Yes, I have 5th builder at Clash of Clans for free at last. I got it at Town Hall 8. Getting 5 builders before TH9 is a bit wasted because you can’t finish upgrade all the troops in the lab on time. Lab upgrade takes longer time than buildings. However, things change at Town Hall 9. There are lot of buildings, both King and Queen to upgrade. And those high level upgrades take longer time than before. So getting 5th builder will surely speed up the game progress.