From Longman Dictionary of Contemporary Englishself-assemblyˌself-asˈsembly adjective DSEPARATEself-assembly furniture is sold as separate parts that you put together yourself at home
Examples from the Corpus
self-assembly• It can be explained largely by adhesive affinities leading to self-assembly.• A detailed leaflet with illustrations is available for self-assembly, but the company offers a complete installation service as well. 