das Schulhaus
school building
The building in which a school is housed.
Das alte Schulhaus wird nächstes Jahr renoviert.
The old school building will be renovated next year.

school building
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school building
The building in which a school is housed.
Das alte Schulhaus wird nächstes Jahr renoviert.
The old school building will be renovated next year.

The word 'Schulhaus' (school building) is a simple compound made up of 'die Schule' (school) and 'das Haus' (house). So it literally refers to the house in which a school is located.
Die Kinder treffen sich morgens vor dem Schulhaus.
The children meet in front of the school building in the morning.
Pay attention to the difference with the preposition 'in': Movement toward a place requires the accusative ('ins Schulhaus gehen' — to go into the school building), while location at a place requires the dative ('im Schulhaus sein' — to be in the school building).
Die Schüler dürfen während der Pause nicht im Schulhaus bleiben.
The students are not allowed to stay in the school building during the break.
The term 'Schulhaus' (school building) is especially common in southern Germany, Austria, and Switzerland. There, it can be considered the standard term for the school building.
In unserem Dorf in Bayern gibt es nur ein kleines Schulhaus.
In our village in Bavaria, there is only one small school building.
school
'die Schule' and 'das Schulhaus' can both mean the building where lessons take place. However, 'die Schule' is much broader: it can also mean the institution or the lessons. 'das Schulhaus' means only the building itself. Depending on the region, it also sounds a little less everyday than 'Schule'. If you definitely mean the building, 'Schulhaus' is more precise; in normal everyday language, 'Schule' is often enough.

Vor dem Schulhaus steht seit gestern ein neuer Fahrradständer.
There has been a new bike rack in front of the school building since yesterday.
Die Schule liegt direkt neben dem Sportplatz.
The school is located right next to the sports field.