Preserving 2,000 Years of Roman Heritage While Enabling Modern Construction

When a school in Caerleon required a much-needed extension, our vac-ex team faced a challenge that extended far beyond construction.

Situated within one of Britain’s most significant Roman settlements, the site lies above archaeological remains dating back almost 2,000 years. While the existing school had originally been built before modern archaeological assessments were commonplace, the new extension presented an opportunity, and a responsibility to ensure any surviving Roman remains were protected.

Pier (UK) LTD was appointed to support the excavation works, working in close partnership with the project’s archaeologist to safely expose the ground while preserving the integrity of the historic site.

The Challenge

Building within an area of archaeological significance requires a completely different approach to excavation.

Unlike a typical construction project, every bucket of soil removed had the potential to reveal irreplaceable evidence of Roman life, from masonry and foundations to drainage systems and artefacts that have remained undisturbed for centuries.

Using conventional excavation equipment would have introduced an unnecessary level of risk.

A mechanical excavator can remove large volumes of material quickly, but it cannot distinguish between soil and fragile archaeological remains. Even a single pass of an excavator bucket could permanently damage features that have survived for almost two millennia.

The project demanded an excavation solution that balanced construction progress with heritage preservation.

The Solution

Pier deployed a vacuum excavation team to undertake the initial excavation works using a non-destructive digging method.

Rather than relying on mechanical force, the vacuum excavator carefully loosened and removed material in a controlled manner, allowing the on-site archaeologist to inspect each stage of the excavation as it progressed.

This collaborative approach meant that any archaeological features could be identified, recorded and protected before excavation continued.

By combining precision excavation with continuous archaeological supervision, the project team was able to progress safely while maintaining the integrity of the Roman remains beneath the site.

Why Vacuum Excavation?

Vacuum excavation is widely recognised for safely exposing underground utilities, but its precision also makes it an invaluable solution on archaeologically sensitive sites.

Key advantages included:

• Non-destructive excavation with significantly reduced risk of damage
• Precise, controlled removal of soil and overburden
• Minimal vibration and ground disturbance
• Continuous archaeological inspection throughout the excavation
• Improved protection for buried structures and artefacts
• A safer, more controlled alternative to mechanical excavation

Where traditional excavation prioritises speed, vacuum excavation delivers accuracy, making it the ideal choice whenever what lies beneath the surface cannot be replaced.

The Outcome

Pier successfully supported the school’s extension project while helping preserve and uncovering more of Caerleon’s remarkable Roman heritage.

Working alongside the project’s archaeologist ensured that excavation could continue responsibly, protecting archaeological remains while allowing the construction programme to move forward.

The project demonstrates how vacuum excavation can play a pivotal role far beyond utility avoidance. In environments where history lies beneath the surface, precision excavation provides contractors and clients with the confidence to build responsibly without compromising the past.

Project Highlights

• Location: Caerleon, Wales
• Sector: Education & Heritage
• Service: Standard Vacuum Excavation
• Challenge: Excavation within a nationally significant Roman archaeological area
• Solution: Non-destructive vacuum excavation carried out alongside archaeological supervision
• Outcome: School extension progressed while preserving the integrity of buried Roman remains

Looking Below the Surface

By choosing vacuum excavation over traditional digging methods, the project team reduced the risk of irreversible damage to nationally important archaeology while ensuring essential construction work could continue safely.

For Pier, it’s another example of delivering precision excavation where accuracy matters most, whether protecting critical underground infrastructure or preserving the history beneath our feet.