Fallout 4: Best Demolition Expert Build

Discover the Best Demolition Expert Build in Fallout 4 and how to create a powerful character with Perks, S.P.E.C.I.A.L., Stats, armor, and weapons.

This build guide has been updated for Game version 1.10.980 on PC and Free Next Gen Update on PlayStation and Xbox.

Best Demolition Expert Build in Fallout 4

The demolition expert build is powerful and versatile, using explosives to destroy enemies and obstacles. What makes the Demolition Expert build unique are weapon perks that stack and add multiple damage amplifications simultaneously. You can use Spray n’ Pray and gain the benefits of Commando, Demolition Expert, and Bloody Mess! Thus, you have one of the highest damage-producing weapons due to multiple perks adding to the overall weapon’s damage rather than one. Moreover, you will have various weapons and grenade choices in the Wasteland.

The downside of the build is friendly fire, which you can damage yourself with explosives. However, we will take defensive and survivability perks to protect against explosives. Moreover, you forgo Intelligence SPECIAL stat, so don’t expect to have every crafting perk unlocked at level 50. However, if you enjoy watching things go “boom,” the Demolition Expert build is for you!

Demolition Expert Build ProsDemolition Expert Build Cons
Huge DamageFriendly Fire
Weapon VarietyForgo Intelligence
Simple to PlayWeapon Dependent

Features and Mechanics for Best Demolition Expert Build in Fallout 4

The following list presents all the essential Demolition Expert Features and Mechanics in Fallout 4:

  • Damage – Explosive
  • Range – 75 meters
  • Weapon – Heavy Automatic
  • S.P.E.C.I.A.L. STATS
    • Strength – 7
    • Perception – 5
    • Endurance – 7
    • Charisma – 1
    • Intelligence – 3
    • Agility – 2
    • Luck – 3
  • Best Perks – Demolition Expert, Heavy Gunner, Commando, Adamantium Skeleton
  • Companion – Curie

S.P.E.C.I.A.L. Stats

The best S.P.E.C.I.A.L. stats for the Demolition Expert build are 7 strength and 7 endurance. Strength is necessary because it contains Heavy Gunner, Armorer, and Steady Aim perks. These will help you with larger weapons, hip fire accuracy, and carrying more materials. Endurance is vital for survivability perks like Adamantium Skeleton, Life Giver, and Toughness. Intelligence contains medic and gun nuts that are useful for survivability and crafting. Agility has Commando, which is excellent for automatic weapons. Lastly, Luck has Bloody Mess, useful for a flat increase in damage and explosive kills.

Below are the best recommended S.P.E.C.I.A.L. Stats for the Demolition Expert build in Fallout 4 videogame RPG:

  • 7 Strength (S): influences your carrying capacity, melee damage, and the effectiveness of melee weapons.
  • 5 Perception (P): affects your accuracy in VATS, the chance of detecting stealthy enemies, and the ability to pick locks and spot traps.
  • 7 Endurance (E): It affects your maximum health, radiation resistance, and ability to withstand environmental hazards.
  • 1 Charisma (C): influences your success in dialogue options, ability to negotiate prices with vendors, and effectiveness in leading companions.
  • 3 Intelligence (I): affects the number of experience points earned, the quality of crafted items, and your effectiveness with high-tech weapons and terminals.
  • 2 Agility (A): It affects your overall movement speed, ability to sneak effectively, and performance in VATS.
  • 3 Luck (L): affects critical hit chance, the likelihood of finding valuable items, and the outcome of random events.

Additionally, consider collecting Bobbleheads throughout your Fallout 4 (FO4) adventure. Bobbleheads are collectible items scattered throughout the game world. Each bobblehead represents a particular attribute or skill, and when collected, it permanently increases your character’s corresponding stat or ability.

Best Perks

The best perks for a Demolition Expert build are Demolition Expert, Heavy Gunner, Commando, and Adamantium Skeleton. Three different weapon damage perks can have a stacking effect, meaning one weapon can get boosted by multiple perks if they fire grenades and are fully automatic or have explosive rounds. Moreover, you want an Adamantium Skeleton and Medic for increased survivability and reduced limb damage if you fire a grenade, rocket, or explosives too close.

