A luminaire assembly is disclosed comprising a mounting part (2, 7) configured to be attached to a wall or ceiling, a luminaire part (1) configured to be attached to the mounting part (2, 7), and at least one resilient plug (6) and at least one slot configured to engage with each other for attaching the luminaire part (1) to the mounting part (2, 7) without further tooling needs. The luminaire assembly may further comprise plug and play electrical connectors for making the electrical connection between the luminaire part (1) and the mounting part (2, 7). Also a method for mounting a luminaire assembly to a wall or ceiling is disclosed. The method allows an installer to safely mount the luminaire and make connect the electrical wiring with a minimum of additional tooling or additional hands.