The staircase forms part of a refurbishment of a 1960s family home, named Closse Residence, by local studio Naturehumaine.
Situated in the suburban area of Saint-Lambert in Montreal, the pitched-roof property was originally designed by the client's father, but after 50 years was in need of modernisation.
The architects opened up the plan by removing partition walls and added the new staircase to create a focal point for the space. They also restored the exterior, adding a new steel roof and dormer for an upper floor bathroom.
"The existing geometry of the house is dominated by its large gable roof, so the idea for the stair was to work with a triangular geometry," studio architect Stephane Rasselet told Dezeen.
"The stair is visible from outside the house where its relationship with the roof can be viewed."
Large glazed patio doors inserted in the south facade provide exterior views of the staircase. The house also features an L-shaped porch, supported at its outer edge by a row of slim black columns and at its inner edge by the brick and timber walls, and a tall stone chimney stack.
The angular maple veneer enclosure for the staircase has two frosted and clear glass inserts, and the stairs have black steel balustrades and wide maple treads.
"The stair acts as a lantern, lighting the dining area with the use of recessed lighting and frosted glass," said Rasselet.
To one side of the staircase, a white countertop extends 2.4 metres off the end of a kitchen island to provide a dining table, merging the preparation and eating spaces.
A larger dining table sits in front of a stone wall with a restored corner fireplace.
Panels of mirror are used throughout the space to maximise the light from the large black-framed windows, but downstairs the original basement has been left intact.
"One of the client's demands was to keep the basement untouched and exactly as how his father had built it. A serious contrast with the rest of the house," said Rasselet. "Even now when the parents come visit, they enjoy spending time in the basement reminiscent of their past."
Photography is by Adrien Williams.