Demolition strongly depends on the region and the building materials.
Wood costs surprisingly much to dispose of.
The roof could be made of Eternit panels, which contain asbestos.
Construction debris depends on the pollutant class.
Transport costs depend on the distance to the landfill.
I would try to sell wood and sandstone or get rid of them by pickup. Especially old oak beams and stones from the foundations are in demand.
I estimate the demolition of our barn including asbestos was about 10k.
We kept the stones. The demolition contractor took the wooden beams.
The cladding decorates another barn.
One intermediate floor is still here, makes a loft bed or two.