit in unincorporated Boulder County. Incorporated cities and towns within the county permit separately, so verify jurisdiction by address. Colorado has no statewide roofing contractor license.
Adopted code
2021 editions of the International Codes with Boulder County amendments, adopted by Resolutions 2025-012 and 2026-020 and effective July 1, 2026. The amendment instrument adopts the 2021 IBC, IRC, IEBC and companion codes by reference and repeals the 2015 editions on that date.
Drip edge
Required About drip edge
Ice & water shield
Required — County climatic/geographic design-criteria table: "ICE BARRIER UNDERLAYMENT REQUIRED = YES. In accordance with Sections R905.1.2, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and R905.8.3.1, where there has been a history of local damage from the effects of ice damming, ice barrier is required." Boulder County's official determination applies this trigger countywide (no elevation threshold). About ice & water barrier
Mid-roof inspection
Not required
Impact-resistant roofing
Required — Boulder County Building Code Amendments, Resolutions 2025-012 and 2026-020, effective July 1, 2026, IBC section 1504.8.1: "Asphalt shingles shall be Class 4 impact resistant, tested in accordance with UL 2218, and installed in accordance with the manufacturer's installation instructions." The parallel residential amendment is IRC section R905.2.4.2. Exception: if the roof repair, roof replacement, roof recover or new roof area of an addition is no greater than 200 square feet and no greater than 25% of total roof area, the owner may request a code modification from the Building Official (requires a written statement from a roofing contractor or supplier that no matching Class 4 shingles are available). The County's Building FAQ states the same requirement in the same terms. This amendment first appears in the County's March 31, 2025 amendment round; the 2009 and June 6, 2022 rounds contain no impact-resistance provision. The County's amendments apply in unincorporated Boulder County; cities and towns within the county adopt and enforce their own building codes independently.
Repair permit threshold
Permit exempt: "Roof covering repair, shingle repair or replacement, not exceeding one square (100 square feet of area) (9.29 m2) of covering per building or structure." (Section 105.2, Work exempt from permit, item 16)
Wind design criteria
Table R301.2(1) as amended: "WIND DESIGN / WIND SPEED = Varies. The references from the basic wind speed map Figure R301.2(2) are replaced by the Boulder County map, 'Boulder County Wind Speed Map,' as amended. Wind exposure category shall be determined on a site-specific basis in accordance with Section R301.2.1.4." "TOPOGRAPHIC EFFECTS = No." "SPECIAL WIND REGION = YES, in accordance with Figure R301.2(2), per local data, there is local historical data documenting unusual wind conditions." "WINDBORNE DEBRIS ZONE = NO." The county's Wind Speed Map (dated 1/27/2017) shows ultimate-velocity wind loads ranging from approximately 130-140 mph across the eastern-county metro belt (Boulder, Erie, Lafayette, Louisville, Superior) up to 225 mph in the high mountains of western Boulder County. The 225 mph mountain-zone figure is unusually high but reads as an intentional site-specific topographic gust value for chinook-wind terrain; it does not apply to the eastern-county metro communities. Adopted via Boulder County Resolutions 2025-012 and 2026-020 (Boulder County Building Code Amendments), effective 2026-07-01.
Sales & use tax
5.335% combined for unincorporated Boulder County (state 2.9% + county 1.335% + RTD 1% + SCFD 0.1%). The county collects a building/construction-materials use tax (1.335%) as a prepayment deposit at building-permit issuance for unincorporated-county projects.

Roof permits nearby: Boulder County

Boulder, CORoof permit Jamestown, CORoof permit Lafayette, CORoof permit Longmont, CORoof permit Louisville, CORoof permit Lyons, CORoof permit Nederland, CORoof permit Superior, 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 Boulder County. Community Planning & Permitting issues re-roofing permits and conducts inspections outside the incorporated cities and towns within the county.

Hail reports near the center of Boulder County, CO

Reports, last 24 months
0
Largest, last 24 months
None
Most recent
None in 24 months
Reports, last 5 years
4
4 most recent reports, last 5 years
DateHail sizeDistance
Jun 12, 20231.00 in9 mi SE
Jun 12, 20231.00 in8 mi SE
Oct 1, 20220.75 in9 mi ESE
Jul 27, 20221.00 in5 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 Boulder 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 Boulder 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

Free instant roof estimate — Unincorporated Boulder County, CO

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Roofing questions: Unincorporated Boulder County, CO

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

Yes, a permit is required to replace a roof in Unincorporated Boulder County, CO. Permit exempt: "Roof covering repair, shingle repair or replacement, not exceeding one square (100 square feet of area) (9.29 m2) of covering per building or structure." (Section 105.2, Work exempt from permit, item 16)

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

Yes. County climatic/geographic design-criteria table: "ICE BARRIER UNDERLAYMENT REQUIRED = YES. In accordance with Sections R905.1.2, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and R905.8.3.1, where there has been a history of local damage from the effects of ice damming, ice barrier is required." Boulder County's official determination applies this trigger countywide (no elevation threshold).

Is drip edge required in Unincorporated Boulder County, CO?

Yes.

What building code does Unincorporated Boulder County, CO use?

2021 editions of the International Codes with Boulder County amendments, adopted by Resolutions 2025-012 and 2026-020 and effective July 1, 2026. The amendment instrument adopts the 2021 IBC, IRC, IEBC and companion codes by reference and repeals the 2015 editions on that date.

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

No.