With two office locations, one in Waterloo and a satellite office located in Hamilton, the firm provides professional mechanical and electrical consulting engineering for architects and building owners.

Currently the firm employs over fifty staff dedicated to the provision of exceptional consulting engineering. Since the inception of DEI & Associates Inc. in 1999, our company has continually built on our reputation of providing exceptional client service, innovative, cost-effective, and practical engineering solutions specifically designed for each individual project, and unmatched design documentation.

We understand that the best systems are functional, energy efficient, and are cost-effective.  Our philosophy when designing building systems is to provide the best quality design and documentation, value engineered with a common sense approach to suit the building and occupancy.  Our service is to consult with and administer for the client professionally engineered systems from concept design to project completion.  Our commitment to each project is that the owners and occupants of the building will a facility built to our specifications and drawings with quality materials and workmanship, the proper environment for their facility, and an energy efficient system.

The President of the firm is Mr. Leon Demaiter, P.Eng.  Leon brings over 35 years of consulting experience in the building services industry with a broad range of experience, knowledge, and expertise in building services.  Since May of 2015, DEI & Associates Inc. has proudly announced the appointment of eight new Associates to the firm who have joined the Principal in ownership.  These Associates represent the future of the company and they are committed to the upholding and building upon the reputation DEI & Associates Inc. has built in the industry.

In April of 2015, DEI & Associates Inc. was excited to open a new division to expand our services, Aquatic Design and Engineering. This division is dedicated to providing aquatic design and contract administration services for the aquatic industry including pools, splash pads, and fountains.

Our company specializes in providing mechanical, electrical, and refrigeration engineering for the building service industry.  The firm completes both new and renovation projects in the educational, institutional, commercial, residential, recreational, and other building sectors.  We are committed to ensuring that each staff member is trained properly, experienced, knowledgeable, and prepared to provide professional consulting engineering services for any project.  Our design philosophy is to ensure our engineering team designs systems that are practical and energy efficient, designed to ensure that the occupants, building owners, and user groups have the best possible environment, maintain project budgets, and consider operational costs.

DEI & Associates Inc. works extensively to remain informed of technological advancements in our industry as a measure to bring additional value to our clients as well as remain competitive in the market.  In response to the shift within the sector from two-dimensional drafting to three dimensional modeling, our office has established a dedicated team to development of our capabilities within a Building Information Model.  Our office utilizes Revit on all BIM projects and has completed numerous of projects to a Level of Development 300 / 350.  Our team is continually expanding our capabilities, quality, and accuracy of models through both in-house training seminars, mentorship from outside consultants, and attendance at international seminars to learn industry best practices.

The company is licensed with the Professional Engineers of Ontario and the Consulting Engineers of Ontario.  Our office is licensed in numerous provinces across Canada and the staff maintains involvement as members of various industry associations including ASHRAE, NFPA, CaGBC, etc.

Memberships

DEI & Associates Inc. is a member of the following associations:
  • Consulting Engineers of Ontario
  • Professional Engineers of Ontario
  • Grand Valley Construction Association
  • American Society of Heating, Ventilation, and Air Conditioning Engineers
  • National Fire Protection Association
  • Canadian Fire Alarm Association
  • Building Industry Consulting Service International
In addition, DEI & Associates Inc. is also licensed to practice engineering and a member of the professional engineering association in the following provinces & territories:
  • Prince Edward Island
  • Nova Scotia
  • New Brunswick
  • Newfoundland and Labrador
  • Manitoba
  • Saskatchewan
  • Alberta
  • British Columbia
  • Yukon

DEI & Associates Inc. is centrally located in Southern Ontario with our head office located in Waterloo and a satellite office located in Hamilton.

Waterloo Office

55 Northland Road
Waterloo, ON N2V 1Y8

T: 519-725-3555
F: 519-725-2515
E: dei@deiassociates.ca

Hamilton Office

7 Innovation Drive, Unit 210
Dundas, ON L9H 7H9

T: 519-725-3555
F: 519-725-2515
E: dei@deiassociates.ca

DEI & Associates Inc. is centrally located in Southern Ontario with our head office located in Waterloo and a satellite office located in Hamilton.

Waterloo Office

55 Northland Road, Waterloo, ON N2V 1Y8
T: 519-725-3555 • F: 519-725-2515
E: dei@deiassociates.ca

Hamilton Office

7 Innovation Drive, Unit 210, Dundas, ON L9H 7H9
T: 519-725-3555 • F: 519-725-2515
E: dei@deiassociates.ca
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