A brief Background - we are a family of three (Myself, my Wife and our little son (nearly 2years old)) and are looking forward to relocate to Munich soon. We are as of now living in an apartment in Baden-Württemberg which is 40 Sq.m in size.

During our house search in München, We are always said even a 45 Sq.m house is not big enough for our family. And also a friend of ours had indicated that there might be laws (Gesetz) governing (Germany / Bavaria state alone) that regulates the size of houses each one rents in Munich.

My Question now is, Is there any such law (Gesetz)
1) regulating the size of the house we can rent in München?
2) regulating the minimum number of rooms we need to rent (considering our little son also in mind)
If yes, Could you please let me know what is the size of apartment/ house for our family (reference to the law (Gesetz) would also be greatly helpful) ?

Thanks one and all in advance for your time and help.

As far as I know, 13 sq. meter per person is the legal requirement for getting a visa/residence permit. So in your case it shouldnt be a problem.

On a personal note, 45 sq meter is like living in a pigeon hole.If you earn well, why think only about saving for the future.