Horizontal Directional Drilling

Trusted Plumbing & Heating provides horizontal directional drilling for underground water lines, sewer connections, utility conduits, and related pipe projects across King and Pierce Counties. Our trenchless approach creates a planned underground route while reducing the need to excavate long sections of your yard, driveway, landscaping, or commercial property.

Service at A Glance

• Installs underground pipe and utilities without digging one continuous trench
• Helps protect driveways, landscaping, sidewalks, roads, and finished surfaces
• Suitable for water lines, sewer connections, electrical conduits, and communication lines
• Uses a guided pilot hole to follow a carefully planned underground path
• Available for homeowners, plumbers, contractors, and commercial property managers
• Completed by a licensed and insured local company with over 40 years of industry experience
• Service is available throughout King County, Pierce County, and the Greater Seattle area
• Call Trusted Plumbing & Heating at (206) 577-7729 for 24 hour emergency plumbing assistance

What Is Horizontal Directional Drilling?

It is a trenchless method that installs a pipe or conduit along a controlled underground path instead of opening a full-length trench.

A drilling unit creates a small entry point and sends a guided drill head underground. Once the pilot hole reaches the planned exit area, the opening is prepared for the new pipe, utility line, or conduit.

HDD is used when open excavation would damage valuable surfaces, disrupt access, interfere with traffic, or create unnecessary restoration work. It can provide a practical route beneath:

• Driveways and parking areas
• Sidewalks and walkways
• Established landscaping
• Retaining walls
• Patios and finished yards
• Roads and access lanes
• Commercial property surfaces
• Other underground utilities

The exact method depends on the soil, available workspace, bore length, required depth, pipe material, and surrounding infrastructure. Trusted Plumbing & Heating evaluates these conditions before recommending drilling services.

What Can Directional Drilling Install?

Directional drilling can install new underground water, sewer, electrical, communication, and utility lines while limiting surface excavation.

Water Service Lines

A damaged or outdated water line does not always require a long trench across the property. Horizontal directional equipment can create a route for installing utility pipe beneath landscaping, pavement, or other obstacles.

This approach may be especially useful when the water meter and building connection are separated by a driveway, finished yard, sidewalk, or busy access area.

Sewer and Drain Connections

For suitable sewer construction projects, directional drilling may help establish a new underground route without removing every surface above the line.

Because sewer pipe must meet specific grade, depth, and connection requirements, our team evaluates the site before determining whether directional drilling, pipe bursting, excavation, or another trenchless method is appropriate.

Electrical and Communication Conduits

Underground conduits can protect electrical, fiber, telecommunications, and low-voltage product lines. Directional boring allows these pathways to cross beneath developed surfaces with fewer open excavations.

Contractor and Plumber Support

Trusted Plumbing & Heating also works with other plumbers and contractors that need experienced underground boring support. We can assist with the drilling portion of a larger installation while coordinating around the project specifications and existing site conditions.

How Does the HDD Process Work?

The process normally includes planning the route, drilling a guided opening, enlarging the bore when necessary, and pulling the new pipe into place.

1. Inspecting and Planning the Route

We first review the entry point, destination, underground obstacles, required depth, soil conditions, and type of pipe being installed.

Existing utility information must be considered before drilling begins. Proper planning helps reduce conflicts and determines whether the proposed route is realistic.

2. Creating the Pilot Hole

A guided drill head creates the pilot hole along the planned horizontal directional path. The operator monitors its position and adjusts the direction to keep the bore on course.

This controlled process is what separates directional boring from an unguided underground opening.

3. Preparing the Bore

Depending on the size of the new pipe, the pilot opening may need to be enlarged. This step creates enough space for the intended pipe or conduit without unnecessarily disturbing the surrounding ground.

4. Installing the Pipe

The new pipe is connected to the drilling assembly and carefully pulled through the prepared underground path. Connections, flow requirements, and other project details are then checked before the work is completed.

Which Trenchless Method Fits the Project?

The best method depends on whether the project requires a new route, replacement of an existing line, or a straight crossing beneath an obstacle.

Auger boring is generally better suited to straight crossings, while HDD allows greater control over the underground route. Pipe assist techniques or specialized trenchless construction methods may also be considered when soil, access, pipe size, or installation requirements make a standard approach less suitable.

Trusted will explain the practical options instead of automatically recommending the most complicated one.

Why Choose Trusted Plumbing & Heating?

You need a contractor that understands both underground drilling and the plumbing system the new line must serve.

Trusted Plumbing & Heating is a locally owned and family-operated company serving homeowners, businesses, contractors, and plumbing professionals throughout the Greater Seattle area.

More Than 40 Years of Industry Experience

Our team brings over four decades of plumbing and underground service experience to residential and commercial projects. Owner and founder Jim Cunningham has built Trusted around dependable work, straightforward communication, and respect for the customer’s property.

Licensed and Insured in Washington

Trusted Plumbing & Heating maintains Washington construction contractor license TRUSTPH840KO and plumbing contractor license TRUSTPH781NC. Our technicians assess the full installation, not only the underground bore.

Clear Project Information and Pricing

The cost of boring horizontal routes depends on access, distance, depth, soil, pipe diameter, utility conflicts, and restoration requirements. We inspect the site and provide clear information about the recommended service before work moves forward.

Local Service Across King and Pierce Counties

Our service area includes Renton, Seattle, West Seattle, Kent, Tacoma, Bellevue, Federal Way, Auburn, Puyallup, Lakewood, and many surrounding communities.

Local knowledge matters because soil conditions, property layouts, utility density, permitting requirements, and access limitations can vary considerably throughout the region.

When Is Directional Drilling a Good Choice?

Directional drilling is worth considering when a new underground line must cross beneath a surface that would be difficult or expensive to remove and rebuild.

Common project situations include:

• A water line running beneath a driveway
• A utility route crossing established landscaping
• A conduit installation beneath a parking lot
• A new pipe route around existing underground obstacles
• A commercial project where access must remain open
• A property where reducing excavation and restoration is a priority

It is not automatically the right solution for every property. Limited entry space, unsuitable soil, underground congestion, pipe grade requirements, or difficult access may make another method safer or more cost-effective.

Our job is to recommend the method that fits the actual site, not force every project into the same solution.

Frequently Asked Questions

How much does horizontal directional drilling cost?

Pricing depends on the bore length, depth, soil conditions, pipe size, access, underground obstacles, and utility requirements. A site inspection is normally needed to provide an accurate project estimate.

Is directional drilling cheaper than trenching?

It can be more cost-effective when trenching would require substantial concrete removal, landscaping repair, traffic control, or surface restoration. For simple projects in open ground, conventional excavation may cost less.

Can directional drilling go under a driveway?

Yes. It is commonly used to install pipe or conduits beneath driveways without cutting a continuous trench through the surface. Entry and receiving areas are still required.

Can HDD install sewer pipe?

It may be used for certain sewer installations, but the required slope, depth, connections, soil, and local conditions must be evaluated carefully. Some sewer projects are better suited to pipe bursting or excavation.

Will directional drilling damage my yard?

Some ground disturbance is necessary at the entry and exit areas, but the process normally causes much less surface disruption than excavating the entire pipe route.

How long does a directional drilling project take?

Smaller projects may be completed relatively quickly, while longer or more complex projects require additional preparation and installation time. Utility coordination, permitting, soil, access, and bore length can affect the schedule.

Request a Directional Drilling Estimate

Avoid tearing through more of your property than the project requires. Contact Trusted Plumbing & Heating to schedule an evaluation and find out whether directional drilling is the right way to install your underground water, sewer, or utility line.

Phone: (206) 577-7729