Building Inspection Division
The Building Inspection Division is responsible for the Plan Review, Permit Issuance and Inspection of new construction projects and remodel of existing structures in the City of Thornton.
Office Hours are 8:00 a.m. to 5:00 p.m. Monday through Friday. Payments at the counter are accepted 8:00 a.m. to 4:30 p.m. Payments can be made through the online portal at any time.
Starting 11/02/2022 the City of Thornton will no longer accept applications for elevators.
All permit submittals for new elevators will be handled by the State of Colorado effective
1/01/2023 https://ops.colorado.gov .
Notice to contractors and homeowners: your inspection may be performed by an unmanned aerial vehicle (UAV) commonly known as a Drone.
Schedule your inspections online through our CityView Portal. You will need to register on the portal in order to schedule inspections. Make sure to follow the instructions for registration under the Portal Help menu. If you are a contractor you will need to log in using your company login. You can also schedule inspections through the Inspection Request Line 303-538-7396.
EFFECTIVE 8/01/2022 the cutoff time for requesting next business day inspections will be 3:30 pm.
leave the following information in this order when scheduling your inspection. It is advised that a landline be used to request your inspection rather than a cell phone.
Type of Inspection
Let us know if this is a Re-inspection
Access must be provided to all areas or items needing inspection. If we need access to your back yard to complete the inspection, please give us verbal permission in the request.
Please make sure that there are no animals in the back yard.
An adult at least 18 years of age shall be present for all required interior inspections.
Consultation inspections are available to any permit holder. If the inspection is not available on the permit please call 303-538-7250.
For information on inspections eligible for time windows and how to request a time click on the following link: INSPECTION TIMES
Weather and Cancellations
In the event of ice, snow, wind or other weather event, inspections may be cancelled if it is determined that they cannot safely continue. Cancellations are generally not automatically rescheduled. Please refer to the portal to view inspection results and/or reschedule inspections.
In addition, the following policies regarding inspections have been put in place.
Contemporaneous Reviews Policy
ATTENTION ALL RESIDENTIAL FOUNDATION INSTALLERS|
PLEASE READ UFER INSPECTION REQUIREMENTS EFFECTIVE MAY 16, 2022**CLICK HERE**
Please click on the topics below to learn more about each section.
Occupied Structure Inspections (Homeowner projects and remodels, Commercial TI projects)
We have resumed in-person inspections within occupied structures and will attempt to accommodate the homeowner based on their comfort level with in-person inspections. If a virtual inspection is preferred, please clarify such when scheduling the inspection (**see virtual inspection guidelines below). We will continue to provide in-person inspections for work being done outside of the occupied structure (i.e. roofs, fences, detached garages, etc.).
**Virtual Inspections (Video Call)
The following is a list of what we believe could be inspected via virtual inspection in an occupied structure: caisson, footing, stem wall, water heater, furnace, AC, rough inspections, drywall, final inspections, final deck/ patio cover, driveway, and fence.
All Roof inspections can be done virtually or with a drone.
All Solar PV rough-in electrical inspections will be done virtually. Onsite contact information must be provided when scheduling.
Basement finish re-inspections may be scheduled for virtual inspection and will be left to the discretion of the inspector whether an inspection can be completed.
*The exception to this rule will be when there is an inspection that is specifically related to safety/health in occupied structures.
**Before scheduling a virtual inspection, please verify you have the following:
Google Duo app installed on your mobile device,
Wi-Fi connection with a strong 4G or better signal (be sure the signal works outdoors as you will be asked to verify your address in the video)
Turn off notifications on your mobile device prior to the video inspection (your connection may freeze or drop the call)
Have inspection tools available (tape measure, level, flashlight, GFCI capable outlet tester, step ladder)
When scheduling the inspection, provide name and phone number of the person operating the camera. If this information is not provided the inspection will be automatically canceled.
***If at any time the inspector believes he cannot complete an inspection virtually due to poor signal, or other reason he may require the inspection be rescheduled at a later date and/or in-person.
CO Routing Prior to Final Inspection
Required only for Commercial, Multi-family, and Single Family Attached Shell Permits. To begin the routing process please call 303-538-7250 one week prior to requesting final inspections.
Fire Department Information
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. For questions regarding fire permits contact the Fire Department directly at 303-538-7602.
The City of Thornton has amended the roofing sections of the International Building Code and the International Residential Code to require asphalt shingles to carry a manufacturer's national wind warranty for the City’s designated wind speed of 90 mph 3-Second Gust. Please see our
Roofing Standards for a list of approved shingles and other roofing requirements.
Please click here to read the Roofing Inspections Policy effective 6-15-2020
A building permit is required any time you erect, construct, enlarge, remodel, alter, repair, move, improve, remove, convert, demolish, or change the type of occupancy of any building, structure or utility. For a list of projects that require a permit and a list of projects that do not require a permit, click on the
Building Permit Requirements link listed under the Permits, License Application section of links.
The process to obtain a permit will vary dependent upon the complexity of the project. It is our goal to get plans through the system and a permit issued in the minimum amount of time possible.
Once you have all of the information gathered for a complete submittal package the application and plans can be submitted electronically through the CityView Portal. 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
Once all approvals have been completed, the application is prepared for permit issuance by the permit technician staff. They will verify that all contractors are currently licensed, all permission forms have been received and calculate the permit fee. Once this is complete, you will be notified that the permit is ready for issuance. Following payment of fees, you can access the building permit, required inspection and the approved plans by accessing the permit in the online portal.
Code & Amendments
Adopted Codes for the City of Thornton
2018 International Building Code
2018 International Residential Code
2018 International Plumbing Code
2018 International Mechanical Code
2018 International Fuel Gas Code
2018 International Existing Building Code
2018 International Energy Conservation Code
2018 International Swimming Pool and Spa Code
2018 International Fire Code
2017 National Electric Code
2021 I-Code Adoption Information
The City of Thornton has adopted the ICC 2021 building codes on February 14, 2023, with amendment to the THORNTON CITY CODE 10, ARTICLE II pertaining to the expiration of building permits, and repealing and reenacting ARTICLE IV to adopt by reference, with local amendments thereto; the 2021 editions of the International Building Code, International Plumbing Code, International Mechanical Code, International Fuel Gas Code, International Residential Code, International Energy Conservation Code, International Existing Building Code, International Swimming Pool and Spa Code, and the 2020 edition of the National Electric Code. The effective date will be June 1, 2023. After June 1, 2023, all building code applications will only be reviewed under the ICC 2021 code editions and the NEC 2020.