请教自己装修过房子的朋友, especially兔宝宝 . e8 c% j: X; ~6 j. PI 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?; d; C2 \1 j, m- t