demountable

adj

1. Able to be removed from its mount; designed to be dismantled.
2. (dated)Designed to be removed from the read mechanism.

noun

1. (Australia)A temporary and portable building, especially a portable classroom in a school.

   “A whole row of demountables has been abandoned, the window bagged with bright orange plastic.”

   “She opened the door and looked out into the broad passageway between the wings of the demountable.”