Elegance in the villa | Bulgaria

2021, Sofia

On the Black Sea coast in Bulgaria is the imposing new construction of a free-standing villa. The open and bright design of the self-supporting stringer stairs for the interior reflects the vastness of the sea. Steel treads encased in classic oak in a box construction, which are welded in between the stringers, create a uniform and rounded image with the flat steel inner stringer lined with veneer for fall protection. The stringer stairs for indoors look particularly elegant thanks to the rounded all-glass railings on the outer stringer, which is fitted with a stainless steel handrail.

White glass for special transparency

The glass panes of the all-glass railings of the interior stringer stairs are made of white glass. This has a very low iron oxide content, which is why there is no greenish tint to the glass. This detail gives the steel staircase a very delicate appearance and perfectly matches the flair of the villa. The all-glass railings are picked up by a box-type stringer combined as a ceiling frame and concealing the treads and continued on the upper floor to the right and left of the stair head.


Project details

  • 1-run stringer stairs, three-quarter rounded
  • straight-running entry and exit
  • 27 steps, 28 risers
  • 1st step on the left with semi-circular stringer extension
  • flight width 1200 mm

  • parapet-high flat steel inner stringers for fall protection
  • inner stringer 10 - 15 mm thick according to static requirements
  • stringer height approx. 920 mm
  • lining on flat steel inner stringer, classic oak veneer, 20 mm carrier board

  • all-glass railings with white glass in outer stringer
  • attached stainless steel handrail for stringer stairs for inside
  • box stringer concealing the treads at the top and bottom to accommodate the all-glass railings
  • stringer height approx. 300 - 400 mm
  • stringer rounded at the transition to the ceiling frame

  • steel treads made of 5 - 6 mm thick sheet steel edged upwards at the front and rear
  • top cover plate welded in flush
  • tread height according to static requirements approx. 60 mm
  • insulated with mineral wool
  • welded in between the stringers
  • steel treads covered on four sides with classic oak parquet

In addition to manufacturing and various assembly services, we were responsible for the verifiable statics of the stringer stairs for the interior.


A&A Architects, Sofia

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