Ugly Dirt House

The Ugly Dirt House was Ilsa's temporary house when she was building her underwater house.

playing minecraft :) (episode 1)
Ilsa builds the house, says she is aware of it's ugliness, then explains her idea and that it is only temporary. She later places wood on the window and sleeps in the bed at night. Later in the episode, she says that she will start moving into her new house, and she's tired of "this little box" and that she wants to live under the sea. Even later in the episode, when she is done making her house pretty, she pulls out a shovel and says "Goodbye ugly house. You will not be missed."

the comments teach me minecraft :) (episode 2)
The Ugly Dirt House is mentioned when Ilsa stated that she would keep an OG bit of her house OG, "other than the dirt house".

Trivia

 * This is the only structure (as of now) to get destroyed completely.