Metal Spiral Staircases (Custom & Prefab)

Which Metal Is Right for Your Spiral Staircase?

Choose the metal according to where the stair will stand. Powder-coated steel is a starting point for indoor rooms, while hot-dip galvanized steel and aluminum are better choices to explore for exposed decks and coastal conditions. Forged-iron designs bring decorative detail to indoor spaces. Compare your site’s exposure, the look you want, and the available configurations before choosing.

These are general comparisons, not fixed product prices or guarantees for every configuration.

Steel offers a wide choice of colors and tread styles for an indoor stair that fits the room. If the stair will be outdoors, explore our galvanized steel spiral stairs or aluminum spiral stairs and discuss the site’s exposure with our design team.

Hot-dip galvanizing coats steel with zinc to help protect it from corrosion. It is a practical choice when rain and moisture reach the stair, including many open-deck projects.

Aluminum is lighter than steel and does not rust, making it useful where salt air or the weight of the installation matters. Review the finish, connections, and tread choice for the site.

Forged-iron styling puts the emphasis on decorative balusters and traditional detail. Pair it with wood treads or handrails for an indoor staircase that complements the surrounding finishes.

How Much Does a Metal Spiral Staircase Cost?

The cost of a metal spiral staircase depends on its material, diameter, height, tread and railing choices, and whether the design is a standard kit or a custom configuration. Powder-coated steel spiral stairs are often a starting point for indoor projects. Galvanized steel and aluminum address different outdoor conditions, while forged-iron designs add decorative detail.

Tell our designers where the stair will go, your finished floor-to-floor height, and the look you want. Select Get Quick Pricing for a quote based on your configuration.

Indoor vs. Outdoor Metal Spiral Stairs

Indoor metal stairs give you more freedom to choose finishes for the room. Powder-coated steel can provide a clean, modern look, while decorative ironwork and wood accents suit a more traditional space. Explore indoor spiral stairs to compare those styles.

For an exposed deck, start with galvanized steel or aluminum and choose a tread surface suited to rain and drainage. At a beach house, salt air makes the material and finish especially important. Aluminum can also suit rooftop access where stair weight is a design consideration, subject to the roof structure and installation plan. Explore outdoor spiral stairs, then review the full configuration for your site. If you want composite treads on an outdoor metal stair, explore our Paragon + Trex® Spiral Stairs Collection.

Custom vs. Prefab Metal Spiral Stair Kits

A prefab metal spiral staircase is a useful starting point when a standard kit fits the space and intended use. A custom metal spiral staircase gives you more control over dimensions, materials, railing, and finish. Paragon offers both quick-ship stair kits and designs you can explore with Build Your Stair.

Our kits arrive as components for assembly, with instructions and hardware specific to the selected product. With the site prepared, a suitable residential kit can be an afternoon project for a confident installer. Plan separately for any new opening, structural work, anchors, or permits your project requires.

Customizing a stair lets you address an unusual floor-to-floor height or a particular combination of treads, railing, and color. Share your measurements and intended use early so the designer can help you compare available configurations.

Are Metal Spiral Staircases Code Compliant?

A metal spiral staircase can meet the requirements for its intended use when the complete stair and installation are designed accordingly. In some homes, a spiral stair may serve as a primary stair, subject to the locally adopted code and the full building plan. A product photo or diameter alone does not establish compliance.

For reference, the 2021 International Residential Code calls for at least 26 inches of clear width at and below the handrail, at least 6¾ inches of tread depth at the walkline, risers no higher than 9½ inches, and at least 6 feet 6 inches of headroom for spiral stairs. The walkline is measured 12 inches from the inside of the turn. Our standard 5’0″ diameter provides a 26-inch clear walking path, but the full configuration and installation still need review against the code adopted for your project.

Commercial and workplace projects require a separate review of the rules that apply to their use. Share the stair’s location, purpose, finished floor-to-floor height, opening, and landing details with our design and engineering team, and confirm the proposed design with your local building department.

Why Buy Your Metal Spiral Stairs from Paragon?

Paragon has built stairs since 1947 and manufactures them in Collegeville, Pennsylvania. Its in-house design and engineering teams help turn your measurements into a stair for your project, whether you start with a kit or select a more customized design. Paragon has served more than 50,000 customers and offers thousands of design combinations.

Qualifying metal fabrication is backed by a limited lifetime warranty. Paragon ships across the continental United States, and its virtual design consultation can provide a 3D model and pricing for your proposed stair.

Frequently Asked Questions

How much does a metal spiral staircase cost?

Cost depends on diameter, floor-to-floor height, metal, treads, railing, finish, and the stair’s intended use. A compact steel kit and a custom multistory design will have different requirements and prices. Select Get Quick Pricing for a quote based on your measurements and choices.

What is the best metal for an outdoor spiral staircase?

Aluminum and hot-dip galvanized steel are strong starting points for an outdoor spiral stair. Aluminum does not rust like steel and is useful in coastal or weight-sensitive locations. Galvanized steel has a protective zinc coating suited to many open decks. Confirm the finish, treads, and connections for your site’s exposure.

Are metal spiral staircases code compliant?

They can be when the complete stair and installation meet the rules for the intended use. The 2021 IRC’s spiral-stair provisions include a 26-inch minimum clear width, a 6¾-inch minimum tread depth at the walkline, and a 9½-inch maximum riser height. Review the full requirements in Are Metal Spiral Staircases Code Compliant? and confirm the locally adopted code before ordering.

Can I install a metal spiral staircase myself?

Many residential kits are designed for assembly by a capable homeowner with the site prepared. Opening work, anchoring, permits, and structural changes may call for a contractor, and larger or multistory stairs can be more involved. Review the selected kit’s instructions and Paragon’s installation resources before deciding how to install it.

What size opening do I need for a metal spiral staircase?

The finished opening generally needs to be at least 2 inches wider than the stair’s diameter in each direction. For example, Paragon lists a 44-by-44-inch minimum opening for a 3′6″ stair. Diameter also affects walking space and the configuration available for your intended use. Check Paragon’s diameter and opening guide and confirm the measurements for your project.

What is the difference between a prefab and a custom metal spiral staircase?

A prefab kit begins with a set of available components and dimensions, while a custom stair offers more choices for the site and design. Paragon offers quick-ship kits and configurable designs through Build Your Stair. Compare each option using your finished floor-to-floor height, opening, intended use, and preferred materials.

Do you sell metal spiral staircases near me?

Paragon manufactures stairs in Pennsylvania and ships across the continental United States. You can discuss your project with a designer virtually, share measurements and photos, and receive a proposed design with pricing and a 3D model. Start with Get Quick Pricing to find a configuration for your location.

Ready to plan your stair? Share your space and intended use through Get Quick Pricing, or explore the details in Build Your Stair. You can also call Paragon at 1-888-939-3778.