Salaam. I am a 28 year old married Bangladehi Muslim girl. I have completed education till masters and am working. I would describe myself as an independent minded girl but I have the intention of following Islamic rulings.

I have been living with mother-in-law and younger sister-in-law (who will get married soon inshaallah) since my marriage for last 3.5 years. My husband requested for this and I agreed with good intention. My in-laws are very good people, care for me, give me my own space and never misbehave with me. My husband is very loving and caring and I love him with all my heart. We haven't taken a baby yet.

But over the time, I am feeling the need of my separate territory. Even with good relationship, sometimes its hard to match mentality with other people. I do not mean that I want to live far away from my in-laws but I would like to live next door to my mother-in-law. We would meet and greet and care for each other everyday but that way I would be the lady of my household and she will be of her's.

My husband is not willing to live even next door to his mother. I know in Islam I should keep my husband happy but I am also an educated girl of this century and I have my own optinions. Do I not have the Islamic right to demand separate lodging if I ever feel that I definitely do not want to live and raise my children (inshaAllah) in the same house with my mother- in- law anymore? And would my husband be labeled as a bad son if he takes care of his mother by living next door to her?

I am neither Muslim nor an expert on Islam, but want to make a practical suggestion, since I have a feeling that this question doesn't have an exact answer under Islamic rules.
Your husband's mother has lost her husband (it sounds like), so it makes sense that your husband wants to take care of her, and there may be financial considerations to think about too. Will his sister need a dowry? Who will pay for her wedding? Where will they live?
Maybe after she is married, and depending on whether they will live with all of you, you and your husband can start talking again about living in your own home. She could take over as the younger one who helps take care of her mother. But your husband may feel that as the 'man of the house' he needs to stay.