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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.

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.

Building Permit 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.

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.