Twin stringer undermount stairs

For additional transparency, the mono stringer is usually replaced with two thin (5 / 8”) under mount stringers.

By default, the stringers are 6” apart and are usually placed at the centre of the staircase. For a more dramatic look, they may be placed off centre. If they are off centre, long flights can twist too much, but that issue can be remedied with a few (almost) invisible pins to the side wall.

The metal step plates are mechanically secured to the stringers and a walking surface board is glued on top.

The walking surface boards are usually ¾” thick hardwood but can be made of other materials such as tile or concrete.

If desired, the floating effect can be accentuated with box wood steps. Because box steps are more massive than the tiny stringers, the stringers become inconspicuous.

Expected PricingInstallation included
(without installation deduct 20%)

  • box steps, metal stringers, spray painted
    up to 42" wide, flat cut oak 1,200.00/step
  • quarter cut oak add 80.00/ step
  • walnut add 110.00/step
  • landing up to 42" x 42" flat cut oak 4,500.00
  • quarter cut oak add 270.00
  • walnut add 400.00
  • metal and wood steps, metal stringers, steps spray painted
  • up to 42" wide , flat cut oak 1,160.00/step
  • quarter cut oak add 20.00/ step
  • walnut add 40.00/step
  • landing up to 42" x 42" flat cut oak 4,500.00
  • quarter cut oak add 180.00
  • walnut add 300.00
  • Add 10% for up to 48" wide
  • Inquire for stairs over 48" wide