Here's why:
* Houses are inanimate objects: Pronouns usually refer to people or animals (personal pronouns) or things that can be counted (indefinite pronouns). Houses are neither.
* We use "it" for inanimate objects: We typically use the pronoun "it" to refer to a house: "The house is beautiful. I love it."
However, you can use other words to avoid repetition:
* Demonstratives: "This house is beautiful. I love this one."
* Descriptive phrases: "The house is beautiful. I love the one with the blue shutters."
So, while there's no single pronoun for a house, you can use "it" or other options to refer to it in your writing or speech.