Indoor Spiral Staircases
A Staircase That Earns Its Place in the Room.
We design and builds custom indoor spiral staircases that do exactly what a well-made object should: function without compromise and look like they were always meant to be there. Every kit is configured to your space, fabricated in Broomall, Pennsylvania, and engineered to meet code.
100%
Satisfied Customers
55%
Years in Business
50
States Served
GET A FREE QUOTE.
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%
Satisfied Customers
%
Years in Business
States Served
Meets All Building Codes
Ships Fast
Weekend DIY Installation
Made in the USA (need icon)
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Our INDOOR Collections
Designed with Character in Mind
Our indoor spiral staircase kits come in metal, oak, and specialty configurations – each one built to order and customizable across diameter, height, direction, tread material, and finish. Whether you’re replacing an existing stair, finishing a loft, or designing a space from scratch, we’ll configure a kit that fits your opening and your aesthetic.
Most Popular
The Ideal Home
- ✓Our most popular indoor metal stair
- ✓Clean lines that work in most interiors
- ✓Available in powder coat finishes
- ✓Wood tread covers available in 7 species
Versatile
The Twister
- ✓Distinctive design with an open-riser aesthetic
- ✓Great for tight spaces
- ✓Code-compliant and Non-Code configurations
- ✓Ideal for loft access and secondary stair applications
Distinct
The Statement
- ✓An indoor series for design-forward spaces
- ✓Bold balusters and refined detailing
- ✓Wood tread options in various finishes
- ✓For homeowners who want a staircase that holds the room
★★★★★
4.9
Customer Rating
Since 1931
90+ Years Engineering Indoor Staircases
The Iron Shop has been designing, fabricating, and finishing spiral staircases from a single facility in Broomall, Pennsylvania since 1931. Four generations of the Cohen family have run this operation – and every step of the process, from design and engineering to machining, welding, finishing, and shipping, still happens under one roof.
That’s not a positioning statement. It’s just how we’ve always worked.
90+ Years in Business
Engineered for rain, snow, UV, and coastal salt air
100,000+ Staircases Installed
Inside-out corrosion protection that lasts decades
125 Expert Craftspeople
Meets IBC and IRC exterior staircase requirements
1 Facility. Every Step.
Pre-cut, pre-drilled kits with step-by-step guides
Customer Guide
FIND THE RIGHT INDOOR STAIRCASE
Feature
Galvanized Steel
Aluminum
Trex® Composite
Rust / Corrosion Resistance
Excellent (hot-dip galv.)
Superior (naturally rust-proof)
Excellent (galv. + composite)
Weight
Heavy-duty
Lightweight (50% lighter)
Medium
Tread Material
Steel grating / plate
Aluminum grating
Trex® composite boards
Maintenance Required
Minimal (inspect coating)
None
None
Coastal / Salt Air Rated
✓
✓✓ (best choice)
✓
Powder-Coat Colors
20+
20+
20+ (+ Trex® palette)
Diameters Available
42" – 72"
42" – 60"
42" – 72"
Typical Lead Time
3–5 weeks
3–5 weeks
4–6 weeks
Best For
Decks, pools, gardens
Rooftops, elevated decks
Matching Trex® deck systems
How It Works
FROM QUOTE TO INSTALLATION
01
Free Consultation
Speak with a staircase expert who can walk you through measurements, materials, and code requirements – no pressure, just answers.
02
Custom Design
We configure your stair to your exact specs: diameter, height, direction of rotation, tread material, and finish.
03
Precision Manufacturing
Your staircase is fabricated in our Broomall, PA facility by our team of 125 craftspeople and shipped directly to you.
04
Simple Installation
Every kit includes all components and hardware. Most two-person crews can complete installation in a single day with basic hand tools.
Perfect For
ANY INDOOR APPLICATION
Loft Access
Connect upper levels without committing to a full staircase footprint
Open Floor Plans
Add vertical access without walling off your space
Renovations
Replace an existing stair or open a new level entirely
New Construction
Specify early, install during rough-in or finish phase
Library & Mezzanine
Elegant access to elevated shelving or working mezzanines
Multi-Family Friendly
Code-compliant configurations for duplex and multi-unit builds
Installation Gallery
REAL INDOOR INSTALLATIONS
Arndt_fullspiral_White
Caption Caption Caption Caption
Exterior Diamond
Multiline
Wood Handrail
Exterior Mill Aluminum Diamond
5’0 Oil Rubbed Bronze Multiline
Hear first hand
WHAT OUR CUSTOMERS SAY
Featured Review
★★★★★
“We installed the galvanized steel spiral on our deck two years ago. It’s been through two brutal New England winters and looks exactly the same as the day we put it in. The installation took us one Saturday — my neighbor couldn’t believe we did it ourselves.”
Robert M.
Concord, NH
Galvanized Steel — Deck Access
★★★★★
“The aluminum staircase for our rooftop terrace was the perfect solution. Lightweight, rust-proof, and it looks incredible. The Iron Shop team walked us through every measurement and the permit documentation was included. Couldn’t be happier.”
Sandra & Tom K.
Miami Beach, FL
Aluminum Series — Rooftop Terrace
★★★★★
“As a contractor I’ve installed dozens of these. The Trex® composite series is my go-to recommendation for clients who already have a Trex® deck. Zero maintenance, matches perfectly, and the kits go together fast. The Iron Shop’s support team is top notch.”
Dave P.
General Contractor, Austin, TX
Trex Composite — Pool Surround
★★★★★
“Ordering spiral staircases over the internet from a Pennsylvania supplier (we are in Cincinnati, Ohio) was a bit daunting. And, indeed, they cost significantly more than offered at Home Depot or Lowes. Steve was our sales rep and he was very responsive. ”
Sean Michaels
Lewes, Delaware
Aluminum Series — Personal Beach
Common Questions
INDOOR STAIRCASE FAQ
Have more questions?
Call a spiral stair expert at 1-800-523-7427.
Mon–Fri 8am–8pm | Sat 8am–12pm EST.
What's the difference between Code and Non-Code stairs?
Code-compliant stairs meet IBC and IRC requirements for primary-use staircases – including spindle spacing of less than 4 inches between verticals and specific tread dimensions. Non-Code stairs are typically used for secondary access (lofts, attics, storage areas) where building code does not apply. Your design consultant can help determine which is right for your project and local requirements.
What measurements do I need before I order?
Two critical measurements: your finished floor-to-floor height, and your well opening size. The finished well opening must be at least 2″ larger than the stair diameter overall. If you haven’t cut your opening yet, your consultant can walk you through how to factor in subflooring and finished floor thickness.
How long does installation take?
Most two-person crews can install a standard metal kit in about one full day. Oak and Code metal kits typically take two days. You’ll need a ladder, drill, level, and basic hand tools – no specialty equipment required.
Can I get wood treads on a metal staircase?
Yes! The Iron Shop offers tread covers in 7 wood species for interior stairs: American Cherry, Hickory, Mahogany, Maple, Red Oak, Walnut, and White Oak. Wood tread covers are installed over the metal tread base and are one of the most popular ways to customize the look of a metal spiral stair for interior use.
GET A FREE QUOTE.
Share a few details about your project and one of our staircase experts will follow up – usually within one business day. We’ll help you nail down the measurements, work through your options, and make sure the stair you order is the right one for the space.
- ✓Free consultation with a staircase expert.
- ✓No pressure. No obligation.
- ✓Ships directly from our Broomall, PA facility.
- ✓90+ years of engineering behind every kit.
We respect your privacy. Your information is never sold or shared.
Pay over time with AffirmAs low as 0% APR — Subject to credit check