city pond and landscape

​Development Engineering

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Development Engineering oversees design and construction of public and  private infrastructure within the City of Thornton. Development Engineering works closely with Current Planning, Building Inspection, and Landscape Architecture divisions to provide pre-application meetings, review submittals, and complete inspections of improvements.

Construction Drawings

Construction Drawings are required for most development projects, and shall adhere to City of Thornton Standards and Specifications. Construction Drawings are often submitted in tandem with a Traffic Report, Drainage Report, and Utility Report. Approved reports and drawings are required prior to the issuance of a Construction Permit. See the Construction Guide page for submittal requirements. Visit the Building Inspection page for information on building permits.


Development Engineering inspectors are assigned to a project for its duration. Inspections are scheduled through the inspector. Contact information can be found below.

Construction and Traffic Control Permitting

Construction and Traffic control permits are issued through Development Engineering. See the Construction Permit Handout to ensure all criteria have been met before applying. Construction permit and/or Traffic Control permit applications may be completed online using the links on this page.

Performance Guarantee Forms

Surety shall be furnished to The City of Thornton as a guarantee that all work completed meets or exceeds The City of Thornton’s Standards and Specifications, and will be completed in a timely manner. The surety protects The City of Thornton against damage or loss of city owned property, and non-fulfillment of any obligation covered in the Developer's Agreement. During the warranty period surety shall be decreased to cover all work completed until final acceptance. ​

Development Engineering Division Contacts


​​​​ Cassie Free

Development Engineering Manager

(303) 538-7207​

Crystal Carlow

Senior Civil Engineer

(303) 538-7583

Nate Hatleback

Project Manager

(303) 538-7694

Emily Gonzalez

Project Manager

(303) 538-7426

Tim Semones

​Civil Engineer

​(303) 538-7634

​​​​​Inspections ​& Permits​​

Brian Stockton

Paul Martinez      

Development Inspection Supervisor

Development Inspector I

(303) 538-7341

(303) 538-7272

  ​Kevin Salmen

Development Inspector II

(303) 538-7399

Craig Schroeder

Development Inspector I

(303) 538-7269

Mike Alexander

Civil Engineering Tech I

(303) 538-7409