CoC Builder Base: A Complete Guide to Unlocks, Battles, and B.O.B. (2026)
The CoC Builder Base unlocks after your Home Village reaches Town Hall 6: repair the boat by the shore, then sail to a second village with its own Builder Hall, army, defenses, and Builder Gold and Builder Elixir. Builder Hall 6 opens a second battle stage, while Builder Hall 9 starts the task path to B.O.B., the permanent 6th builder for your Home Village. This guide explains how to unlock the island, earn resources, approach Builder Battles, and work toward B.O.B. with the current rules.
What the Builder Base is
The Builder Base is a second village on the same Clash of Clans account. It has a Builder Hall instead of a Town Hall, plus its own buildings, troops, heroes, defenses, upgrades, and resource storages. Builder Gold and Builder Elixir are separate from Home Village Gold and Elixir, so spending them here does not slow a Home Village upgrade.
Progress also works differently. The Master Builder handles upgrades, troops are selected for an active army, and battles use short, focused attacks. At Builder Hall 6, the map gains a second stage. O.T.T.O. joins the Master Builder as a second Builder Base worker; B.O.B. is a separate later reward for the Home Village.
How to unlock the CoC Builder Base
- Reach Town Hall 6 in the Home Village. Supercell’s current Builder Base support guide lists Town Hall 6 as the boat-repair requirement. Some older walkthroughs quote Town Hall 4 from the original 2017 launch post, so check the current in-game prompt if you see conflicting advice.
- Tap the wrecked boat near the shore and complete the repair prompt.
- Sail to the Builder Base. The boat remains the route between the two villages, so you can return to your Home Village whenever you need.
- Place your Builder Hall and follow the opening tasks. The tutorial introduces the local buildings, army, resources, and first upgrades.
If the boat is still unavailable, first confirm that the Home Village Town Hall is level 6. The Builder Hall is a different building and does not meet this unlock requirement.
What changes at Builder Hall 6
Builder Hall 6 opens the second stage of your Builder Base. It adds another area to build and defend, and unlocks the Reinforcement Camp system used in later-stage attacks. You can move eligible defenses between stages and set a defense plan for each one; the two areas are parts of one Builder Base, not separate villages. Supercell’s Builder Base 2.0 design notes explain that the Master Builder and O.T.T.O. can work on upgrades in either stage.
How Builder Battles work
Builder Battles are asynchronous attacks, not a live head-to-head duel. You attack an opponent’s base, and your own base becomes available to other players searching around a similar Builder Base Trophy count. You will not necessarily defend against the same player you attacked.
- Choose an Active Army before you queue. Supercell’s current battle guide gives you 60 seconds to scout the first stage and switch troop types before deploying.
- Earn up to three Bronze Stars on Stage 1. At Builder Hall 6 and above, defeating the first stage sends surviving troops into Stage 2. They receive healing based on your Healing Hut, hero abilities reset, and reinforcement troops become available.
- Earn up to three Silver Stars on Stage 2. A Builder Hall 6 or higher base takes a two-stage attack to clear. Think ahead about which troops and abilities you need to preserve for the second area.
The resource loop is different from the old “win three battles” advice:
| Action | What it provides |
|---|---|
| Attack and earn stars | Builder Gold, Trophies, and progress toward the daily Star Bonus |
| Defend against attacks | Builder Elixir, based on how many stars the attacker earns; collect it from the Elixir Cart by the shore |
| Complete the daily Builder Base Star Bonus | Additional Builder Gold and Builder Elixir; the required star count ranges from 7 to 12 depending on your Builder Base League |
Defenders do not lose stored resources when someone attacks. A stronger attack plan usually helps you earn stars and finish your daily bonus sooner: scout for dangerous defenses, avoid dropping every troop into the same splash-damage zone, and use troop abilities when they can change the path or keep a key unit alive. A simple army you understand is easier to manage than several troop types with competing roles.
A practical Builder Base progression plan
- Claim the Star Bonus regularly. Check the Battle button for the remaining stars, and collect Builder Elixir from the shoreline Elixir Cart after defenses.
- Invest in an attack you can repeat. Upgrade a troop group and Hero Machine you enjoy using, then learn how they handle Crushers, Multi Mortars, and other area defenses at your level.
- Plan Builder Hall upgrades around unlocks. The Hall opens new troops, buildings, camps, and stages. You do not need to max every low-priority defense before moving up; upgrade when you can make use of the new options and support the higher-level costs.
- Build both stages for coverage. Keep an eye on air and ground approaches, avoid leaving one stage easy to clear, and adjust your defensive layout after seeing which attacks repeatedly reach it.
- Use the Clock Tower and builders with a plan. The Clock Tower can boost Builder Base activity for a limited period. Activate it when you can benefit from the boost, and start another useful upgrade before your Builder Base builders go idle.
How to unlock the 6th builder with B.O.B.
At Builder Hall 9, you can work on B.O.B.’s Control and its four requirements. Completing them lets B.O.B. join your Home Village as a permanent sixth builder:
- Gear Up three eligible buildings in the Home Village.
- Upgrade any Builder Base troop to level 18.
- Upgrade any Builder Base defense to level 9.
- Reach a combined total of 45 levels across your Builder Base Hero Machines.
Work toward these goals over time rather than treating them as one final grind. For example, you can choose a troop and defense that also strengthen your regular attacks while raising Hero Machine levels. O.T.T.O. and B.O.B. have different jobs: O.T.T.O. helps with Builder Base construction from Builder Hall 6, while B.O.B. is the Home Village sixth builder earned through the Builder Hall 9 tasks. The current Supercell guide to sending builders between villages lists the B.O.B. requirements; the Builder Base 2.0 update notes describe the original change from O.T.T.O. to B.O.B.
Quick answers
What Town Hall do I need to unlock Builder Base?
Town Hall 6 in the Home Village. Repair the boat to travel to the island.
Does Builder Hall 6 give me another builder?
Builder Hall 6 unlocks Stage 2 and O.T.T.O. as the second Builder Base worker. The Home Village’s sixth builder is B.O.B., earned from the Builder Hall 9 task set.
Do Builder Battles steal my stored resources?
No. Attacks award Builder Gold and stars; defenses determine Builder Elixir earnings, which you collect from the Elixir Cart. The Star Bonus adds another daily source of both resources.
Do I have to max my Builder Base before upgrading the Builder Hall?
No blanket max-first rule is required. Consider what the next Builder Hall unlocks, whether you can afford the upgrades, and how comfortable you are attacking its stages. Matchmaking is based on a similar Builder Base Trophy count, according to Supercell’s current battle guide.
The most reliable way to grow your CoC Builder Base is to understand its separate resource loop, collect the daily Star Bonus, and make Builder Hall upgrades when new options will help your army or defense. Builder Hall 6 opens the two-stage system; Builder Hall 9 starts the B.O.B. tasks. These milestones give the second village a clear purpose while you keep your Home Village progressing.
