STOA is a brand name and a group of companies, founded in 1990, specializing in the engineering and installation of total facade solutions – rainscreen claddings; curtain walls; photovoltaic and sun shading structures; architectural metal works for commercial, administrative, residential and other building types in a variety of building materials.

The company has been involved in prestigious projects in Europe, Russia and the Middle East.

STOA has been a registered and certified member of the Bulgarian Construction Chamber since 2007 and of the Natural Stone Institute, USA since 2012.

Striving to optimize their work and respond to the challenges the construction industry is facing STOA team conceived the idea of a universal modular system for the construction of varied building applications and developed the BILDA technology.