Staircase
Custom staircases, drawn and built in our own factorySpiral · Curved · Straight · Outdoor
Custom staircases for villa foyers, new-home centerpieces, apartment renovations and batch projects — drawn and built in Guangdong, shipped worldwide.
Double Building (DBM) is a staircase factory in Foshan, Guangdong. Send a floor plan, a photo of the opening, or a sketch. We return shop drawings for your approval, build the stair in our own workshop, trial-assemble it, and crate it in install order for your local contractor. This page gathers the four staircase families we make: choose the one that fits your space, then open its page.
Four staircase families, one factory
Spiral, curved, straight and outdoor cover most homes, from a loft to a grand foyer to a pool deck. Each card opens its own page with materials, finishes, factory videos and a form for shop drawings. Our full catalog and client project photos are not public, to protect client privacy — send your brief and we reply with options that fit.
TYPE 01 / SPIRAL
Spiral Stairs
Treads turn around one center column. The smallest footprint, for villa libraries, apartment lofts and deck corners where a straight run will not fit.
- Diameter drawn to your opening
- Wood, metal, outdoor steel or modular aluminum
- Trial-assembled, packed in stack order
TYPE 02 / CURVED
Curved Stairs
One rolled-steel stringer follows a single radius across the foyer, with no center column. The stair becomes the first thing you see from the front door.
- Radius drawn to your foyer
- Single sweep, double sweep or hidden stringer
- Hardwood, stone or steel-plate treads
TYPE 03 / STRAIGHT
Straight Stairs
One straight run, a run with a mid landing, or an L-turn at the landing — on a double stringer, a monostringer or a box stringer.
- Straight or L-shaped with landing
- Marble and stone treads cut in-house
- Steel and stone in one shipment
TYPE 04 / OUTDOOR
Outdoor Stairs
Exterior metal stairs from a deck, terrace or pool garden down to grade, built for rain, salt air and UV.
- Hot-dip galvanized steel, aluminum or marine-grade stainless
- Powder-coat color over zinc where it shows
- Footing detail on the shop drawings
How to choose your staircase type
Most choices come down to space. A spiral fits the tightest circle. A curved stair needs the widest foyer. A straight stair needs length in one line. Outdoor stairs add weather to the brief. The matrix sets the four side by side.
Start from your project, not a catalog
We build for villa owners, new-home builders, apartment owners and developers — and for the architects and contractors who carry the project out.
Villa & Country Home
The foyer often wants a curved sweep, or a straight flight with marble treads. A library or loft often takes a wooden spiral, and the garden takes outdoor steps down to the pool.
New Home Build
The house design often fixes the hall before the stair is chosen. We take the rise, run, radius or diameter from those drawings, so the stair is drawn into the house, not added later.
Apartment & Condo
A loft apartment often takes a spiral, a compact entry a small curved stair, and a split-level a steel stair. Terraces and rooftops take outdoor stairs.
Batch Renovation & Multi-Unit
When the same stair repeats, one drawing repeats from unit to unit. Parts are labelled by unit and floor, so each crate matches its stair.
From drawing review to your site
The same four steps run through every staircase we ship, whether it is one villa centerpiece or a run of repeat units. Drawn in Foshan and built in our own 4,500 m² workshop, every stair is trial-assembled before it is crated.
Drawing Review
Send CAD, SketchUp, a hand sketch or a photo of the opening. We return shop drawings, and nothing is fabricated until you approve them.
Fabrication
Steel is cut, welded and finished in our own 4,500 m² workshop in Foshan. Stone treads are cut in-house.
Trial Assembly
The full stair is stood up on our workshop floor and checked, so the fit is confirmed here before the crate leaves.
Export Crating
Parts are labelled and crated in install order for ocean freight, with a PDF assembly manual for your installer.
We build the stair. Your local team puts it in.
We are a manufacturer and exporter. Knowing where our work ends keeps the schedule honest for everyone on your project.
- Shop drawings to your measurements
- Fabrication in our own workshop
- Trial assembly before packing
- Labelled export crating and shipping
- Site measurements
- Engineer review and sign-off where required
- Permits
- Installation by your local contractor
Drawings list the codes your local engineer checks
Tread depth, riser height, headroom and handrail height are set by the building code where you build. Our shop drawings list the relevant code family. A licensed engineer in your country reviews and signs off the drawings; we do not.
U.S. Residential
The International Residential Code covers one- and two-family homes: tread depth, riser height, headroom and handrails.
U.S. Commercial & Multi-Family
The International Building Code covers apartments and multi-family buildings, and is often stricter than the residential code.
Australian Standard
Fixed platforms, walkways, stairways and ladders — often referenced for access and external stairs in Australia.
National Construction Code
Australia’s building code, the framework for stairs in homes and multi-unit buildings.
Glass in Buildings
Referenced when the railing uses glass infill on Australian projects.
Canadian Standards
Referenced on Canadian projects alongside the local building code.
Five things we need to start drawing
Rise
Finished floor to finished floor, or deck height to grade for an outdoor stair.
Space
The clear circle for a spiral, the foyer width for a curved stair, the hall length for a straight run.
Photo or drawing
A phone photo of the opening is enough. CAD, SketchUp or a hand sketch is even better.
Finish ideas
Tread material, railing style and color — a reference photo helps.
Ship-to
Country, or US state, so we can plan the crate and the shipping route.
Questions before you choose
How do I decide between spiral and curved?
A spiral turns around a center column inside a small circle. A curved stair has no column and sweeps across a wider foyer on a rolled stringer. A spiral saves floor space; a curved stair needs more of it and becomes the centerpiece. Code rules for spiral stairs differ by jurisdiction, so your local engineer confirms whether a spiral can serve as the main stair. Send your floor plan and we can sketch both options.
Can I combine two staircase types in one project?
Yes. A common pattern is a curved feature stair from the ground floor to the first floor, then a straight or spiral stair above. Each flight gets its own drawings. We coordinate the floor junctions and label the crates so each flight stays together.
What is the typical lead time for a custom stair?
It depends on the stair type, the finish and the shipping route. Send your floor plan, finish and destination, and we reply with a schedule for drawings, fabrication, trial assembly and shipping before the order is confirmed.
Do you ship to my country?
Most likely. Our 800+ delivered projects span 60+ countries. Trade terms are agreed when you order, based on your destination port and freight forwarder. For less common routes we confirm the shipping options before quoting.
Is there a minimum order quantity?
One staircase is enough. Every stair is made to order, not taken from stock. For batch renovations and multi-unit projects, one drawing repeats from unit to unit; send the unit count and we quote the batch.
Do you install on site?
No. We draw, build, trial-assemble and ship. Your local contractor installs from the labelled crates, using the PDF assembly manual.
Do you stamp the drawings for permit?
No. A licensed engineer in your country reviews and signs off the drawings where required. Our drawings list the code families for the United States, Australia and Canada.
Send a drawing. Get shop drawings before the quote is locked.
A CAD file, a SketchUp model, a hand sketch or a reference photo all work. We check what can be built before the first invoice.
Shop drawings · factory quote
Tell us about your stair
