How to Build a Grow Room: The 9 Step-by-Step Guide 

how to build a grow room

If you’re interested in growing your own cannabis, you’re going to need a grow room. This is where you’ll control the environment and create the perfect conditions for your plants to thrive. Building a grow room can be tricky, but don’t worry – we’re here to help! In this article, we’ll walk you through the step-by-step process of how to build a grow room from scratch. We’ll give you tips on picking the right space, choosing the proper equipment, and setting up your grow area. So, read on and get started today! 

Building Your Indoor Weed Growing Setup 

Building an indoor grow room is no easy feat, but it’s definitely doable with a little bit of planning. However, before you embark on this project, it’s crucial to have everything on your indoor grow room supplies list in order. That way, you won’t find yourself stuck in the middle of the build with no equipment or materials. 

1. Choose the Right Space to Build A Grow Room 

The first step in building a successful grow room is choosing the right space. You’ll need to find an area that’s large enough to accommodate all your equipment and plants but not so big that it’s difficult to control the environment. Additionally, you should try to find a space with good ventilation and plenty of natural light.  

However, not all rooms are created equal. Some rooms, like basements and closets, tend to be too humid, which can lead to mold and mildew problems. If possible, try to find a room with plenty of air circulation, venting, or an air conditioner to help control the environment. 

Even if your grow space location isn’t perfect, that’s okay! Grow tents offer a great way to build a custom space that’s perfect for growing cannabis. These tents are lightweight, portable, and easy to set up, making them a great option for small grow spaces. Plus, they come in a variety of sizes to fit any need. 

2. Make a Complete Floor Plan of Your Cannabis Grow Room 

Now that you’ve chosen the perfect space for your grow room, it’s time to start planning the layout. This step is important because it will help you determine what equipment you need and where everything should go. 

To get started, grab a piece of graph paper and make a scale drawing of your grow room. Be sure to include all the doors, windows, and vents in your design. Then, start planning where you want to put your equipment.  

Some things to keep in mind as you’re planning your layout: 

  • Keep in mind that full grown plants can get pretty big, so you’ll need to leave enough room for them to grow.  
  • Ensure you have enough space for all your equipment and have easy access to it. Place it in a convenient location. 
  • Try to keep your grow area as close to the ventilation system as possible. This will help ensure that your plants get plenty of fresh air. 
  • Make sure you have enough electrical outlets for all your equipment. 
  • Try to create a workflow that’s efficient and easy to follow. 
  • Consider using grow tents or other enclosures to maximize your space. 

Your floor plan should be as detailed as possible. Once you have a good idea of what you need and where everything will go, it’s time to set up the various grow room components. 

3. Make a Lighting Plan for Your Grow Room

One of the most important grow room design tips is ensuring your space is lightproof. Cannabis plants need complete darkness to flower properly, so you’ll need to block out any and all light leaks. The best way to do this is by using blackout curtains or blinds. However, if you’re using a grow tent, you won’t need to worry about this step since the walls are already lightproof. 

Another way to lightproof your space is by using reflective materials like mylar or white paint. These products will help reflect any stray light back onto your plants, ensuring they get the darkness they need. 

Setup Grow Lights & Timers 

Cannabis plants need a lot of light to grow, so you’ll need to set up some powerful grow lights. Additionally, you’ll need to install a timer, so the lights turn on and off automatically. Depending on the size of your grow room, you may need more than one light. Fortunately, there are a variety of grow lights available on the market, so it’s important to do your research and choose the best option for your needs. Common types of grow lights include: 

Once you’ve selected the perfect horticultural lighting system, it’s time to install it in your grow room. Be sure to mount the light at the correct height so your plants can get the light they need without being burned. Also, ensure the light is properly secured, so it doesn’t fall and damage your plants. 

To ensure you’ve placed it at the optimal height, consider the following tips: 

  • For fluorescent lights, place them about six inches above the plant canopy. 
  • For HID lights, place them 30-36 inches above the plant canopy (depending on the wattage). 
  • For LED lights, place them 18-24 inches above the plant canopy. 

After your grow light is installed, it’s time to connect it to a timer. This will ensure your plants get the right amount of light each day and help prevent them from getting too much or too little light. 

Add Reflective Material to Walls & Ceiling 

In addition to light proofing your grow room, you’ll also need to add reflective material to the walls and ceiling. This will help reflect light back down onto your plants, ensuring they get enough light to grow.  

There are a few ways to achieve this: 

  • Mylar sheets: If you’re using mylar, simply attach it to the walls and ceiling with adhesive or tape. Then, be sure to smooth out any wrinkles or bubbles so the light can reflect evenly.: If you’re using mylar, simply attach it to the walls and ceiling with adhesive or tape. Then, be sure to smooth out any wrinkles or bubbles so the light can reflect evenly. 
  • Panda or Poly plastic:  Black on one side and white on the other. Non-see through.  
  • Paint: If you’re painting your grow room, be sure to use high-quality white paint. This will help reflect light more effectively than a standard paint job. 
  • Foil: Foil is another great option for reflective material. Simply attach it to the walls and ceiling with an adhesive and smooth it out.  

