Curved Stairs
ROLLED-STRINGER STAIRCASE · DOUBLE CURVED · HELICAL
the sweep that sets the tone for the whole home, visible from the foyer entry
Sweep flights are feature stairs. The curve is visible from the foyer entry, afternoon light playing along the arc — the sweep that sets the tone for the whole home. Every curve runs off a rolled-steel stringer, which means the geometry is unique to your foyer and cannot be picked from a catalog. Common requests include a single-sweep flight in a villa foyer, a double-curve pair flanking an entry hall, or a tight-radius stair for an entryway corner. Send the floor opening and finished-floor-to-finished-floor rise. We draw the radius from there.
VILLA & COUNTRY HOME
Private estates and country residences where the staircase is the moment you see when you walk through the front door. The signature build here is a double curved staircase — twin sweeping flights meeting at a center landing. The alternative is a luxury modern sweep stair with a single arc. Pair it with a floating radius flight tread detail where the stringer disappears behind the wall. Balusters land in stainless, glass, or wrought iron; arc tread nosings wrapped in hardwood or stone to your finish schedule.
NEW HOME BUILD
Designed in from the architect's first plan set. The foyer width fixes the radius, the floor opening fixes the rise, and the sweep is drawn in before the slab is poured. This is where rolled-stringer flight foyer, entryway sweep stair, and radius foyer railing requests live. Send a CAD floor plan; we match the radius to the foyer geometry, and treads ship in hardwood with matching rolled-stringer banister and balusters. Radius staircase plans for permit-ready drawing sets are part of the same package.
APARTMENT & CONDO
Boutique condo entrance halls, townhouse foyers, and apartment entry landings where a small-radius sweep softens the corner. A small radius staircase is drawn to the entry-floor opening. The rolled stringer ships in install-order sections that pass through a standard service-door opening for delivery. Treads in hardwood for the warm interior look, balustrade in glass or stainless for the modern read.
BATCH RENOVATION & MULTI-UNIT DEVELOPMENT
When the same radius flight repeats across multi-unit developments or batch foyer renovations — same sweep, same radius, same tread profile, repeated unit to unit. We work from the developer's stamped architectural plans and return a sweep-stair shop drawing for sign-off. We ship the rolled stringer as a repeat package so the same template lands cleanly in each entry hall.
Curved Staircase — Range Overview
| Product | Material | Style | Best For |
|---|---|---|---|
| Single-Curve Staircase | Rolled-steel stringer + hardwood treads | Sweeping single radius | Villa foyers, new-home entry halls, condo lobbies |
| Double-Curve Staircase | Twin rolled stringers + custom-radius treads | Mirrored twin sweep | Villa centerpieces, grand entry halls |
| Floating Curved Stair | Concealed rolled stringer + cantilever treads | Open-riser sweep, hidden support | Modern foyers, gallery spaces |
| Small Curved Staircase | Rolled-steel stringer + hardwood or stone treads | Tight-radius sweep | Townhouse entries, compact apartment foyers |
| Modern Curved Staircase | Rolled steel + glass balustrade panels | Minimalist, frameless rail | Contemporary residences, modern villa interiors |
About Our Curved Staircase Range
A curved staircase is an interior flight built on a rolled-steel stringer that bends to a single radius. Every curve is unique to the foyer it lands in and cannot be picked from a catalog. Radius flights are an interior architecture decision more than a fixture order. The brief usually comes from a villa or new-home owner planning the foyer they want to live with. The architect, designer, or contractor coordinates the build. Owners replace a straight run with a sweep during renovation. Architects lay out a new-build entry hall. Condo owners specify a contemporary rolled-radius stair in a unit retrofit. Owner-builders pull a rolled-stringer flight plan for permit — all running through the same intake. Every quote begins with the floor opening, the finished-floor-to-finished-floor rise, and the radius preference. Sometimes the radius is fixed by structure (a column line, a wall pocket), and sometimes it is the designer's call. We draw both options and you pick. Common requests also include a fully detailed design package, a CAD-ready radius drawing, and a permit-ready stair plan. All lead to the same shop-drawing review process.
