La maison bleue
Here's a breakdown:
* La is the feminine definite article (the)
* maison is the word for "house"
* bleue is the feminine adjective for "blue"
You can also say:
* Une maison bleue (a blue house)
* Le chalet bleu (the blue chalet)
The choice depends on the context and whether you are referring to a specific house or a general idea.