- A.J. Balfour & Associates
 - Consulting civil and structurl engineers. - Alder Communications Ltd.
- Specialises in servicing the requirements of the mobile telecommunication industry in Scotland and the North of England.
- Alfred McAlpine Civil Engineering (2)
- Babtie Group
- Consultancy on design and construction.
- Buro Happold
- Cappagh Group
- Services include civil engineering, recycling, demolition, and skip and aggregate supply throughout the South of England.
- Halcrow Group
- Independent provider of infrastructure-based business solutions, consultancy, and services.
- John Laing plc@
- John Mowlem and Company plc@
- Murray Rix
- Civil & geotechnical engineers.
- North Midland Construction
- Civil engineering and construction firm whose contracts includes drainage, substation construction, and cable laying works.
- Ritchie Brothers (PWC) Ltd
- Specialising in petro-chemical and airfield environments. Bridge and road construction including public service installation.
- Roadwatch UK
- Provides solutions in asset management, condition surveying, trend analysis, and quality and safety programmes.
- Thomas Telford Services Ltd
- Commercial arm of The Institution of Civil Engineers. Recruitment, training, publications, and conferences.
- WSP Group (1)
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