About us

We build possibilities into every project.

Founded in 1965 as Irrigation St. Thomas, MegaDome’s parent company, Harnois, began by specializing in irrigation systems and agricultural equipment. By 1968, we expanded into greenhouse manufacturing, and in 1971, under the leadership of Rolland Harnois and Yves Harnois, we designed Quebec’s first gutter-connected greenhouse complex. Throughout the 1970s and 1980s, we led the Canadian market by introducing innovative greenhouse technologies, from circulation tubes for heating to natural ventilation tunnel structures.

As our reputation grew, we became the first North American company to use oval tubes in greenhouse manufacturing in 1982, and in 1999, we launched the MegaDome® division, expanding our offerings to include fabric buildings. Over the years, we have entered markets across North America, Mexico, Japan, and beyond, all while maintaining our commitment to innovation and quality.

Today, MegaDome continues to build on Harnois’ legacy of success, providing custom fabric building solutions that reflect decades of industry expertise and a relentless pursuit of excellence.

Elevating the business of building

Who We Are

A successful project leaves nothing to chance. That’s why MegaDome has built a team of experienced, highly skilled professionals who have worked together for years, ensuring everything falls into place seamlessly. We’ve also forged long-standing relationships with trusted vendors and subcontractors, many of whom we have partnered with for over a decade. This allows us to provide our clients with smarter, more efficient solutions every step of the way.

Our client commitment

Quality isn’t just our standard — it’s an attitude that defines everything we do.

At MegaDome by Harnois, quality isn’t just about top-tier materials and craftsmanship—it’s about the strength of our partnership with clients. We understand that collaboration and open communication drive better results. That’s why we foster a culture of transparency and teamwork, ensuring every project runs smoothly from start to finish. Our commitment to treating each project with precision and care is why clients continue to trust us, project after project.

Our community involvement

Associations

3R MCDQ – Regroupement des Récupérateurs et des Recycleurs de Matériaux de Construction et de Démolition du Québec;
OGRA – Ontario Good Roads Association
CRA – Canadian Rental Association
APOM – Association des professionnels à l’Outillage Municipal
ADMQ – Association des directeurs municipaux du Québec
RIM – Réseau d’Information Municipale