Can you please explain why our house would use the nous pronoun instead of the possesive on of notres, as the house belongs to us?
As Maarten says, there is not always a reason to explain how a language works but what you need to know is that the pronouns used after prepositions ( including chez) are called emphatic or stress pronouns.
Take a look at the following Kwiziq lesson -
Moi, toi, lui, elle, soi, nous, vous, eux, elles (advanced stress pronouns)
Je vais chez elle = I am going to her house
Ils vont chez eux = They are going to their house ( home)
Je suis chez moi = I am home
Bonne Continuation !
"Why" questions about fundamental grammar rules are generally unhelpful - the answer is almost always 'because that is the way it is'. Don't try to read the French with the English translation in mind, to make the 2 match - that the French use 'chez' followed by stress pronouns or nouns is the important point, and learning how and when to use 'chez ...' in French communication.
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