Our Concrete Scanning, GPR
and NDT Services.
Concrete scanning before coring or cutting, PAS 128 utility surveys, post-tension detection, void detection, pile integrity testing and structural investigation — delivered by an experienced specialist and reported clearly.
Every survey is carried out on site by an experienced specialist and backed by a clear, practical report.
Concrete Scanning & GPR Surveys
GPR & 3D Scanning
Ground-penetrating radar surveys to locate rebar, post-tension cables, conduits and voids before coring, cutting or drilling. We use the Proceq GP8000 and GS8000 GPR systems to deliver 2D profiles and full 3D concrete scanning with millimetre-accurate depth data — essential for safe, compliant work on reinforced concrete structures. ## 3D Concrete Scanning Our 3D concrete scanning service uses the Proceq GS8000 to capture a dense grid of GPR profiles across the survey area. The data is processed into a 3D visualisation showing the precise location and depth of every embedded feature — rebar, post-tension cables, conduits and voids — in a single, easy-to-read output. This is particularly valuable on complex slabs, transfer structures and post-tensioned decks where a 2D profile alone may not give sufficient clarity. ## Concrete Scanning Before Drilling, Coring and Cutting Drilling or coring into reinforced concrete without scanning first risks striking rebar, severing post-tension cables or cutting through live services. A severed post-tension tendon can cause sudden, catastrophic slab failure. We carry out pre-coring and pre-drilling GPR scans to mark safe locations on the slab surface, giving your team the confidence to proceed safely. Scans are typically completed on the same day and results are marked directly on the concrete.
- Rebar detection & mapping
- Post-tension cable location
- 3D concrete scanning (Proceq GS8000)
- 2D GPR profiling (Proceq GP8000)
- Conduit & service location
- Void detection in slabs
- Pre-coring & pre-drilling clearance
Void Detection & Subsurface Scanning
Subsurface Scanning
GPR surveys to detect voids, washouts and poor compaction beneath concrete slabs, tarmac and paved surfaces. Early detection prevents costly structural failure and safety incidents — particularly important for highways, car parks, warehouses and industrial floors. ## How GPR Detects Voids Beneath Slabs Ground-penetrating radar transmits a pulse of electromagnetic energy into the ground and records the reflections from subsurface features. A void — whether caused by water erosion, poor compaction or ground movement — produces a strong, characteristic reflection that is clearly distinguishable from solid material. We scan in a grid pattern across the survey area to build a complete picture of subsurface conditions, identifying the location, approximate depth and lateral extent of any voids present. ## When to Commission a Void Detection Survey Void detection surveys are most commonly commissioned when floor slabs show signs of movement, cracking or deflection; before major plant or racking installations on industrial floors; as part of pre-purchase due diligence on commercial or industrial property; following nearby excavation or groundworks; and on highways or car park decks where surface defects suggest underlying loss of support.
- Void detection beneath slabs
- Washout & sinkhole risk assessment
- Poor compaction identification
- Highways & car park surveys
- Industrial floor assessments
- Pre-development ground surveys
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PAS 128 Utility Surveys
PAS 128 Utility Surveys
PAS 128 compliant underground utility surveys combining electromagnetic locating and GPR to map buried services before excavation, groundworks or borehole installation. We deliver Quality Levels B, C and D — from desktop records to full detection and verification surveys — providing the evidence needed for safe excavation and infrastructure planning. ## What is PAS 128? PAS 128 is the British Standard for underground utility detection, verification and location. It defines four Quality Levels (D, C, B and A) that describe the increasing rigour of the investigation — from desktop records review (D) through to intrusive verification (A). Most pre-excavation surveys are commissioned to Quality Level B, which combines electromagnetic locating and GPR to detect and map buried services. We deliver Quality Levels B, C and D and can advise on the appropriate level for your project. ## Utility Surveys Before Excavation and Groundworks Striking a buried utility during excavation can cause serious injury, project delays and significant cost. A PAS 128 utility survey identifies the location and depth of gas mains, water mains, electricity cables, telecoms ducts and drainage runs before any ground is broken. We produce CAD drawings showing the detected services overlaid on a site plan, giving your team a clear picture of what lies beneath.
