is moved in the hoistway 1 to a height from where access to the roof of the car is possible from the topmost floor level 26 correspondingly the counterweight 5 is lifted from the bottom of the hoistway 1 to a height that corresponds to the height of the counterweight 5 when the hoisting ropes 16 are in their positions and the elevator car 3 is at the height to which it was placed before this in the aforementioned dimensioning the flexible clampings of the fixing points of the hoisting ropes 16 as well as rope stretchings are also taken into account after this the hoisting ropes 16 are installed one at a time to completion a loop 16 d is made from the first hoisting rope 16 which is lifted as a loop through the pedestal 7 over the traction sheave 9 after which the loop 16 d is led from the other side of the traction sheave 9 through the pedestal 7 downwards to back below the overhead beam 6 of the hoistway then the part of the loop 16 d formed from the hoisting rope 16 on the side of the elevator car 3 is fitted temporarily to the eyelet 27 fixed to the top rail 25 of the elevator car 3 and the locking element 28 which does not fit through the eyelet 27 is fixed to the rope above the eyelet 27 owing to this arrangement the loop 16 d can be lowered in a controlled manner to the bottom part of the elevator hoistway 1 since only the second half of the loop 16 d is lowered downwards as presented above the hoisting rope 16 can be threaded as a loop through the.