The Different Moling Service Types

Moling is a reliable and efficient way to carry out underground installation work without the need for open trenching. Used for both small residential jobs and large commercial property developments, moling lets us install or replace water supply pipes, gas lines, and cable and duct systems quickly.

In this guide, we’ll explore the different moling service types, explain how the moling process works, and show why this method is often the best choice for modern underground work.

What Moling Involves

Moling is a digging method that makes it possible to install underground services without having to excavate a trench along the full route. Instead, two small pits are dug: one for starting the mole and one for receiving it.

The mole itself is a tough steel cylinder, powered by compressed air. It moves forward through the earth by striking it repeatedly, clearing the way ahead. As the soil is pushed aside, it forms a tunnel that allows us to pull pipes or ducts through, out of sight beneath the surface.

Due to it avoiding the need for large-scale digging, moling is especially useful where ground surfaces need to be preserved. It works well in gardens, across driveways, beneath roads, and in environmentally sensitive areas.

Main Types of Moling Services

Moling can be used in different ways depending on the job. The method chosen depends on what we’re installing, the length of the run, and the ground conditions at the site.

Impact Moling Services

This is the most widely used technique. A compressed air mole is launched from a shallow pit, striking forward through the ground to make a tunnel. The new pipe or duct is then pulled through the space created.

Impact moling services work best over short, straight distances—usually up to around 15 metres per run. The method is well suited to installations of water pipes, gas, data cables, and small sewer lines. Pipe diameters can range from 25mm to 150mm depending on the project.

Because the mole travels in a straight line, extra pits may be needed where routes change direction. Even so, the disruption is far less than with open excavation.

How It Compares to Directional Drilling

Directional drilling is a guided method often used when a curved path is needed or the length of the installation is larger. It uses tracking systems to steer the bore from one end to the other, making it possible to avoid obstacles or follow complex routes.

Although directional drilling has its benefits, impact moling is simpler, quicker, and more affordable for most short-distance utility work. We’ll always recommend the right method depending on what the site requires.

Residential and Commercial Uses

In domestic settings, moling is commonly used for lead pipe replacement, solving leaks or low pressure in old water supply pipes. It also allows us to connect new homes to existing mains without damaging gardens or driveways.

On commercial property, moling is used for much larger installations—often including several services at once. From gas lines to electrical feeds and fibre optic cables, we can install what’s needed beneath paved areas, car parks, and public paths without shutting the site down.

Site-Specific Applications

While moling works in many situations, we always carry out a proper review first. Whether it’s a long private driveway, a heritage site, or a newly landscaped park, we’ll plan carefully to ensure the work is completed without unnecessary mess or delay.

How the Moling Process Works

Each moling process we carry out follows a planned approach, with key stages designed to minimise disruption and ensure long-term success.

Survey and Planning

First, we visit the site and carry out a full assessment. We check the layout, measure up the route, and look at what’s under the surface. Crucially, we examine soil types to determine if the mole will move easily. Clay soils are generally ideal. Gravel, sand, or hard-packed material can affect how we proceed.

This preparation allows us to plan the exact locations of the entry and exit pits and decide how deep the pipe or duct will run.

Launch and Bore Creation

Once the pits are prepared, the mole is placed in position and aligned. As it powers forward using bursts of compressed air, it creates a clean tunnel between the two pits.

The new pipe is either pulled through from one side or attached and drawn back behind the mole, depending on the setup.

Connection and Testing

After installation, we carry out the necessary connections. These are checked thoroughly for pressure, flow, and watertight performance. We don’t sign off on a job until every part of the new service is working as it should.

Surface Reinstatement

With the pipework in place and tested, we refill the pits using the excavated material. We restore the surface to match its previous condition, whether that’s turf, paving, tarmac or concrete. Our aim is always to leave as little trace of the work as possible.

A Cost-Effective Solution

Moling is not only quicker and cleaner than traditional trenching—it’s also more affordable in many cases.

Because there is less digging, fewer materials are disturbed. Less time is spent on labour, machine hire, and surface reinstatement. And because the job is done faster, costs are reduced across the board.

Where other methods might require a full team and days of heavy machinery, moling can often be completed with a smaller crew in less than a day. The results are reliable and long-lasting, making moling a smart choice from both a practical and financial point of view.

Ground Conditions and Soil Types

Not every site is suitable for moling. Before we proceed, we check the ground conditions carefully to confirm that the mole can travel without difficulty.

Soft, moist soil types such as clay or loam tend to allow smooth movement. Loose sand may shift more during boring, and gravel or stone-heavy soil can slow the mole or cause it to go offline. In some cases, we may need to use shorter runs, more pits, or a different technique entirely.

The important thing is preparation. By understanding the site from the start, we can avoid surprises and keep the project running smoothly.

A Cleaner Way to Install Pipes and Ducts

One of the biggest advantages of moling is its low impact on the surroundings. As a trenchless installation method, it avoids the noise, disruption, and damage that comes with digging open trenches.

This is especially valuable in environmentally sensitive areas. Whether working near trees, protected land, or finished landscaping, moling allows essential utility work to be carried out with very little surface impact.

By reducing the need for machinery and lowering waste, moling also contributes to more sustainable construction practices. It supports greener, safer, and more efficient upgrades to utility networks.

Why Choose DHC Utilities?

At DHC Utilities, we bring experience, skill, and professionalism to every project. Our team is trained in the latest impact moling services and equipped to handle a wide range of underground works, from private homes to major developments. We are a water safe contactor approved by United Utilities and their WIAPS scheme. 

We understand how to manage all aspects of a pipe replacement, new gas lines, or cable and duct installation—ensuring the work is completed quickly, safely, and with care.

When you choose us, you’re choosing a partner who values clear communication, proper planning, and long-term results.

Get in Touch

If you’re planning an underground installation or need to replace ageing pipework, moling could be the answer.

DHC Utilities provides expert advice, fair pricing, and dependable results on every job. Whether it’s a short water pipe run in a garden or a full duct installation beneath a busy site, we’ll deliver a service that works, with minimal disruption and maximum efficiency.

Contact us today to find out how our moling service types can support your next project.