Get assistance with building upgrades and research tasks with the Goblin Builder in Clash of Clans. Here's what you need to know about this character.

The Goblin Builder is a nifty little helper in Clash of Clans who can be used to assist players with building upgrades and research tasks.
They are exactly the help most players need to advance their base development without being held back by the limited number of builders or lengthy upgrade times.
If you're interested in learning about how you can unlock the Goblin Builder in Clash of Clans and know how to use them, here are the answers you are looking for
How To Unlock The Goblin Builder In Clash Of Clans

You will need to spend Gems to activate the Goblin Builder in Clash of Clans. The Gem cost depends on the construction or upgrade time of the task. The longer the upgrade time, the higher the Gem cost. However, boosts from the Season Pass can reduce the Gem cost.
The Goblin Builder can only be unlocked if the player is Town Hall level 7 or above and has all five Builders unlocked (not including B.O.B).
How To Use The Goblin Builder In Clash Of Clans

During the Work for Hire event, players will be able to find the Goblin Builder's workshop near the Trader's tent at the Home Village.
In essence, the Goblin Builder works as an extra builder when all the other builders are occupied. They can help with the construction and upgrading of buildings as well as perform additional research tasks at the Laboratory. Goblin Builders can only work on one item at a time.
As mentioned earlier, Gems will need to be spent to utilize the Goblin Builder. Resources are still required to upgrade any item using this Builder. Canceling an upgrade that the Goblin Builder is working on will still refund 50% of the resources spent, but not the Gems used.

Players can tap on the Goblin Builder head icon at the top of the screen underneath either the Builder or Research tray to view the progress of their upgrade timers.
It's fair to note that Builder Potions will affect the upgrade speed of the Goblin Builder. Any upgrades that remain unfinished after the Work For Hire event ends will continue upgrading until the progress is complete.