Halil Avcı established Dede-Han Constructing Trade and Limited Company in 1986.Since the company was built,he has had various building works and the works of the company has still been continuing.Dede-Han Company is Turkey’s representative of “Lipro Australia”for illumination and for the subject of telpher telexy-telexy chairlilft, it is the representative of “SBS Australia”

In 1989,Halil Avcı established Or-Han Constructing Trade and Limited Company.Made by this company there are many private house buildings and works of commitment.Or-Han company is the is the only representative of turkey for Belgium-Switzerland about illumination under the name of SYLVIANA and Sport Technology International Apt Advanced Polymer Technology Corporation.

Halil Avcı,is the establisher of In-Tur Constructing Electric Tourism Trade Limited Company.In-Tur company and Halil Avcı are in the activity of generating electric in Adana Değirmendere Hydro Electric Station and Karaman-Ermenek Hydro Electric Station.