Had a job enquiry, some one wants a wall rebuilding on the perimeter of there commercial premises. The wall is seperating the car park from the footpath/road. A car has hit and its moved it off its base. the wall is about 2 meters high and the section to be rebuilt is about 5m long. The client tells me its single skin. What i am wondering is, does a wall that size to be safe want to be double skin and because its on the perimeter, does building controls need to know about the work (spec and plan). Any advice will be greatfuly received.