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Public-images-osm logo.svg year_of_construction
Displays the year(s) of construction of a characteristic and can be assigned to different objects. Show/edit corresponding data item.
Group: properties
Used on these elements
may be used on nodesmay be used on waysmay be used on areas (and multipolygon relations)use on relations unspecified
See also


Status: in use

The tag year_of_construction displays the year(s) of construction of a characteristic and can be assigned to different objects. E.g. construction year(s) of historical buildings, windmills, bridges, etc. In the case of objects that have been built for several years, the last year of construction to be counted is the year of reference completion or the year from which the object as such could be used completely for the first time from a constructional point of view.

Under no circumstances should a future date be used to map objects that are currently being planned or built - this will inevitably lead to problems with rendering and routing.

How to map?

The date is written in YYYY-MM-DD format according to  ISO 8601. It is based on the  Gregorian calendar.

Exact date

If only one year is known or sufficient:

If it was build for several years:

Approximate data

If no exact date or year can be given, the following rules can be used:


'1800s' describes the period between 1800 and 1809, not 1800 to 1899.

Prefix can only be 'early ', 'mid ', 'late ', 'before ' or 'after '.

Avoid seasons. E.g. 'summer 1998', because this is interpreted differently in different hemispheres.

The tag year_of_construction=* only indicates the year(s) of construction, but not years of reconstruction or years in which objects were merely renovated / refurbished / modernized. An object must have been completely newly built.

Similar tags

See also