An elevator arrangement (100;200), comprising a hoistway (1;21); and one or more vertically oriented guide rail lines (2,3;22,23) in the hoistway (1;21) for guiding vertical movement of one or more movable elevator units (4,5); and one or more movable elevator units (4,5;24,25) mounted in the hoistway (1;21) vertically movably along one or more guide rail lines (2,3;22,23), including at least an elevator car (4;24), preferably also a counterweight (5;25); and a hoisting roping; and a movable support structure mounted (7;27) in the hoistway (1;21) for supporting said one or more movable elevator units (4,5;24,25) below it via said hoisting roping; and a hoisting machine (8;28) on the movable support structure (7;27) for moving the hoisting roping (6;26), for thereby moving said one or more movable elevator units (4,5;24,25); said movable support structure (7;27) comprises a body portion (9;29) and a shelf structure (10;30) projecting laterally from the body portion (9;29), and the hoisting machine (8;28) is mounted on the shelf structure (10;30) characterized in that one or more of said one or more vertically oriented guide rail lines (2,3;22,23) comprises guide rail sections (2a,3a) piled on top of each other, and said hoisting machine is displaceable between a first position and a second position, wherein in said first position the hoisting machine is on top of an uppermost guide rail section (2a,3a) of one or more vertically oriented guide rail lines (2,3) and/or below a guide rail bracket mounted in the hoistway (1;21) such that the vertical projection of the hoisting machine, in particular the vertical projection of the motor and/or the drive wheel thereof, overlaps with the vertical projection of the guide rail section (2a,3a) in question and/or the guide rail bracket in question, and in said second position the hoisting machine is displaced such that the vertical projection of the hoisting machine, in particular the vertical projection of the motor and/or the drive wheel thereof, and the vertical projection of the guide rail section (2a,3a) in question and/or the guide rail bracket in question are beside each other. a hoistway (1;21); and one or more vertically oriented guide rail lines (2,3;22,23) in the hoistway (1;21) for guiding vertical movement of one or more movable elevator units (4,5); and one or more movable elevator units (4,5;24,25) mounted in the hoistway (1;21) vertically movably along one or more guide rail lines (2,3;22,23), including at least an elevator car (4;24), preferably also a counterweight (5;25); and a hoisting roping; and a movable support structure mounted (7;27) in the hoistway (1;21) for supporting said one or more movable elevator units (4,5;24,25) below it via said hoisting roping; and a hoisting machine (8;28) on the movable support structure (7;27) for moving the hoisting roping (6;26), for thereby moving said one or more movable elevator units (4,5;24,25); said movable support structure (7;27) comprises a body portion (9;29) and a shelf structure (10;30) projecting laterally from the body portion (9;29), and the hoisting machine (8;28) is mounted on the shelf structure (10;30) characterized in that one or more of said one or more vertically oriented guide rail lines (2,3;22,23) comprises guide rail sections (2a,3a) piled on top of each other, and said hoisting machine is displaceable between a first position and a second position, wherein in said first position the hoisting machine is on top of an uppermost guide rail section (2a,3a) of one or more vertically oriented guide rail lines (2,3) and/or below a guide rail bracket mounted in the hoistway (1;21) such that the vertical projection of the hoisting machine, in particular the vertical projection of the motor and/or the drive wheel thereof, overlaps with the vertical projection of the guide rail section (2a,3a) in question and/or the guide rail bracket in question, and in said second position the hoisting machine is displaced such that the vertical projection of the hoisting machine, in particular the vertical projection of the motor and/or the drive wheel thereof, and the vertical projection of the guide rail section (2a,3a) in question and/or the guide rail bracket in question are beside each other.