Upper Quartile

Upper Quartile is a specialist consultancy brand operating within Tetra Tech's UK and Europe business. It provides strategic advisory, project and cost management, and technical consultancy services to public and private sector clients across complex, regulated environments. The brand sits alongside other Tetra Tech Europe specialist consultancies such as Hoare Lea, NDY, Coffey Geotechnics, Carron + Walsh, and Tetra Tech International Development. Tetra Tech Europe describes itself as a leading technical, engineering, and environmental consultancy with more than 6,000 employees across the UK, Ireland, and the Netherlands. Its teams deliver multidisciplinary solutions in water, environment, sustainable infrastructure, power and energy, defence, and international development. Upper Quartile contributes to this portfolio through advisory and management consultancy capabilities, helping clients reduce risk, accelerate delivery, and unlock value. The Upper Quartile brand is part of Tetra Tech, Inc., a global provider of consulting and engineering services headquartered in the United States and listed on NASDAQ under the ticker TTEK. Tetra Tech's European operations trace a collective history of more than 160 years through predecessor firms and acquisitions. Upper Quartile operates primarily in the UK market, serving clients in sectors including property, water, energy, transport, buildings and infrastructure, defence, and government. As a sub-brand within a larger corporate group, Upper Quartile benefits from Tetra Tech's global resources and multidisciplinary expertise while maintaining a specialist, client-focused identity. Its services align with Tetra Tech Europe's cross-cutting capabilities, including asset management, engineering, environment, ground engineering, health and safety compliance, planning, project and cost management, and strategic advisory.

Upper Quartile operates as a specialist consultancy brand within Tetra Tech's UK and Europe operations. Tetra Tech Europe describes a collective history of more than 160 years in the region, built through a family of specialist businesses including Hoare Lea, NDY, Coffey Geotechnics, Carron + Walsh, and Tetra Tech International Development. Upper Quartile forms part of this multidisciplinary group, contributing advisory, project and cost management, and technical consultancy capabilities. The brand's public presence is primarily through the Tetra Tech Europe website and the legacy WYG domain (wyg.com), reflecting its integration into Tetra Tech following Tetra Tech's acquisition of WYG in 2019. WYG was a major UK-based multidisciplinary consultancy, and its absorption into Tetra Tech brought a range of specialist advisory and management services into the global group. Upper Quartile emerged as a distinct consultancy identity within this structure, serving clients across property, water, energy, transport, buildings and infrastructure, defence, and government sectors. Tetra Tech, Inc., the ultimate parent, is a NASDAQ-listed global provider of consulting and engineering services. Its European business employs more than 6,000 people across the UK, Ireland, and the Netherlands, working from more than 50 locations. Upper Quartile benefits from this scale while maintaining a specialist focus on strategic advisory and project and cost management. The brand's work aligns with Tetra Tech's mission to deliver sustainable and resilient solutions, often in complex or highly regulated environments.

• Tetra Tech acquires WYG, integrating its UK consultancy operations into the global group.

• Upper Quartile operates as a specialist consultancy brand within Tetra Tech Europe.

Specialist consultancy within Tetra Tech Europe, combining global expertise with regional insight to deliver sustainable and resilient solutions.

• Strategic Advisory

  Advisory services helping clients navigate complex regulatory and operational environments.

• Project and Cost Management

  Specialist project and cost management consultancy for public and private sector clients.

1. 1Europe - Tetra Techtetratech.com
2. 2About Us - Tetra Techtetratech.com
3. 3Services - Tetra Techtetratech.com
4. 4Work With Us - Tetra Techtetratech.com
5. 5Wikidata Q132472605wikidata.org