Want to find a high quality constructor for your projects?

Your work is our work

Construction requires not only an analysis that plans things perfectly, but also the desire to create the best possible work.


Construction Interlag inc. has been working in different fields of civil engineering for more than 20 years. Our projects are mainly focused on bridges, viaducts, steel and concrete structures, industrial buildings, power plants and hydroelectric dams.

Our main clients are major public sector donors such as, among others, the Jacques Cartier and Champlain Bridge Company Inc., the Quebec Department of Transportation, Hydro Quebec, the Port of Montreal Administration and Public Works Canada (PWGSC) ) as well as important clients from the private sector. Our specialties include the construction of structural concrete structures and steel structures, the rehabilitation of major concrete structures, the reinforcement of steel structures and structural reinforcement work.

Robert Lagendyk, ing. President

why choose us?

This is not a cliche, our team of experts hired carefully makes the difference!
Meeting deadlines is more than a way of talking at Interlag. Extensions may be necessary, but we pride ourselves in minimizing the number.
Even after more than 20 years of experience, we know that each contract is an opportunity to be even better. Thank you to all our past, current and future customers who allow us to strive for excellence.

In numbers



Created especially to succeed on your sites

They trust us


Our active sites

Eurovia Québec Grands Projets inc.

Subcontract for work on demand south of Montreal in the MTQ contract 2513-19-0201 On-demand contract for repairs to various structures in the south sector

RailTerm Inc.

MTR418988 – Railway bridge rehabilitation over Mississippi river at MP 21.00 on the Renfrew subdivision in Ontario, Canada

Ministère des Transports Québec

2503-21-0202 – Reinforcement and repair work on the beams and slab of the Île-aux-Tourtes bridge, located on Highway 40, over the Ottawa River, in the village of Senneville and the city of Vaudreuil-Dorion, outside the MRC and MRC Vaudreuil-Soulanges, electoral divisions of Jacques-Cartier and Vaudreuil

Construction Demathieu Bard Inc.

Subcontract for the installation of the PTE blocks and the permanent PTE in the MTQ contract 2503-19-0217 Repair of the St-Pierre Interchange Structures – Lot 6 – Intersection A-20 and Route 138

Ministère des Transports Québec

2503-19-0210 – Contract on demand for priority slab repair work, beams and various elements on Ile-aux-Tourtes bridge located on highway 40, above the Ouatouais river, link between Vaudreuil-Dorion city and Senneville town, Outside RCM and RCM of Vaudreuil-Soulanges, electoral districts of Vaudreuil and Jacques-Cartier.

Action is better than a thousand good intentions - Construction Interlag!