Harnois Industries

Harnois Greenhouses is a division of Industries Harnois Inc., a Canadian manufacturer of steel structures. We are a steel structure manufacturer, doing business through two distincts divisions: Harnois Greenhouses and MegaDome. We provide greenhouse structures and equipment to ornamental and vegetable growers, as well as multipurpose fabric buildings for the protection of goods and activities in multiple market segments. We serve a varied customer base across North America, as well as parts of Africa, Europe and Asia.

Company details

1044 rue Principale , St-Thomas , Quebec J0K 3L0 Canada

Locations Served

Business Type:
Industry Type:
Agriculture - Horticulture
Market Focus:
Globally (various continents)

This company also provides solutions for other industrial applications.
Please, visit the following links for more info:

Irrigation St-Thomas
Irrigation St-Thomas is incorporated. Main activities: sale of irrigation systems and agricultural equipment specialist.
Diversification into the greenhouse manufacturing industry.

Major innovation
First installation of greenhouses with double, inflated polyethylene in Canada.

Construction of the first complex of gutter connected greenhouses in Quebec.

Introduction of aluminium fasteners
Introduction of aluminium fasteners to Canada dedicated to securing greenhouse polyethylene films.

Industries Harnois Inc.
St. Thomas Irrigation Inc. changes its name and becomes Industries Harnois. to better reflect its diversification.

First company to use tubular steel
First company in North America to use tubular steel in the manufacturing of oval arches for greenhouses.

First Expansion
Industries Harnois opens up for business in the U.S.

Second Expansion
Industries Harnois opens up for business in Mexico.

On-site curved glass cover
Design and manufacturing of a greenhouse with on-site curved glass cover.

The 90 mm Oval Tube
First Introduction of the famous 90 mm oval tube.

Introduction of Galvalume
Introduction of Galvalume® treated tubing, with protective clear coating.

Third expansion
Industries Harnois Inc. opens up for business in Japan.

Design and implementation
Design and implementation of a gutter connected greenhouse specifically developed for the Mexican market: the MX2000

Welcome Luminosa!
Launch of the Luminosa greenhouse that is a wider and higher updated version of the MX2000 greenhouse. Productivity within the Luminosa is optimized and users can obtain higher yields than what is common on the market. Patrice and Yanick Harnois take over from their predecessors to ensure the continuity of the company.

Launch of the TunnelPro
Launch of the high tunnel named TunnelPro

Optimized Luminosa Marketing
Marketing of an optimized Luminosa, 11 m wide and 6 m high