请教自己装修过房子的朋友, especially兔宝宝 & c6 K) L" K" B2 Q! f/ ZI purchased a 2 storey house with 2100 sqft, partial fininshed basement(1/4 finished), I want to finish the left 3/4 basement plus a full bathroom and a small kichen, do I need some permission? How much I have to pay?2 n+ j9 T0 u" ? z