Wife wants her own space

Before my marriage, my in laws seperated a section of their house for me. It is a complete seperate house, with my own kitchen etc. However, when I just got married I used to cook with my mother in law because my husband had just started working and we didn't have a fridge/freezer ect. Now it is over one year and I have everything I need, but my husband refuses to allow me to cook on my own. I have a good relationship with my mother in law الحمد الله but I feel I need my own space. He says that I'm just being difficult and since I don't have any major problems with her its un-necessary. Please advise. Is it wrong of me to want my own space?