The opposite of dismantles can be another word that means to assemble or to construct. Some common antonyms for dis-mantles include build, erect, assemble, construct, put together, and set up. These words imply the act of putting things together or creating something new, in contrast to disassembling or taking apart. Dismantling involves taking something apart piece by piece, while assembling implies putting things together in a logical and orderly fashion. In essence, dismantling is the negative counterpart to assembling; both involve the use of tools and careful planning, but with the goal of creating a completely different outcome.