Services
3D Underground Mapping & GPR Surveys
High-accuracy 3D capture of subsurface and surface infrastructure.
Need a PAS 128 Compliant GPR Survey?
Understanding what lies beneath the surface is critical for safe construction. Trenchix provides Tier 1 underground utilities mapping , combining GPR (Ground Penetrating Radar) and Electromagnetic Location (EML) to create precise 3D mapping of your site’s subsurface.
Traditional 2D plans are often outdated or inaccurate. Our 3D solutions verify the exact position and depth of all buried assets—Gas, Electric, Water, and Telecoms—delivering a digital twin that integrates seamlessly into your BIM (Building Information Modelling) workflow.
What is an Environmental Risk Assessment?
We are proud to introduce our latest cutting-edge service: 3D Mapping for Drain Sewers and Water Infrastructure. Leveraging advanced technology and innovative techniques, this service enables comprehensive, accurate, and efficient mapping of underground systems to support both maintenance and future planning needs.
We use state-of-the-art detection technology to locate targets that standard surveys miss.
What you get
- PAS 128 quality-level classification
- Layered DWG / GIS deliverables
- Georeferenced survey data
- Combined utility and topographical plans
- Designer-ready handover
Why Trenchix
Delivered with certainty
PAS 128 rigour
Survey methodology aligned to PAS 128, giving quality levels you can present to designers and clients.
CAD & GIS deliverables
Clean, layered deliverables that drop straight into your design environment.
Reduced strike risk
Know what is beneath the site before excavation — protect people, programme and budget.
How it works
From enquiry to evidence
Desk study
We review statutory records, existing drawings and site constraints to plan the most efficient survey methodology.
Site capture
EML, GPR and topographical instruments capture the site in one coordinated mobilisation, minimising disruption.
Process & verify
Data is processed, quality-levelled to PAS 128 and verified against records, with intrusive verification where required.
CAD delivery
Layered, georeferenced DWG and GIS deliverables are issued, ready to drop straight into your design environment.
Who it’s for
Built for commercial decision-makers
Designers & engineers
PAS 128 quality levels and CAD/GIS deliverables ready for design environments.
Main Contractors
Strike-risk reduction before excavation on live commercial programmes.
Local authorities
Utility and topographical data for highways and public realm schemes.
Why contractors trust Trenchix
FAQs
Frequently asked questions
What is PAS 128 and why does it matter?
PAS 128 is the UK specification for underground utility detection and verification. It assigns quality levels to every located utility, so designers know exactly how much confidence to place in the data — reducing redesign and strike risk.
What formats do you deliver in?
Layered AutoCAD DWG as standard, plus PDF and GIS-ready formats on request. Deliverables are georeferenced and drop straight into your design environment.
What accuracy can we expect?
Topographical surveys are delivered to survey-grade accuracy using total stations and GNSS. Utility mapping accuracy is stated per PAS 128 quality level, with intrusive verification available where certainty is critical.
Do you combine utility and topographical surveys?
Yes — combining both in one mobilisation is usually the most cost-effective approach and gives your designers a single, coordinated deliverable.
Can you work overnight or under possession?
Yes. Night working, weekend programmes and rail possessions are routine for our mapping teams where live operations require it.
Do you provide as-built updates after construction?
We can return to capture as-built utility positions post-construction so your records stay accurate for future works and maintenance.
Get In Touch
Ready to discuss your project?
From major infrastructure surveys to emergency commercial drainage callouts — our teams are available 24/7.