Louis-Pierre Grégoire

Louis-Pierre Grégoire (L-P) is a partner in Gowling WLG's Ottawa office. He is certified by the Law Society of Ontario as a specialist in construction law. He also holds a civil engineering degree.

L-P's passion is construction. His practice focuses on construction law, commercial litigation and dispute resolution. He advises many parties in the construction industry, including: financial institutions, sureties, owners, contractors, subcontractors, material suppliers, entrepreneurs, consultants (engineers and architects), manufacturers, building officials and home inspectors.

L-P is also an active member of trade and industry associations, including as a founding member of the Ottawa Young Construction Leaders, a networking group focused on young professionals within the Ottawa Construction Association. He is also a frequent speaker on various topics related to the construction sector, including, in particular, the modernization of the new Construction Act in Ontario.

L-P is regularly cited by leading guides to legal talent, including Best Lawyers and Lexpert, for his leadership and experience in the area of construction law. His accolades include recognition as a "Lawyer of the Year" by Best Lawyers Canada 2023. He is a problem solver by nature, and is best known for his practical risk-based advice.

Fluently bilingual, L-P practises in both English and French.

Career & Recognition

Filter timeline:


  • Association des juristes d'expression française de l'Ontario
  • Canadian Bar Association
  • Ottawa Construction Association
  • The Advocates' Society
  • Law Society of Ontario
  • Toronto Construction Association

Representative Work

  • Represented a major Canadian airline in connection with a $2 million claim against consultants for design errors.
  • Represented a teaching hospital in Ottawa and a general contractor in a series of proceedings in connection with a $10 million claim for electrical design errors committed by professional consultants (engineers and architects) in a renovation project.
  • Defended the interests of the City of Ottawa in a civil action concerning the title of a property.