The material logic for an interior radius flight is different from an exterior one. Stringers run in rolled mild steel, bent to the radius on a section roller and welded. From there they go powder-coated for an exposed industrial look or clad in hardwood for a traditional foyer. Curved stair treads are typically hardwood (oak, walnut, ash) with a profile that follows the arc. Stone-cap and steel-plate treads are also available for commercial loading. Balusters and the radius stringer railing can run in stainless steel cable, frameless glass, traditional wrought iron, or hardwood. All coordinate with the rest of the interior. We also stock radius treads as separate replacement components when a renovator needs to refresh an existing rolled-stringer flight without rebuilding the stringer.
Designed in our Guangdong studio and crafted in our 4,500 m² workshop. The rolled stringer is stood up on the workshop floor for trial assembly, then disassembled and crated in install sequence. DBM produces, trial-assembles, and crates the staircase. On-site installation and local code stamping typically run through your contractor and licensed engineer.
Keep reading: Browse the full Staircase Collection → · Compare Straight Staircase → · Compare Spiral Staircase →
Spec Snapshot — Curved Staircase
A plain-language summary of what owners typically choose before sending a foyer plan. Final dimensions and code references come from the shop drawings.
How to Spec a Curved Staircase for Your Project
The owner view: what to measure, what to send, and how to settle the radius and material questions before we draw.
- Measure the floor opening. The width and depth of the upper-floor opening that the stair will land into. If you can, send the dimensions in plan view.
- Measure the rise. Finished-floor-to-finished-floor — from the foyer floor up to the top landing surface.
- Mark the fixed points. Columns, wall pockets, fireplace breasts — anything the radius has to clear. A photo of the foyer with these marked is enough.
- Decide the look. Single sweep (one arc), double sweep (mirrored twin curves to a centre landing), or floating curve (stringer hidden in the wall). Both options drawn if you are undecided.
- Choose tread and railing material. Hardwood treads + stainless cable for a modern villa; hardwood treads + wrought iron for a traditional foyer; hardwood treads + frameless glass for a minimalist sweep.
- Send it through. We return shop drawings showing the radius, tread arc, baluster spacing, headroom envelope, and the code-reference list. Your local engineer signs off from there.
Frequently Asked Questions
Answers below cover the radius geometry, freight, and code-reference questions owners and architects ask before a rolled-stringer project. If yours is not here, send the foyer plan through Request a Drawing Review.
Can you match a specific interior radius — for example, a curve that wraps an existing column?
Yes. Send the column centerline and the wall offset on a plan view, plus the rise. We draw the stringer radius to clear the column. A layout drawing comes back showing the tread arc, baluster spacing, and headroom envelope before fabrication starts.
How do you measure for a sweep stair if the floor isn't built yet?
From the architectural drawings. We need the floor opening dimensions on the upper level, finished-floor-to-finished-floor rise, and any fixed wall or column points the stair has to clear. If you can also send a section view, the headroom check is faster.
Can you supply just the radius treads as replacement parts?
Yes — we cut sweep stair treads as a standalone supply when an existing stair stringer is staying. Send dimensioned templates of the existing treads (or send one old tread back as a sample) and we copy the profile in hardwood or stone-cap.
Can your drawings be stamped by a licensed engineer in my country?
Yes. Shop drawings reference the code families for the United States, Australia, and Canada (IRC, IBC, AS 1657, AS 1288, NCC, CSA). Final stamping is handled by a licensed engineer in your jurisdiction through our partner network or yours.
How is a one-piece rolled stringer packed for ocean freight?
The rolled stringer ships in a custom-built timber crate sized to the radius. Treads, balusters, and the railing system bundle in install sequence, photo-documented before sealing. A PDF assembly manual ships with every kit.
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