Ship room assembly (10) comprising: at least a first room portion (11) defining at least a first compartment (21) suitable to be integrally mounted to a ship structure (14) and at least a second room portion (12) suitable to define at least one second compartment (22), wherein said second room portion (12) is slidably constrained to said first room portion (11) passing from a first closed position in which it overlaps at least partially with said first room portion (11) to a second extended position in which it defines at least one second room compartment (22) distinct from said at least one first compartment (21), and wherein said second room portion (12), when it is in the extended position, is suitable for projecting cantilevered from said ship structure (14), and wherein said second room portion (12) surrounding said at least one second compartment (22) confining it from the external environment.