Roofing work in Denver, Colorado by Peak to Peak Roofing

Denver Roofing Codes: Permits, Inspections, and Requirements

Adopted building and energy codes, permit rules, and roofing requirements for Denver, Denver County. Rows below reflect our reading of the jurisdiction's own published sources, linked at the bottom of the page.

Last checked September 2, 2026Compiled from published Denver County and city pages

Building department

Inspection line

Permit line

Official department

Denver roofing code requirements

Denver roofing code reference

Current building code

What this jurisdiction requires: 2024 IBC and IRC through the 2025 Denver Building and Fire Code. Permits issued before the effective date follow the 2021 based edition.

Current energy code

What this jurisdiction requires: 2021 IECC, adopted as the Denver Energy Code

Building permit required

What this jurisdiction requires: Yes

Other or special permits required

What this jurisdiction requires: All new roof penetrations require a permit (e.g., skylight, rooftop units,

Roof system fire rating (residential)

What this jurisdiction requires: Class A

Roof system fire rating (commercial)

What this jurisdiction requires: Class A

Minimum wind speed rating for asphalt shingles

What this jurisdiction requires: Areas east of Federal Blvd. - 115 mph min. rating

ASTM standard for wind rating

What this jurisdiction requires: D-3161 and D-7158

Requires wind nailing

What this jurisdiction requires: Per manufacturers instructions

Inspectors carry ladders for the final

What this jurisdiction requires: Yes, with one story access.

Requires midroof (in progress) inspection

What this jurisdiction requires: Tile roof require mid-roof inspection at 30% complete. All other materials are only required if identified in a pre-inspection.

Requires a sheathing / decking inspection

What this jurisdiction requires: No

Maximum layers of asphalt shingles permitted

What this jurisdiction requires: One layer

Maximum layers of flat roof material permitted

What this jurisdiction requires: Two layers permissible, must tear off down to deck.

Requires drip edge

What this jurisdiction requires: Required

Minimum drip edge size

What this jurisdiction requires: Minimum 2" overlap for segments, extend a minimum of 1/4" below roof sheathing and a minimum of 2" onto roof deck.

Requires rake / gable metal edging

What this jurisdiction requires: Required

Self adhering underlayment (ice and water shield)

What this jurisdiction requires: Ice barrier required at eaves per the IRC

Underlayment required 2:12 up to 4:12

What this jurisdiction requires: Two layers of underlayment

Underlayment required 4:12 and above

What this jurisdiction requires: One layer of underlayment

Rolled roofing allowed on low slope over living space

What this jurisdiction requires: Yes

Type of valleys allowed

What this jurisdiction requires: Both, no closed valleys with metal liner.

Valley material required for closed valleys

What this jurisdiction requires: Closed valleys shall be a minimum of 36" wide of either 1) one ply of smooth roll roofing or 2) self-adhering modified bitumen. Metal is not allowed in a closed valley.

Valley material required for open valleys

What this jurisdiction requires: Open valleys lined with metal shall be a minimum of 24" wide and corrosion resistant. Open valleys lined with two plies of rolled roofing shall be permitted where the bottom layer is at least 18" wide and the top layer is at least 36" wide.

Kick-out required on step flashing

What this jurisdiction requires: Required where the roof meets a wall

Chimney cricket requirement

What this jurisdiction requires: All vertical projections on sloped roofs greater than 30" require a cricket or saddle made of sheet metal or of the same material as the roof covering.

Minimum curb height requirement

What this jurisdiction requires: 8"

Requires ridge cap

What this jurisdiction requires: Required, installed to manufacturer specifications

Requires ventilation to meet code

What this jurisdiction requires: Yes on new construction only

Blower door test when increasing ventilation to code

What this jurisdiction requires: Required on new construction under the Denver Energy Code

Requires soffit / eave vents

What this jurisdiction requires: Required per IRC attic ventilation provisions

Special conditions

What this jurisdiction requires: Class of roofing depends on the building's type of construction per the IBC/IRC

