I think you should be able to upgrade your builders huts with gems so that they work faster!
so let's say:
Builder hut level one(like how it comes)- 100% of time to finish task
level two- 250 gems to upgrade- 150% of time to finish
level three- 250 gems to upgrade- 200% of time to finish
if this becomes popular than I will make some pictures for you guys!

