Hygienic and Environmental Engineering Services

HEES is a specialist mechanical and electrical contractor, based near London, with experience in the installation of MEP projects including high purity water cGMP process systems, clean utilities and industrial sectors.

We carry out all project installations in accordance with the latest comprehensive Quality Assurance Systems, comply with all relevant legislation, protocols and standards and are accredited with various standards bodies.

Mechanical Services

We provide high purity pipework systems for pharmaceutical research, clinical trials and cGMP manufacturing.

We design, install, commission and qualify:

  • Water for injection (WFI) storage & distribution systems
  • Purified Water (PW) storage & distribution systems
  • Pure Steam
  • Demineralised water
  • Product process lines
  • Specialist medical gases

Electrical Services

We offer the electrical expertise to provide complete renewal, refurbishment or modification to clients’ electrical services.

Our electrical services include:

  • Design & installation
  • Electrical mains power distribution
  • Process power systems
  • Electrical Controls & Instrumentation (EC&I)
  • Data communication systems
  • IEE regulations & NICEIC compliant testing
  • ATEX compliant installation and certification


Biopharm site design and installation


The high purity pipework systems we design and install are used in R&D applications, clinical trials and manufacturing. Systems are fully compliant with all bioprocessing equipment ASME BPE B31.3 standards.

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specialist industrial installations


We create and install specialist systems for various industries including, Food & Beverage, Chemical and Personal care. We also provide a range of supporting electrical services.

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High end Automotive electrical installations


We have been installing electrical services for car showrooms and workshops, both refurbishments and new builds, for many years. We work with lighting designers to provide the perfect solution.

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We have been a client of HEES for a number of years and they have always been a helpful and efficient contractor on a variety of projects. They have consistently demonstrated flexibility and understanding to the client’s needs and delivered repeatedly.

Mark Pomfret, Engineering Director

Having worked with HEES on a mixture of both large and small projects, over a number of years, HEES have proven to be a professional company, providing a reliable and beneficial service to Austin’s, and due to that continued service, HEES have been added to the Austin Trusted Suppliers list.

George Lowney, Project Director

HEES Projects

GW Pharmaceuticals process engineering

GW Pharmaceuticals

HEES have been contracted to complete mechanical and electrical services for the new expansion facility at GW Pharma.

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Blood Fractionation

Blood Fractionation

HEES have successfully completed a blood fractionation project for BPL Therapeutics in Elstree, United Kingdom.

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Mammalian Cell Culture Installation

Mammalian Cell Culture

HEES have successfully completed the Process pipework contract for a new £30 million Mammalian Cell Culture Facility.

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Latest news

New office phone number

HEES logo

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HEES awarded new contract for WFI

New WFI contract for HEES

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Additional accreditation for HEES

British Compressed Gas Association header

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Ferrari Showroom in Central London

Lighting installation in Ferrari showroom

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