Here is the list of the best and recommended Perks for the Demolition Expert Build in Fallout 4:

  • Demolition Expert – increases explosion size, grants arc, and grenades shot in VATS do double the damage. This cornerstone perk also stacks on other weapon damage perks like Heavy Gunner and Commando.
  • Heavy Gunner – increase for heavy weapons, which come later in the game vs. early on.
  • Commando is another bonus weapon damage perk for fully automatic weapons and hip fire (not in VATS). All three weapon types can give stacking additional benefits and even more damage.
  • Adamantium Skeleton – with explosives, you will take self-inflected damage, and this helps prevents you from being crippled in combat.
  • Medic – you will need a lot of burst healing without running Lone Wanderer, and this is very helpful early and late game.

In Fallout 4, perks are special abilities and bonuses that enhance your character’s skills, combat prowess, and survival capabilities. Perks are acquired by spending perk points each time your character levels up. Perks are divided into categories, each corresponding to one of the S.P.E.C.I.A.L. attributes.  These perks offer a wide range of customization options, allowing players to tailor their characters to suit their preferred playstyles.  However, there are no respecs or redoing of Perks. Thus, your selections are vital to increasing your character’s overall power.

Level Progression

The Demolition Build focuses on explosive, heavy, and automatic weapon damage perks. You can use a variety of weapons, some with stacking damage bonuses. Moreover, you will need multiple defensive and survivability perks, especially at the start, where you won’t have powerful weapons. As the levels advance, you gain more damage and utility perks like crafting, locksmith, and Scrounger. These will help you with general gameplay and keep the ammunition flowing when you need bullets desperately. Lastly, we forgo intelligence to emphasize multiple weapon types and survivability. Beyond level 50, you can increase your intelligence and gain science if you enjoy advanced crafting mods. Or, you can increase charisma and gain Local Leader for settlement gameplay.

Level 1 – 10

During the initial levels, you will invest in damage reduction perks to keep your survivability high. Commando, Demolition Expert, and Heavy Gunner help you get more damage. However, there is “friendly fire,” so ensure any explosive weapon is fired at range.

Here’s a list of the best perks to select from levels 1 to 10 with the Demolition Expert Build Guide in Fallout 4:

  • Level 1 – None
  • Level 2 – Commando
  • Level 3 – Scrounger
  • Level 4 – Life Giver
  • Level 5 – Adamantium Skeleton
  • Level 6 – Toughness
  • Level 7 – Locksmith
  • Level 8 – Demolition Expert
  • Level 9 – Heavy Gunner
  • Level 10 – Medic

Level 11 – 20

From levels 11 to 20, you will invest in more damage perks and crafting. With Gun Nut 2 and Armorer, you should be able to upgrade your weapons and armorer to help with survivability.

Here’s a list of the best perks to select from levels 11 to 20 with the Demolition Expert Build Guide in Fallout 4:

  • Level 11 – Commando 2
  • Level 12 – Bloody Mess
  • Level 13 – Locksmith 2
  • Level 14 – Demolition Expert 2
  • Level 15 – Gun Nut
  • Level 16 – Heavy Gunner 2
  • Level 17 – Armorer
  • Level 18 – Locksmith 3
  • Level 19 – Gun Nut 2
  • Level 20 – Save

Level 21 – 30

From levels 21 to 30, you will add more survivability perks because the game should get significantly harder at level 25 or higher. At these levels and beyond, enemies you encounter will be more dangerous, and survival is key.

