Builder Hall 9 (BH9) is one of the most competitive levels in Clash of Clans’ Builder Base. At BH9, you gain access to powerful new defenses and troops, and the gap between a well-designed and poorly-designed layout becomes very significant. Unlike the Home Village where getting 3-starred is the norm, Builder Base battles are decided by percentage damage — getting fewer stars (and lower percentage) than your opponent wins you the battle.
This guide covers the principles of effective BH9 layout design, what buildings you get at Builder base 9 layout, upgrade priorities, and detailed layout strategies for anti-2 star defense and trophy pushing.
What Do You Get at Builder Hall 9?
| Building/Feature | New at BH9 | Notes |
| Builder Hall | Level 9 upgrade | Required to access BH9 content |
| O.T.T.O Hut | New building | Allows 5th Builder when fully upgraded — highest priority |
| Mega Tesla | 2nd Mega Tesla | Extremely powerful single-target defense |
| Scattershot | New defense | Area damage; excellent vs swarms |
| Roaster | Level cap increase | Fire damage over time |
| Cannon Cart | New troop | Ranged troop; strong in Builder Base attacks |
| Night Witch | Level cap increase | Spawns Bats; powerful air support |
| Wall capacity | Additional walls | More compartment options |
| Additional Heroes | Battle Machine upgrades | Battle Machine cap increases at BH9 |
O.T.T.O Hut — Why It’s Your #1 Priority at BH9
The O.T.T.O Hut is the most important building you unlock at Builder Hall 9. When fully upgraded, it converts into O.T.T.O — your 5th Builder, which works in the Builder Base while your other 4 Builders work in the Home Village. A 5th Builder permanently increases your upgrade speed by 25%, making it one of the highest-value unlocks in the entire game.
Requirements to unlock O.T.T.O (must complete all of these):
- Upgrade the Cannon Cart to level 18
- Upgrade the Mega Tesla to level 9
- Upgrade the Battle Machine to level 30
- Upgrade the Hog Glider to level 11
These requirements are grindy — especially the Battle Machine to level 30. Plan your upgrade path specifically around unlocking O.T.T.O as fast as possible, as the 5th Builder pays dividends across your entire account.
BH9 Upgrade Priority Order
| Priority | Upgrade | Reason |
| 1st | O.T.T.O Hut + requirements | 5th Builder is the biggest long-term gain |
| 2nd | Battle Machine | Needed for O.T.T.O; biggest Hero upgrade impact |
| 3rd | Mega Tesla (both) | Highest DPS single-target defense at BH9 |
| 4th | Scattershot | Area damage fills gap vs swarm attacks |
| 5th | Cannon Cart (troop) | Also needed for O.T.T.O; strong attack troop |
| 6th | Roaster | Good sustained damage defense |
| 7th | Air Bombs / Mega Mine | Trap upgrades improve defense significantly |
| 8th | Walls | Fill in after primary buildings are upgraded |
Builder Base 9 Layout Principles
Before sharing specific layout designs, understanding WHY good layouts work helps you evaluate and adapt any base:
Principle 1: Protect the Builder Hall Above All Else
In Builder Base battles, destroying the Builder Hall grants an automatic star to the attacker. If your Builder Hall is easily accessible — near the edge, in a thin compartment, or unprotected — attackers can guarantee at least 1 star. The Builder Hall must be in the deepest, most protected compartment of your base.
Principle 2: Use Multiple Compartments
Compartmentalization is the foundation of good Builder Base defense. Walls divide the base into separate sections — attackers must break through multiple layers to reach core defenses. Each compartment creates a ‘time tax’ on the attacker, eating up precious seconds of the 3-minute battle clock. Aim for 3 to 5 concentric layers of defense around your Builder Hall.
Principle 3: Place Mega Teslas Centrally
The Mega Tesla has the highest single-target DPS of any Builder Base defense and targets both ground and air. Placing both Mega Teslas in the core — deep enough that attackers cannot reach them without crossing multiple compartments — maximizes their impact. A Mega Tesla near the edge will be destroyed early; in the core, it fires for the entire attack.
Principle 4: Spread Defenses to Avoid Clustering
If all your defenses are in one area, a well-aimed spell or ability can neutralize multiple at once. Spread high-value defenses (Mega Teslas, Scattershot, Roaster) so no single attack ability can hit more than one simultaneously. This is especially important against Hog Glider and Night Witch attacks.
Principle 5: Anti-Air Coverage Everywhere
Air attacks (Night Witch + Bats, Minion/Dragon-type troops) are dominant at BH9. Air Bombs, the Roaster, and the Scattershot must have overlapping coverage of all areas of the base. A base that has no anti-air coverage in one quadrant will be consistently 2-starred by air attacks targeting that zone.
Principle 6: Use Traps Actively
Builder Base traps — Mega Mines, Spring Traps, Push Traps — are powerful at BH9. Place Mega Mines near expected entry points where large numbers of troops will funnel, and Spring Traps in corridors where troops will walk in a line. Traps reset after each defense — use them aggressively.
BH9 Layout Designs: 3 Approaches
Layout Type 1: Anti-2 Star Base (Most Common Goal)
The primary goal for most BH9 players is preventing the attacker from getting 2 stars — forcing them to either destroy the Builder Hall (1 star) or get high enough percentage (1 star) but not both. An anti-2 star base achieves this by:
- Placing the Builder Hall in a deep central compartment with at least 3 layers of walls and defenses between it and the edge
- Distributing enough firepower in outer compartments to cost the attacker significant percentage before they reach the core
- Using the Mega Teslas as the final ‘boss’ defenses in the innermost ring — they are the last thing an attacker must defeat
- Placing the Scattershot at mid-range — far enough in to survive early attacks but with range to cover outer approaches
Key layout features for anti-2 star: asymmetric design (prevents easy funneling), multiple small compartments on the exterior (troops get stuck and waste time), and no open corridors that allow troops to path directly to the Builder Hall.
