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Thornton's new CityView portal is still under construction. Please continue to use the following applications. At the time Thornton's CityView portal comes online, visitors will be automatically redirected to the new portal.

Thornton issues a variety of building, development, and infrastructure permits. Please ensure that you select the proper type of permit prior to completing your application. Contact us if you have any questions.

Permitting Notices

  • Minimum fee for any right-of-way construction permit associated with franchise or pursuant to any type of right-of-way use agreement: $250ea.
  • Operating without a permit. Any person found to be conducting any construction activity, work, or excavating activity without having first obtained any type of construction permit or other required permits, shall immediately cease all activity (exclusive of actions required to stabilize the area), and be required to obtain all applicable permits before the project may be restarted. An additional surcharge shall be set by resolution of the city council.

Building Permit Application

If you have any questions please call the City Development at 303-538-7295, or email citydevelopment@cityofthornton.net. Additional information is available at the Contractor License page.

Building Permit

A building permit is required anytime a homeowner or contractor erects, constructs, enlarges, remodels, alters, repairs, moves, improves, removes, converts, demolishes, or changes the type of occupancy of any building, structure or utility.

Contractor License Application

If you have any questions please call the Building Inspection Division at 303-538-7250, or email buildings@cityofthornton.net. Additional information is available at the Building Inspection Division page.

Contractor License

The City of Thornton requires licensing for all contractors involved in the construction, alteration, remodeling, repairing and equipping of buildings and structures; installation of underground utilities; construction of roads and streets and construction of all City-owned water, sewer, and storm drainage facilities. Homeowners doing work on their personal private residence are not considered contractors and are not required to obtain a contractor license.

Development Permit Applications

If you have any questions please call the City Development office at 303-538-7295, or email permits@cityofthornton.net. Additional information is available at the Development Engineering page.

Development Permits

Permits for new development, redevelopment, sewer service repair (includes in yard/lot and right-of-way), and water service repair (includes in yard/lot and right-of-way) work.

Infrastructure Permit Applications

If you have any questions please call the Infrastructure Engineering office at 720-977-6210, or email infrastructure.permits@cityofthornton.net. Additional information is available at the Infrastructure Services page.

To see if your permit application will be affected by any city street rehabilitation, click here to view the Street Rehabilitation Map.

CIP Permits

City of Thornton capital improvement project work.

Franchise Permits

Work being ordered for XCEL, Comcast, Centurylink, United Power.

Other Permits

Right-of-way permits for special events, on-street containers, and right-of-way work such as boring, potholing, volunteer work, and utilities.