AMS and Trimble Siteworks: excavation accuracy and volume insights for engineers
Reviewed by Joe Ashwell

First reported on The Construction Index
30 Second Briefing
AMS Contracting is using Trimble Siteworks Machine Guidance, supplied and installed by Sitech UK & Ireland on a LiuGong 913FCR excavator, to build an attenuation pond for a sports pitch in Redhill with centimetre-level excavation accuracy. A handheld GNSS receiver and tablet capture existing ground levels to create a digital terrain model, which is then displayed in the cab to show real-time bucket position against design. The system lets AMS calculate cut-and-fill volumes, assess material re-use and reprice work more accurately, replacing slower 2D laser-based level checks.
Technical Brief
- Trimble Siteworks hardware was retrofitted by Sitech onto a LiuGong 913FCR excavator, including full machine wiring.
- The GNSS receiver and tablet used for surveying are the same units docked onto the excavator.
- Switching from 2D laser guidance removed the need to continually move and re-establish laser benchmarks as grades changed.
- Having identical design data in both survey kit and cab display reduces discrepancies between setting-out and excavation control.
Our Take
Trimble’s push to consolidate connectivity and positioning in the MP1087 (10 November 2026) suggests that AMS Contracting’s centimetre‑level control on a single LiuGong 913FCR is likely an early step towards fully networked UK fleets rather than a one‑off deployment.
Sitech UK & Ireland’s recent move into the Scottish Plant Owners Association (27 October 2026) signals that contractors like AMS in Redhill will increasingly find machine control support embedded in regional plant‑hire and contractor networks, lowering adoption barriers for similar precision requirements.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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