- Quality Level B detection surveys
- Quality Level C & D records
- Electromagnetic locating
- GPR utility mapping
- Borehole & excavation clearance
- CAD utility drawings
Pile Integrity Testing
Foundation NDT
Low-strain pulse echo pile integrity testing to identify necking, voids, cracks and defects in foundation piles without excavation. Suitable for bored, driven and CFA piles — providing confidence in foundation quality before construction progresses. ## How Low-Strain Pile Integrity Testing Works A small impact is applied to the pile head using an instrumented hammer. The resulting stress wave travels down the pile and is reflected back by any changes in cross-section, material quality or the pile toe. A sensor on the pile head records the reflected wave, and the data is analysed to identify the location and nature of any anomalies. The test is non-destructive, requires no excavation and can be completed quickly — typically 10–30 piles per day depending on access and pile type. ## When is Pile Integrity Testing Required? Pile integrity testing is most commonly specified as part of a quality assurance programme on new piling works, when visual inspection of the pile head reveals signs of defects, when settlement or movement is observed after piling is complete, and when existing piles are being incorporated into a new structure and their condition is unknown.
- Low-strain pulse echo testing
- Necking & void detection
- Crack & defect identification
- Bored, driven & CFA piles
- Pre-construction verification
- Integrity reports for engineers
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UPV Surveys
Concrete Quality NDT
Ultrasonic pulse velocity (UPV) surveys to assess concrete quality, uniformity and the presence of cracking, honeycombing or voids — without damage to the structure. Used for condition assessments, dispute resolution and quality control on new and existing concrete. ## How UPV Testing Works An ultrasonic pulse is transmitted through the concrete between two transducers. The time taken for the pulse to travel through the material is measured and used to calculate the pulse velocity. High-quality, dense concrete transmits the pulse quickly; cracked, honeycombed or deteriorated concrete slows the pulse and reduces the velocity. By mapping pulse velocity across a structure, we can identify zones of poor quality, cracking or internal defects. ## Applications of UPV Testing UPV surveys are used to assess concrete quality on new construction where mix or placement issues are suspected; to map the extent of fire damage or freeze-thaw deterioration in existing structures; to identify honeycombing or voids in columns, walls and beams; and to provide supporting evidence in disputes about concrete quality or workmanship.
- Concrete quality assessment
- Crack & void detection
- Honeycombing identification
- Uniformity mapping
- New-build quality control
- Condition reports for disputes
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Corrosion Surveys
Corrosion Assessment
Half-cell potential mapping, carbonation testing and chloride profiling to assess reinforcement corrosion risk in concrete structures. Compliant with ASTM C876. Used for car parks, bridges, marine structures and any reinforced concrete showing signs of deterioration. ## Half-Cell Potential Mapping Half-cell potential mapping measures the electrochemical potential of the reinforcement through the concrete surface. Areas of active corrosion produce characteristic negative potentials that are clearly distinguishable from passive steel. We map the potential across the entire survey area to produce a corrosion risk plan showing zones of high, medium and low corrosion activity — giving engineers the data needed to prioritise repairs and plan remediation. ## Carbonation and Chloride Testing Carbonation reduces the alkalinity of concrete, removing the passive protection that normally prevents reinforcement corrosion. Chlorides — from de-icing salts, marine exposure or contaminated aggregates — accelerate corrosion once they reach the reinforcement. We carry out phenolphthalein carbonation depth testing and chloride profiling on core samples to establish the cause of corrosion and assess the remaining service life of the structure.
- Half-cell potential mapping
- Carbonation depth testing
- Chloride profiling
- ASTM C876 compliance
- Car park & bridge surveys
- Corrosion risk reports
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Structural Monitoring
IoT Monitoring
IoT-enabled structural monitoring using tiltmeters, crack sensors and remote data dashboards. We design, install and manage monitoring programmes for buildings affected by adjacent construction, tunnelling, subsidence or ongoing movement — providing real-time alerts and trend data. ## Crack and Movement Monitoring We install wireless crack sensors and tiltmeters directly onto the structure, calibrated to detect movement at sub-millimetre resolution. Data is transmitted continuously to a cloud dashboard accessible from any device. Threshold alerts notify you immediately if movement exceeds agreed trigger levels — giving you the earliest possible warning of significant change and the data to demonstrate compliance with construction monitoring requirements. ## Monitoring Programmes for Construction and Tunnelling Adjacent construction, piling, tunnelling and deep excavation all carry a risk of inducing movement in nearby structures. We design and install monitoring programmes to the requirements of pre-construction condition surveys, party wall agreements and construction management plans — providing the independent, auditable data that engineers, insurers and building owners need.
