I have not yet gotten a master Builder... I need one!! I have them working on the hut all the time. Am I missing something else they can do? Lagoon is done.. Thanks Dianna

Master builder's and Master Healer's seem to take forever to actually progress, don't worry they will show up eventually.

Maybe you have too many so the work (and experience) gets spread around... there are more things to build after clearing the lagoon though... so if you haven't done them yet, there's plenty of time