Building Permits & Inspections

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.

Notice: Service Charge for Debit/Credit Card

As of May 6th, 2024 there will be a service charge added for every payment made by debit/credit card. The service fee, paid directly to the card processor, will be 3.15%. Please note this charge is for payments by debit/credit cards only. Alternative payment types; ACH (echeck - which can be paid through the portal), checks, and cash will continue to be accepted without additional service fees.  We do not accept American Express.


Roof Inspections Done Virtually Effective 7/3/2024

Building Guides & Division Reports

Use the building guides to assist you in creating your building plan and applying for your permit.


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.  For roofing inspections only call 303-538-7430.

In addition, the following policies regarding inspections have been put in place:

Contemporaneous Reviews Policy [PDF/198KB]

Attention all residential foundation Installers: 
Please read UFER Inspection Requirements Effective May 16, 2022.

UFER Inspection Requirements [PDF/106KB]

Design Criteria

Inspector Contact Information