- IoT tiltmeter installation
- Crack sensor networks
- Remote data dashboards
- Real-time movement alerts
- Tunnelling & construction monitoring
- Long-term trend reporting
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Structural Investigation
Defect Investigation
Evidence-based structural investigations for cracking, subsidence, movement, water ingress and concrete deterioration. We combine visual inspection, NDT and intrusive investigation to produce clear reports for repair specification, insurance claims and dispute resolution. ## What a Structural Investigation Involves A structural investigation begins with a thorough visual survey of the affected area, recording the location, pattern and severity of defects. This is followed by targeted NDT — GPR, UPV, half-cell potential mapping or borescope inspection depending on the nature of the defect — to gather objective data on the condition of the structure below the surface. Where intrusive investigation is required, we can arrange core sampling, trial pits or drainage CCTV in conjunction with specialist subcontractors. ## Reports for Repairs, Insurance and Dispute Resolution Our investigation reports set out the findings clearly, explain the likely cause of the defects and recommend appropriate remediation. Reports are written to be understood by non-specialists as well as engineers — making them suitable for insurance claims, party wall disputes, building warranty claims and pre-purchase surveys. We can provide expert witness statements if required.
- Cracking & subsidence investigation
- Movement & settlement analysis
- Water ingress assessment
- Concrete deterioration surveys
- Insurance & legal reports
- Repair specification support
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Matterport Digital Twins
3D LiDAR Surveys
Matterport Pro3 LiDAR digital twin surveys creating navigable 3D building records with millimetre-accurate point cloud data. Used for remote measurement, condition documentation, asset management and heritage recording — accessible anywhere via browser. ## What is a Matterport Digital Twin? A Matterport digital twin is a fully navigable, photorealistic 3D model of a building or space, created using the Matterport Pro3 LiDAR scanner. It captures both the visual appearance and the precise geometry of the space — allowing users to navigate through the building virtually, take accurate measurements, annotate defects and share the model with anyone via a browser link. No specialist software is required to view or use the model. ## Applications in Structural Surveys and Asset Management Digital twins are increasingly used as a record of condition at a point in time — particularly valuable before and after construction works, for pre-purchase surveys, and for heritage and listed building recording. They allow remote measurement and inspection without repeated site visits, reduce the risk of disputes about pre-existing conditions, and provide a permanent, accessible record for asset management.
- Matterport Pro3 LiDAR scanning
- Navigable 3D building models
- Point cloud data export
- Remote measurement tools
- Heritage & listed building records
- Asset management documentation
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Crack & Subsidence Investigation
Subsidence Reports
Independent crack and subsidence investigations for homeowners, insurers and loss adjusters. We apply BRE Digest 251 crack categorisation, GPR, borescope and CCTV drainage surveys to establish cause, severity and appropriate remediation — producing clear expert reports. ## BRE Digest 251 Crack Categorisation BRE Digest 251 is the standard framework used in the UK to classify cracking in buildings by severity — from Category 0 (hairline, negligible) through to Category 5 (very severe, requiring major repair or partial rebuilding). We apply this classification system to every crack we record, giving homeowners, insurers and engineers a consistent, objective basis for assessing the significance of the damage and deciding on the appropriate response. ## Establishing the Cause of Subsidence and Cracking Cracking in buildings has many causes — differential settlement, tree root activity, drainage failure, thermal movement, overloading and structural defects among them. Identifying the true cause is essential before any remediation is specified. We use a combination of visual survey, GPR, borescope inspection and CCTV drainage surveys to gather the evidence needed to reach a reliable diagnosis — and we set out our findings clearly in a written report.
- BRE Digest 251 crack categorisation
- GPR & borescope surveys
- CCTV drainage investigation
- Cause & severity assessment
- Homeowner & insurer reports
- Loss adjuster support
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Trusted by engineers, contractors and insurers across the UK.
We work with structural engineers, main contractors, specialist subcontractors, property owners, insurers and loss adjusters — anyone who needs reliable NDT data and clear reporting to make informed decisions.
London-based. UK-wide reach.
Serving London, Kent, Essex and the South East, with UK-wide coverage.
Primary Coverage
- London (all boroughs)
- Kent
- Essex
- Surrey
- Sussex
- Hertfordshire
- Berkshire
- Hampshire
National Projects
- Midlands
- North West
- North East
- Yorkshire
- South West
- Wales
- Scotland
Ready to discuss your survey requirements?
Call or email to discuss your project. We respond quickly and can usually mobilise within 48 hours for London and the South East.
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