I assumed that the entire length of the weatherboard would be replaced, but no, the joiner is able to just cut out the damaged part, and insert a new part.
I made that sound easy... it's a bit more complicated than that!
First of all, finding matching weatherboards is challenging. Not just getting the right size (as mentioned previously, there are lots of different sizes of rusticated weatherboards). But getting the same depth/contour of the scalloped bit.
The joiner went to 3 different salvage/reclamation yards before finding anything similar.
And even then he had to shave 2mm off the scalloped bit to make it consistent with what's already on our house.
Above: the new weatherboard pieces from the reclamation yard have been screwed into place.
After screwing the new weatherboard pieces into place, the joiner then applied filler to make them look smooth and consistent.
After: Taking this "after" photo was surprisingly difficult, as I couldn't actually spot the joins! Nice workmanship :)
The weatherboards are now undercoated, so that they're ready to be painted.
But there's a bit more work to be done on our porch, bay front and stairs before the painters come.
Above: this is what the wall looks like, minus weatherboards. There's some kind of sacking material between the wood and what's probably the gib board.