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HDD Contractor Serving Denver, Colorado, Providing Horizontal Directional Drilling for Residential, Commercial, and Municipal Projects

Apex Underground is a Denver-area HDD contractor providing horizontal directional drilling for sewer lines, water service lines, and wet utility installations across the Colorado Front Range. The Apex team drills under roads, driveways, foundations, and mature landscaping without cutting a single surface: no open trench, no asphalt patching, no restoration costs, and no project shutdowns. Founded in 1985 and 100% employee-owned, Apex Underground brings 40 years of Front Range infrastructure experience to every bore, from a single residential driveway crossing to a full municipal road crossing under an active corridor. The team is available 24/7 for emergency utility situations that cannot wait.

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What Is Horizontal Directional Drilling, and When Does It Apply to Your Project?

Horizontal directional drilling is a controlled, subsurface boring method that installs pipe, conduit, or utility lines underground without disturbing the surface above. The drill enters the ground at a planned entry point, follows a steered bore path beneath the obstacle, and exits at a predetermined point on the other side. The simplest way to understand the core advantage: the drill goes in at one access point and comes out at another. Your driveway, landscaping, and concrete stay exactly where they are.

HDD is the correct method when open-cut excavation would require cutting through a road, driveway, parking lot, water feature, mature tree root system, building foundation, or railroad right-of-way. It is also the preferred method in urban and suburban Denver corridors where lane closure permits are difficult to obtain or where surface restoration costs would make open-cut excavation cost-prohibitive. For projects where an existing pipe is already in place and same-path replacement is the goal, pipebursting is a complementary trenchless method worth evaluating.

HDD vs. Open-Cut Excavation: A Practical Comparison for Denver Projects

The differences between horizontal directional drilling and open-cut excavation are concrete, not abstract. With HDD, there are no concrete saw cuts, no asphalt removal, no irrigation system damage, no lane closure permits required for most residential applications, and no surface patching across the bore path. Access point restoration is limited to the small entry and exit locations; nothing in between is touched. With open-cut excavation, the entire bore path must be trenched, shored, backfilled, and then restored: concrete, asphalt, landscaping, and all. In active Denver metro corridors, open-cut work also requires coordination with the City and County of Denver or CDOT for right-of-way permits and traffic control, which adds weeks to project timelines and significant cost.

For residential projects, the difference is immediate: no destroyed yard, no broken irrigation lines, no cracked driveway slabs, and no weeks of waiting for concrete to cure before the property looks normal again. For commercial and municipal projects, the difference is measured in schedule days, lane closure fees, and surface restoration budgets that can rival the utility installation cost itself. HDD eliminates all of those line items from the project equation.

HDD Applications Apex Underground Handles Across the Front Range

The range of projects where horizontal directional drilling is the right method spans all three markets Apex Underground serves, and the capability requirements are different at each scale.

On the residential side, the most common application is sewer line replacement under a driveway or concrete sidewalk. When a sewer lateral fails beneath an existing concrete surface, open-cut excavation means sawcutting, demo, trench excavation, backfill, and full slab replacement, a multi-day project that leaves the property disrupted for weeks. With HDD, the new sewer line is pulled through a bored path that passes beneath the concrete, and the only surface work is at the small entry and exit points. Water service line replacement under hardscaping and established landscaping follows the same logic: the bore path avoids the root systems, irrigation lines, and finished surfaces entirely. Apex also performs lateral replacement work in situations where open-cut access through a finished basement or crawlspace would be destructive. The bore path goes under the foundation rather than through it.

Commercial HDD applications include utility installation under parking lots and access roads for pad site development projects, sewer lateral installation for new commercial construction where the service connection must cross an existing paved surface, fire suppression line installation under structures where surface access is not feasible, and grease trap service connections under commercial kitchen floors and loading dock areas where breaking concrete is not an option. Apex Underground has completed this type of work for restaurants, food service facilities, and commercial developers throughout the Denver metro area.

