Concrete Scanning and GPR Utility Locating: Industry Overview
Ground penetrating radar has become the standard technology for non-destructive subsurface investigation in construction. Unlike traditional X-ray methods that require area evacuation and radiation safety protocols, GPR scanning allows real-time detection of embedded objects while work continues on surrounding areas.
What GPR Concrete Scanning Detects
| Target | Detection Depth | Typical Accuracy |
|---|---|---|
| Rebar and wire mesh | Up to 18 inches | ±0.5 inches |
| Post-tension cables | Up to 24 inches | ±1 inch |
| Electrical conduits | Up to 18 inches | ±0.5 inches |
| PVC and metallic pipes | Up to 16 inches | ±1 inch |
| Voids and delamination | Up to 20 inches | Variable |
Market Landscape
The utility locator market was valued at approximately $970 million in 2025, with GPR technology commanding a growing share projected to reach 38% by 2030. The industry spans from large national operators like GPRS — with 800+ technicians across every major U.S. market — to regional specialists who combine scanning with concrete cutting and coring services.
Key Selection Criteria for Contractors
- Equipment and Technology
- Leading firms use antenna arrays from GSSI, Hilti, Proceq, and ImpulseRadar. Multi-channel systems enable faster scanning of large slab areas, while handheld units suit confined spaces and wall scanning.
- Certifications and Training
- Look for technicians with CGA (Common Ground Alliance) compliance, OSHA certifications, and manufacturer-specific training. GPRS, for example, reports 99.8%+ accuracy rates through standardized training protocols.
- Deliverable Format
- Modern providers deliver digital scan reports with CAD-compatible markups, 3D models, and photographic documentation — not just spray-painted marks on the slab.
When to Engage a GPR Scanning Company
Core drilling, saw cutting, and any concrete penetration on post-tensioned structures should be preceded by GPR scanning. Severing a post-tension cable can cause catastrophic structural failure and carries liability exposure that far exceeds scanning costs, which typically range from $500–$2,500 per mobilization depending on scope.