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 a peak of 45 people offering civil, structural and planning services, as well as providing advice in other land development related services.

Currently, the firm offers Prime Consulting Engineering and Planning Services principally in the land development industry, with a complement of approximately 45 employees.  In the course of this work, we engage as associates or sub-consultants, the services of Land Surveyors, Geotechnical, Electrical and Mechanical Engineers, Architects, Landscape Architects, Environmental Planners and other diciplines as required for the various needs for projects.  Conversely, our services are reciprocally provided to these consultants for specialized Civil, Structural and Planning services.

The firm has extensive experience in all aspects of residential subdivision design which entails planning, planning applications, regular municipal services, hydrology and design of hydraulic structures, flood plain and water resource management, as well as housing grading details and problems.  From the design and municipal liaison in preparation of subdivision agreements, our services extend to supervision of construction and administration of construction contracts and the subdivision agreements to the time of assumption of the works by the municipality.

In addition to subdivision work, the company is also involved in specific site design for multiple residential, industrial or commercial projects, both as principal consultant, as well as the civil engineering and/or planning aspects only.

In the planning area, we prepare subdivision and site plan designs, zoning, official plan amendment and site plan approval applications for specific projects.  These are presented to planning and political bodies in the normal course pursuant to the Planning Act proceedures.

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.
Municipal Design 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 Senior Planner

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

Fred Vierhout Project Co-ordinator

Brett J. 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