
die Hauswand
house wall
One of the outer, vertical boundary surfaces of a house.
An der südlichen Hauswand wächst wilder Wein empor.
Wild grapevine is climbing up the southern house wall.
house wall
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house wall
One of the outer, vertical boundary surfaces of a house.
An der südlichen Hauswand wächst wilder Wein empor.
Wild grapevine is climbing up the southern house wall.
This word is a simple compound made up of 'Haus' (house) and 'Wand' (wall). It therefore refers to a wall that belongs to a house, specifically an exterior wall.
Die Kinder malten mit Kreide auf den Gehweg, aber nicht an die Hauswand.
The children drew with chalk on the sidewalk, but not on the house wall.
With 'Hauswand' (house wall), the preposition 'an' is used. To describe a position, you use the dative ('an der Hauswand' — on/against the house wall). To describe movement toward it, you use the accusative ('an die Hauswand' — onto/against the house wall).
Das Fahrrad lehnt an der Hauswand.
The bicycle is leaning against the house wall.
Typical actions in connection with a house wall are: ivy grows 'an der Hauswand hoch' (up the house wall), you lean something 'an die Hauswand' (against the house wall), or someone sprays graffiti 'an eine Hauswand' (on a house wall).
Unbekannte haben in der Nacht Graffiti an die Hauswand unserer Schule gesprüht.
Unknown people sprayed graffiti on the wall of our school during the night.
facade
Hauswand can refer to any outer vertical wall of a house. Fassade specifically refers to the designed or representative exterior, often the side facing the street. Use Hauswand when naming a wall in general, and Fassade when referring more to the appearance of the front side.

Die schlichte Hauswand zum Innenhof wird im Frühjahr neu gestrichen.
The plain house wall facing the courtyard will be repainted in the spring.
Die reich verzierte Fassade zur Hauptstraße wird im Frühjahr neu gestrichen.
The richly decorated facade facing the main street will be repainted in the spring.