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Horizontal Directional Drilling

Horizontal Directional Drilling (HDD) is the preferred method for installing underground utilities where minimal surface disruption is essential. It provides a safe, efficient, cost effective and environmentally responsible alternative to open-cut trenching, especially in complex or sensitive environments. 



OCU is a fully accredited trenchless construction contractor with over 20 years of experience delivering HDD and trenchless solutions across the UK and Ireland. 


Our in-house design and execution capabilities ensure that each project is managed safely, sustainably, and to the highest quality standards.


Roads, motorways, railways, canals, rivers, runways and a variety of other obstacles can be crossed accurately and efficiently with minimal environmental or operational impact.



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  1. HDD - Special Interest Areas

  2. HDD - Transport Links

  3. HDD - Cable Landing

  4. HDD - Bodies of Water / Rivers

Our range of HDD services includes:

  • Horizontal Directional Drilling (HDD)

  • Expert design and technical services

  • Trenchless installations beneath roads, rivers, and built-up areas 

  • Utility diversions and deep installations

  • Minimal surface disruption

  • Marine outfalls and landfalls

  • Environmental and protected area installations

  • Urban and industrial infrastructure

  • Design and technical services

  • Innovative machinery and resources

  • Installations under live motorways and railways

  • Estuary, sea loch and inter-island crossings

  • Consent negotiation for railway, trunk road, main river and canal crossings

  • Pipe pushing

  • Auger boring

  • Direct pipe

  • Pipe bursting

  • Microtunnelling

  • Tunnelling

  • Shaft construction

  • Rehabilitation of existing pipelines

What our clients say...

Featured Case Studies

Kintore Substation - HDD Installation

OCU delivered a design-and-build HDD solution at Kintore Substation to install new cable ducts for twin 132kV circuits beneath the B977, replacing existing oil-filled cables.

School Hill & Addison Road HDD UTX

OCU delivered complex utility diversion and under-track crossing (UTX) works at School Hill and Addison Road as part of HS2’s Enabling Works Contract in Calvert, Buckinghamshire.

Corran Narrows

OCU delivered a critical 33kV underground cable installation beneath Loch Linnhe to replace ageing seabed cables that had repeatedly faulted due to harsh tidal and geological conditions.

Axford Pipeline Thames Water

OCU was appointed to deliver the Axford Pipeline scheme for Thames Water. The project involved constructing a 17.6km clean water pipeline, building a new booster station at Dorcan.

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