Straight Stairs
Custom metal staircase, fabricated in our own factoryStraight · With landing · L-shaped · U-shaped
A straight steel staircase, a straight staircase with landing, or an L-shaped staircase with landing — welded, finished and trial-assembled in Foshan, Guangdong, for your home.
Double Building (DBM) is a staircase factory, not a stock catalog: we build custom steel stairs to your floor-to-floor rise and the length your hall can give the stair. After approval we fabricate the double stringer frame, prepare the treads, stand the full stair on our workshop floor, and send it in one shipment. Your local contractor installs.
Shop drawings · factory quote
Send rise, run and stair shape. We reply with a drawn stair for approval and a factory quote.
A steel staircase that has already been fitted once
Many owners look for a staircase that arrives ready to fit. Ours is built to your rise and opening, stood up complete in our workshop, then taken apart, labelled and packed in install order — so your contractor assembles a stair that has already been fitted once.
Approval first
Send rise, run and a hall photo. The drawn stair comes back with beam length, tread count and landing position for your approval.
Fabricated in-house
We cut, weld and finish every fabricated metal staircase in our own shop, and cut stone treads in-house.
Trial assembly
The full stair stands on our workshop floor with its treads on, and every tread is checked for square before packing.
One shipment
Steel and treads are packed separately, labelled in install order, and sent together by sea.
Straight, L-shaped or U-shaped — one frame, one factory
Custom straight stairs come in three shapes; pick the one your hall allows. A straight-up run, or a multi-run stair over several floors, uses the same frame and the same factory process.
Straight Staircase with Landing
One climb split into two runs on the same line, with a landing between them. It needs the longest hall.
L-Shaped Staircase with Landing
Turns 90° at the landing and fits a shorter wall. The same double stringer frame carries both runs.
U-Shaped Stairs with Landing
Two runs side by side, turning 180° at a full-width landing — for a stairwell or a compact hall.
Choose the beam first; treads and infill follow
Every custom metal staircase starts with the beam. Two steel beams carry the treads at both edges, so a long run or an L-shaped stair can stop at a solid landing and still carry heavy stone. US stair makers often call these dual stringer or double stringer floating stairs.
Residential stairs, from a loft stair to a foyer centerpiece
Our straight stairs are indoor metal staircases for houses and apartments — owner-led projects carried out by a local contractor or architect.
Villa & Country Home
Villa owners often want the foyer to read as one straight line, or to turn once at a landing. A double stringer staircase with stone treads gives that line weight; for architectural steel stairs in a modern foyer, a center-beam stair with hardwood treads leaves both sides open.
New Home Build
The architect often fixes a straight hall before anyone picks the stair. We take rise and run from the house drawings, so the residential staircase is drawn into the house, not added at the end. Where the layout turns, the same frame becomes an L-shaped or U-shaped stair.
Apartment & Loft
A loft conversion or split-level unit often needs a compact metal staircase: powder-coated where it shows, galvanized in a stairwell, with steel pan treads. If one run cannot cover the rise, we add a landing and a second run.
Batch Renovation & Multi-Unit
When the same straight stair repeats from floor to floor or unit to unit, beam profile and tread count stay identical. We pre-drill the connections and label the treads by floor.
Replace a staircase in the same opening
When a new stair must sit in the hole the old one leaves, send the opening size with the rise. We size the steel frame to that opening, so the new custom straight staircase — or an L-shaped stair where the opening allows — fits the existing floors. We supply the stair; removal, finishing and any other building work stay with your contractor.
Treads, finish and infill
Hermes grey, a grey stone with fine white veining, sits calmly against dark powder-coated steel. Carrara and Calacatta give a white stair with soft or bold veining; Nero Marquina gives a black stair with white veins.
Four steps, every straight stair
Drawn for approval
Beams, landing, tread positions and the tread cut list, set to your rise and run.
Fabrication
Steel welded and powder-coated; stone treads cut in-house.
Trial assembly
The full stair stood on our workshop floor with its treads on, checked, then taken down.
One shipment
Steel and treads packed separately in install order; your local contractor installs.
Straight stairs on our workshop floor
Clips from the Double Building channel: double stringer frames, stone treads and landings, stood up before packing. Tap a clip to play it here.
Before you order a straight stair
Center beam, double stringer or box stringer — which one?
A center beam (monostringer) is one steel beam under the treads; both sides stay open. Double stringer stairs run two steel beams along the tread edges and share the load, which suits long runs, landings and heavy stone treads. A box stringer wraps a closed steel frame in hardwood risers and treads. Read more: Steel Stair Stringers Explained →
Does the stair arrive ready to fit?
It arrives in labelled parts, not as one piece. The full stair was assembled and checked on our workshop floor first, then the steel beams were banded together, fixings packed in a tagged box, and the stone treads crated separately in stair-up order. A PDF assembly manual comes with the package for your installer.
Can you supply stone treads with the steel frame?
Yes. Choose Hermes grey, Carrara, Calacatta, Nero Marquina or travertine. We cut the treads in-house and fit them to your steel frame during trial assembly, so you do not need a separate stone supplier.
Can you replace a staircase in the same opening?
Yes, when the new stair must sit in the hole the old one leaves. Send the opening size with the rise, and we size the frame to that hole. We supply the stair; any other renovation work stays with your contractor.
Do you install, or stamp the permit set?
No to both. We manufacture and export. A licensed engineer where you build stamps the permit set where required, and your local contractor installs. For US projects our drawings reference the IRC and IBC.
Which shape fits my hall?
A straight run needs the most length; a landing splits it into two runs on the same line; an L-shaped stair turns 90° and fits a shorter wall; a U-shaped stair turns 180° in a stairwell. Send the rise and the space and we draw the options. More: Straight vs L-Shaped and U-Shaped Stairs →
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