Commercial Greenhouse Manufacturer for Professional Growers
Harnois Greenhouses is a Canadian commercial greenhouse manufacturer serving professional growers across Canada, the United States and Mexico, with a growing presence in international markets. We design and install engineered greenhouse structures optimized for snow load, light transmission and year-round climate control for vegetables, flowers, nurseries and retail garden centres.
commercial greenhouse for professional growers
Built for commercial growers, each model combines structural strength, light optimization, and disease-reducing design to support higher yields, consistent quality, and long-term profitability.
With more than 60 years of experience and over 10,000 greenhouse installations across North America, Harnois has earned the trust of growers in vegetables, ornamentals, berries, and nursery production. Our four proven greenhouse systems provide the flexibility, performance, and durability required for modern large-scale horticulture; especially in the harshest climates.
+60
years of commercial greenhouse engineering
+10 000
installations worldwide
+20
patented technologies
+30m
sq. ft. of agricultural production supported
Designing your controlled growing environment
By rethinking established greenhouse concepts, Harnois develops structures and technologies that meet the evolving demands of commercial agriculture. Our iconic Gothic profiles and proprietary oval-tube framing enhance natural light, reduce disease pressure, and create consistent growing conditions. With innovations like Canada’s first modern glass greenhouse, we combine energy-efficient engineering with sustainability; offering growers more than a structure, but a long-term production solution.
Commercial Greenhouse Manufacturer in North America
For over six decades, Harnois Greenhouses has been designing, manufacturing, and installing commercial greenhouse structures adapted to the climate realities and production targets of North American growers. As a trusted commercial greenhouse manufacturer, we support horticultural, market-garden, institutional, and research growers with turnkey solutions that deliver long-term performance.
Our engineering expertise, personalized approach, and ability to deliver high-performance commercial greenhouses throughout Canada and the United States make Harnois one of the most experienced greenhouse manufacturers in the industry.