D.G.Biddle & Associates Limited was formed in 1973 by Devon G. Biddle, and incorporated in 1974 to provide Consulting Engineering Services, principally in Civil Engineering. The company grew from an initial group of 3 employees to what it is today.

Currently, the firm offers Consulting Engineering and Planning services principally in the land development industry, with a complement of approximately 45 employees. The firm has extensive experience in all aspects of residential subdivision design which entails land use planning, municipal servicing, hydrology and design of hydraulic structures, flood plain and water resource management, as well as housing grading details. Our services extend from preliminary design to assumption of municipal services, including initial municipal contact, site design, construction administration and inspections.

In addition to subdivision work, the company is also involved in site design for residential, industrial or commercial projects.

In the area of land use planning, we prepare subdivision and site plan designs, zoning by-law amendments, official plan amendment and site plan approval applications for projects. These are presented to planning and political bodies in the normal course pursuant to the Planning Act.

Greater Oshawa Chamber of Commerce Business of the Month

D.G. Biddle & Associates Ltd. was honoured to be named Business of the Month by the Greater Oshawa Chamber of Commerce for involvement with Habitat for Humanity, Oshawa-Parkwood Rotary and other community projects.


Michael Carswell B.Eng., P.Eng.
Senior Project Engineer

Robbie Larocque B.A.Sc., P.Eng.
Water Resources Manager

David Biddle B.E.Sc., P.Eng.
Structural Design Engineer
Vice President

Michael Fry B.A.A., M.C.I.P., R.P.P.
Planning Manager

Geoff Osborne P.Eng., MBA, LEED AP
Mechanical & Electrical Engineer

Fred Vierhout Project Coordinator

Brett Lewandowsky B.Eng, P.Eng
Project Construction Engineer

Company Affiliation & Memberships

  • Professional Engineers Ontario

  • Association of Consulting Engineering Companies

  • Illuminating Engineering Society of North America

  • Canada Green Building Council

  • Consulting Engineers of Ontario

  • American Society of Heating, Refrigerating & Air-Conditioning Engineers

  • Ontario Professional Planner Institute

  • Canadian Institute of Planners