What Is Safe Digging?
Safe digging refers to the controlled excavation of ground in a way that prevents damage to buried services, protects workers from collapse, and ensures compliance with HSE safety standards.
It’s an essential part of ground investigation, construction, and utility work. Particularly where trenches, foundations, or trial pits are required near live services or unstable ground.
At TS Site Investigation, we take a safety-first approach to all excavation activities. Our procedures combine accurate utility location, qualified supervision, and secure shoring systems to ensure every excavation is carried out safely and efficiently.
Why Safe Digging Includes Temporary Works Planning?
Safe digging is more than exposing buried services — it often requires temporary works such as shoring, trench support, and stabilisation systems to protect personnel and maintain ground stability in deeper or unstable excavations. Temporary works is a key part of safe excavation, particularly when working near utilities, foundations, or in confined spaces where ground movement could pose risk.
We can assist clients with temporary works planning and coordination to ensure safe excavation. This includes liaison with qualified temporary works designers and, where required, support through Temporary Works Co-ordinator (TWC) and Temporary Works Supervisor (TWS) roles to help integrate safe digging activity with broader project requirements.
Whether temporary works design is managed by your engineering team or coordinated through specialist partners, we can support the process, helping identify when shoring, trench plates, or engineered support systems are needed and ensuring continuity from design through site implementation.
How We Carry Out Safe Digging
Safe digging starts well before any excavation takes place. Prior to developing site-specific documentation, we review all available information to understand the ground conditions, surrounding environment, and potential risks associated with excavation.
This early-stage assessment typically considers:
Available ground investigation data, including soil stratigraphy and groundwater conditions
The proximity of existing structures, walls, foundations, and slabs that may be affected by excavation
Buried services that could influence excavation sequencing or support requirements
Excavation depth, geometry, and access constraints that may affect ground stability and loading
Where excavations are deeper, constrained, or located close to structures or live services, temporary works may be required to maintain stability and protect personnel and adjacent assets. In such cases, we can assist with the coordination of temporary works design, working alongside suitably qualified designers to ensure the proposed support systems are appropriate for the ground and site conditions.
Once the engineering considerations have been reviewed and any required temporary works arrangements identified, we develop a site-specific Risk Assessment and Method Statement (RAMS) in accordance with CDM 2015.
Our safe digging process includes:
Utility detection and mapping using CAT & Genny and, where required, Ground Penetrating Radar (GPR)
Marking and permitting of excavation zones to ensure exclusion and no-dig areas are clearly defined
Controlled excavation, typically commencing with hand digging or vacuum excavation to safely expose services before mechanical excavation
Trench support and shoring, such as trench boxes, hydraulic braces, or sheet piles, where ground conditions or excavation depth require temporary support
Ongoing monitoring, including observation for ground movement, water ingress, and changes to exposed services
Backfilling and reinstatement, restoring excavations once inspections, sampling, or testing have been completed
All works are supervised by trained operatives and site managers with experience in geotechnical, structural, and temporary works-controlled environments.
Applications
Safe digging practices are fundamental for:
Trial pits and foundation exposures near live services or structures
Service identification ahead of piling, boreholes, or construction activities
Soakaway and infiltration testing (including BRE 365)
Trench excavations requiring temporary support or controlled access
Infrastructure and utility works where buried assets or adjacent structures are at risk
Why Safe Digging Matters?
Excavation and trenching are among the highest-risk activities within construction and ground investigation. Uncontrolled excavation can lead to service strikes, ground instability, damage to adjacent structures, and serious safety incidents. Even relatively shallow excavations can present significant risk where buried services, groundwater, or variable ground conditions are present.
Effective safe digging procedures reduce these risks by ensuring excavations are planned, supported, and monitored in line with recognised standards and best practice. When implemented correctly, safe digging helps to:
Prevent damage to buried services, reducing the risk of injury, service disruption, and unplanned remedial works
Protect site personnel and third parties, while maintaining compliance with HSE guidance and CDM 2015 requirements
Maintain ground stability and control, particularly in confined or sensitive locations
Deliver reliable ground information with minimal disturbance to the surrounding environment
Why Choose TS Site Investigation?
We adopt a structured and engineering-led approach to safe digging, integrating planning, risk management, and site control throughout each stage of the works.
Our approach includes:
Site-specific RAMS developed in accordance with CDM 2015 and HSG47 utility avoidance guidance
Trained operatives experienced with controlled excavation methods and temporary works execution support
Modern utility detection and verification techniques (CAT & Genny, GPR) for accurate service mapping
Coordination with temporary works designers where required to ensure compliant and stable excavation support systems
Our reputation is built on doing things the right way — safely, efficiently, and transparently.
FAQs
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Yes — safe digging is still required.
Utility drawings are often:Outdated
Inaccurate in location or depth
Missing private services or recent modifications
Because of these inconsistencies, HSE guidance insists that:
Drawings alone cannot be relied upon — utilities must be located, traced, and safely exposed on site.
Safe digging provides physical verification and ensures full compliance with HSG47, CDM 2015, and client safety requirements.
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Yes — TS Site Investigation specialises in confined-space and restricted-access safe digging.
Our team can work safely using:Confined-space entry procedures
Low-vibration and non-mechanical tools
Vac-ex / suction excavation (if requested)
Trench boxes, hydraulic bracing, and temporary supports
This allows safe excavation in basements, plant rooms, narrow alleyways, service corridors, and other challenging environments without compromising safety or accuracy.
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Vacuum excavation is often the safest method for excavating around live services because it:
Removes soil without mechanical impact
Lowers the risk of damaging fragile utilities
Works well in congested service zones
We can provide vacuum excavation where required or requested, and combine it with hand digging for final precision exposure.
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Temporary works may be required where excavation could affect ground stability, nearby structures, or the safety of personnel. This commonly includes deeper excavations, works close to buildings or walls, poor or variable ground conditions, groundwater presence, confined spaces, or excavations near live services. In these situations, temporary support such as trench boxes, bracing, or sheet piling may be necessary to maintain stability and control risk.
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Item descSafe excavation is guided by UK legislation and industry standards, including CDM Regulations 2015, HSG47 – Avoiding Danger from Underground Services, HSG150 – Health and Safety in Construction, BS 5975 for temporary works management, and relevant BRE guidance. These frameworks ensure excavations are properly planned, supported, and managed to reduce risk.ription