Denver Fire Code: Permits, Hot Work, and Violations

The Denver Fire Code is the city’s locally amended version of the 2024 International Fire Code, adopted as the 2025 Denver Fire Code and in effect since December 31, 2025.¹ It sets the permit, system, and maintenance rules that the Denver Fire Department’s Fire Prevention Division enforces across commercial buildings, multi-family housing, and a long list of regulated activities. Denver’s local amendments go well beyond the base international code, especially for high-rise buildings, cannabis extraction, and emergency responder radio coverage, so working from the ICC publication alone will leave gaps.

The 2025 code was formally adopted by the City and County of Denver on June 13, 2025 and incorporated into the Denver Revised Municipal Code by reference.² When a Denver amendment conflicts with the base 2024 IFC, the local amendment controls. The complete amended document is published separately by Community Planning and Development.³ All new permit applications must now meet the 2025 edition.

What the Code Covers

Commercial buildings, assembly venues, institutional facilities, and multi-family residential buildings all sit squarely within the code’s reach. So do several things people don’t always expect.

Tents and canopies larger than 400 square feet require fire department review and permitting, and they can only remain up for a maximum of 180 days within any 12-month period.⁴ Tent fabric must meet NFPA 701 flame-propagation testing.

Facilities that store, handle, or produce hazardous materials must develop management plans documenting how those materials are organized and what happens if something goes wrong.⁵ Hot work, large public assemblies, high-piled storage, and indoor pyrotechnics each need separate operational permits.

Cannabis extraction is treated as a regulated fire-code activity. Any facility using solvents needs both construction and operational permits before starting work. Modifications to approved processes, equipment, or solvents require a new submittal, including an engineering report signed and sealed by a Colorado-licensed design professional.⁶ Plan review for a modification runs $100. If the change also triggers building-department work like new electrical circuits or exhaust hoods, submit both at the same time so fire review happens concurrently.

Fire Protection Systems You May Be Required to Install

Which systems you need depends on occupancy type, size, and height. Most new commercial and multi-family projects end up with some combination of sprinklers, alarms, smoke control, and emergency responder radio coverage.

Sprinklers

Sprinklers are required in most new commercial and multi-family construction. Denver layers on local requirements. When two or more adjoining townhouse units share a single monitored sprinkler system, each unit must have its own isolation valve, tamper switch, and separately annunciated water-flow detection at the fire alarm panel.³ Repair garages over 3,000 square feet that use open flame or welding also need sprinklers, as do repair garages with spray booths larger than 16 square feet using flammable finishes.

Hydraulic calculations must use water supply data from Denver Water obtained within the last 12 months. Domestic water service cannot supply automatic sprinklers, with limited exceptions.

Fire Alarm Systems

Fire alarm systems must be zoned, with each floor on its own zone, and no zone may exceed 22,500 square feet or extend more than 300 feet in any direction.⁷ Buildings with emergency voice/alarm communication systems must house those systems in a fire command room. Emergency exit signage and illumination must stay functional during total power failure through battery backups or emergency generators.

Smoke Control

Installing or modifying a smoke control system requires a construction permit covering fans, controllers, ductwork, fire and smoke dampers, annunciators, and associated controls.⁷ Even routine maintenance on smoke control equipment requires a permit. High-rises typically use stairwell pressurization with depressurization on the fire floor; very tall buildings may need stairwells subdivided into smaller vertical segments to keep pressure gradients manageable.

Emergency Responder Radio Coverage

This one catches many building owners off guard. Denver mandates approved in-building radio coverage for emergency responders in all high-rise buildings, underground buildings, and airport structures. It also extends to large new buildings based on construction type and size: Type I and II buildings over 50,000 gross square feet, educational and institutional occupancies over 12,000 gross square feet on any story, and occupiable below-ground areas exceeding 10,000 gross square feet.³

The system must operate at 806–816 MHz and 851–861 MHz, matching the Department of Safety’s frequencies. The control channel signal must exceed -100 dBm with at least 95 percent floor-area coverage on each floor and parking area. Critical areas such as fire pump rooms, stairways, elevator lobbies, standpipe cabinets, and fire command centers must hit 99 percent coverage.³ Testing uses a grid pattern with at least 10 sampling measurements per 16,000 square feet. Once installed, the system must be inspected annually by a Denver ERCES-licensed contractor, with a full witnessed re-test every five years.

Permits and How to Apply

The Fire Prevention Division issues two categories of permits. Construction permits cover permanent fire protection system installations like sprinklers, alarms, and smoke control. Operational permits authorize ongoing activities such as hazardous material storage, hot work, high-piled storage, and cannabis extraction.⁸

Applications run through Denver’s E-Permits online portal, which handles payments, contractor assignments, inspection scheduling, and results tracking. Counter permits are no longer available.⁹ As of December 2025, a 2.5 percent service fee applies to credit and debit card payments. You can avoid that fee by paying with an electronic check online or with cash, check, or money order in person.

A complete application typically includes detailed site plans showing fire hydrant locations, access roads, and building perimeters, plus system specifications prepared by qualified professionals. Contractors performing the installation need valid licensing and insurance recognized by the city. All materials submitted become public record under the Colorado Open Records Act.

Start work without the required permit, and the fee doubles automatically.³ That penalty is not discretionary.

