I have recently had a sizeable plastering and rendering job done on my house, and having accounted for well over the quoted figure, have still had a bill that has utterly shocked me! There are a couple of items on there that I was hoping some professionals could let me know what they think should be costed at please (in the context of a bigger job), just as a point of reference; not being in the trade I have no idea whether I am being ripped off or not!

Supply and fixing of metal lathing to an internal wall measuring 187 cm wide x 180 cm high.

This one is not as relevant to this forum but thought it best not to create lots of different threads; supply and fitting of 4 concrete lintels - three above standard 1m wide windows, one above a standard UPVC single door, and one above a wooden double door.

As I say, I just need some vague idea of whether my bill is ridiculous or not, so any input from professionals would be great thanks.