When we think about the phrase "brace houses", we typically think of buildings that require additional support to prevent them from collapsing. Some synonyms for brace houses could include "reinforce", "strengthen", or "stabilize". Other similar terms might include "bolster", "buttress", or "underpin". These different words all describe the same basic concept of providing extra support to something that might not be able to stand on its own. Whether used in construction or to describe a physical structure that requires maintenance, these synonyms help to expand our vocabulary and express similar ideas in a more nuanced way.