Excavation and intrusive works on live industrial sites, major construction projects and infrastructure often depend on an accurate understanding of what exists at and below ground level. Site levels, surface features, buried constraints, and interfaces with existing assets all influence how designs develop and where risk ultimately sits.
This solution is applied when teams require a dependable understanding of site and subsurface context to inform design, planning, and safe intervention — particularly where existing records are incomplete, outdated, or lack sufficient detail for informed decisions.
Ground-related risk is frequently underestimated at early design stages. Legacy drawings may not reflect current site conditions, surface levels may have changed, and buried services or obstructions may be undocumented or inaccurately recorded.
Where site information is limited to basic or outdated surveys, engineers, contractors and duty holders are forced to make assumptions about levels, interfaces, and clearances. These assumptions often unravel once excavation or construction begins, when options are limited and consequences escalate quickly.
The challenge is establishing a sufficiently rich understanding of site and subsurface conditions early enough to support design decisions — without discovering critical constraints only once work is underway.
Ground & Subsurface Risk Assessment is applied where evidence is required before excavation or intrusive works on live sites, major construction projects and infrastructure.
Where buried services are a risk, Phase establishes their location, depth and nature before work proceeds. Coverage is adapted to the asset, governance model, and level of assurance required, but typically includes:
This solution supports decision-making and design development. It does not replace statutory responsibility, permitting, or duty-holder obligations.
Where surface context interfaces directly with buildings or structures, enhanced site information may be aligned with building geometry. This solution remains focused on site and ground context; representation of buildings themselves is addressed separately.
The examples below illustrate how site and subsurface risk is assessed in practice. The level of detail is selected to suit access, programme, and the decisions being supported — ranging from surface definition for early design through to enhanced subsurface understanding where risk and consequence are higher.
Teams gain a clearer picture of site and subsurface conditions before designs are fixed. Design decisions are based on checked levels, interfaces, and feasibility, reducing the likelihood of late discovery and reactive change.
Where enhanced subsurface information is required, project teams are able to work against evidence-based site context rather than incomplete records — supporting safer, more efficient progression from concept through to delivery.
Phase operates from Aberdeen, supporting ground and subsurface risk assessment across Scotland and the UK.
Need a survey of a building or development site? That’s Phase Surveys, our property survey division. Existing clients, keep contacting us as usual.
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