Excavation Risk Assessment Template: What UK Contractors Must Cover
Searching for an excavation risk assessment template is a sensible starting point — but the template is only as good as the thinking behind it. This guide explains what UK law requires, which hazards your assessment must address, and how to structure controls so your document holds up on site and under scrutiny.
The Legal Basis
The duty to carry out a suitable and sufficient risk assessment before excavation work begins comes from Regulation 3 of the Management of Health and Safety at Work Regulations 1999. If employees are involved, that duty falls on the employer; self-employed contractors must assess risks to themselves and others affected by their work.
Where the excavation is part of a construction project, CDM 2015 adds further requirements: the principal contractor must plan, manage and monitor the work, and significant hazards must be recorded in the construction phase plan. If the work involves hazardous substances (contaminated ground, fuel vapour, hydrogen sulphide), COSHH 2002 requires a separate substances assessment feeding into the broader risk assessment.
A completed risk assessment combined with a written method statement forms your RAMS — the document package most principal contractors and clients will ask for before you break ground.
Core Hazards an Excavation Risk Assessment Must Address
A generic template only becomes useful once you've worked through the specific hazards for your site. The following are the categories the HSE expects you to consider:
1. Collapse and Ground Movement
Trench collapse is the leading cause of excavation fatalities in the UK. Your assessment must consider:
- Soil type and cohesion (clay behaves very differently from granular fill)
- Depth and width of the excavation
- Surcharge loads — plant, stored materials, vehicles near the edge
- Weather (prolonged rain dramatically reduces stability)
- Proximity to existing structures or other excavations
Controls follow the hierarchy: eliminate the need to enter the excavation where possible (remote techniques, vacuum excavation); engineer support into the design (trench boxes, shoring, battering/benching to safe angles); administrative controls (daily inspection by a competent person before entry, no entry during adverse weather); PPE (hard hat, safety footwear) as the last layer, not the main protection.
2. Buried Services
Striking a live cable, gas main or water main is a foreseeable and serious risk. Your template should record:
- Utility searches completed (dial-before-you-dig, LSBUD, statutory undertaker records)
- CAT and Genny sweep results and date
- Safe digging practice: mechanical excavation to within 500 mm of a known service, hand digging to expose it
3. Persons and Vehicles Falling In
- Edge protection: barriers, stop blocks for vehicles
- Safe means of access and egress (ladder secured and extending 1 m above the stepping-off point — this also engages Work at Height Regulations 2005 where the excavation edge presents a fall risk)
- Signage and lighting for public-facing sites
4. Flooding and Groundwater Ingress
- Pumping arrangements
- Pre-work check of drainage plans and water table data
- Prohibition on entry during active flooding
5. Contaminated Ground and Atmosphere
- Desk study and site investigation results
- Atmospheric monitoring (oxygen depletion, flammable or toxic gases) if confined conditions exist
- COSHH assessment for any identified contaminants
- Emergency rescue arrangements — never send a rescuer in without a plan
6. Plant and Pedestrian Conflict
- Defined exclusion zones around excavating plant
- Banksman requirements
- Segregated pedestrian routes
What a Solid Template Structure Looks Like
| Section | What to Include |
|---|---|
| Project and site details | Location, client, works description, date of assessment |
| Competent person | Name and role of assessor |
| Hazard identification | Each hazard listed above, plus site-specific additions |
| Risk rating | Likelihood × Severity (before and after controls) |
| Control measures | Specific, not vague — name the shoring system, not just "use support" |
| Residual risk rating | Post-control rating demonstrating ALARP |
| Review trigger | When the assessment will be reviewed (changed conditions, near miss, weekly as a minimum on live excavations) |
| Signatures | Assessor, supervisor, operatives briefed |
Common Mistakes That Undermine an Excavation Risk Assessment
- Copy-paste controls that don't reflect the actual ground conditions or depth
- Listing PPE as the primary control rather than the last resort
- No record of who has read and understood the assessment
- Failing to update the assessment when conditions change mid-project (groundwater appears, an adjacent excavation opens up)
- Treating the daily pre-entry inspection as optional — HSE guidance is clear that excavations must be inspected by a competent person at the start of each shift, after any event likely to have affected stability, and after any accidental fall of material
Keeping the Assessment Useful on Site
A risk assessment buried in a site office folder protects nobody. Brief operatives from it at the start of work, display key controls at the excavation, and make the daily inspection record part of your site diary. When conditions change — and in excavation work they frequently do — update the document before work continues, not after.
A well-structured excavation risk assessment template gives you a consistent framework. The professional judgement you apply to it is what makes it a genuinely suitable and sufficient assessment under Regulation 3.