Risk Assessment for Excavation Near Utilities — London

UK construction-safety guidance by the Riskora Editorial Team

London's underground is one of the most congested utility environments in the world. Beneath every street lies a dense network of Victorian sewers, high-voltage cables, gas mains, fibre optics, and water services — many of which are unmapped or inaccurately recorded. If you are excavating in London, the risk of striking an underground service is exceptionally high, and the consequences can be fatal.

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Example Risk Assessment

Risk Assessment for Excavation Near Utilities — London

  • Excavation location, depth, and method
  • Utility survey results: desk study, CAT & Genny, GPR, trial holes
  • Known services and their depths, materials, and operating conditions
  • Persons at risk: operatives, public, adjacent property occupants
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When This Document Is Required

Under the Management of Health and Safety at Work Regulations 1999, a risk assessment must be completed before any excavation near utilities begins. HSG47 provides specific guidance on avoiding danger from underground services. In London, additional requirements may apply under Transport for London regulations, the Highways Act, and local borough permit conditions. The risk assessment must be based on utility survey data — not just record drawings — and must be specific to the excavation location, depth, and method.

What Must Be Included

  • Excavation location, depth, and method
  • Utility survey results: desk study, CAT & Genny, GPR, trial holes
  • Known services and their depths, materials, and operating conditions
  • Persons at risk: operatives, public, adjacent property occupants
  • Control measures: hand digging, mechanical restrictions, safe distances
  • Risk ratings for each identified service (cable strike, gas escape, flooding)
  • Emergency procedures and utility company emergency contact numbers
  • Coordination with TfL, borough highways, and utility companies
  • PPE requirements: insulated tools, anti-static clothing near gas services

Common Mistakes to Avoid

  • Trusting record drawings as accurate — London's utility records are notoriously incomplete
  • Not conducting physical surveys (CAT & Genny at minimum) before every excavation
  • Mechanically excavating within hand-dig zones near identified services
  • Not checking for abandoned or decommissioned services that may still be energised
  • Failing to coordinate with TfL when working near London Underground infrastructure
  • Not having utility company emergency numbers immediately available on site

Example Scenario

A civils contractor is excavating trial holes for a new development in central London. The desk study reveals eight separate utilities crossing the excavation area, including a 132kV cable and a cast iron gas main. Using Riskora, the site engineer generates a risk assessment covering each service, specifying safe digging methods, emergency procedures for cable strike and gas escape, and coordination arrangements with UKPN and Cadent — all within minutes.

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Riskora is an assistive document preparation tool. All documents generated must be reviewed, verified, and approved by a competent person before use on site. Riskora does not replace professional safety judgment, and no output should be treated as a legal compliance guarantee.