BUR/Detection/TBT-BUR-012

Permit to Dig Process

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Permit to Dig Process

Toolbox Talk Record

Ref: TBT-BUR-012  |  Issue: 1  |  Date: March 2026
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What?

  • A permit to dig is a formal document authorising excavation work after hazards have been identified and controlled.
  • HSG47 recommends a permit to dig system as best practice for all ground disturbance operations.
  • The permit ensures that service plans have been reviewed and services located before digging commences.
  • It records the detection equipment used, services found, agreed safe digging methods, and exclusion zones.
  • The permit must be issued by a competent person and accepted by the operative carrying out the dig.
  • All permits have a defined validity period and must be re-issued if conditions or location change.
  • The permit should reference the service plan drawing number and CAT/Genny survey results.
  • Mechanical excavation restrictions within defined distances of known services must be specified.
  • Emergency procedures for a service strike must be documented and understood before the permit is issued.
  • A permit to dig does not guarantee the area is free of services — it documents the precautions taken.

Why?

Prevent service strikesA formal permit system ensures every excavation is planned with service avoidance measures in place.
Legal complianceHSG47 and CDM 2015 require safe digging procedures — a permit system provides documented evidence of compliance.
Protect workersStriking a gas main, electrical cable, or high-pressure water main can cause fatal injuries instantly.
Do Don't
  • Obtain a permit to dig before starting any ground disturbance operation
  • Review utility service plans for the area and mark known services on site
  • Scan the dig area with CAT and Genny equipment and record the findings
  • Specify hand dig zones and mechanical exclusion distances on the permit
  • Brief the excavator operator and ground workers on the permit conditions
  • Keep the permit available at the point of work throughout the operation
  • Re-issue the permit if the dig location, depth, or method changes
  • Record the permit number, date, and names of issuer and acceptor
  • Include emergency strike procedures on the permit for quick reference
  • Close out the permit formally when the excavation work is complete
  • DON'T dig without a valid permit to dig in place and signed off
  • DON'T accept a permit if you have not been briefed on its conditions
  • DON'T rely on the permit alone — always scan with CAT and Genny before digging
  • DON'T extend the dig beyond the area shown on the permit without re-issue
  • DON'T use mechanical excavation within the restricted zone of known services
  • DON'T assume old permits are still valid — check the expiry date
  • DON'T allow operatives without permit training to issue or accept permits
  • DON'T ignore unmarked services found during the dig — stop and re-assess
  • DON'T leave the permit in the site office — it must travel with the work
  • DON'T continue digging if the conditions described on the permit have changed

See also: Safe Digging Practices (HSG47) | CAT and Genny Safe Use
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