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工程不小,要破地下室的水泥墙体,门外还得做个挡雨的篷什么的,门外周围还得作防水和处理雨水的水槽什么的。
 
need building permit for sure
 
should check storm water pipe in the survey drawing.
or grading plan from the city.
Otherwise, city won't approve the building permit.

If you use natural slope of the ground, you may still need retaining wall to reduce the impact to neighbours.
 
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