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Denver's Premier Directional Drilling & Excavation Experts

Top-notch construction services for commercial and residential projects throughout Denver, Colorado. From precision directional drilling to complete excavation solutions.

Licensed & Insured

Full compliance & protection

Advanced Equipment

Latest drilling technology

Expert Team

Decades of combined experience

On-Time Delivery

Projects completed as scheduled

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Free consultation • Fast response time

Comprehensive Construction Solutions

We specialize in a wide range of services to handle any project with precision and excellence

July 1, 2025 - Stralsund-Germany: Small horizontal drilling machine with drill by start pit at roundabout corner, orange and white cables, sand heaps, fences and distant roadworks.

Directional Drilling

Advanced horizontal drilling technology for utility installations with minimal surface disruption and maximum precision.

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Excavation

Professional excavation services for foundations, trenches, and site preparation using state-of-the-art equipment.

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Trenching

Precise trenching solutions for utility lines, drainage systems, and underground infrastructure installations.

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Hydrovac Services

Non-destructive hydrovac excavation for sensitive areas and precise utility location around existing infrastructure.

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Fiber Optic Pulls

Expert fiber optic cable installation and pulling services for high-speed network infrastructure and telecommunications projects.

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Why Denver Trusts Onmark LLC

With decades of combined experience and a commitment to excellence, we've become Denver's go-to contractor for complex excavation and directional drilling projects.

Proven Track Record

Successfully completed hundreds of projects across Denver, from small residential jobs to large commercial developments.

State-of-the-Art Equipment

Our fleet includes the latest directional drilling rigs and excavation machinery for maximum efficiency and precision.

Experienced Team

Our certified operators and project managers bring expertise and professionalism to every job site.

Safety First Approach

Fully licensed, insured, and compliant with all safety regulations to protect your project and our team.

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Our Work Speaks for Itself

From complex directional drilling projects to large-scale excavation work, we deliver results that exceed expectations.

July 1, 2025 - Stralsund-Germany: Small horizontal drilling machine with drill by start pit at roundabout corner, orange and white cables, sand heaps, fences and distant roadworks.
Directional Drilling

Utility Line Installation

Precision horizontal drilling for underground utility installation with minimal surface disruption.

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Excavation

Conventional Utility Excavation

Professional trenching and excavation services for underground utility line installation and maintenance.

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