想延伸retaining wall是不是需求请求

holyfeld

家里retaining wall有几米长，想延长到全部后院的的宽度，高度低于600, council网站上說has to be separated from any other retaining wall on the site horizontally by at least two metres as shown below.这是甚么意思?就说我得两头空2米能力修么?