What is HDD?

HDD or Horizontal Directional Drilling is a trenchless boring method for installing underground cables, pipes and conduits in a shallow curve along a prescribed bore path with the use of a surface-launched rig / machine, which minimises the disruption of th surrounding area, for example, roads and driveways.

With HDD safety risks are also minimised as compared to open trenches and are perfectly suited to high volume traffic situations.

Trenching and excavation work is often far more costly and not practical and this is where HDD comes in, reducing the re-instatement costs of roads, verges and driveways and therefore satisfying the demands of local Municipalities and residential, commercial and industrial estate managers.

What is the process?

As per the image, there are three main stages as follows:

Pilot Drilling:

Installing a pilot hole drilled from the surface at a pre-determined angle and along a prescribed path. During the pilot bore, a sonde (transmitter) and a tracking (receiver) device are utilized to be able to precisely locate and steer the drill string underneath the surface.


Enlarges the pilot hole to achieve the required size. Reaming is usually performed in stages until the final desired diameter of hole is reached.

Pipe pullback:

The pipe is connected to the drill string and then pulled from the exit pit side towards the entry pit side on the same pre-reamed path.

Installation examples:

  • Water lines
  • Sewer lines
  • Storm water
  • Cable ducts (optic fibre, telecommunication and electricity etc.)


The cost of HDD is determined by the diameter and length of the product to be installed as well as the ground conditions and site risks.

Areas of Service:

Based in Kwazulu Natal, we are able to work throughout the province including Durban, Umhlanga, Ballito, Stanger, Richards Bay, Pietermaritzburg, Port Shepstone and in neighbouring provinces and cities including Johannesburg and Pretoria, Gauteng.

For further information or a quote, feel free to contact us.


What do our customers say about us?

  • With KMs of pipe lines, namely water, sewer and gas, to be drilled underground, we needed a reliable, professional company that could complete the work as efficiently as possible and with as little disruption to other services. We're very pleased to have found HD Drilling Contractors.
    Johan // Director
  • Our project involved laying underground pipes and cables throughout a prestigious residential estate and in finding HD Drilling we were impressed with the excellent customer service and quality project management. Thanks guys.
    Linda // Site Surveyor
  • Fast, professional, reliable and friendly - what a great outfit and super management team. We'll be working with you again and again. Well done HD!
    Zelig // Highways Management Director