At the municipal scale, the Apex team handles water main crossings under active road intersections, storm sewer installation in established utility corridors where lane closure would be operationally disruptive, and wastewater infrastructure rehabilitation in corridors where surface disruption to active roadways is not acceptable. Municipal water districts executing lead and copper service line replacement programs across the Front Range rely on HDD in corridors where the existing lines pass beneath streets, sidewalks, and other infrastructure that cannot be disturbed. Apex Underground operates from a five-acre facility with the equipment capacity to mobilize appropriately for any project scale, from a 40-foot residential driveway bore to a full municipal road crossing requiring specialized equipment and crew coordination. That scale of operational capacity is not something every trenchless contractor on the Front Range can offer.

The Apex Underground HDD Process: From Assessment to Completion

Every HDD project Apex Underground takes on follows a structured process, from the first site visit through final inspection. Here is what that process looks like in practice.

Step 1: Site Assessment and Bore Path Planning. Before any equipment is mobilized, the Apex team conducts a full underground utility locate to identify every existing utility line in the bore corridor. Soil condition review is completed to understand what the drill will encounter along the bore path, including clay-heavy soils common in the Denver metro and rocky substrates along the Front Range foothills, both of which affect tooling selection and bore timing. The bore path is planned with entry and exit points positioned to minimize surface impact and optimize drill angle for the specific soil profile.

Step 2: Permits and Coordination. Apex Underground manages the full permitting process for every HDD project, including right-of-way permits with the City and County of Denver, CDOT, or the relevant municipal authority, utility company coordination, and scheduling with inspectors. Clients do not manage permit applications or contractor coordination. This is a turnkey engagement from the first assessment call through final sign-off.

Step 3: Pilot Bore. The directional drill is set up at the entry point and the pilot bore begins, steering the drill head along the planned bore path from entry to exit. The drill head position is tracked continuously to verify the bore path follows the planned route.

Step 4: Reaming and Product Installation. Once the pilot bore is complete, the bore path is back-reamed (enlarged in diameter passes) to accommodate the final pipe or conduit. The product pipe is then pulled through the bore path from exit point back to entry. Pipe material and diameter are matched to the specific application, whether that is a sewer lateral, water service line, fire suppression line, stormwater conduit, gas line, or electrical conduit.

Step 5: Connections and Testing. Tie-ins to the existing utility system are made at both ends of the bore. Depending on the application, this includes pressure testing for water and fire suppression lines or camera inspection of sewer laterals to verify the installation before the project is closed out. The Apex QA/QC program covers every phase from pre-construction planning through post-construction verification, and the OSHA-certified team follows safety protocols specific to each project type throughout.

Step 6: Site Restoration. Restoration work is limited to the entry and exit access points only. Nothing along the bore path is disturbed, so there is no surface patching, no asphalt work, and no landscaping repair across the bore corridor.

Why Denver and Front Range Contractors Choose Apex Underground for HDD Projects

There are specific reasons the Apex Underground team wins commercial and municipal bids and earns repeat residential referrals across the Denver metro.

Employee Ownership: Apex Underground operates under a 100% ESOP structure, giving every team member equity in the outcome of the job. When the people doing the bore have a financial stake in the company’s reputation, accountability looks different than it does with hired labor. ESOP-structured contracting companies are rare in the underground utilities industry.
40 Years of Front Range Experience: Apex Underground has operated in this market since 1985, drilling through Denver metro clay, rocky foothills substrates, and municipal ROW corridors at every project scale, from a single residential sewer lateral to large municipal water district programs.
Operational Scale: The Apex facility and equipment inventory support everything from a residential driveway crossing to a full municipal road crossing, with the right equipment configuration mobilized for each project’s scope. Smaller trenchless contractors often run a single drill configuration that either over-specs a small job or falls short on a large one.
OSHA Certification and QA/QC: The Apex team runs a comprehensive QA/QC program from pre-construction through post-construction on every engagement, a baseline requirement for commercial and municipal buyers carrying project risk.
24/7 Emergency Response: Underground utility failures don’t schedule themselves, and HDD is often the fastest path to restoring service when open-cut excavation would require days of permitting and traffic management. The Apex emergency response team is available around the clock.
Financing Available: For residential clients facing unexpected sewer or water line replacement costs, financing through Hearth is available to help remove the cost barrier.

