GPR Survey Meaning, GPR Survey Explained.
What is a GPR Survey? | Cadmap Limited
At Cadmap Limited, we specialise in delivering high-quality underground utility surveys, and one of the most powerful tools we use is Ground Penetrating Radar (GPR). But what exactly is a GPR survey, and why is it essential for your construction or development project?
Understanding GPR Surveys
Ground Penetrating Radar (GPR) is a non-invasive geophysical method that uses radar pulses to image the subsurface. It allows surveyors to detect and map objects, changes in material, voids, and cracks beneath the ground – all without any digging or drilling.
In simple terms, a GPR survey helps you "see" what's underground before any construction begins.
How Does GPR Work?
GPR equipment sends high-frequency radio waves into the ground. When these waves hit a buried object or a change in material (like soil to concrete), they bounce back to the surface. These reflections are captured by the system and processed into visual data, which trained surveyors can interpret.
The result is a detailed view of subsurface features, typically up to 2–3 metres deep, depending on soil conditions and the frequency used.
What Can GPR Detect?
At Cadmap Limited, we use GPR surveys to detect a wide range of underground features, including:
Utilities: Pipes, cables, and ductwork (even non-metallic ones like plastic and concrete)
Void detection: Sinkholes, subsurface voids or areas of loose material
Reinforcement: Rebar and mesh within concrete slabs
Foundations: Old footings or previously unknown structural elements
Buried tanks or storage units
Why Choose GPR Surveys?
✅ Non-destructive: No need for excavation, reducing risk and disruption
✅ Accurate mapping: Enhances the safety and efficiency of construction projects
✅ Detects non-metallic objects: Unlike traditional cable detectors
✅ Cost-effective: Helps avoid costly delays and utility strikes
When Should You Use a GPR Survey?
GPR surveys are invaluable during the planning stages of construction, renovation, demolition, or utility installation. If your project involves digging, drilling, or altering the subsurface in any way, a GPR survey could save time, money, and safety concerns.
Why Choose Cadmap Limited?
At Cadmap Limited, we combine expert knowledge with advanced GPR technology to deliver accurate, reliable subsurface data. Our team is fully trained and experienced in interpreting GPR results and integrating them into clear, actionable reports – giving you confidence before you break ground.
Need a GPR Survey?
Contact Cadmap Limited today to speak to one of our survey specialists. Whether you're planning a small development or a major infrastructure project, we’re here to help you uncover what lies beneath.
