Stairs · Collection

Stairs that float.

Sculptural steel staircases. Floating treads, spiral forms and fine steel balustrades, engineered to disappear into the architecture. We make the steel structure and balustrade; timber treads are fitted by your builder.

Floating timber and steel staircase with under-tread lighting
Mt Pleasant House
Floating timber & steel · Christchurch
Floating circular staircase inside a surround of thin olive-green flat-bar steel, a recent ARC project in Mt Pleasant, Christchurch Floating oak treads with olive-green steel risers, Mt Pleasant, Christchurch

Floating Circular Staircase

A recent project in Mt Pleasant, Christchurch: floating oak treads curving up inside a strong structural surround of thin olive-green flat-bar steel.

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Floating oak-tread staircase with a fine white steel-rod balustrade, a recent ARC project in Cass Bay, Christchurch

Cass Bay, Christchurch

A recent project: floating timber treads on a white steel structure, with a fine steel-rod balustrade to the open side.

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Floating timber treads on a steel structure with under-tread lighting and a fine steel-rod balustrade

Floating Treads

A welded steel structure with under-tread lighting and a fine steel-rod balustrade to the open side, ready for your builder's timber treads.

Sculptural helical steel staircase curving through a double-height void

Spiral & Helical

A continuous painted-steel form turned tight to the plan, ready for timber treads that follow the curve.

Timber treads cantilevered off a single central steel box-section spine with an intermittent support post and rod balustrade

Exposed Steel Spine

A single central steel spine with intermittent box-section support, ready for timber treads. The engineering expressed, not hidden.

Floating timber treads beside a full-height fine steel-rod balustrade screen in a double-height space

Fine Balustrades

Floor-to-ceiling steel rods drawn to a minimal sightline, a screen that guards the void and filters the light.

Bespoke steel staircases, engineered to the NZ Building Code

We design and build bespoke steel staircases, floating treads, spiral and helical, and single-spine stairs, with fine steel-rod balustrades. We supply the steel structure and balustrade only; timber treads are supplied and fitted by your builder. Every stair is engineered to the New Zealand Building Code (including F4 barrier requirements) and made to order in Christchurch for homes across Canterbury, Queenstown, Wānaka and Central Otago.

What types of steel staircase do you make?

Floating cantilevered treads, spiral and helical stairs, and single-spine (mono-stringer) staircases, with fine steel-rod balustrades. We make the steel structure and balustrade; timber treads are supplied and installed by your builder.

Are your staircases code-compliant?

Yes. Every stair is engineered to the NZ Building Code, including F4 fall-protection and barrier requirements, with engineering sign-off from Bromley Steel.

Do you install outside Christchurch?

We install throughout Canterbury. Beyond Canterbury we make and deliver across the South Island, and work with you to coordinate a smooth install with your builder or a local installer.

Engineered by Bromley Steel

Three decades of structural steel, behind every weld.

ARC is the design studio of Bromley Steel. So every piece is backed by a commercial fabrication shop, certified welders and engineering sign-off. Beauty you can specify with confidence.