United States
+1 347 706 1823

+44 2032 868564

+39 02 990 43444

Middle East

+61 280 055 855


United States New York
UK London
Europa Milan
Middle East Dubai
Australia Sydney

High-end Staircase Manufacturer – Winding stair

High-end Staircase Manufacturer

High-end Staircase Manufacturer – Spiral Staircase, New York, USA

Design by Gensler

High-end staircase manufacturer, metal, marble, wood, glass staircase manufacturer. Luxury spiral, monumental stairs.

General Motors Building, 49th Floor. Spiral glass staircase suspended from ceiling. In collaboration with Gensler, the clients sought a stunning centerpiece for their new office, forty-nine floors above Manhattan’s streets. A glass curved staircase. The design was a challenge. Less support. More details. And suspended a half inch off the floor. We have never seen nor fabricated a staircase more technically difficult to execute.


40,000 pounds hung up to the 50th floor with only 7 rods but seemingly weightless, the staircase hovers a half inch from the floor. Its full support rests from the system above. Spiral staircase of structural glass without base support. Staircase supported by seven steel tie rods fixed to the beams of the fiftieth floor. Realized with twenty steps with a 18 feet long glass bridge.  Technical details for stairs support system suspended and anchored to the ceiling. Custom made accessories in brushed duplex stainless steel, the strongest stainless steel in the world.

Glass is another building material par excellence in architecture and interior design, almost always 9 accompanied by other materials such as wood, steel and metals. Cutting to size, straight and grinding, layering with fabrics, metal nets, colored films, gold leaf, silver leaf, copper leaf, LED lighting. We create curtain walls, glazed fronts, door and window frames, furniture, staircases and railings, canopies, porches, partition walls and much more with the characteristics of uniqueness of the single piece. We are also specialized in structural glass.

Other staircase and parapets works at our Portfolio

From project management, shop drawings, production process to experimenting new materials such as liquid metals, for example, Extravega‘s innovative approach stands out for its relentless and unstoppable research. Materials used and processed in this project was metal (brass, bronze in antiqued and polished finish), glass, wood and liquid metal.  Our work embrace different fields such as: design, art, furniture, architecture. As we want to offer a more custom-made and turnkey service, our offers to designers, architects and general contractor includes several solutions also in the choice of woods: solid wood, veneered, raw panels in different wood and any finish (e.g. waxed, painted or lacquered). worked with cutting edge equipment which allow maximum precision and minimum waste.

Projects range from luxury brand shops, offices and showrooms, exhibition stands, to hotels renovations, buildings and residences.
Extravega collaborates with the design world producing custom-made projects with different technical and production levels of complexity. Executions, which are often complicated and challenging, are always coordinated and carried out with the maximum precision, attention to detail and to the environment. The Customer, who is followed from the design until the installation stage, sees his ideas transformed into reality.

Extravega, an italian producer and construction management company, is synonymous of great flexibility, which allows it to perform on any type of materials. Extravega also guarantees a total respect of deadlines, budgets and the attention of any specific needs of the customer for each project. Ethically beside the Customer, we help Architects to realize their vision and dreams.