Ground Investigation, Boreholes and Site Risk Assessments
Geotechnical Site Investigation London
Phase 1 desktop studies, Phase 2 intrusive investigations, boreholes, trial pits, contamination testing and foundation recommendations for projects throughout London and Greater London.
Geotechnical Site Investigations in London
Before construction begins, it is important to understand the ground beneath the proposed development. Ground conditions can influence foundation design, drainage, retaining structures, construction cost and the overall feasibility of a project.
One Stop Consult coordinates professional geotechnical site investigations throughout London for homeowners, developers, architects, structural engineers and contractors.
Support is available from initial Phase 1 Desktop Studies through to intrusive Phase 2 investigations involving boreholes, trial pits, sampling, laboratory testing and foundation recommendations.
Ground Investigations Across London and Greater London
We support developments throughout Central London, Westminster, Kensington, Chelsea, Camden, Islington, Southwark, Lambeth, Greenwich, Stratford, Wimbledon and Ealing.
Nearby coverage also includes Croydon, Bromley, Barnet, Enfield, Harrow, Hounslow, Romford and surrounding Greater London areas.
Ground Investigation Services
How We Can Support Your London Project
The investigation scope is tailored to the development, site history, ground risks and information required by the project team.
01
Phase 1 Desktop Studies
Desk-based review of historical, geological, environmental and planning information to identify potential site risks.
02
Phase 2 Site Investigations
Intrusive investigations used to confirm the actual ground and contamination conditions beneath the site.
03
Borehole Investigations
Boreholes used to establish soil profiles, rock depth, groundwater conditions and ground strength.
04
Trial Pits
Excavated trial pits used to inspect shallow ground conditions, existing foundations and made ground.
05
Window Sampling
Compact intrusive sampling used to recover soil profiles and samples across accessible development sites.
06
Dynamic Probing
In-situ testing used to assess relative ground resistance and changes in soil strength with depth.
07
Groundwater Monitoring
Monitoring installations used to assess groundwater levels and seasonal conditions where required.
08
Contamination Testing
Soil sampling and laboratory analysis where historical or current land uses indicate contamination risk.
09
Foundation Recommendations
Practical foundation guidance based on the ground investigation findings and proposed development.
Phase 1 Desktop Studies
A Phase 1 Desktop Study is often the first stage of the site investigation process. It reviews available records without physically disturbing the ground.
The study develops an initial understanding of the site and can identify whether more detailed intrusive investigation is needed.
Phase 1 reports are commonly requested for planning applications, residential development, brownfield sites and locations with potential contamination or mining risks.
What the Desktop Study May Review
The exact searches depend on the site and development, but the report commonly considers the following sources and risks.
Historic land use
Geological mapping
Environmental records
Previous site uses
Potential contamination
Flood risk information
Coal mining history
Radon and ground stability
Phase 2 Intrusive Site Investigations
A Phase 2 investigation physically examines the ground using suitable intrusive techniques. It is normally designed around the risks and information gaps identified during the Phase 1 study.
The investigation can establish soil composition, bearing conditions, contamination, groundwater and other factors that may affect construction.
The resulting data can be used by structural engineers, environmental consultants, warranty providers and Building Control.
Boreholes
Deeper investigation of soil and rock profiles, groundwater and foundation conditions.
Trial Pits
Shallow excavations used to inspect near-surface soils and existing foundations.
Soil Sampling
Samples recovered for geotechnical or environmental laboratory testing.
In-Situ Testing
Field testing used to assess ground strength, density or penetration resistance.
Groundwater Monitoring
Monitoring used to record groundwater levels and possible changes over time.
Laboratory Analysis
Testing of soil properties, contamination concentrations and other relevant parameters.
Borehole Investigations
Boreholes allow engineers to investigate soil and rock conditions below the reach of shallow trial pits.
They are commonly used for larger residential, commercial and industrial developments or where deeper foundations may be required.
Soil profile and strata
Depth to competent ground
Rock depth and condition
Groundwater levels
Ground strength
Foundation suitability
Samples for laboratory testing
Monitoring installation where required
Contamination and Environmental Investigation
Former industrial, commercial, agricultural or waste-related land uses can leave contaminants within the soil or groundwater.
Where contamination risks are identified, targeted sampling and laboratory analysis can determine whether further assessment or remediation is required.
The final scope may be influenced by planning conditions, environmental-health comments and the proposed use of the site.
