self-building
adjectiveUK /ˌself ˈbɪldɪŋ/
US /ˌself ˈbɪldɪŋ/
Something self-building puts itself together without help from people.
The toy robot is self-building and snaps together on its own.
OTHER MEANINGS
2. A building or structure that builds or completes itself over time.
The self-building house grew a new room every year.
3. The act of building something by yourself, without hired help.
Their self-building of the cabin took two summers.
4. In computing, software that compiles or sets itself up automatically.
The self-building program installed all its own files.