Requirement	What this jurisdiction requires
Current building code	2024 IBC and IRC through the 2025 Denver Building and Fire Code. Permits issued before the effective date follow the 2021 based edition.
Current energy code	2021 IECC, adopted as the Denver Energy Code
Building permit required	Yes
Other or special permits required	All new roof penetrations require a permit (e.g., skylight, rooftop units,
Roof system fire rating (residential)	Class A
Roof system fire rating (commercial)	Class A
Minimum wind speed rating for asphalt shingles	Areas east of Federal Blvd. - 115 mph min. rating
ASTM standard for wind rating	D-3161 and D-7158
Requires wind nailing	Per manufacturers instructions
Inspectors carry ladders for the final	Yes, with one story access.
Requires midroof (in progress) inspection	Tile roof require mid-roof inspection at 30% complete. All other materials are only required if identified in a pre-inspection.
Requires a sheathing / decking inspection	No
Maximum layers of asphalt shingles permitted	One layer
Maximum layers of flat roof material permitted	Two layers permissible, must tear off down to deck.
Requires drip edge	Required
Minimum drip edge size	Minimum 2" overlap for segments, extend a minimum of 1/4" below roof sheathing and a minimum of 2" onto roof deck.
Requires rake / gable metal edging	Required
Self adhering underlayment (ice and water shield)	Ice barrier required at eaves per the IRC
Underlayment required 2:12 up to 4:12	Two layers of underlayment
Underlayment required 4:12 and above	One layer of underlayment
Rolled roofing allowed on low slope over living space	Yes
Type of valleys allowed	Both, no closed valleys with metal liner.
Valley material required for closed valleys	Closed valleys shall be a minimum of 36" wide of either 1) one ply of smooth roll roofing or 2) self-adhering modified bitumen. Metal is not allowed in a closed valley.
Valley material required for open valleys	Open valleys lined with metal shall be a minimum of 24" wide and corrosion resistant. Open valleys lined with two plies of rolled roofing shall be permitted where the bottom layer is at least 18" wide and the top layer is at least 36" wide.
Kick-out required on step flashing	Required where the roof meets a wall
Chimney cricket requirement	All vertical projections on sloped roofs greater than 30" require a cricket or saddle made of sheet metal or of the same material as the roof covering.
Minimum curb height requirement	8"
Requires ridge cap	Required, installed to manufacturer specifications
Requires ventilation to meet code	Yes on new construction only
Blower door test when increasing ventilation to code	Required on new construction under the Denver Energy Code
Requires soffit / eave vents	Required per IRC attic ventilation provisions
Special conditions	Class of roofing depends on the building's type of construction per the IBC/IRC

Last checked September 2, 2026. This reflects published sources at that date, not an official ruling. Code adoptions change, so confirm with the Denver building department before you pull a permit.

What Denver requires, in plain language

Denver builds to the 2024 IBC and IRC through the 2025 Denver Building and Fire Code. Permits issued before the effective date follow the 2021 based edition.. That edition, not the newest code published nationally, is the rulebook an inspector in Denver County holds your roof to. Energy work on the same permit follows the 2021 IECC, adopted as the Denver Energy Code.

Layer limit in Denver: One layer. This is the line item that moves a bid the most. If your existing roof is already at the limit, the deck gets stripped before new material goes down, and the labor plus dump fees belong in the written price. Flat roof sections are capped at Two layers permissible, must tear off down to deck..

Wind is what Denver tests shingles against. Shingles need a Areas east of Federal Blvd. - 115 mph min. rating rating. Rating is proven under D-3161 and D-7158. Wind nailing: Per manufacturers instructions.

Underlayment and edge metal are where roofs fail inspection. Ice and water shield: Ice barrier required at eaves per the IRC. On 2:12 to 4:12 slopes: Two layers of underlayment. On 4:12 and steeper: One layer of underlayment. Drip edge: Required. Minimum drip edge size Minimum 2" overlap for segments, extend a minimum of 1/4" below roof sheathing and a minimum of 2" onto roof deck..

Denver worked under the 2022 Denver Building and Fire Code, based on the 2021 I-Codes. On June 13, 2025 Denver adopted the 2025 Denver Building and Fire Codes, which incorporate the 2024 I-Codes with the energy code staying on the 2021 IECC, effective December 31, 2025. Confirm the effective edition for your permit date.

Installation details above come from our building department field survey for Denver, last updated 9/1/18. Code editions and contacts are refreshed from the department directly. Always confirm the details on your permit before work starts, since departments amend requirements on their own schedule.

Code compliant roof installation near Denver, Colorado

Sources

These links go straight to the jurisdiction, so you always have the real-time source. Adoptions and amendments change on their schedule, not ours. Always confirm before permitting.

Keep going

Roof Replacement Roof Inspection Roof Leak Repair Insurance Claims

Nearby jurisdictions

Arapahoe County Arvada Aurora Centennial Douglas County and Highlands Ranch Englewood

Last checked September 2, 2026. This is our best read of published sources, not an official ruling. Confirm with the Denver building department before you pull a permit.