Render coats are applied on solid substrates such as brickwork, blockwork and concrete, in moderate exposure conditions. It is used to prevent rain penetration. You can apply just one coat or up to three.

The thickness of the rendering is determined by, the evenness of the background and the surface desired. If the background is relatively uneven, such as ordinary brickwork, and the surface needs to be smooth, then you need to have a total thickness of 10–15
mm.

It takes 4-6 weeks for the render to cure, which makes me think that I won’t be seeing much progress for construction from the outside. In this time, they may continue working on the inside of the house.