The Sonar Staircase is an elegant refinement of central string philosophy, featuring two Z-formed strings instead of the traditional single central spine.
This distinctive dual-string configuration creates a more open framework aesthetic whilst maintaining the self-supporting structural integrity that defines Zakuna’s contemporary designs. With hardwood treads resting on top of the dual Z-formed strings, the Sonar Staircase creates a minimalist visual presentation — the supporting structure is visible yet refined, creating architectural interest through engineering honesty. The dual string design provides additional lateral rigidity and allows for a broader range of tread materials and finishes. Available in any RAL colour, stainless steel, Corten steel, or galvanised steel, the Sonar Staircase offers extensive customisation. The slim open framework appeals to contemporary designers seeking a staircase that celebrates its engineering whilst maintaining visual elegance. The Z-formed profile is architecturally distinctive and creates compelling visual rhythm.
The Sonar Staircase represents a sophisticated balance between structural visibility and minimalist aesthetics. The dual Z-formed strings are laser-cut and precision-engineered to exacting tolerances, creating a staircase that is as much about celebrating engineering as it is about spatial functionality.
All Zakuna Sonar Staircases comply fully with UK building regulations and are engineered to the highest standards. The self-supporting structure requires no wall fixings or newel posts, providing maximum flexibility in spatial planning. Hardwood treads are available in a choice of timbers and finishes, sitting neatly on the dual strings. Balustrades can be specified in glass, with spindles or railings, or contemporary alternatives. The Z-formed string profile is available in RAL colours, stainless steel, or Corten steel, allowing extensive finish customisation.
Our design and engineering team provides comprehensive support from initial concept through detailed specification, structural engineering, and installation by our most experienced specialists. Explore our Staircase Showcases to see the Sonar Staircase installed in projects across southern England and London.
