Boni, I don't know if you are interested in using this technique (VIDEO BELOW), but I find this just as easy as using other pre-fab methods like the Archimesh steps, and it will give you perhaps even more control over the look of the model and the UV unwrapping. Anyway, if the Archimesh style is what you want, then as had been mentioned already, the bending needs edge loop segments to work. CTRL+R. Good luck.

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