Former Montréal Custom House National Historic Site of Canada

The Former Montréal Custom House was designated a national historic site in 1997 because:

• it is a remarkably fine example of Palladian architecture in Canada designed by John Ostell, one of the most important Montréal architects of his day;
• the construction of the custom house marked the end of Montréal's lesser importance in comparison with the Port of Québec; and
• the building serves as testimony to the growing importance and independence of the city in the early decades of the 19th century.

The Former Custom House is a striking, Palladian-style building, distinguished by its elegant façades, compact proportions and architectural detailing. It was one of the last Canadian public buildings to use the Palladian style, a style derived from English domestic architecture which achieved the height of its popularity in Canada between 1800 and 1820. Despite an extension in 1881-2 in which the south façade was reconstructed and windows and doors were added to the side elevations, the Custom House retains the effect of its original exterior appearance.

The Former Montréal Custom House was the first Montréal building designed by John Ostell, a British-trained architect who was, in that era, Montréal's most important architect. Beginning with the Custom House, Ostell designed 25 of the city's major buildings in as many years, using a variety of styles. The 1881-2 extension was designed by Alphonse Raza.

The construction of the Former Custom House in 1836-8 marks an important moment in the history of the port of Montréal, when it acquired its own customs service. Until 1828, customs duties were collected at the city of Québec, as the principal port of entry to Upper and Lower Canada. During the early 19th century, the construction of the Lachine canal, improvements to marine transportation between Québec and Montréal, greater diversification in Montréal's economy, and increasing commercial traffic with Europe led to the rapid development of Montréal's port area. The significant increase in port traffic justified the collection of customs duties at Montréal beginning in 1828. The customs house was built soon afterwards, reflecting the new importance of the port of Montréal. It soon became the major Canadian port for the transshipment of goods to and from the Great Lakes and the exportation of primary products to Europe, a role it would retain until the opening of the St. Lawrence Seaway in 1959. It served as Montréal's customs house from 1838 until 1871.