In the house is a commonly used phrase for indicating someone or something is located inside a building. However, there are many synonyms that can be used to replace this phrase and add variety to your writing or conversation. Here are some examples: indoors, on the premises, within these walls, in the building, inside the home, within the dwelling, within the abode, in the premises, in the residence, inside the house, within the domicile, within the living space, within the quarters, within the lodging. These alternatives can help to avoid repetition in your writing and provide a different perspective on the location.