There are various synonyms for the phrase "I need a house." Some possible alternatives include "I require a residence," "I'm searching for a home," "I'm in need of a dwelling," "I'd like to find a place to live," or "I'm in the market for a new abode." These expressions indicate a desire or necessity for a housing solution, whether for renting or owning. The specific phrasing may vary depending on the context and personal preference, but all communicate the same fundamental message of the need for a living space.