Single Stringer stairs give the most open look of any type of stair and are often described as modern and contemporary.

straight single stringer staircaseThese stairs have heavy-duty center beams that make the stair capable of handling 300 lbs per tread, and can go up nearly any height.

The modern and contemporary single stringer can be made from:

  • 4″ x 6″ steel rectangular tube
  • 6″ x 8″ steel rectangular tube
  • 6″ x 6″ steel square tube
  • 6″ x 6″ steel square tube on diamond
  • 4″ round steel tube
  • 6″ round steel tube
  • Tri-Frame stair configured from (3) pipes
  • and more
single stringer staircase with cable railing

These stairs can be made in almost any configuration:

  • Straight-line
  • L-shaped
  • U-shaped (aka switchback stair or scissor stair)
  • Geometric winder treads
  • Combined with curved stairs or spiral stairs!

The Single Stringer composed of a triangular frame.

single1This stair is extremely rigid while giving the most open look of any stringer stair available today.

The picture on the left shows the stairs being made right here in New York. The treads are laser cut.

Then the riser supports are welded near the front of the tread, and the back of the tread is welded to the stringers.

This stair is extremely strong, and can support 300lbs per step.


The single stringer stair can have nearly any kind of tread and riser detail.

This 3d Rendering of our mono stringer staircase shows a single I-beam support in the middle. It has a decorative riser support system that is welded to the tread plate to support wooden tread covers.

The decorative riser support also reduces deflection over the width of the tread left to right. The modern feel of this stair can be accentuated by a variety of styles in the riser plates. Staircases like these can have a variety of finishes to match your decor.


This I-Beam Single Stringer stair is a simple and semi-industrial looking staircase.

It combines the steel I Beam with a simple steel plate riser wedges and tread plates with the wood steps.

Depending upon the span, larger I-Beams can be used to increase strength. The width of the stair can be up to 42″ in this design without additional steel support under the tread. This modern stair can have a high-tech look with glass treads and stainless steel rails, or it can look more industrial with diamond plate steps and wrought iron railing.


This is a single stringer staircase with a 4″ x 4″ steel tube structure.

The 3/8″ tread plates are supported by 3/8″ plate riser wedges that are welded to the center support.

The Single-Stringer Staircase can have a high-tech style when combined with stainless steel hardware, stainless steel railings, or it can take on an industrial look with diamond plate treads and a wrought iron banister.

Call Acadia Stair’s design consultants to go over your layout, connection points, and pricing. We will help you with optional treads, railings, spindles that are available for each model we make.


This is a single stringer stair with oak treads.

single5It has 4″x6″ steel tube center stringer support with 4″x6″ steel tube riser wedges welded flush to it.

3/8″ plates are then welded to the riser wedges to support the treads.

The stair tread plates are pre-drilled with counter sunk holes for the cleanest appearance on the under side.