The house looks like an ordinary country cottage with a hay roof, a wooden door, two small windows, grassy front garden, stone path, and a fence encompassing the house. The door's key hole is in the shape of an anchor.
The interior looks like an average country cottage would look like. It has a big kitchen with enough equipment to make Grandma's cookies, and a warm living room. In "Pet Sitter Pat," it is revealed that it also has a bedroom for Grandma SquarePants.
Role in series
I can turn into a skyscraper!
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The house appears at the end of the episode when SpongeBob apologizes to his grandma for his abrasive side's actions towards her. He sees his grandma now has an abrasive side of her own, and he screams and runs off.
"Pet Sitter Pat"
SpongeBob visits his grandma's house for her birthday. He leaves Patrick in charge of Gary while he leaves.