Risk Assessment for Deep Excavation (UK) – Generate in Minutes
By the Riskora Editorial Team · Reviewed against our editorial standards · Last reviewed
Generate a structured risk assessment for deep excavation work — covering trench collapse prevention, shoring and support systems, service detection, groundwater management, and plant proximity controls.
UK (RAMS) example document — Two-Storey Rear Extension — 14 Birchwood Lane, Reading. Client: Mr & Mrs A. Whitfield (Private Client). Site: 14 Birchwood Lane, Reading, RG1 5JT. Scope: Construction of a two-storey rear extension (6.4m × 4.2m) to an existing semi-detached dwelling. Works comprise breaking out of existing rear elevation, trench-fill foundations to 1.0m, traditional cavity blockwork to first floor, pre-stressed concrete lintels, timber roof structure with natural slate finish, plus alterations to existing rear wall to form structural opening with rolled steel joist (RSJ 203×102 UB23). Works programmed over 9 weeks with a peak site team of 6 operatives. Hazards assessed: Manual handling — blocks, lintels, plasterboard, Working at height — independent scaffold & roof structure, Buried services strike during excavation, Collapse of excavation / trench wall, Hand-arm vibration (HAVS) — breaking out, drilling, Silica dust — cutting blocks, brick, concrete, Vehicle/pedestrian segregation — narrow domestic street.
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What should a deep excavation risk assessment include?
A deep excavation risk assessment must cover the excavation depth and dimensions, soil type and stability assessment, support system selection (battering, stepping, trench sheets, hydraulic shoring), service detection and avoidance procedures, groundwater assessment and dewatering, edge protection and access arrangements, proximity of adjacent structures and their foundations, plant operating near excavation edges, and rescue arrangements for persons falling into or trapped in excavations.
Deep Excavation Kills — Usually Through Collapse
Excavation collapse is one of the most foreseeable yet frequently fatal incidents in construction and groundworks. A cubic metre of soil weighs approximately 1.5 tonnes — enough to crush and suffocate a worker in seconds. Collapse can be triggered by surcharge loading (plant or materials near the edge), vibration, water ingress, or simply failing to support an excavation that was deeper than expected. Deep excavations also concentrate other risks — service strikes are more likely as depth increases, access and egress become more difficult, and rescue in the event of collapse is extremely challenging. Many professionals are unsure about the legal requirements for safety documentation.
How Riskora Helps
Riskora generates deep excavation risk assessments that address soil classification, support system selection, service detection, groundwater management, and rescue planning. Specify your excavation depth, ground conditions, and proximity to services and structures, and the tool generates a comprehensive risk assessment with proportionate controls for the depth and conditions you're working in. You can also use our standalone risk assessment builder or method statement tool.
Who it's for
- Groundworks contractors assessing deep foundation and drainage excavations
- Utilities contractors evaluating excavation risks for deep service installations
- Principal contractors reviewing excavation risk assessments from subcontractors
- Civil engineering teams managing deep excavations for structures and bridges
- Temporary works coordinators specifying shoring and support systems
Understand the Fundamentals
Before you generate your document, these guides cover the knowledge that underpins every good RAMS, risk assessment, and method statement.
UK Legal Requirements for Risk Assessments
What the law requires for risk assessments under MHSWR 1999 and when they must be recorded.
RAMS vs Risk Assessment
When a standalone risk assessment is enough and when you need a full RAMS document.
How to Write a RAMS Document
If your risk assessment needs to be part of a RAMS, this guide covers the full structure.
What Is a RAMS Document?
Learn how risk assessments fit within the RAMS framework used across UK construction.
Construction Safety Documents Explained
An overview of the key safety documents required on UK construction sites and how they relate to each other.
RAMS vs Risk Assessment — Key Differences
When you need a full RAMS versus a standalone risk assessment, and how the two documents work together.
At what depth do excavations need support?
There is no fixed depth at which support becomes a legal requirement — the Regulations require that excavations are supported where there is a risk of collapse. In practice, most excavations over 1.2m deep require some form of support (battering, stepping, shoring, or trench sheets), but collapse can occur at shallower depths in poor ground conditions. The risk assessment must evaluate the specific soil conditions, not rely on a generic depth threshold.
What types of excavation support are available?
Common support methods include: battering back the sides to a safe angle (typically 45° or shallower depending on soil), stepping in stages, trench sheets driven behind steel walings, hydraulic shoring frames (quick and adjustable), and sheet piling for deep or water-bearing excavations. Your risk assessment should justify the selection based on soil type, depth, duration, and site constraints.
