This will vary wildly build to build. We had about 16 truckloads of fill dirt brought in to raise the deep end grade because our yard was not level. That resulted in them dumping a bunch of dirt sort of far away from the existing excavation and construction mess, destroying more grass in the process. We also ended up with a hill that was eroding every time it rained. The total area that needed to be reseeded was about 6000 square feet.
I received a couple of quotes-one for sodding and one for seeding. It was about $4500 to bring in top soil, leafgro, fertilizer, do a final grade, and labor. It was about $2700 for the same thing but with seed instead of sod. We ended up going a different route and kinda doing both but were able to get a significant discount due to family member connections. The rest so far has been a few plants on the side of the waterfall and we did that ourselves. We still plan to plant a few more trees as well but will also do that ourselves. Check out my thread in my signature, I will post some new drone shots tomorrow.
It will really vary significantly depending on what you want done. I talked to somebody the other day who had some landscaping done when her house was built which were decorative trees, mulch, and other things and spent $14,000. She referred to it as, “the little bit of landscaping we had done...”