Layout Type 2: Anti-1 Star / Trophy Pushing Base
For aggressive trophy pushing, you want to prevent even 1 star — meaning the attacker cannot destroy the Builder Hall. This requires:
- An extremely well-protected Builder Hall — 4+ compartment layers minimum
- Heavy defenses in the outer ring to slow attacker progress significantly
- The Builder Hall placed off-center (not geometric center) to confuse funneling attempts
- Spring Traps near Builder Hall approaches to push troops away from the final compartment
Pure anti-1 star bases are uncommon at BH9 because the percentage damage mechanism means even if you stop the Builder Hall destruction, a high-enough damage percentage still gives the attacker the same outcome in a close battle.
Layout Type 3: Balanced Trophy Base
The most practical BH9 layout for most players is a balanced design that:
- Reliably denies the 2nd star in most attacks
- Frequently denies the 1st star against average attackers
- Uses natural chokepoints to slow even skilled attackers
- Has consistent anti-air and anti-ground coverage without obvious weak sides
A balanced layout accepts that exceptional attackers will occasionally 2-star you — the goal is to win more battles than you lose, not to be impenetrable.
BH9 Layout Design: What to Place Where
| Zone | Buildings to Place | Why |
| Core (innermost) | Builder Hall, both Mega Teslas | Maximum protection; fire from center to all directions |
| 2nd ring | Roaster, Scattershot, Crusher | High-damage defenses need protection to be effective |
| 3rd ring | Firecrackers, Guard Post, Cannon | Mid-range defenses slow attackers before core |
| Outer ring | Resource buildings, Archer Tower | Resources are acceptable sacrifices; Archer Tower covers perimeter |
| All zones | Air Bombs, Mega Mines, Push Traps | Spread traps to cover all attack paths equally |
Common BH9 Layout Mistakes to Avoid
- Builder Hall near the edge or in a corner: Easiest mistake to exploit — attackers can destroy it in seconds
- Both Mega Teslas clustered together: A single Battle Machine Ability hit or spell can damage both simultaneously
- No compartments — open base design: Troops path freely to the Builder Hall without obstruction
- All defenses on one side: The opposite side becomes an easy entry point for any attacker
- Traps placed randomly: Traps should be placed where troops will actually walk — near entry gaps, inside corridors, not in open corners
- Resource buildings in the core: Resources are worth percentage — keeping them outside forces attackers to choose between high percentage or Builder Hall destruction
How to Find and Import BH9 Layout Links
Clash of Clans allows players to copy base layouts using shareable links. To import a BH9 layout:
- Step 1: Find a BH9 layout link from a trusted source — ClashChamps, ClashOfStats, or CoC content creators on YouTube
- Step 2: Copy the layout link
- Step 3: In CoC, go to your Builder Base → Edit Layout → Import Layout → paste the link
- Step 4: Adjust any buildings that don’t fit (your upgrade levels may differ from the layout creator’s)
Note: The most effective layouts change as the meta evolves. A layout that was dominant in 2023 may be countered by 2025 attack strategies. Use recent layouts from current creators and look for ones that have been tested against current attack trends.
Frequently Asked Questions
What is the best Builder Base 9 layout in CoC?
The best BH9 layout depends on your goal. For anti-2 star defense (most common), look for bases with the Builder Hall in a deeply central compartment, both Mega Teslas in the core, Scattershot at mid-range, and 3+ concentric rings of walls and defenses. Asymmetric designs are harder to funnel than symmetric ones. Current top-rated BH9 layouts are available on ClashChamps and ClashOfStats with shareable import links.
Where should I place the Builder Hall at BH9?
The Builder Hall must be in the innermost compartment of your base — the deepest, most protected position. Never place it near an edge, in a corner, or in an outer compartment. Attackers get a free star for destroying it, so making the Builder Hall as hard to reach as possible is the single most important layout decision at any Builder Hall level.
What should I upgrade first at Builder Hall 9?
The O.T.T.O Hut and its requirements are the top priority at BH9 — unlocking the 5th Builder is the biggest long-term gain in the game. This requires upgrading the Battle Machine to level 30, Mega Tesla to level 9, Cannon Cart to level 18, and Hog Glider to level 11. Focus resources on these objectives before general defense upgrades.
How do Builder Base battles work at BH9?
Builder Base battles are 1v1 matchups where both players attack each other’s base simultaneously. The player who destroys a higher percentage of the opponent’s base wins the battle and gains trophies. If percentages are tied, the player who achieved their percentage faster wins. Stars (Builder Hall and 50% destruction) are secondary to total percentage in determining the winner.
Final Thoughts
Builder Hall 9 is a major milestone in Clash of Clans — the O.T.T.O unlock makes it one of the most impactful upgrades in the entire game, and the new defenses (Scattershot, 2nd Mega Tesla) make BH9 bases genuinely formidable when well-designed. Focus your upgrade path on O.T.T.O requirements first, then build your layout around protecting the Builder Hall with multiple compartment layers and centrally placed Mega Teslas. The investment in BH9 pays off across your entire account through the permanent 5th Builder.
