Antonyms for the word "prefabs" may include terms such as handmade, customized, and individualized. The word "prefabs" typically refers to buildings or structures that are mass-produced, standardized, and produced in a factory setting. In contrast, handmade structures are often created by artisans and craftsmen, with each piece designed and constructed individually. Customized structures are tailored to meet specific needs and preferences, while individualized structures reflect the unique style and personality of the creator or owner. These alternatives to prefabricated structures offer more flexibility, creativity, and personalization than standard prefabs, making them a popular choice for those seeking a more unique and personalized living or working space.