Floating Stairs vs Cantilever Stairs: What to Know

If you’re comparing floating stairs vs cantilever stairs, you’ve probably already noticed a problem: the terms are often used as though they mean exactly the same thing. They don’t. A cantilevered staircase can create a floating appearance, but floating stairs can use several different structural systems.

That distinction becomes important once you move beyond inspiration photos. Choosing a stair based purely on how little support you can see can lead to unexpected wall reinforcement, engineering changes or additional construction work later in the project. A staircase that appears exceptionally simple may actually depend on some of the most carefully planned structural elements in the room.

We design stairs around both sides of the equation. The finished staircase has to deliver the clean architectural look you want, but the support system behind it also needs to suit the building. Below, we’ll explain the difference between the two terms, how each system works and what we’d consider before choosing one for your home.

Floating Stairs vs Cantilever Stairs: What’s the Difference?

The simplest way to understand floating stairs vs cantilever stairs is to think of one as a look and the other as a method of creating that look.

Floating stairs are a broad category of staircase where visible support has been reduced, repositioned or concealed. Open risers and slim structural components help create the impression that individual treads are suspended within the room.

There are several ways to achieve this. A floating staircase might have a mono stringer running beneath the center of the treads, two slim steel supports or a concealed structure connected to the wall.

Cantilevered stairs are more specific. Each tread projects outward from support at one end, usually from a structural wall or a concealed steel structure built into it. When finished well, you see the tread emerging from the wall without a conventional stringer underneath.

So, a cantilevered staircase can accurately be described as a floating staircase. A floating staircase, however, isn’t automatically cantilevered.

That’s also why we wouldn’t get too hung up on the terminology used in an inspiration photo. The more useful question is always: what’s supporting the stair?

A common mistake is assuming that any stair with an open riser is cantilevered. It isn’t. Open risers affect how the staircase looks, while the cantilevered system describes how its loads are supported.

How Are Floating and Cantilever Stairs Supported?

There’s no such thing as a staircase that genuinely floats. Something has to carry the weight of the treads and the people using them.

The clever part is deciding where that structural support should go.

With cantilevered staircases, steel supports are commonly concealed within or behind the wall. Each tread projects into the room while its hidden connection transfers the load back into the main structure. Depending on the project, that can require a reinforced wall, concealed steel reinforcement or a purpose-designed framework.

This is why we strongly favor early coordination on projects where the client wants a true cantilevered appearance. If framing, utilities and wall finishes are already in place, creating room for the necessary support can become much more disruptive.

A mono stringer takes a different approach. Here, a steel beam generally runs beneath the center of the stair flight, with the individual treads attached to it. You can see more of the structure, but that doesn’t necessarily spoil the floating effect.

In fact, we’d challenge the assumption that hiding every piece of structural steel always produces the best staircase.

A carefully proportioned center stringer can become part of the architecture. Pair a slim steel beam with substantial wood treads and the contrast between the two can look intentional rather than compromised. It may also give the project team more flexibility than trying to hide every connection inside a wall.

Other stair designs use twin stringers or hybrid structural systems. Again, they can all look like floating stairs. What changes is the load transfer and where the steel needs to connect to the building.

The Detail You Shouldn’t Ignore: Movement

People naturally ask whether a staircase can hold enough weight. That’s important, but there’s another consideration that gets much less attention: how solid the stair feels underfoot.

A long projecting tread can technically have adequate strength yet still feel uncomfortable if it flexes noticeably when someone steps near its outer edge. Good engineering therefore isn’t only about avoiding structural failure. Stiffness, vibration and the feel of the finished staircase deserve attention as well.

That’s particularly relevant with cantilevered stairs because their projection emphasizes movement at the outer edge.

Which Stair System Is Better for Your Home?

There isn’t one winner.

We’d rather choose the staircase around the building than force a building to accommodate a staircase simply because a particular image looks good online.

Cantilevered stairs make a lot of sense when the goal is an extremely clean, uninterrupted architectural effect. With no visible support beneath the treads, your eye moves through and around the staircase rather than stopping at a conventional stringer.

They tend to be especially well-suited to new homes and substantial remodels where the stair can be considered alongside framing and structural design from an early stage.

A different floating stair system may be the more practical option when the surrounding wall can’t easily carry the required loads. This can also apply when you’re working with an existing home where opening finished walls or introducing significant steel reinforcement would add unnecessary complexity.

