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How to Build a Soundproof Generator Box [7-Step Guide]

Silent Home Hub How To Build A Soundproof Generator Box

Do you hear a lot of humming noise? That’s probably your generator running in the background.

Generators are handy when there are power outages. One can power your home in no time.

You’re free to continue with your daily tasks without any interruptions! But its loud roaring sounds can definitely wake your entire neighborhood.

So can you make your generator quieter? YES YOU CAN.

By knowing how to build a soundproof generator box, you don’t have to live with the loud noise every time you use it.

Here’s a guide on how to build a soundproof generator box! It won’t even take an entire day.

Table of Contents

Which Materials Are Best for Generator Soundproofing?

Couple preparing materials

Before you start to build a soundproof box to help make your generator quiet as a cricket, you’ll have to prepare your tools and materials.

Whether you plan to build a collapsible, permanent, or portable box, these are the essential materials you’ll need for the BEST soundproofing and sound absorption:

  • Paper and Pencil
  • Measuring Tape
  • Ruler
  • Table Saw
  • Screw and Nails
  • Screwdriver and Hammer
  • Medium Density Fiberboard – Plywood or Fiberboards
  • Mass Loaded Vinyl
  • Acoustic Foam Mats, or Regular Foam
  • Green Glue, Acoustic Caulk, or Sealant
  • Vents
  • Ventilation Ducts
  • Hinges
  • Receptacle Boxes
  • Drill

For the body of the soundproof box, it’s okay to use plywood. Especially if you’re having a hard time looking for Medium Density Fiberboards.

But do note that MDF and Fiberboards provide BETTER soundproofing than plywood.

You can also use regular glue or sealant to secure the body of your box. But using Green Glue or Acoustic Caulk is MORE effective at soundproofing your generator box.

Some prefer to have a portable generator box. Especially if they do a lot of outdoor or camping activities!

Generator boxes tend to be heavy making them difficult to carry around. Its heavy weight adds to the generator noise level as well.

To remedy that, you can always add these materials to your soundproof box to make it more convenient!

  • Preferred wood of choice
  • Four wheels 
  • Lever

Start Building the Soundproof Box!

Couple Starting the Building Process

After you’ve prepared your materials, it’s time to get started and build your very own soundproof box.

You can build your soundproof generator box WITHOUT taking an entire day, and the steps are easy to follow.

Before you begin, take note there are FOUR KEY PROCESSES you’ll need to prepare for:

  • Taking down measurements
  • Cutting your materials
  • Installing materials
  • Assembling all the pieces of the box

Step 1: Take Measurements

Measuring Tools

Before you get started with the actual building process of your noise reduction generator, you need to know what SIZE your soundproof generator box should be.

You can even consider this step as vital to the success of your project.

This is because all your other materials are based on the measurements you’ll take now.

How to Proceed With This Step:

  1. Using a ruler or measuring tape, start by measuring your generators’ depth, height, length, and width.
  2. Make sure you ADD SEVERAL INCHES to your measurements for the materials you’ll use for soundproofing and ventilation.
  3. To help you make accurate measurements, take note of all your measurements on a piece of paper. Doing this will guide you with any measurements you’ll have to take in the next steps.

If you’re unsure of whether you took down the proper measurements, take your time. Repeat the process several times if you have to. 

Step 2: Cut the Medium Density Fiberboards, Plywood, or Fiberboards

Medium Density Fiberboards, Plywood, or Fiberboards

Your measurements should be ACCURATE as that will be the basis while making the box for your generator.

Once you’ve got your measurements done, it’s time to cut your Medium Density Fiberboards (MDF). You can also use plywood, fiberboard, or whichever material you plan to use for your box.

How to Proceed With This Step:

  1. Using your saw, make sure to cut it based on the size you took note of in the first step. 
  2. Don’t forget to label every piece you’ve cut, so that you know which part goes to what position.
  3. Take note of whether it belongs to the base, sides, or the ceiling. Moving forward, this will help prevent any confusion as to where each part belongs. You DON’T want to mess up this part, because you might attach one of the pieces to the wrong part.

Step 3: Cut Ventilation Holes

Drilling ventilation holes

This next step makes sure your soundproof box has enough ventilation.

Since generators run on gasoline, you’ll need vents to help exhaust the fumes it generates.

IF YOU SKIP THIS STEP, you’ll run the risk of your generator overheating and causing unwanted fires. Not only that, but you’ll have one ineffective noise reduction box.

Generators produce a good amount of heat. They can heat up pretty quickly when it doesn’t have enough ventilation.

Ventilation makes sure your generator boxes work correctly and won’t overheat anytime.

Don’t worry, because cutting these holes for your soundproof box is easy.

How to Proceed With This Step:

  1. Get started by taking down the measurements of your ventilation duct. Take note of the measurements as well. Start cutting your medium density fiberboard, plywood, or fiberboards based on the size you’ve taken. 
  2. Note you’ll be needing medium density fiberboard cutouts for this step. You’ll need the first cutout on top of your box. The second cutout will be placed on the side of the generator.

Depending on your preference, you can position the ventilation holes anywhere you like.

What matters is you make sure to provide good airflow to prevent your generator from heating up, while being able to reduce sound from the box.

NEVER forget to put in the vents and ventilation ducts on your provision for your generator quiet box to have a steady supply of air.

Step 4: Install the Mass Loaded Vinyl As The First Layer

Mass loaded vinyl

You can use Mass Loaded Vinyl (MLV) to soundproof your generator box.

Mass-loaded vinyl insulation is always ideal to use because of its EXCELLENT sound-absorbing qualities.

