Established in 1973 and incorporated in 1974, D.G. Biddle & Associates Limited provides consulting civil engineering and planning services in southern Ontario, mainly in the Durham Region. The company has a staff of approximately 45, including professionals, technicians, clerical, and field personnel providing civil, structural, mechanical, electrical engineering and planning services to both private and public clients.


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

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

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

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

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

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

Kurtis Keuning P. Eng
Municipal Project Engineer

Tim Rupert M. Eng., P. Eng
Structural Project Engineer


  • Management of approval processes for land development projects
  • Coordination of traffic, noise, and environmental studies
  • Quantity and cost estimating
  • Liaison with regulatory approval authorities
  • Construction management
  • Official Plan amendment and rezoning applications
  • Site Plan Control applications
  • Minor Variance applications
  • Consent to Sever and Part Lot Control applications
  • Draft Plan of Subdivision Design and applications
  • Land Development Feasibility Review
  • Planning Justification Reports
  • Professional representation at the Local Planning Appeal Tribunal
  • Electronic topographic surveys
  • Design of municipal services for land development projects
  • Design of public sewer and water systems
  • Design of public roads
  • Processing of applications for municipal approval
  • Preparation of specifications and tender documents
  • Contract administration and inspection services
  • Construction survey layout
  • Transient noise generation and mitigation studies for residential developments
  • Review of building envelope for compliance with noise impact studies
  • Stormwater management design and implementation studies
  • Flood control and master drainage plans
  • Erosion and sediment control design
  • Building design
  • Preparation of working / construction drawings
  • Structural inspections and evaluations
  • Analysis of structural systems
  • Heating, ventilation and air conditioning
  • Domestic plumbing & drainage
  • Process piping
  • Sprinklers
  • Cooking ventilation/suppression systems
  • Indoor/outdoor lighting (including photometrics)
  • Indoor/outdoor power distribution
  • Fire alarm systems

Company Affiliation & Memberships

  • Professional Engineers Ontario

  • Association of Consulting Engineering Companies

  • Illuminating Engineering Society of North America

  • Consulting Engineers of Ontario

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

  • Ontario Professional Planner Institute

  • Canadian Institute of Planners