Geotechnical and geoenvironmental ground investigation specialists

We deliver high quality and cost-effective ground investigation solutions

Established in 1964, Structural Soils (SSL) is an award-winning, multidisciplinary ground investigation company. Built on technical excellence, experience and innovation, we have the capability and capacity to undertake contracts of any size and scope across the UK and internationally.  Our clients know they can trust us to provide a reliable and collaborative service that delivers a safe and high quality ground investigation.

Our services

Structural Soils works with a large number of clients from many different industries and sectors. Each client, from large multinational companies to private individuals, and every project, will require a unique approach. That’s why we provide bespoke solutions for all our projects regardless of size. Our extensive range of in-house services is designed to provide a complete package for each client.

An award-winning ground investigation company

Structural Soils has won multiple industry awards. In 2024, we were shortlisted for four nominations: UK Geotechnical Team of the Year, Ground Investigation Specialist of the Year, Ground Investigation Project of the Year and Excellence in Outreach.

Why clients choose Structural Soils

We offer high quality and safe ground investigation services adding real value to the construction industry and the community. We pride ourselves on our quality of services and strong client relationships nurtured over the years. Clients choose SSL for our collaborative and safe approach that reliably delivers results. Our core values underpin our culture and what clients can expect when they work with us.

Why choose Structural Soils - Experience and expertise

Experience and expertise

We have an extensive portfolio of detailed and complex ground investigations across the UK and overseas. More than 100 staff members hold geological, engineering or science-based degrees, and over 30 staff have more than 20 years’ industry experience. We train and support staff to become the next generation of ground investigation experts.

Why choose Structural Soils - Capability


We aim to provide maximum self-delivery with minimal reliance on subcontractors, which gives greater control of health and safety, quality, competency, resources, lead-in times, programme, deliverables and cost.  We rise to challenges and constantly advance our services to meet client needs. We have 33 multidisciplinary drilling rigs, four UKAS-accredited laboratories and 250 staff nationally.

Why choose Structural Soils - Flexibility


We work in any environment or location, including city centre, rural, brownfield, over water, road and rail in the UK and internationally.

Why choose Structural Soils - Collaboration


We promote a non-confrontational culture, preferring to form partnerships with clients, stakeholders and suppliers. Our tender price almost invariably translates to the final contract cost. We work together with clients and suppliers to deliver value for money and honour commitments.

Why choose Structural Soils - Multipurpose services

Multipurpose and integrated services

In addition to Structural Soils’ extensive in-house capabilities, we offer supplementary ground investigation specialities such as geophysics, chemical testing, archaeological and ecological services provided by sister companies within the RSK Group. We combine these services to create a bespoke solution for each project.

Structural Soils - why work with us - Sustainability


Structural Soils recognises our responsibilities in relation to our sustainability and social value and we strive to achieve positive change. SSL has signed up for RSK’s 2030 sustainability strategy Second Nature. Our environmental, social and governance (ESG) objectives provide annual targets against which our performance is measured.

Latest projects

A premier UK ground-investigation contractor

Our continuing growth and success is accomplished through our reputation, competitive rates and quick response. Since becoming an RSK company in 2007, we have been offering other group services, including archaeology, ecology, geophysics and chemical testing, as part of a comprehensive ground investigation service.

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Structural Soils is part of the RSK group of companies

The RSK group is a leading integrated environmental, engineering and technical services business offering bespoke end-to-end solutions to a variety of sectors. Headquartered in the UK but with an established presence throughout Europe, Africa, the Middle East, Asia and Australia, RSK helps organisations around the world achieve their business aspirations in a sustainable and efficient manner.