According to the Turkish Flag Law,a foreign flag can only be hanged within; international meetings, fairs, touristic hostels, next to the Turkish flag. Also it is necessary to note that even a Turkish citizen cannot hangand fly a Turkish flag in his garden. But if you want you can stick any flag to your window in you want, there is no legal procedure for that for Turkish citizens and for foreigners... Following is the legal text in Turkish....

Madde 16 - Milletlerarasi toplantilarda, fuarlarda ve yabanci turistlerin konakladigi yerlerde, yabanci devlet bayraklari, ancak bayrakla birlikte çekilebilir. Bu taktirde 12 nci maddenin birinci fikrasi hükmü uygulanmaz.