The Apex Underground service area covers Denver and more than 40 cities across the Colorado Front Range, from Colorado Springs north through the metro area, including Arvada, Aurora, Lakewood, Littleton, Highlands Ranch, Parker, Castle Rock, Thornton, Westminster, Broomfield, Centennial, Boulder, and surrounding communities.

Frequently Asked Questions

Can HDD be used to replace my sewer line without digging up my driveway?

Yes, and this is one of the most common residential HDD applications Apex Underground completes throughout the Denver metro. The new sewer line is pulled through a bored path beneath the driveway, eliminating any need to cut or remove the concrete surface, and the bore path avoids irrigation systems, landscaping, and adjacent hardscaping that open-cut excavation would damage. Surface disruption is limited to the small entry and exit access points.

What types of utility lines can be installed using horizontal directional drilling?

Horizontal directional drilling is compatible with a wide range of utility types, including water service lines, sewer laterals, fire suppression lines, stormwater conduit, gas lines, and electrical conduit. The specific pipe material and diameter determine the feasibility of HDD for a given application, as bore diameter and pull-back force requirements vary significantly between a 2-inch water service line and a 12-inch sewer lateral. Apex Underground assesses each project individually to confirm that HDD is technically appropriate and to select the correct tooling and bore configuration for the specific pipe type, size, and soil conditions.

How long does an HDD project typically take in Denver?

A residential sewer or water line replacement via HDD typically takes one to three days from mobilization through tie-in and testing, depending on bore length, soil conditions, and tie-in complexity. Commercial and municipal projects vary by scope, with larger road crossings and multi-line installations requiring additional time for reaming passes and phased installation. Denver metro soil conditions are a real variable: clay-heavy soils in many residential corridors can slow bore progress and require mud management, while rocky substrates in foothills communities along the Front Range require hardrock tooling and adjusted drill parameters. The Apex Underground team accounts for these local conditions during bore path planning, so timeline estimates are based on what the ground actually is, not a generic assumption.

Does Apex Underground handle the permits for HDD projects in Denver and surrounding cities?

Yes. Apex Underground manages the full permitting process for every HDD project, including right-of-way permits with the City and County of Denver, CDOT for state highway crossings, and the relevant municipal or county authority for projects in surrounding Front Range cities. Utility locates, coordination with municipal ROW offices, and scheduling with inspectors are all handled by the Apex team. Clients do not need to manage permit applications, coordinate with utility companies, or navigate the regulatory process independently. Turnkey project management from initial site assessment through final inspection is how every Apex Underground engagement is structured.

What is the difference between HDD and pipebursting, and which method is right for my project?

HDD and pipebursting are both trenchless methods, but they work differently and apply to different project conditions. HDD installs new pipe through a bored path that is drilled independently of any existing pipe. It creates a new underground route. Pipebursting destroys the existing pipe by pulling an expanding head through it and simultaneously pulls new pipe into the void left behind. HDD is the correct method when there is no existing pipe to use as a guide, when bore path obstacles require a new route, or when the project involves a first-time utility installation. Pipebursting is preferred when an existing pipe is in place and the goal is same-path replacement in a single operation. Apex Underground performs both methods and will recommend the appropriate technique after completing a site assessment.

If you have a project that requires drilling under a road, driveway, building, or any other obstacle on the Colorado Front Range, the Apex Underground team is ready to assess the bore path and provide a project-specific quote. Whether the project is a residential sewer lateral under a driveway in Lakewood, a fire suppression line under a parking lot in Aurora, or a municipal water main crossing under an active corridor in Denver, the Apex team brings the equipment, the credentials, and 40 years of Front Range subsurface experience to get it done right. Contact Apex Underground today to request a quote for your horizontal directional drilling project.