As an Istanbul / Turkey based company, NN Group is a firm of Building Envelope and Curtain Wall Consultancy, established by architects who are experts in facade consulting.
Since it was established, it has been providing service to the participants in the industry (building contractors, architects, engineers, application companies etc.) in the light of 15 years of sectoral know-how and work experience its founding partners acquired in the field of building envelope and curtain wall consultancy.
NN Group has a substantial infrastructure regarding the building envelope and curtain wall solutions for free form facade 
(amorph) and complex surfaces together with the latest engineering and drafting software. Custom design and the facade system development businesses are carried out with an innovative and sustainable approach by facade consultant Ph.D. Architect Nejdet ZİYAETTİN himself, who is co-founder of the firm.
The Mission of the Firm; is to create customer oriented, economical, fast and flexible processes in the services rendered in the field of building envelope and curtain wall, without sacrificing quality and esthetics.