Here’s a list of the best perks to select from levels 21 to 30 with the Demolition Expert Build Guide in Fallout 4:

  • Level 21 – Commando 3 + Heavy Gunner 3
  • Level 22 – Demolition Expert 3
  • Level 23 – Toughness 2
  • Level 24 – Life Giver 2
  • Level 25 – Adamantium Skeleton 2
  • Level 26 – Medic 2
  • Level 27 – Steady Aim
  • Level 28 – Steady Aim 2
  • Level 29 – Bloody Mess 2
  • Level 30 – Scrounger 2

Level 31 – 40

From levels 31 to 40, you will invest in heavy damage and crafting perks. You should start feeling very powerful if you have the correct weapon. Remember, you will want automatic, explosive rounds (mod) or heavy guns to do the most damage. Specific guns do stack damage amplifications, so attempt to find them.

Here’s a list of the best perks to select from levels 31 to 40 with the Demolition Expert Build Guide in Fallout 4:

  • Level 31 – Toughness 3
  • Level 32 – Adamantium Skeleton 3
  • Level 33 – Medic 3
  • Level 34 – Demolition Expert 4
  • Level 35 – Commando 4
  • Level 36 – Heavy Gunner 4
  • Level 37 – Gun Nut 3
  • Level 38 – Armorer 2
  • Level 39 – Gun Nut 4
  • Level 40 – Armorer 3

Level 41 – 50

In the final levels up to 50, you will see an increase in survivability, with the highest damage perks unlocked. Fallout 4 doesn’t have a level cap, so consider getting bobbleheads and advancing intelligence. You can gain the Science perk and craft even better weapon and armor mods beyond these levels.

Here’s a list of the best perks to select from levels 41 to 50 with the Demolition Expert Build Guide in Fallout 4:

  • Level 41 – Bloody Mess 3
  • Level 42 – Armorer 4
  • Level 43 – Scrounger 3
  • Level 44 – Toughness 4
  • Level 45 – Scrounger 4
  • Level 46 – Save
  • Level 47 – Heavy Gunner 5 + Bloody Mess 4
  • Level 48 – Toughness 5
  • Level 49 – Commando 5
  • Level 50 – Medic 4

Gear, Weapons, Armor

Fallout 4 Ghoul Slayer's Heavy Incinerator weapon
Fallout 4 How to Get Cryolator

The best items for a Demolitionist Expert build are the Cryolator, Incinerator, and Spray n’ Pray. The Cyrolator is a heavy weapon obtained during the prologue and is powerful throughout the game. Incinerator is the best area-based explosive weapon, and Spray n’ Pray unique effect allows it to use three perks. Moreover, look to obtain combat armor, modify it with padding, and strengthen it to help with survivability.

Cryolator – During the prologue, you can use Dog Meat to grab this item from a locked area and use it as an instantly powerful heavy weapon. Ammunition will be challenging, but follow our quest guide for a considerable advantage starting the game.

Incinerator – when it comes to massive explosive, area-based damage, it is your best weapon. Unlike the Big Boy, this weapon is easier to avoid friendly fire and has multi-kill potential. You can obtain an Incinerator by completing the Crucible quest.

Spray n’ Pray – while Spray n’ Pray seems weak, it has explosive rounds doing AOE damage, thus using Commando, Bloody Mess, and Demolition Expert perks. You can upgrade the weapon with Gun Nut to increase its effectiveness, making it one of the best weapons because of its passive explosive rounds. You can obtain this weapon from Vault 81, in the southwest corner of the map near Oberland Station.

Combat Armor – using your armor perk, make sure to mod your armor with Strengthened in legs and arms for reduced limb damage. Moreover, padding or dense should be used in the chest to reduce damage from explosives.


Curie is the best companion for the Demolition Expert build. This robot will largely stay out of your way in combat, thus avoiding friend fire or explosives nearby. Moreover, it will unlock a vital companion perk called Combat Medic once max affinity is reached. Gain +100 Hit Points if current Hit Points are below 10% of the maximum. This perk from Curie will help increase your survivability in critical moments near death with little downside. An alternative is to use Dog Meat and take 3 points into the Charisma perk Lone Wanderer.

The companion Curie can be unlocked in Vault 81 after completing the Hole in the Wall quest. Vault 81 is in the southwest corner of the map, south of Oberland Station. Complete the initial quest, max its affinity, and unlock the passive perk to help with survivability.

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