Choose a cantilevered staircase when:

• you want the strongest possible floating effect

• the supporting wall can be designed or reinforced appropriately

• the staircase is being considered early in the construction process

• concealed structural support fits naturally within the project

If those conditions don’t apply, we’d look seriously at a mono stringer or another floating stair system rather than trying to force a true cantilever.

That’s not settling for second best.

A mono stringer can produce a different kind of architectural statement. Instead of pretending the staircase has no structure, it can make a slim structural spine part of the design.

Homebuilding discussions often show this distinction causing confusion. In one example, commenters identified stairs that a homeowner thought were cantilevered as stringer-supported stairs because their supporting structure was clearly visible.

Think About the Railing at the Same Time

Railing systems shouldn’t be treated as decoration added once the stair has been designed.

Their fixing points can affect the treads and underlying structure. Glass railing, for example, can preserve an open appearance beautifully, but the glass and hardware still need somewhere suitable to connect.

Cable, metal and other railing systems create different visual results and connection requirements.

We prefer to make that decision early so the stair, railing and structure work as one assembly rather than becoming three separate problems later.

Do Cantilever Stairs Cost More Than Other Floating Stairs?

They can, but there’s no meaningful universal price difference.

Comparing “cantilever stairs” with “floating stairs” isn’t quite a like-for-like cost comparison because cantilever stairs themselves fall within the floating category.

The more useful comparison is between structural systems.

A straightforward mono stringer might have a relatively predictable steel structure. A true cantilever installation could require concealed steel, reinforcement within the wall and additional work before the finishes go on.

On another project, the existing structure may already be ideal for a wall-supported solution.

Material choices also change the scope considerably. Thick hardwood treads, stone, glass railing and custom steel fabrication all influence the final project cost.

For that reason, we’d be cautious about choosing between floating stairs vs cantilever stairs based on a headline price found online.

First establish what’s actually possible within the building.

Then compare systems based on the complete scope, including the structure, treads, railing, engineering and installation. A cheaper stair component doesn’t always result in a cheaper finished staircase.

A Practical Tip Before Asking for Pricing

Have the following information available where possible:

• floor-to-floor height

• staircase opening dimensions

• architectural drawings or sketches

• photos of the proposed location

• preferred tread material

• preferred railing style

• whether you’re building new or remodeling

You don’t need every detail finalized. Good early information simply helps us identify which stair system is realistic before too much design work heads in the wrong direction.

Are Floating and Cantilevered Stairs Safe?

Properly designed floating stairs and cantilevered staircases can both be safe. The visual style isn’t what determines safety.

The structure, tread dimensions, railing, installation and applicable building codes all need to work together.

For example, the International Residential Code provisions used as the basis for many US residential codes set dimensional requirements for stairs and address openings at open risers. The 2021 IRC states that open-riser openings more than 30 inches above the floor or grade below must prevent a 4-inch-diameter sphere from passing through. It also establishes a maximum residential riser height of 7¾ inches and a minimum tread depth of 10 inches.

Requirements aren’t identical everywhere, though. States and local jurisdictions can adopt and amend different editions of model building codes. Even within current ICC material, residential and other occupancy classifications can have different stair requirements.

That’s why we don’t recommend copying dimensions from somebody else’s project or relying solely on an online stair photo.

Safety also extends beyond passing an inspection.

Open stair designs can make some homeowners nervous when young children, older relatives or pets use the staircase regularly. Homeowner discussions about open floating stairs frequently raise those concerns after people move into a property, particularly when large openings were inherited from an older installation.

If this describes your household, bring it up during the design stage. A more protective railing system or a slightly different stair configuration can often preserve the modern appearance without ignoring how the staircase will actually be used every day.

Floating or Cantilever: Which Should You Choose?

The main difference between floating stairs vs cantilever stairs isn’t how dramatic they look in a photograph. It’s what you can’t see.

A true cantilever relies heavily on its concealed structural support. Other floating systems may use a visible or partially concealed steel beam instead, giving you many of the same benefits of an open staircase without placing the same demands on the wall.

Neither approach is automatically better.

If your home can accommodate a cantilevered system and you want the cleanest possible visual effect, it can create a spectacular architectural feature. Where the building calls for a different solution, a well-designed mono stringer or another floating configuration can be every bit as intentional.

Our approach is to start with the architecture, structure and way you want the staircase to feel within the room. From there, we can develop a system that creates the floating appearance you want without treating the hidden engineering as an afterthought.

If you’re considering floating or cantilevered stairs for your project, speak with our team early. With plans, measurements or even initial design ideas, we can help determine which structural approach best suits the space and turn the concept into a staircase that feels considered from every angle.