Beaver Lumber (Castor Bricoleur in Quebec) was a Canadian building supply chain owned by Molson.

A new name was needed that was in some way connected to wood, so when Edwin Banbury suggested "Beaver", the company identity was created in 1906 and would become an institution in parts of Canada for another 90 years.

In 1987, Groupe Val Royal entered into a strategic agreement with the Molson Companies to acquire the Castor Bricoleur locations in Quebec and integrated them to its Brico Centre chain, a hardware retailer that was already operating three stores at the time.

[2][3] Val-Royal later launched in early 1993 the Réno-Dépôt chain with a warehouse format and made no secret that the plan was to progressively shut down the eight existing Brico stores as they were deemed too small to continue in the new economy.

Beaver Lumber's last Head Office at 7303 Warden Avenue in Markham is now home to Lyreco, Brookfield Properties and TTI.