Updated for Town Hall 18 (October 2026).
The Master Builder’s Hut no longer exists. It was the Home Village hut that let the Master Builder work as your sixth Builder, and the Builder Base 2.0 update of May 15, 2023 replaced it with B.O.B’s Hut. The Master Builder himself is still in the game as the main Builder of the Builder Base, and he still crosses over to gear up three Home Village defenses.
What the Master Builder’s Hut was
From June 18, 2019 until May 2023, finishing the five-level O.T.T.O Hut on the Builder Base unlocked a special hut in the Home Village. Moving the Master Builder into it gave you an extra Home Village Builder, while O.T.T.O, a robot helper, took over on the Builder Base. The hut sat on a raised platform with a ladder, could not be upgraded, and could not be bought with Gems or Builder packs. In practice it needed Town Hall 10, an indirect requirement of the O.T.T.O Hut tasks.
What replaced it: B.O.B’s Hut
Builder Base 2.0 renamed the O.T.T.O Hut to the B.O.B Control and swapped the reward. Instead of borrowing the Master Builder, you now get B.O.B, a barrel-bodied robot Builder who lives permanently in the Home Village.
- B.O.B’s Hut is a 2×2 building with 250 hitpoints. It cannot be upgraded or bought; it only comes from finishing the B.O.B Control.
- Unlike the old hut, you cannot send B.O.B back to the Builder Base. The Master Builder and O.T.T.O stay there for good.
- Players who had already finished the O.T.T.O Hut kept their progress when the update landed.
How to unlock B.O.B
The B.O.B Control appears at Builder Hall 9. Each level costs no resources or time; you upgrade it by completing a task, in this order:
| To reach B.O.B Control level | Task |
|---|---|
| 2 | Gear Up a Cannon, an Archer Tower and a Mortar in the Home Village |
| 3 | Upgrade any Builder Base troop to level 18 (needs Star Laboratory 9) |
| 4 | Upgrade any Builder Base defense to level 9 |
| 5 | Get the Battle Machine and Battle Copter to a combined level of 45 |
Reaching level 5 unlocks B.O.B’s Hut in your Home Village. The hero task is usually the slowest. For the troop task, putting all your Star Laboratory time into one spammable troop gets you to level 18 fastest, and the Multi Mortar is a convenient level 9 defense since the Gear Up step already needs it at level 8.
The Master Builder today
The Master Builder lives in the Builder Hall and does the building work on the Builder Base. From Builder Hall 4 he can take the Builder Boat to your Home Village and Gear Up one of each of these defenses, adding a second firing mode borrowed from its Builder Base cousin:
| Home Village defense | Level needed | Builder Base requirement | Geared Up mode |
|---|---|---|---|
| Cannon | 7 | Double Cannon level 4 | Burst of four cannonballs, shorter range |
| Archer Tower | 10 | Builder Base Archer Tower level 6 | Fast Attack, shorter range |
| Mortar | 8 | Multi Mortar level 8 | Bursts of three shells |
Gear-ups can only be finished early with Books, not Hammers. While the Master Builder is away, O.T.T.O (from Builder Hall 6) and B.O.T.O cover the Builder Base work. He also pilots the Battle Machine and the Battle Copter.
More Builders in 2026
The May 26, 2026 update added another Builder for the Builder Base. B.O.T.O’s Shack is a 2×2 building sold in the Shop from Builder Hall 2 for 1,000 Gems, and it only becomes available once all your Home Village Builder’s Huts are unlocked. Counting B.O.B, a fully set up account in October 2026 has six Home Village Builders, plus the Gem-paid Goblin Builder during events.
Master Builder FAQ
Where is the Master Builder’s Hut?
It was removed on May 15, 2023. If you finished the old O.T.T.O Hut, your hut became B.O.B’s Hut automatically.
Can the Master Builder still work in the Home Village?
Only to Gear Up the Cannon, Archer Tower and Mortar. He can no longer act as a regular sixth Builder there; B.O.B does that job.
What Town Hall do you need for B.O.B’s Hut?
Effectively Town Hall 10, because the Gear Up task needs a level 8 Mortar.
Sources: Supercell release notes (Supercell, Builder Base 2.0 patch notes, Supercell, May 2026 update) and in-game data.
