In the US, lighthouses have been sold to private individuals. There's one I know on Cape Cod that's some sort of vacation rental. Apparently the Graves Lighthouse in Boston Harbor is also now privately owned. [1]
A couple points of information that you may know but others may not realize:
1.) Not all lighthouses are particularly isolated. Sure, some have only boat access and have difficult landings--see the Graves. But many are on roads on the mainland or on large islands.
2.) Again the Graves notwithstanding, the lighthouse keeper's house is often a cottage off to the side as opposed to the "lighthouse" itself.
A couple points of information that you may know but others may not realize:
1.) Not all lighthouses are particularly isolated. Sure, some have only boat access and have difficult landings--see the Graves. But many are on roads on the mainland or on large islands.
2.) Again the Graves notwithstanding, the lighthouse keeper's house is often a cottage off to the side as opposed to the "lighthouse" itself.
[1] https://en.wikipedia.org/wiki/The_Graves_Light