They can both be correct, depending on the context.
Interested in Language
Which one of this sentence is the correct?.
I am in the house or I am at the house.
"I am at the house" could mean that you are standing outside it or that you are inside it. "I am in the house" can only mean that you are inside.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.