Floating Straight Staircase

Open-Riser Drama. Structural Precision.

Single mono-stringer design: structural steel spine hidden inside wall cavity
Each tread cantilevered to carry 200 kg point load
Tread materials: solid timber, porcelain, marble, glass or composite
Open-riser design maximises light penetration to lower floor
Compatible with any railing type: glass, cable, rod or no railing
Custom straight, quarter-turn (L-shape) or half-turn (U-shape) configurations

Overview

Our mono-stringer floating staircase creates the illusion that each tread is suspended in mid-air. Achieved through a single-spine steel stringer — precision-welded and concealed within the wall — paired with cantilevered tread brackets that carry 200 kg per tread.

Technical Specifications

Specification	Value
Stringer Type	Single mono-stringer (wall-mounted) or dual side stringers
Stringer Section	200×100 RHS (rectangular hollow section), 8 mm wall minimum
Tread Width	800 mm – 1,500 mm
Tread Depth	240 mm – 300 mm
Riser Height	150 mm – 220 mm (open riser standard)
Max Unsupported Span	Up to 5,000 mm floor-to-floor (structural calc provided)
Tread Point Load	200 kg per tread (residential); 400 kg commercial on request
Tread Materials	Solid hardwood / Porcelain / Marble / Tempered glass / LVL
Stringer Finish	Black powder coat / Brushed SS 316 / Custom RAL
Handrail Height	900 mm – 1,050 mm (adjustable to local code)
MOQ	1 flight
Lead Time	4–6 weeks (custom timber treads add 1–2 weeks)

Available Configurations

Straight Flight

Single run, single stringer. Most common configuration. Ideal for open-plan interiors where the staircase is a design feature visible from the living area.

L-Shape (Quarter Turn)

Mono-stringer with a 90° weld joint. Balances architectural drama with a compact plan footprint. Suitable for corner floor openings.

U-Shape (Half Turn)

180° turn with a mid-landing platform. Maximises vertical travel efficiency in narrow floor plans. Platform can be cantilevered or column-supported.

Frequently Asked Questions

How is the stringer attached to the wall and floor?

The mono-stringer is welded to a base plate that bolts to the structural floor slab (M20 chemical anchors minimum). We provide an anchor bolt layout drawing and torque specifications for your installer or structural engineer.

What wall structure is required to support a floating staircase?

The wall must be structural — concrete, masonry, or steel-framed (min. 150×90 RHS or equivalent). Lightweight drywall partitions are not suitable without additional structural backing.

Can I use natural stone or marble treads on a floating staircase?

Yes. We pre-drill the steel tread plate and provide stainless steel threaded rods that mechanically fix the stone to the bracket. Stone treads require a minimum 30 mm thickness.

Do floating staircases require engineering approval?

In most jurisdictions (US, UK, AU), any structural staircase requires building permit approval which includes engineering sign-off. We provide full structural calculations stamped by our Changzhou-based structural engineer.

Typical Applications

▸Contemporary residential homes and villas
▸High-end apartment penthouses
▸Boutique hotel lobbies and feature corridors
▸Architecture studio and design agency offices
▸Luxury retail showrooms
▸High-end restaurant mezzanine levels

Ready to specify?

Send drawings, dimensions, material preference and destination country for quotation review.

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