Brett Lessard B.A.Sc., P.Eng.

Associate, Civil/Structural & Building Science
Direct: (416) 368-1700

Our Associates perform on-site investigations to determine origin and cause of complex losses. Their process: examine and collect evidence, take on-site photos, interview witnesses, conduct testing in our lab and analyze data to produce technical reports that are clear and concise.



Mr. Lessard is an Associate with the Building Science team in the Civil/Structural group at 30 Forensic Engineering. He graduated the University of Toronto with a Bachelor of Applied Science and Engineering with a minor in Sustainable Energy. Mr. Lessard began his career in residential structural engineering for new construction of small buildings before focusing on the  restoration and repair of existing buildings, first in structural restoration followed by building envelope restoration. Mr. Lessard is experienced in construction details for repair and restoration of building envelopes of varying scopes and ages, and since joining 30 Forensic Engineering has conducted investigations involving wind losses, water losses and fire losses.


  • Building Envelope
  • Building Condition Assessments
  • Repair and Restoration of Buildings
  • Investigation of building, property, and construction failures


Bachelor of Applied Science and Engineering, Civil Engineering, Minor in Sustainable Energy, University of Toronto, Toronto, Ontario, 2016


30 Forensic Engineering
Associate, Building Science
2022 – Present, Toronto, ON

  • Perform site investigations to collect information pertaining to incident losses in buildings including wind losses, water losses, fire losses and remediations.
  • Review record drawings and documents related to the incident loss to determine contributing factors and inform repair/restoration to pre-loss condition.
  • Focus on building envelope assemblies such as roof, wall, window, and assembly transition details.

RJC Engineers
Building Science Engineer
2017 – 2022, Toronto, ON

  • Perform building condition assessments, site investigations, and water leak assessments of existing building envelope elements – from grade and working-at-heights.
  • Prepare reports for building owners, property managers and project architects including observations, recommendations and project estimates for building envelope restoration and repair programs.
  • Prepare design drawings and contract documents, project tendering and contract administration during construction phases including site review, shop drawing reviews and close-out.
  • Experienced in reviewing heritage masonry, fireproofing and firestopping and moisture-related deterioration, in addition to typical building envelope construction materials and methodologies.
  • Visual assessment and water testing of dozens of buildings via Bosun’s chair.

Stephenson Engineering
Engineer-in-Training, Concrete Restoration
2016 – 2017, Richmond Hill, ON

  • Performed review of ongoing concrete repair & construction and waterproofing applications on residential and commercial properties (parking garages and podium decks).
  • Performed review of concrete balconies and parking garages on residential and commercial properties, noting and compiling deficiencies in reports.
  • Contract administration per Canadian Construction Documents Committee (CCDC).

Picco Engineering
Engineer-in-Training, Structural
2013 – 2014, Woodbridge, ON

  • Performed structural reviews of residential housing – private and semi-detached, townhouse blocks and renovations/restorations – constructed with timber framing.
  • Designed timber and steel beams, steel lintels and base plates and concrete slabs, footings and foundation walls according to design codes.
  • Accompanied and assisted supervisor with site inspections and created reports.


  • Professional Engineers Ontario (PEO), Member
  • Ontario Building Envelope Council (OBEC), Member