Stairs spiral model Berlin

Hole in the ceiling - minimal for stairs with a diameter of 140 cm
Hole round 150 cm,
Hole square 150x150 cm,
stairs height 280,0-322,0 cm (landing flush with the upper floor),
stairs height 300,0-345,0 cm (landing below the upper floor),
step height constant 20,0 / 23,0 cm,
usable width of 600 mm (between the pole and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimal for stairs with a diameter of 130 cm
Hole round 140 cm,
Hole square 140x140 cm,
stairs height 280,0-322,0 cm (landing flush with the upper floor),
stairs height 300,0-345,0 cm (landing below the upper floor),
step height constant 20,0 / 23,0 cm,
usable width of 550 mm (between the pole and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimal for stairs with a diameter of 120 cm
Hole round 130 cm,
Hole square 130x130 cm,
stairs height 280,0-322,0 cm (landing flush with the upper floor),
stairs height 300,0-345,0 cm (landing below the upper floor),
step height constant 20,0 / 23,0 cm,
usable width of 500 mm (between the pole and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimal for stairs with a diameter of 110 cm
Hole round 120 cm,
Hole square 120x120 cm,
stairs height 280,0-322,0 cm (landing flush with the upper floor),
stairs height 300,0-345,0 cm (landing below the upper floor),
step height constant 20,0 / 23,0 cm,
usable width of 450 mm (between the pole and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 110 cm
circle opening 120 cm,
square opening 120x120 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 450 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 120 cm
circle opening 130 cm,
square opening 130x130 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 500 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 130 cm
circle opening 140 cm,
square opening 140x140 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 550 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 140 cm
circle opening 150 cm,
square opening 150x150 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 600 mm (between the post and the balustrade),
stair treatment: left or right

Opening in the ceiling - minimum for stairs with a diameter of 150 cm
circle opening 160 cm,
square opening 160x160 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 650 mm (between the post and the balustrade),
stair treatment: left or right