Custom Single Stringer Stairs

Single stringer stairs have the most open look of any type of stair. With heavy-duty center beams, single stringers are capable of handling 300lbs. per tread and can go up to nearly any height. Single stringers are one of three types of straight staircases designed by Acadia Stairs. They have one stringer (a structural feature that supports the treads and risers) that runs down the center of the staircase.

Single Stringer Straight Staircase with Glass Railing

Features

Straight single stringer stairs are flexible in design, making it easy to create a finished product that matches your original vision. They can boast a variety of features, including:

  • Triangular frame
  • Extremely rigid
  • Open look
  • Laser-cut treads that can support up to 300lbs.
  • Designed with any type of tread, riser, or finish to match your décor
Wooden Single Stringer Straight Staircase with Metal Railing

Configurations

No matter what space you’re working with, our team can create a design that is both functional and complementary to the other features in your home or office. This type of staircase 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 or spiral stairs
Wooden Single Stringer Straight Staircase with Metal Railing

Materials

We work with you to design and build single stringer straight stairs tailored to your needs and vision. Choose from a variety of materials:

  • 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

Todd answered our questions patiently and was generous with his time. He even provided SEVERAL drawings as we thought through what we wanted and made changes – sometimes multiple a day. He never complained that he was too busy and when we didn’t understand something, he amended drawings with arrows, labels, and extra descriptions. We had no idea there was so much to consider when purchasing stairs! The stringers arrived sooner than promised and look beautiful. Once they had arrived, Todd advised on how best to install them as we were doing the work ourselves. We are very happy with Acadia’s services and would recommend them to friends without hesitation.

Elizabeth

Our Work

At Acadia Stairs, we have worked on a wide variety of custom single stringer staircases, designing and building to the exact specifications of your space. Feel free to check out our gallery page to view some of our finished work and gain a better understanding of our style, approach and versatility. Our team of designers will work with you to create a staircase that works for you, but below are just a few examples of single stringer stair designs we can create:

I-Beam Single Stringer Stair Diagram

I-Beam Single Stringer Stair

The I-Beam Single Stringer staircase is a simple and semi-industrial design. It combines the steel I-Beam with simple steel plate riser wedges and tread plates with wood steps. 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 a more industrial appearance with diamond plate steps and wrought iron railing.

4" x 4" Steel Tube Structure Diagram

4″ x 4″ Steel Tube Structure

The single stringer staircase can have a high-tech style when combined with stainless steel hardware and stainless steel railings. It can also take on an industrial look with diamond plate treads and a wrought iron banister. 

In this 4” x 4” steel tube structure we used 3/8″ tread plates that are supported by 3/8″ plate riser wedges, which are then welded to the center support.

Single Stringer Staircase with Oak Treads

Single Stringer with Oak Treads

Our single stringer with oak treads features 4″ x 6″ 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 countersunk holes for the cleanest appearance on the underside.

If you’re interested in our single stringer straight stairs, then call Acadia Stair’s design consultants today to get started!

Frequently Asked Questions (FAQs)

Single stringer stairs have a single central beam that supports the steps. This design gives the stairs a clean, open appearance while keeping them strong and stable. It’s a popular choice for modern spaces because of its sleek and minimalist look.

Single stringer stairs are a great option if you’re looking for something that’s both stylish and functional. They create a floating effect, making your space feel more open. Plus, you can customize the treads and handrails to match your interior, giving you plenty of design flexibility.

Yes, single stringer stairs can be designed in different configurations. You can go with a straight-line design, an L-shape, or a U-shape (also called a switchback). You can even combine them with other styles, like curved or spiral stairs, for a unique look.

We offer a variety of materials to build your single stringer stairs. Options include rectangular or square steel tubes, round steel tubes, and even a tri-frame design made from three pipes. These materials are strong and give your stairs a modern, durable finish.

You can fully customize your single stringer stairs. From the type of stringer to the treads and handrails, you have control over the design. It ensures the staircase fits your space and style, whether you’re installing it in a home or a commercial building.

Yes, single stringer stairs are built to be safe and durable. The central stringer provides strong support for the steps, and we use high-quality materials so that the stairs last for years. They’re designed for everyday use and built to handle the wear and tear of daily life.

Not necessarily. Maintenance depends on the materials used. Wood treads may require occasional refinishing, while metal and glass treads need periodic cleaning. The steel stringer is highly durable and resistant to wear, needing only occasional dusting or wiping. If you opt for open risers, dust accumulation underneath is reduced compared to traditional stairs. Routine inspections ensure long-term performance, but overall, these stairs are low-maintenance.

Yes! Single stringer stairs work beautifully in both settings. Residential installations create an open, elegant feel, making spaces look larger and more modern. In commercial spaces, such as offices, showrooms, or retail stores, they add a sophisticated, high-end appeal. We design each staircase to meet local building codes, ensuring safety and compliance for any setting.

Installation begins with precise measurements and design planning. Once fabricated, the staircase is shipped and installed by professionals. The process involves anchoring the steel stringer securely, attaching the treads, and installing railings. Depending on the complexity, installation typically takes a few days. For nationwide deliveries, we provide detailed installation guides and support for contractors. Proper planning ensures a smooth, efficient setup.

While the initial cost may be higher due to custom fabrication and premium materials, single stringer stairs offer long-term value. Their durability, modern appeal, and space-saving design add resale value to your property. The open aesthetic can reduce the need for additional lighting, and their timeless style minimizes the need for future renovations. Investing in high-quality stairs can enhance both function and design.

Yes! One of the biggest advantages of single stringer stairs is their space efficiency. They take up less visual and physical space than traditional staircases, making them ideal for smaller homes, lofts, or apartments. Their open design allows more light to flow through, preventing spaces from feeling cramped. If space is limited, we can customize the staircase to maximize functionality while maintaining aesthetics.

Yes, and we ensure all designs comply with local codes. Building codes typically dictate tread depth, riser height, railing height, and load-bearing capacity. If installing in a commercial space, additional regulations may apply. We work closely with clients to ensure compliance while maintaining design integrity. Before ordering, it’s important to check with local authorities or a contractor to ensure smooth approval.

Yes! Single stringer stairs can be designed for outdoor use with weather-resistant materials. We offer galvanized or powder-coated steel for the stringer, and treads can be made from weather-resistant hardwoods, composite materials, or perforated metal. Proper drainage and coatings help prevent rust and deterioration. Outdoor applications are great for decks, balconies, and garden access, providing a stylish yet durable solution.

A common misconception is that they are weak or unstable due to their minimalist design. In reality, they are engineered for strength and can hold significant weight. Another myth is that they are difficult to install—while they require professional installation, they are no more complex than other custom staircases. Some also believe they don’t fit traditional homes, but with the right materials and finishes, they can complement classic, industrial, or rustic styles

Tread material affects aesthetics, maintenance, and safety. Wood provides warmth and traditional appeal, while glass enhances a modern, airy look. Metal treads are great for industrial designs, and stone or concrete adds a bold, luxurious touch. Consider durability, slip resistance, and maintenance. If you prefer a softer surface, wood with anti-slip coatings is a great option. We help clients choose the best materials for their space and lifestyle.