Whatever the case, the most important thing you’ll need to remember is that having MORE layers of mass loaded vinyl is vital in having an effective soundproof box.

How to Proceed With This Step:

  1. Mass loaded vinyl insulation is needed as the first layer for the installation process. Make sure to cut your MLV’s similar to the size of its MDF board counterpart.
  2. Caulk the first layer with green glue or any sealant. Though, using green glue is highly recommended for more effective soundproofing. It can significantly reduce sound waves your generator-quiet-box emits. Not only that, but you’re assured your pieces won’t separate from each other in the long run.

Regardless of the materials you’ll use, make sure you can SECURELY GLUE the first layer of MLV to the MDF.

A great tip to remember for this step is to also apply some green glue on the edges of each mass loaded vinyl piece you have. This adds more security and stability to your materials. 

Step 5: Install A Foam Mat As The Second Layer

foam pad

After the first layer of soundproofing, the LAST installation process involves using foam or acoustic foam mats.

Foam mats can help insulate and soundproof the box for your generator. It’s CRUCIAL to choose a material that provides better soundproofing.  

If you want to make sure your generator enclosure blocks the sound better, acoustic foam mats provide better sound insulation than regular foam.

This makes it ideal to use for soundproofing projects.

Using regular foam, though, should be enough if you can’t find any acoustic foam mat available.

How to Proceed With This Step:

  1. Start by cutting your foam mats based on the size of your MDF board. Don’t forget to take note of which foam belongs to the corresponding board size.
  2. Once you’re done with this, attach the foam to the interior of your MDF board. Join them using green glue to help with sound insulation.
  3. Like Step 4, don’t forget to secure the edges of your foam to your MDF board. This will help secure the pieces in place and have a stable DIY generator enclosure.

Step 6: Install the Ventilation Ducts

Ventilation Ducts

Now that you know the importance of having proper ventilation for your soundproof generator box, it’s time to install the actual ventilation duct.

How to Proceed With This Step:

  1. Place your ventilation duct into the ventilation holes you measured in step 3. Also, don’t forget to secure it properly.
  2. Some people often take this step for granted, failing to realize that even a ventilation duct plays an essential role in the soundproofing process. If you don’t secure your vents properly, it could affect the ventilation of your generator quiet box and its soundproofing abilities. You might end up having a box for a generator that can’t insulate sound properly, and that would be useless.
  3. As a last step for the whole installation process, don’t forget to install the vent on the opening of your box. When you install the ventilation duct appropriately, it puts you away from having any unwanted fire or other dangerous situations. 

Step 7: Put the Box Together

Assembling Wooden Box

Now that you’ve cut and installed the pieces together, it’s time to put your soundproof generator box together.

BEFORE YOU GET STARTED, make sure that the Green Glue has dried.

How to Proceed With This Step:

  1. Once dry, take your MDF board together and put them where they belong. You can use the notes you’ve taken in the previous step, to guide you where each part belongs. 
  2. This step is CRUCIAL because you’ll finally have to assemble the pieces as one. Note you can’t repeat this part.
  3. Once you’re done, start screwing your MDF boards in place. Install the hinges so that you can easily open your DIY generator box without any problem.
  4. If you notice any gaps in some parts of your box for a generator, don’t screw your pieces in place yet. Instead, apply some Green Glue along the edges of the pieces where you find the gaps.

Don’t worry because Green Glue is an effective soundproofing material that can stop sound from escaping the box for a generator through the openings. 

Optional Step 8: Install the Wheels and Lever

Rolling Wheels

After completing and building a soundproof generator box, it’s time to install the wheels and lever to make it a portable generator box.

Some people prefer having a portable soundproof box because of its convenience.

This is especially true for people who engage in A LOT of outdoor or camping activities. They can easily bring their generator around, without worrying about not having any power supply.

How to Proceed With This Step:

  1. On the bottom of your box screw in place your wheels. Use thick and durable wheels that you can use in any terrain. You don’t want to risk your generator falling and crashing while you’re transporting it. 
  2. After you’ve secured them in place, attach a lever on the side of your generator box.
  3. Attach it securely so it doesn’t detach from your box when you pull it.

When choosing a lever, take careful note it can support the weight of your generator box.

Take note that not all generator types are the same. For example, generators that run on 3000 watts might be heavier than generators that are meant to be more portable.

How to Build a Soundproof Generator Box: Final Words

Final Thoughts - People Smiling

Today, nearly EVERY household enjoys the benefits of having a generator.

  • You have power reserved in case of power outages.
  • Even in cases of a storm or other unforeseeable circumstances.

The only down part in using these powerful tools is the amount of noise it makes. 

Now that you know how easy it is to make a one-of-a-kind soundproof generator box, it’s time to get started!

The materials are easy to find, and it won’t take you the entire day to build a soundproof box for a generator.

Make sure to follow the easy steps provided above, and you’ll have your soundproof generator box in no time.

After building a soundproof box, you can start enjoying your generator when the need arises, without worrying about the loud generator noise it creates.

FINAL TIP: If you want to achieve an even quieter experience, we also recommend investing in quieter propane generators for the best results.


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About the Author


Andrea has always been bombarded by the hustle and bustle outside her home. Living in the city doesn’t get any quieter. The never ending noise from construction, traffic, and dogs barking on the streets day in and day out drove Andrea to a breaking point.

For 3 years, Andrea committed herself to studying DIY hacks, performing soundproofing experiments, and installing noise-free solutions. Now, she lives a quiet life free of the stress from noisy environments.

She hopes to share this knowledge so that others don’t have to endure the noise reigning in their ears and live a peaceful, stress-free life.