Royal Door Ltd is a leader in the Automatic entrance system industry. Founded in 1981 in Tracadie-Sheila, the company is now headquartered in the Moncton, New Brunswick area and has an office in Dartmouth, Nova Scotia to better serve Atlantic Canada's construction industry.

On August 29, 2014, NABCO Canada, Inc. acquired Royal Door Limited. NABCO Canada, Inc. is a wholly owned subsidiary of NABCO Entrances, Inc. and is part of the Nabtesco family of companies, a leading global supplier of pedestrian automatic entrances. Royal Door Limited is a leading supplier of automatic pedestrian entrances and architectural storefronts to the Atlantic Canada market.