Part of Phenna Group
GSTL provides specialist laboratory and on-site testing for soils, rock, aggregates and concrete, supporting construction, civil engineering, government and domestic projects across the UK and internationally.
As part of Phenna Group, we continue to deliver the flexible, client-focused service, fast turnaround and clear reporting associated with GSTL, supported by the resources and technical reach of a global testing, inspection, certification and compliance network.
Phenna Group operates through five specialist divisions: Infrastructure, Built Environment, Industrials, Food & Life Sciences, and Certification & Compliance.
Wider support for ground and construction challenges
Geotechnical and construction projects often require more than one form of technical input. Laboratory results and in-situ testing may need to be considered alongside ground investigation, engineering design, environmental assessment, materials testing or ongoing monitoring.
Through Phenna Group, GSTL can help customers access complementary expertise when a requirement extends beyond our own testing services. Customers retain the direct support of the GSTL team while gaining a route to additional specialists from across the wider network.
Investment in people, facilities and methods
Phenna Group invests in its businesses for the long term, helping them develop their people, equipment, facilities, technology and technical capabilities.
For GSTL, this supports the continued development of our laboratory, field-testing services and reporting systems. It strengthens our ability to apply current testing methods, respond to unusual requirements and provide dependable evidence for project decisions.
Technical collaboration without losing local service
Every Phenna Group company brings established experience in its own field. When projects require several disciplines, businesses can share knowledge and collaborate to provide a more connected response.
GSTL contributes geotechnical laboratory testing, site testing, drilling, sampling and coring expertise. Our customers can also benefit from wider infrastructure, environmental, structural, inspection and compliance capabilities whenever these are relevant to their work.
The same responsive GSTL relationship
Being part of an international Group does not change the way GSTL works with its customers. Our teams remain focused on responsive communication, practical testing solutions and reports that clearly present the information customers need.
What changes is the breadth of support available around that relationship, giving customers access to wider expertise without losing the flexible, personal service they value.
Capability across regions and project types
From our laboratory in Llanelli, South West Wales, GSTL supports customers across the UK and internationally, with nationwide field services and sample collection helping make specialist testing accessible.
Through Phenna Group's presence across the UK & Ireland, EMEA, the Americas and Asia-Pacific, we can also help connect customers with trusted businesses that understand local standards, conditions and regulatory requirements.
This gives projects access to broader testing, inspection, certification and compliance expertise when additional or region-specific support is needed.
Discuss your testing requirements
Whether you need laboratory analysis, in-situ testing, drilling, concrete sampling, coring or complementary support from elsewhere in Phenna Group, our team can help identify an appropriate route forward.
We will consider your site conditions, project programme and reporting requirements before recommending the most suitable GSTL service or connecting you with a relevant specialist from across the wider network.