The phrase "building in" can refer to a variety of actions including constructing a new building, adding onto an existing one, or incorporating something into a structure. Some synonyms for this phrase include "erecting," "raising," "erecting," "putting up," or "installing." These terms all convey the idea of creating something new or adding to an existing framework. Additionally, the phrase "building in" can also be replaced with "incorporating," "integrating," or "fitting in," which emphasize the importance of seamlessly blending something into an existing space. Overall, the many synonyms for "building in" highlight the versatility and importance of creating and perfecting the physical spaces around us.