HPI has undertaken contracts with companies including:

• Amec
• AVTechnology
• Balfour Beatty rail
• Cadbury
• Chicago Bridge and Iron (CB&I)
• Colas Rail
• Corus UK
• Courtland Fibron
• Hanson Marine
• Haven Marine Services Limited
• Inbev brewery
• LNG Avonmouth
• MoD
• National Grid
• Seabank Power
• Shell Oil UK
• Star Energy
• Svitzer Marine
• Tarmac Marine