The most popular combination in Continox's portfolio — and the most requested by homeowners and architects across the UK. A single structural steel spine, powder-coated in matt black, with cantilevered solid oak treads and a frameless glass balustrade on each side. The result is a staircase that reads as three distinct materials in perfect counterpoint: the warmth of oak, the transparency of glass, and the precision of black steel.

The central spine configuration allows each tread to cantilever freely, creating the floating appearance that defines contemporary staircase design. The frameless glass panels — 17.5mm toughened & laminated — sit in a recessed black base channel, with no visible posts or rails to interrupt the clean vertical run of the staircase.

Black Central Spine — U-Shape, Oak Treads

Black Central Spine — Y-Shape Configuration

For a lighter, more open feel than the central spine, the floating staircase uses wall-fixed steel stringers or a single wall-mounted support system — with each tread cantilevered from the stringer. Powder-coated in matt or satin black, with a frameless glass balustrade on the open side, this configuration maximises light flow through the stairwell while maintaining the sharp black aesthetic.

Floating staircases with black frames work particularly well in narrow hallways and stairwells — the absence of a central spine keeps the space feeling open from every angle, while the black finish gives the staircase presence without visual weight.

Black Floating Staircase — Glass Balustrade

Open Plan — Black Frame & Frameless Glass

For interiors that fully commit to the industrial-contemporary palette — exposed concrete, dark walls, black window frames — an all-black staircase makes the strongest possible statement. Black powder-coated steel spine, black steel plate treads (with a fine surface texture for grip and visual interest) and a black framed glass balustrade or black flat-bar infill.

Steel plate treads in a dark finish age exceptionally well — the powder coat on a flat-bar or plate surface is far more durable than on curved elements, and the aesthetic only deepens with time. This is the specification most frequently chosen by architects working on high-specification residential projects and boutique commercial interiors.

All-black steel plate staircase by Continox — central spine, flat plate treads, powder-coated RAL 9005.

Where oak creates a light, Scandinavian contrast with black steel, walnut creates something richer and more dramatic. The deep, chocolate-brown grain of American or European walnut against matt black steel produces a combination that reads as genuinely luxurious — particularly in open-plan spaces with high ceilings where the staircase is visible from multiple levels.

Walnut treads are typically specified in 40mm solid boards — finished with a hard-wax oil for natural protection and a low-sheen surface that emphasises the grain. A walnut timber handrail capping over a black steel core rail completes the specification, creating material consistency from tread to handrail.

Black Steel + Walnut Treads + LED

Black Steel + Timber — Warm Contemporary

LED lighting transforms a black staircase after dark — and the combination of black steel and concealed LED strip lights creates one of the most dramatic interior design effects available in a domestic setting. Recessed LED strips under each tread cast a soft upward glow that outlines each step against the dark steel framework. In a darkened room, the effect is architectural and highly distinctive.

Continox integrates LED lighting directly into the staircase structure during fabrication — not as a retrofit addition. Channels are built into the tread support brackets, and the LED strip runs continuously beneath each tread at the same depth and angle throughout the flight. The result is a consistent, even light line with no hot spots or visible fittings.

Black staircase with factory-integrated LED tread lighting by Continox — central spine, oak treads, warm white LED strip.

Black framed glass balustrades are not limited to staircases — landing balustrades, mezzanine edges and open-plan floor voids are all common applications. A black post-and-rail frame with toughened glass panels creates a consistent design language throughout the interior, tying together staircase, landing and upper floor in a single coherent material palette.

For landing balustrades, Continox specifies a minimum balustrade height of 1100mm for upper-floor positions (as required by Approved Document K) and engineers the system to resist the 0.74 kN/m horizontal load requirement of BS 6180 for residential applications. The black powder coat finish is specified on mild steel components — posts, rails and base plates — with the glass panels in standard clear toughened or toughened & laminated depending on the application.

Black Post Glass Balustrade — Landing Application

Black Frame Glass Balustrade — Residential

Black powder coat over hot-dip galvanising — the duplex system — is the premium exterior finish specification for exposed steel structures. It combines the long-term corrosion protection of galvanising with the aesthetic control of powder coat, producing a finish that maintains its appearance in exposed UK conditions for 20–30 years without significant deterioration.

For contemporary residential properties — particularly new builds with zinc, timber or dark cladding systems — a black external staircase or balcony railing creates a strong architectural accent that ties the exterior metalwork together. For commercial and mixed-use developments, the black duplex finish provides a premium alternative to standard galvanised or silver powder-coated metalwork.

Black powder-coated external staircase by Continox — duplex finish (galvanised + powder coat), commercial installation.