Hours: 8am ‐ 5pm MNT M‐Fri

Excellence Integrity. Safety.

Diamond Excavating is a multi-year winner of the "Subcontractor of the Year" designation by the American Subcontractors Association of Colorado.

Integrity Safety. Excellence.

Diamond Excavating dedicated to professional, safe, and timely production of work, giving personal attention and high quality service.

Safety Excellence. Integrity.

Diamond Excavating is committed to the safety of employees and projects at all levels.

Diamond Excavating has an extensive portfolio of commercial projects


Cost containment certified by the State of Colorado, specializing in on-time, responsive demolition, excavation, grading and site preparation for projects of all sizes.

Public structures include large to small projects from the Douglas County Sheriff's building to the Denver Dumb Friends League and many more


Precision demolition, removal and cleanup of existing structures, excavation and overlot grading for streets and infrastructure, underground utilities, foundations.

site development and overlot grading, underground utitlities foundation excavation for residential developments


Site preparation and overlot grading for streets and infrastructure, underground utilities, and foundations for planned communities, infill developments.

excavation, foundation prep and utilities for custom homes and residential developments

High-End Custom

Multi-level excavation, specialized foundation and footer support excavation; underground utilities, demolition of pre-built structures.


Diamond Excavating, Inc. is one of Colorado's most trusted and successful excavating companies, specializing in earthwork, site development overlot grading, and wet utilities, with offices in the Denver metro area. For more than 39 years we have served customers in Colorado and the surrounding states.

Dedicated to the safe and timely production of work, giving personal attention and quality service to the contractor and project owner. We handle any job size with our fleet, consisting of 120 pieces of equipment of various types and sizes.

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In action
at Residence Inn by Marriott in Broomfield, Colorado

Project encompassed a 3.5 acre site development for a four-story hotel with a footprint of 40,000 square feet. Overlot grading and foundation excavation included a seven-foot overexcavation and recompaction below the building, approximately 90,000 square feet of combined concrete and asphalt preparation, and approximately 50,000 square feet of landscape grading. Site development included a utility package of storm sewer, sanitary sewer, and waterlines for a combined half a mile of piping and numerous below grade structures.