Striking live services is one of the quickest ways to turn a straightforward dig into a shutdown, an injury, or a very expensive repair. A permit-to-dig done properly is more than a form; it’s a live control on how, where, and when you break ground. It sets the boundaries, confirms what’s been located, and defines the stop rules before plant even starts. The key is to build a permit around real on-site verification and supervision, not just utility plans and guesswork.
TL;DR
/>
– Get all utility info early, then prove it on the ground with competent detection and trial holes.
– Make the permit site-specific: marked-up drawings, photographs, hold points, and named supervisors.
– Use the right kit: CAT and generator, vacuum excavation where feasible, and hand-dig in the risk zone.
– Control the day: exclusion zones, banksman, live markings, and a clear stop/escalate rule for anything unknown.
– Revalidate after changes, weather, or shift swaps; close out with as-built records.
Permit-to-dig controls that actually stop strikes
# Stage 1: Gather and judge the utilities picture
/> Request up-to-date utility records early and expect delays. Stitch together client data, statutory plans, as-built information, and any previous survey results. Walk the area and look for visual clues: covers, signs, kiosks, street furniture, and recent reinstatement patches. Treat records as indicative only and record gaps or conflicts in the permit pack.
# Stage 2: Locate, verify, and mark what’s really there
/> Use competent people and suitable locating equipment to scan the dig area, including active and passive modes. Mark identified services with paint or pins, reference them to fixed points, and photograph the set-out. Prove the route and depth at key points with hand-dug or vacuum-excavated trial holes. Capture all of this in the permit with sketches and agreed no-go corridors.
# Stage 3: Design the dig sequence and protect services
/> Plan the excavation method around what you found, not what’s most convenient for plant. Build in safe stand-off distances, and choose vacuum excavation or hand-digging where clearances are tight. Factor in temporary works for trench support and any service crossing protection. Align traffic management to keep plant out of service corridors and maintain pedestrian/plant separation.
# Stage 4: Issue a live permit, not a paper exercise
/> The permit should contain marked-up drawings, photos of markings, trial-hole logs, and named responsibilities. Include hold points (for example, stop before crossing a marked route) and limits (depth, zone, plant type). Brief the team on the ground with the physical markings in front of them, not in a cabin. Confirm competence of the locator and the dig team, and agree signals with the banksman.
# Stage 5: Control change, stop early, and escalate clearly
/> If markings are lost, plans don’t match, or an unknown service is exposed, stop. Re-scan, re-brief, and reissue the permit before resuming. Revise the method if weather, lighting, or ground conditions change. Escalate suspected high-risk services to the site manager and utility owner; don’t “just nudge past it”.
# Stage 6: Close out and leave a trace
/> Once the dig is complete, update the drawings with what was found or diverted. Photograph protection measures and reinstatement. Cancel the permit formally so it can’t be reused by mistake. Hand over the records to the principal contractor for the health and safety file or asset owner.
A weekday morning on a housing civils plot
/> On a mixed-tenure housing site, the drainage crew is booked to install a lateral across a footpath to a new build. Utility plans show a telecom duct somewhere nearby, but the area has been reconfigured across phases. The supervisor arranges a scan; the locator picks up a strong signal running diagonal to the planned trench. Trial holes confirm a shallow data duct offset from the plan by a couple of metres. The method is tweaked: vacuum excavate to 1 m either side of the crossing, lay timber matting over the duct, and adjust the trench line by 300 mm to keep a safe buffer. The permit includes a hold point at the crossing with the supervisor present and the banksman in position. The crew hits programme without a strike, and the as-built notes the true route for later plots.
Permit-to-dig essentials: supervisor checklist
/>
– Confirm utility plans are the latest provided and stamped into the permit pack.
– Walk the line of the dig and brief at the markings, not just on drawings.
– Verify trial holes at changes of direction, connections, and crossing points.
– Set plant exclusion zones around service corridors and keep them coned and visible.
– Agree hand-dig or vacuum excavation in the risk zone and enforce the limit.
– Nominate a single point of control for stop/escalate decisions on the day.
– Capture photographs of the markings and trial holes before breaking ground.
Common mistakes that lead to strikes
# Treating utility plans as exact locations
/> Plans are for guidance; ground truthing is non-negotiable. Relying on a coloured line instead of a locator and trial holes is false economy.
# Issuing permits from the office
/> Permits signed off away from the workface miss site realities. A permit must be issued after physically confirming markings and briefings.
# Hand-digging done by the newest labourer
/> Hand-digging near services is a skilled task. Put competent, briefed people on it and supervise continuously at crossings and in congested zones.
# Losing markings to weather and traffic
/> Rain, spoil, and tyre tracks can erase critical lines. Protect and refresh markings, and stop if they’re not readable.
This week’s focus before the first bucket
/>
Five moves to make before the trench goes in
– Pin down survey time: book a competent locator with enough hours to scan the whole footprint and a day in hand for trial holes.
– Ringfence plant routes: set temporary barriers to keep machines out of suspected corridors until verification is complete.
– Stage materials: place pipes, shoring, and spoil areas away from marked services to avoid accidental over-run.
– Brief the banksman: agree hand signals, no-go zones, and hold points; make overhead and buried service risks part of the same conversation.
– Line up vacuum kit: if you can’t secure it, adapt the sequence to keep mechanical digging outside the risk zone until you can.
Bottom line on live service risk
/> A permit-to-dig only works when it reflects what’s in the ground and is policed at the trench edge. Build the permit around proof, make it visible, and expect to stop and rethink when facts change. Enforcement attention remains on service strikes and supervision quality; keep your controls live and your stop rules strong.
FAQ
# When is a permit-to-dig actually required?
/> Any ground penetration where services may be present should trigger a permit, from trial pits to fence posts to full excavations. If you’re unsure, treat it as needed and scale the controls to the risk. The aim is to ensure verification, briefings, and stop rules are in place before breaking ground.
# Who should carry out service detection?
/> Use a competent person with suitable equipment and the time to do it properly. They should understand limitations, scan systematically, and record findings clearly. Supervisors should witness key points so the brief is based on what was actually found.
# How do we manage permits across shift changes?
/> Re-brief at the workface with the markings visible, and confirm the permit is still valid for the exact area and scope. If markings have faded, conditions changed, or the method has shifted, pause and revalidate. New starters must get the same briefing and understand the stop/escalate rule.
# What if we find an uncharted cable or pipe?
/> Stop and make the area safe, then reassess with a locator and trial hole to identify the service. Escalate to the site manager and, where appropriate, contact the utility owner before proceeding. Update the permit and drawings and only restart once controls are adjusted and briefed.
# Is vacuum excavation always required near services?
/> It’s a strong control where space and access allow, but it’s not always practical. Where vacuum kit isn’t feasible, use hand-digging in the risk zone with competent people, slow progress, and constant supervision. The key is to choose a method that keeps energy low near services and maintains stand-off wherever possible.
