This is the 783rd most frequent Swedish word.
byggår
Year of construction.
Here, 'byggår' is used as a noun referring to the year of construction of the building.
Det gamla bibliotekets byggår är 1923.
The old library's construction year is 1923.
In this sentence, 'byggår' is used in its definite form ('byggåret') to specify the construction year indicated for the particular house.
Byggåret för detta hus anges på skylten ovanför dörren.
The construction year for this house is indicated on the sign above the door.
Here, 'byggåret' is used in its definite form and shows how knowing it gives insights into the building's history.