About Sulpher Construction


Sulpher Construction has been in the building industry for almost seventy years, evolving from a small masonry business to a full-service general contracting company specializing in complex civil/ environmental infrastructure projects. We’re known for our expertise in municipal wastewater and water treatment facilities, but we also provide general construction services to the industrial, institutional, and commercial sectors of the industry.

Founded in 1952 by James Crescent (JC) Sulpher and now leading into its third generation, Sulpher Construction is a family business with large-scale expertise, processes, and industry networks. Our pride in our family legacy drives us forward with integrity, honesty, and a commitment to getting the job done right.

With offices in both Ottawa and Kingston, we service all regions across Eastern Ontario – from Sault Ste. Marie to Cornwall and everywhere in between, we go where our clients’ needs take us.


As a trusted building partner for almost seven decades, our philosophy has been simple: we treat every project, big or small, as if it’s our own. This means we get to know our clients’ needs inside and out to eliminate surprises, stay ahead of issues, and proactively solve problems at every phase of the project, from quote to planning to construction and beyond.


We’re committed to providing accurate, transparent, and thorough quotes. Our long history of relationship building in the industry and vast network of highly qualified, industry-leading subcontractors and suppliers means we’re able to offer very competitive pricing without sacrificing quality of work.


We know that the successful implementation of any project starts with good planning. We combine decades of experience across construction sectors with the best planning software to ensure on-time, on-budget project delivery and to manage expectations, complexity, and risk throughout.


We take a solution-based approach that’s both goal-focused and responsive to changing needs. Clients can be assured that the job will be done on time, on budget, and to the highest standards of quality, safety, and care.


We know our responsibility to clients doesn’t end when the project does. We stand by the quality of our work and provide responsive aftercare to address any concerns or issues that may arise.


And our core values of integrity, service excellence, and commitment to quality results.