What Happens If UXO Is Found on a Construction Site?

What Happens if UXO Is Found on a Construction Site?

Unexploded ordnance (UXO) is occasionally discovered during construction and excavation works across the UK.

These items may remain from wartime bombing campaigns, military training activity or historical defence infrastructure.

When suspected ordnance is discovered on a construction site, work must stop immediately until the item has been assessed and managed safely.

Understanding the correct procedures helps ensure the safety of personnel while minimising disruption to the construction programme.

Immediate Actions if Suspected UXO Is Found

If a suspicious object is exposed during excavation or groundworks: • Stop work immediately and do not touch, move or disturb the item
• Switch off nearby plant only if this can be done without approaching it
• Withdraw, prevent access and establish an appropriate exclusion area
• Inform the site manager or supervisor
• Call 999, ask for the police and report suspected unexploded ordnance
• Follow the instructions given by the emergency services UXOS can provide supporting technical advice, but an emergency discovery must first be reported to the police.

Why Construction Sites Encounter UXO

UXO can remain buried underground for many decades following wartime activity.
Construction and development projects may encounter ordnance when excavation reaches previously undisturbed ground.
Common risk environments include:

• Areas affected by wartime bombing
• Former industrial or transport infrastructure
• Redevelopment of brownfield land
• Sites near historic military facilities or airfields
• Deep excavations for foundations or services

How UXO Specialists Manage the Risk

When suspected ordnance is reported, UXO specialists attend the site to assess the object and determine the appropriate course of action.
This may involve:

• Visual assessment of the item
• Identification of potential ordnance types
• Implementation of safety procedures
• Liaison with emergency services if required.

In many cases, the item may turn out to be harmless scrap metal or construction debris.
However, specialist assessment is essential to ensure site safety.

Preventing Construction Site Delays

The best way to avoid disruption caused by UXO is to identify potential risk before construction begins.

UXO risk assessments and mitigation measures can be implemented during the planning and pre-construction phases of a project.

Early identification allows developers and contractors to manage risk safely without unexpected delays during excavation works.

Need Advice If UXO Is Found on Your Site?

If suspected ordnance has been discovered on your construction site, specialist advice should be obtained immediately.

Why Choose UXOS?

UXOS provides professional UXO risk mitigation services for construction and infrastructure projects across the UK.
Our experienced EOD specialists support developers, contractors and project teams by assessing and managing unexploded ordnance risk on site. We work closely with construction teams to ensure projects proceed safely and efficiently.