Key Risks and Considerations
- •Trench collapse — sudden failure of unsupported or inadequately supported excavation sides
- •Buried alive — engulfment and suffocation following collapse
- •Service strikes — gas, electric, water, telecoms at varying depths
- •Falls into excavation — from unprotected edges
- •Groundwater flooding — destabilising excavation sides and creating drowning risk
- •Plant overrun — excavators or vehicles falling into or collapsing the edge of excavations
- •Adjacent structure damage — undermining foundations of nearby buildings or roads
- •Manual handling — working with shoring equipment, pipes, and materials in confined trench spaces
- •Toxic atmosphere — gas accumulation in deep excavations, especially near landfill or contaminated ground
Key Features
- Excavation depth and soil type assessment tools
- Support system selection guidance
- Service detection procedure templates
- Groundwater management controls
- Edge protection and access specifications
- Plant proximity setback distances
- Inspection regime templates
- Download to PDF
Example Structure (UK Standard)
- Excavation description (depth, width, length, duration)
- Ground investigation and soil classification
- Support system selection and specification
- Service detection procedures and results
- Groundwater assessment and dewatering plan
- Edge protection and access arrangements
- Plant proximity controls (minimum setback distances)
- Adjacent structure assessment
- Hazard identification with risk ratings
- Control measures
- PPE requirements
- Rescue plan for persons in excavation
- Inspection regime (daily, post-weather, post-event)
- Emergency procedures
Common Questions Before Getting Started
Will this take long?
Under 5 minutes. Select your trade, pick hazards, download.
Is it complicated?
No training needed. The guided builder walks you through every step.
Do I need experience?
If you know what work you're doing, you can use Riskora.
Is it free to try?
Yes. The Free plan needs no card — generate, review and download one free PDF. Upgrade any time for branding, DOCX, sign-off and higher limits.
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All documents generated by Riskora should be reviewed by a competent person before use on site. Riskora provides structured templates — professional judgement is always required.
"Trench collapse gives no warning. One moment the ground looks stable. The next, 1.5 tonnes of soil per cubic metre is on top of someone. The risk assessment is the only thing standing between those two moments."
What your RAMS actually contains
Riskora builds a structured, client-facing document — not a generic AI paragraph. Every section is shaped around your job, your site and your team.
Hazards
Task-specific hazards for the job, captured row by row — not a generic list pulled from an old RAMS.
Controls
Control measures mapped to each hazard with residual risk scoring after controls are applied.
PPE
PPE requirements tied to the activity and site, ready to brief to the team.
Method steps
Step-by-step method statement structured around how the work is actually sequenced on site.
Emergency arrangements
First aid, rescue plan, emergency contacts and site-specific escalation routes.
COSHH prompts
Substance prompts when the work involves chemicals, dusts, fumes or sealants — flagged early, not missed at review.
Sign-off
Operative sign-off captured against the document — names, dates and acknowledgement of the brief.
Version history
Every change tracked so you can show what was issued, when, and which version the team signed.
Approval status
Clear approval state on every document — draft, in review, approved, issued — visible across the team.
Audit trail
Who created it, who reviewed it, who signed it. A complete trail you can hand to a principal contractor or auditor.
From copied-and-pasted to site-specific
The reason RAMS get rejected is rarely the format — it's that the document is obviously generic. Riskora rebuilds it around this job, this site and this task.
Generic template copied from an old job.
- • Hazards and controls that don't match this site or task.
- • Method steps written for a different sequence of work.
- • No emergency arrangements specific to the location.
- • Client flags it as generic and asks for a rewrite.
Site-specific document structured around this job, site and task.
- • Hazards captured from the actual scope you pasted in.
- • Method steps sequenced for how the work runs on site.
- • Emergency arrangements and rescue plan tied to the location.
- • Approved internally, briefed to the team, signed off and stored.
From job details to signed-off document
A four-step workflow used by contractors, consultants and safety teams to turn informal job details into client-ready safety paperwork.
- 1Paste job details
Drop in a client email, a WhatsApp from the site manager, a scope of works or a tender note. Anything that describes the job.
- 2Riskora structures the document
Riskora turns your brief into hazards, controls, method steps, PPE, emergency arrangements and COSHH prompts.
- 3Review, edit and download
You stay in control of every section. Tweak anything, then download a clean PDF or share a link.
- 4Brief the team and record sign-off
Brief operatives, capture their sign-off and keep a full audit trail of who signed which version.
Built by people who've written this paperwork on real sites
Riskora is built by a founder with hands-on site and document experience — designed for contractors, consultants and safety teams who need to issue, brief and prove safety paperwork without losing a day to admin.
- Built for contractors, consultants and teams
Solo trades, principal contractors and in-house safety teams all run on the same workflow. - Supports multiple countries
UK, Ireland, Australia, New Zealand, US and Canada — wording and document types match the local standard. - Not just documents
Sign-off, approvals, version history and an audit trail — the management workflow around the paperwork.
Frequently Asked Questions
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No training. No complex setup. Just select your trade and go.
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References & Further Reading
Primary UK sources covering the legal and practical framework behind RAMS, risk assessments and method statements.
Create your RAMS free — preview before sign-up
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Final RAMS must be reviewed and approved by a competent person before use.
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.