Mining and Ground Stability
Coal Mining and Ground-Risk Assessments
Historic mining, made ground, natural cavities and unstable soils can influence foundation design and development feasibility.
Coal Mining Reports
Review of available mining records and potential historical mining constraints.
Mining Risk Assessments
Assessment of whether mining features may present a risk to the proposed development.
Ground Stability Reviews
Consideration of shrinkable soils, made ground, cavities and other stability concerns.
Radon Assessments
Review of radon potential where relevant to the site and proposed construction.
Supporting Structural and Foundation Design
Ground investigation findings help structural engineers select suitable foundation forms and design parameters for the building.
The report may provide recommendations regarding bearing conditions, founding depth, groundwater, shrinkable soils, made ground and other relevant construction risks.
Final foundation design remains the responsibility of the appointed structural engineer and should reflect the building loads and investigation findings.
Typical London Projects
When Is a Site Investigation Required?
Our Site Investigation Process
We coordinate the investigation from the first enquiry through to the completed report and recommendations.
Send us the site details and development drawings.
Existing information and investigation objectives are reviewed.
A suitable investigation scope and quotation are prepared.
Access, services and site logistics are coordinated.
Fieldwork and sampling are completed.
Samples are submitted for relevant laboratory testing.
The final report and recommendations are issued.
1
Initial Review
Review the development, site history and available planning or technical information.
2
Investigation Scope
Confirm the required desktop study, fieldwork, sampling and laboratory analysis.
3
Site Fieldwork
Complete boreholes, trial pits or other agreed intrusive investigation methods.
4
Testing and Analysis
Assess field data and complete the required geotechnical or contamination testing.
5
Report and Recommendations
Issue clear findings for planning, structural design, Building Control and warranty purposes.
Why Choose One Stop Consult?
One Stop Consult coordinates the investigation process through a nationwide network of experienced geotechnical and environmental specialists.
Clients receive one point of contact for quotations, fieldwork coordination, reports and relevant follow-up queries.
Experienced geotechnical specialists
Fast project-specific quotations
Competitive pricing
Phase 1 and Phase 2 services
Planning and Building Control support
Residential and commercial experience
Dedicated project coordination
London and nationwide coverage
Information Required for a Quotation
Provide the full London site address, proposed development, approximate site area and current project stage.
Please upload the latest site plan, proposed layouts, planning conditions, historical reports and any structural, environmental or warranty-provider requirements.
Site-access restrictions, known services, demolition and the proposed investigation programme should also be identified.
Related London Services
Other Services Your Project May Require
Important Site Investigation Information
The investigation scope and conclusions depend on the project, available records, site access, exploratory locations and samples obtained. Ground conditions can vary between investigation points, and concealed risks may not be identified where areas cannot be accessed or sampled.
Final foundation and structural design remains the responsibility of the appointed engineer. Additional investigation, monitoring or remediation may be recommended following the initial findings. One Stop Consult provides consultancy and coordination support through experienced geotechnical and environmental specialists.
Frequently Asked Questions
Geotechnical Site Investigation London FAQs
What is a geotechnical site investigation?
It assesses the ground beneath a site to identify soil, groundwater, contamination and stability conditions that may affect development.
What is the difference between Phase 1 and Phase 2?
Phase 1 is a desktop review of available records. Phase 2 involves intrusive fieldwork such as boreholes, trial pits and laboratory testing.
Do I always need boreholes?
No. The required investigation method depends on the site, development and risks identified during the initial review.
Can you arrange contamination testing?
Yes. Soil sampling and laboratory testing can be arranged where contamination risks have been identified.
Do you provide coal mining reports?
Yes. Coal mining reports and mining-risk assessments can be arranged where relevant to the site.
Can the report help with foundation design?
Yes. The findings provide ground data and recommendations for consideration by the appointed structural engineer.
Is a site investigation needed for an extension?
It may be required where ground conditions are uncertain, significant loads are proposed or Building Control, engineers or warranty providers request further evidence.
Do you cover all of London?
Yes. We coordinate site investigations throughout London, Greater London and surrounding areas.
What information is needed for a quotation?
Provide the address, proposed development, site plan, planning conditions, previous reports and known access or service constraints.
Request Your Free Geotechnical Site Investigation Quote
Complete the form below with the London site address, proposed development and current project stage. Upload the latest site plans, planning conditions and any previous ground or contamination reports so our team can review the requirement and coordinate an appropriate quotation.