fireman at night

​Fire-Related Permits, Codes & Inspections

The Fire Prevention Division is responsible for the enforcement of city of Thornton laws, codes, and ordinances, including the International Fire Code and nationally recognized standards. Through plan review, inspections, meetings with citizens and design professionals, and continuing education, the Prevention staff works toward the protection of life and property from the effects of fire.

Plan Review

Once you have all of the information gathered for a complete submittal package the application and plans can be submitted electronically.  Refer to the Submittal Requirement links on the right hand panel for more information.

The amount of time to process and review a plan from the initial submittal date to the completion of the first review (the turn around time) will vary with the type of project. Delays may occur due to high volume of applications.

  • New Commercial -  18  working days or less
  • Commercial Tenant Improvements & Remodels - 13 working days or less
  • New Residential except multifamily - 13 working days or less
  • Residential Remodels and Misc. - 8 working days or less

Please call 303.538.7007 to set up inspections. We appreciate your patience at this time.

***To submit plans for a permit, please use the City View Portal link to the right***


There are several different types of permits that are required by the Fire Prevention Bureau, they include but are not limited to the following. Please Note:  The forms and documents on this page are all in PDF format.

  • Automatic Fire Sprinkler System 
  • Kitchen Hood Extinguishing System
  • Spray Booth Extinguishing System
  • Fire Alarm System
  • Sprinkler System Monitoring
  • Other Fire Suppression Systems
  • Tank Installation Removal
  • Propane Exchange
  • Tent/Canopy
  • Recreational Fire/Burn

Adopted Codes as of June 1, 2023

Code Edition
International Fire Code 2021       
Thornton Fire Code Amendments          2021
International Building Code 2021
International Plumbing Code 2021
International Mechanical Code 2021
International Fuel Gas Code 2021
International Residential Code 2021
International Existing Building Code 2021
National Electric Code 2020
International Energy Conservation Code 2021
Standard for the Installation of Sprinkler Systems (NFPA 13) 2022
Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes (NFPA 13D) 2022
Standard for the Installation of Sprinkler Systems in Residential Occupancies up to and Including Four Stories in Height (NFPA 13R) 2022
Standard for the National Fire Alarm and Signaling Code (NFPA 72) 2022
Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems (NFPA 25) 2011

Business Fire Inspection Information

Thornton Fire Department personnel visit businesses each year to perform a routine annual or biannual Fire Safety Survey. The purpose of the survey is to verify that the use and maintenance of buildings comply with the important fire and life safety requirements of the International Fire Code, as adopted by the City of Thornton. Special attention is given to hazards that pose a serious fire and life safety threat to buildings, its occupants and its neighbors. The survey also provides firefighters with the opportunity to become familiar with buildings and businesses in order to respond to an emergency in a fast, safe and efficient manner.

Attached is a short list of common hazards and special items that are checked during the survey. The survey may reveal that a business has additional requirements. We ask businesses to take the time to make sure all of these items have been addressed so that the surveys are quick and informative. The Thornton Fire Department personnel conducting the survey can answer any questions that a business owner may have.

Remember, compliance with International Fire Code requirements is mandatory and contributes toward the goal of making the City of Thornton a safer place to live and work by reducing the loss of life and property from fire. Most hazards, when identified, will need to be addressed in a short time depending on the severity of the hazard(s). The Thornton Fire Department will make every effort to work with all businesses toward compliance. However, Fire Code violations are illegal, and serious violations or the need for repeated follow-up surveys may result in a criminal summons being issued for violation of the International Fire Code.

***Explanation of the change in annual inspections for 2020***


The Thornton Fire Department reduced services of the Annual Inspection in 2020.  The COVID19 pandemic placed a number of restrictions on conditions to carryout functions of the fire department.  Typically, Fire crews conduct annual company life safety surveys to Thornton businesses.  Local and federal guidelines were placed for safety and protections due to the unknown risks of the virus.  Precautions taken, due to the virus, reduced the staffing availability to initiate business inspections by the crew.  Inspections for 2020 were deferred based on the safety conditions dictated.

Thornton Fire Prevention will resume Company Inspection in 2021.  Initially, the inspection will be conducted per request of the business owner.  Fire Prevention Division staff will be the ones to complete the initial request.  Crew inspections are anticipated to resume Summer of 2021.

To assist with community safety, Thornton Fire Prevention has partnered with Brycer Compliance Engine for record management of third party inspections.  The Compliance Engine requires companies who inspect, maintain, or test protection systems to upload copies of the report to a data base.  This data base allows for Thornton Inspection staff to access and review reports at any time.  Business owners do not have to worry about maintaining copies of inspections for the fire department.  Brycer meets that code requirement.

I do apologize for any inconvenience or delays this may have caused.