LZ的想法没什么问题。就是细节上的事情比较多。要申请Building Permit:需要设计图及相关的计算。外墙和承重墙(柱)的相关计算。屋内的设计可能需要有改动:比如楼梯的面积要从一层中空出来。水电气(主要是冷热气管道)的加装等。二楼窗户的朝向和大小的限制,楼高的限制,屋顶倾斜度的设计等等。程序也是近10大方面,约50道小工序。, _. \7 l* U L
如感兴趣,可约个时间聊聊。
Had the same idea to add a half story (~700ft^2) on my 4-level split. Talked to 2 contractors with both quote over $300K. Not worth it. Brand new construction would only cost <$500K. Good luck.