Is the Builder Base Worth It? B.O.B, Daily Star Bonus and When to Stop

Last checked: October 11, 2026. The B.O.B requirements come from Supercell's Builder Base 2.0 announcement. Builder Battles, Builder Base Leagues, the daily Star Bonus and troop rules come from Supercell's support articles. Cross-mode effects come from Supercell's Hoggy Bank, Gold Pass and Clan Games sources. All are linked where they appear. The time-budget arithmetic and the stop-or-continue framework are ClashVault editorial analysis, not Supercell guidance.

Many Home Village players treat the Builder Base as a chore. Some ignore it entirely, which is a mistake. It holds one reward that permanently speeds up your main village. It also feeds a handful of smaller systems you already care about. After that, how much time you give it is genuinely up to you. This guide shows what the Builder Base is worth, how little daily time it really needs, and when you can stop.

A note on older advice: guides written before May 2023 talk about O.T.T.O. and Versus Battles. Supercell's Builder Base 2.0 announcement replaced O.T.T.O. with B.O.B as the sixth-builder reward and changed the unlock tasks. If a guide tells you to unlock O.T.T.O., it is out of date.

Current season: October 2026

Dates come from Supercell's October announcement and our events calendar. This is the only section we update each month.

The main prize: B.O.B, your sixth builder

B.O.B is a robotic extra builder for your Home Village. Supercell's Builder Base 2.0 post lists what unlocks him. Reach Builder Hall 9, then complete four tasks:

Players who had already unlocked O.T.T.O. had it replaced by B.O.B, and the Master Builder returned to the Builder Base as its second builder, per the same post.

The ClashVault arithmetic on why this matters: going from five builders to six adds 20% more building capacity (6 ÷ 5 = 1.2), and that extra capacity never goes away. No other single Builder Base reward compares, which is why B.O.B is the target to plan around.

Check how close you are with the B.O.B readiness checklist, which tracks these exact requirements. For the Builder Hall itself, see Builder Hall 9.

Notice how narrow the requirements are

Every task says "any". You need one troop at level 18 and one defense at level 9, not all of them. That shapes an efficient path (editorial):

• Pick one troop and one defense to push. Upgrading everything evenly delays the two levels that actually count.
• Treat Hero levels as a shared total. The requirement is 45 combined, so levels on either Hero count toward it. Supercell's post notes the Battle Copter starts at level 15 when you buy it.
• Don't let the Star Laboratory sit idle on the way. Troop level 18 comes from the lab, per Supercell's Builder Base Heroes & Troops article.

How Builder Battles work now

Supercell's Builder Battles article describes the current format:

• Two stages from Builder Hall 6. You earn up to 3 Bronze Stars on the first stage. If you clear it, surviving troops and Reinforcements move on to the second stage, for up to 3 Silver Stars.
• Attacks earn Builder Gold and Builder Trophies, based on how well you do and your current Builder Base League.
• Defenses earn Builder Elixir: the fewer stars an attacker earns, the more Builder Elixir you collect from the Elixir Cart.
• Matchmaking is by Builder Base Trophies, and battles are not head-to-head. Attacking opens your base to other searching players.
• You get 60 seconds of preparation to scout and swap troop types before the battle starts.

How much daily time does it really need?

The daily Star Bonus is where Builder Base resources add up. Supercell's Builder Battles article says it takes 7 to 12 stars depending on your Builder Base League, with Bronze and Silver stars each counting as one Bonus Star. The reward grows as you climb the leagues, per the Builder Base Leagues article.

ClashVault arithmetic on what that costs:

So a daily routine of two to three battles usually clears the bonus. That is the most efficient Builder Base habit: short and daily, rather than long sessions you can't sustain.

What it gives your Home Village besides B.O.B

These are smaller, but they are why some players keep visiting after B.O.B:

• Clan Games challenges. Supercell's Clan Games challenges article says some challenges can only be completed in the Builder Base. Its 2021 Clan Games changes set Builder Base tasks at about 100–150 points per attack. Our Clan Games guide covers point budgeting.
• Hoggy Bank. Supercell's Hoggy Bank article says Builder Gold from attacks and Builder Elixir from defenses are added to the Hoggy Bank as well as your storages.
• Season and event reward scaling. Supercell's Gold Pass changes post says Season Pass rewards scale with your Town Hall and Builder Hall at the start of the season. Our Gold Pass guide explains what that means for the purchase.

Should you keep going after B.O.B?

The editorial answer depends on how you play:

If you do stop, keep the Star Laboratory and the Builder Base builders busy when you visit, so occasional sessions still move the account. And keep using your extra builder at home: the Left to Max planner and the builder planning guide show where six builders make the biggest difference.

Getting there faster: a routine

1. Set the target. Check the B.O.B checklist and write down the one troop, one defense and the Hero levels you still need.
2. Two to three battles a day for the Star Bonus, which funds the upgrades.
3. Keep the Star Laboratory on your chosen troop until it reaches level 18.
4. Spend Builder Gold and Builder Elixir on the requirements first, and only then on extra defenses.
5. Revisit the checklist weekly, so you don't overshoot one requirement while another lags.

Quick answers

When can I start the Builder Base? Supercell's About Builder Base says you rebuild the boat at Town Hall 6.

Is the sixth builder still O.T.T.O.? No. Supercell replaced O.T.T.O. with B.O.B in the May 2023 Builder Base 2.0 update, with new unlock tasks.

Do I need to max every troop for B.O.B? No. Supercell asks for any one troop at level 18, any one defense at level 9, three Gear Ups and 45 combined Hero levels, after Builder Hall 9.

How many battles a day should I play? Usually two or three. The daily Star Bonus needs 7 to 12 stars depending on your league, and a two-stage battle can earn up to six.

Do Builder Base trophies reset? Supercell says players above 5,000 Builder Base Trophies (Emerald II or higher) are reset to 5,000 when the season ends.

Can I ignore the Builder Base after B.O.B? Yes, if you don't enjoy it. You give up some resources, league rewards and Builder Base Clan Games tasks, but not the main Home Village benefit.