It is observed on the ‘First Monday of October’.

On the first Monday in October, World Architecture Day shows appreciation for the work that architects do. The day also encourages learning more about architecture throughout the world. Architecture involves the planning, designing, and constructing process of buildings and other physical structures.

The International Union of Architects (UIA) designed World Architecture Day in 1985. The first Monday in October was chosen as it coincides with World Habitat Day. This was a way for the UIA to remind the world of its collective responsibility for the future of human habitats.

Theme for 2021: “Clean environment for a healthy world”.
Have a nice day!