das Baujahr
year built
The year in which a building, vehicle, or technical device was manufactured.
Mein Auto ist Baujahr 2018 und hat erst wenige Kilometer.
My car is model year 2018 and has only a few kilometers on it.

year built / model year
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year built
The year in which a building, vehicle, or technical device was manufactured.
Mein Auto ist Baujahr 2018 und hat erst wenige Kilometer.
My car is model year 2018 and has only a few kilometers on it.

The word is made up of 'Bau' (from 'bauen', to build) and 'Jahr' (year). So it literally means the 'year of building' or the year of manufacture.
Das Haus, Baujahr 1920, wurde komplett saniert.
The house, built in 1920, was completely renovated.
'Baujahr' (year built/model year) is often used directly after the noun without a verb or preposition in order to specify something. In advertisements or technical data, it is often abbreviated as 'Bj.'.
Ich verkaufe mein Fahrrad, Baujahr 2021.
I am selling my bicycle, model year 2021.
The word is typically used for buildings, vehicles, and technical devices. Common combinations are 'Baujahr des Hauses' (year the house was built), 'Baujahr des Autos' (model year of the car), or 'Baujahr der Maschine' (year the machine was built).
Können Sie mir das Baujahr dieses Geräts sagen?
Can you tell me the year this device was manufactured?
construction period
'Baujahr' and 'Bauzeit' both have to do with the construction or manufacture of something. 'Baujahr' names a specific year, for example for a house, car, or device. 'Bauzeit', on the other hand, means the duration or period during which something was built. Learners may confuse the words because both begin with 'Bau-' and are often used for buildings. A simple guide is: 'Baujahr' answers 'In which year?', while 'Bauzeit' answers 'How long?' or 'During what period?'.

Beim Autokauf fragt Max zuerst nach dem Baujahr.
When buying a car, Max first asks about the model year.
Für die neue Brücke ist eine Bauzeit von zwei Jahren geplant.
A construction period of two years is planned for the new bridge.