Hot Work Rules

Cutting, welding, brazing, glass blowing, and any spark-producing process fall under the hot work policy. A permit is required, and the fire code official can revoke it if conditions are violated, written orders go unmet, or the application contained false information.¹⁰

Everything combustible must be cleared within 35 feet of the work area in all directions. A fire extinguisher rated at least 2-A:20-B:C must be within 30 feet. A fire watch is required during all hot work and must continue for at least 30 minutes after the work ends, and the fire code official can extend that window based on conditions. The responsible person must keep pre-work check reports on site for at least 48 hours after the work finishes.¹⁰

Hot work is flatly prohibited without prior approval from the fire code official in areas where sprinklers are impaired, locations with potential explosive atmospheres, areas with large quantities of loose combustibles, and spaces containing uncleaned containers that previously held flammable substances.

Ongoing Maintenance After Installation

Getting a permit and passing inspection is just the starting point. Inspectors can show up and expect to see proof of continuing compliance.

Sprinkler systems need the most attention. Control valves should be checked regularly to confirm they’re fully open with tamper seals intact. Sprinkler heads need annual visual inspections. The piping system requires internal assessments on a five-year cycle. Buildings with sprinkler installations that are several decades old face additional sample-testing requirements. These intervals follow NFPA 25, which Denver adopts as part of its code framework.

Fire doors must be inspected and tested at installation and at least annually after that, by someone with knowledge of the door’s operating components and design. The check covers 13 specific items, including label legibility, clearance gaps, missing components, and a functional test confirming the door will close and latch under fire conditions.

Emergency responder radio coverage systems require annual inspection by a Denver ERCES-licensed contractor, with a full witnessed re-test every five years conducted with DFD Line Shop oversight.³ Structural renovations that could change signal performance also trigger re-testing.

Smoke control systems, fire alarm panels, emergency lighting, and portable extinguishers each have their own inspection and testing schedules. The common thread is that the building owner bears responsibility for keeping everything operational, not just installed. An inoperable system that passed inspection two years ago provides no protection and no legal cover.

Violations and Penalties

After permit issuance and completed work, you schedule the inspection through E-Permits. A Denver fire inspector verifies the installed systems match the approved plans and tests their functionality. A successful inspection leads to final permit approval or, for new construction, contributes to the Certificate of Occupancy.

Violations carry real consequences. Anyone who violates the fire code, fails to comply, or performs work contrary to approved plans or a fire code official’s directive faces penalties as prescribed in Denver Municipal Code Section 1-13. Each day a violation continues after notice counts as a separate offense.³ That daily-offense provision is where costs escalate quickly. A problem that seems minor on day one can generate a separate penalty for every day it remains uncorrected.

False alarms carry their own penalty. Anyone who deliberately or maliciously reports a fire or hazardous materials release knowing none exists must reimburse the city for the total cost of the emergency response.³ That is the actual cost of deploying fire apparatus and personnel, not a fixed fine.

When Existing Buildings Must Be Upgraded

Existing buildings don’t automatically have to meet every provision of the latest code, but several triggers can force upgrades. A change in occupancy type is the most common. Converting office space to a restaurant changes the hazard profile and may require new or expanded fire protection systems. Significant renovations can also trigger upgrades, though the threshold depends on the scope of work and the fire code official’s determination.

Denver has imposed specific retrofit deadlines for certain systems. Existing elevators were required to comply with the code’s electrical-disconnect documentation and fire command center display requirements by January 1, 2024.⁷ When a fire alarm system can no longer be serviced or repaired to eliminate chronic nuisance alarms or impairments, the system owner must replace it. That is a code requirement rooted in NFPA 1.

Replacing a fire alarm control panel is a gray area. Some jurisdictions classify a panel swap as a new installation, which triggers full-system compliance with current code. Whether Denver treats a given project that way depends on scope and the fire code official’s interpretation. Contact the Fire Prevention Division before ordering equipment to get a clear answer on what level of upgrade you’ll face.

Appealing a Fire Code Decision

If you disagree with a fire code official’s decision, Denver has a formal appeals process through the Board of Appeals. You have 30 calendar days from the date of the decision or order to file a written appeal. For certain notices served in person or by overnight mail, the deadline shrinks to 10 calendar days.⁷

The application must be filed on the Board’s prescribed form with a non-refundable fee, at least 15 calendar days before the Board’s meeting to be heard. The Board also hears requests for alternate materials and construction methods, but only after the applicant has obtained approval or test results from an approved testing agency.⁷ A majority vote of members present decides the outcome, and the Board issues a written decision with findings of fact. If you’re still unsatisfied after the Board rules, you can seek judicial review in court.

1
City and County of Denver. Building and Fire Codes
2
City and County of Denver. 2025 Building and Fire Code Adoption Process
3
City and County of Denver. 2025 Denver Fire Code
4
City and County of Denver. Temporary Outdoor Expansions Building and Fire Permit Overview
5
Denver Fire Department. Instructions for Hazardous Materials Regulation and Permitting
6
City and County of Denver. Submittal Guideline for Extraction Master and Site-Specific Engineering Reports
7
City and County of Denver. 2022 Denver Building and Fire Code
8
City and County of Denver. Fire Safety Operational Permit Application Process
9
City and County of Denver. Welcome to E-permits
10
Denver Fire Department. Hot Works Policy