Additionally, using grow light reflector hoods is a great way to increase the amount of light that’s being delivered to your plants. 

4. Ensure Air Filtration of Your Indoor Growing Room 

To create a healthy growing environment, you must seal your grow room to ensure that the humidity and temperature levels remain consistent, which is essential for plant growth. The best way to achieve this is by using weatherstripping or caulking around doors and windows. You can also use a door sweep to seal any gaps at the bottom of your door. 

If you’re using a grow tent, you won’t need to worry about this step since the walls are already light and airtight. However, it’s important to make sure all the seams are sealed properly so no light can escape. 

Hydroponic plant in HRG Dist warehouse

5. Install an Air Circulation System 

For your plants to thrive, they need fresh air. That’s why it’s important to build a grow room with an air circulation system. This will help ensure the air is being circulated properly and your plants are getting the oxygen they need. 

One option is to use a ceiling fan. This will help circulate the air and prevent hot spots from forming. Additionally, you can use oscillating fans to help circulate the air around your plants. 

Another option is to use a duct system. This will help ensure the air is being circulated evenly throughout the grow room. You can also use this system to control the temperature and humidity levels in the space. 

6. Install an Air Ventilation System 

Proper ventilation is essential for a successful grow room. Not only does it help remove heat and humidity, but it also helps circulate fresh air throughout the space. When setting up your ventilation system, be sure to place the exhaust fans near the top of the room so hot air can be removed quickly. Additionally, be sure to place the intake fans near the bottom of the room so fresh air can be brought in. 

It’s also important to make sure your ventilation system is properly filtered. This will help remove any contaminants or pests that could ruin your plants. The best option is to use HEPA filters, which are designed to remove 99.97% of all particles that are 0.03 microns or larger

Once you’ve installed your ventilation system, be sure to test it out to ensure it’s working properly. You can do this by turning on the fans and holding a piece of paper near the exhaust vents. If the paper is blown away, then you know the system is working properly. 

7. Install Insulation to Keep Heat In and Pests Out 

Insulation is another important element of a successful grow room. Not only does it help keep the heat in, but it also helps keep pests out. When choosing an insulation material, be sure to select one that’s fire-resistant and has a low water absorption rate. Additionally, be sure to choose a material that’s easy to install so you can do it yourself. 

One option is to use spray foam insulation. This material is easy to apply and will help create an airtight seal around your grow room. Another option is to use fiberglass batts. These are also easy to install and will help keep the heat in and pests out. These are also easy to install and will help keep the heat in and pests out. 

8. Setup Water & Irrigation for Your Grow Room 

One challenge you’ll face with growing indoors is watering your plants. Although you can always hand water your plants, it will be extremely time-consuming and isn’t quite as practical in a grow room environment. Setting up an irrigation system is crucial to keeping your plants healthy and growing to their full potential. One method you can use for your grow room is a drip irrigation system, but for larger operations, we always recommend using a bucket system

The benefit of using a bucket system is that the water pump will automatically feed water directly to the soil of your plants. You will only have to maintain the water pump and its fittings, rather than every part involved in a drip irrigation system. Once you’ve set up your buckets, water pump, and water treatment, the irrigation system will automatically water your plants – leaving you plenty of time to focus on all the other tasks involved with operating a grow room. 

9. Grow Room Safety 

With so much invested into your grow room setup, the last thing you would want is for any accidents to topple down your hard work. Here, we’ll discuss the best ways to keep your grow room and yourself safe. 

The biggest hazard your grow room and plants will face is fire. One of the top three causes of fires is electrical malfunction. To avoid becoming a statistic, follow these safety protocols to ensure that you keep your grow room and yourself safe: 

  1. Always have fire extinguishers ready and nearby. Perform regular training on how to use them. Invest in fire extinguishers that do not leave chemical residue that damages your plants. 
  1. Have smoke detectors installed in your grow space and perform regular tests on them every month. 
  1. Keep electrical wires properly insulated, extension cords away from any sources of water, and electronic devices in safe areas. Usually, all electrical wires are waist-height or above and all water reservoirs and tanks are below the waist-line. That way, they will not come in contact even in the event of a flood.   

Fires are not the only risk in a grow room. There are safety measures that one should take when interacting with a grow room. Follow these personal safety tips, and you’ll never need to worry about your grow room again: 

Single green hydroponic plant under grow light

Build a Grow Room with Help from HRG brands! 

Learning to build a grow room can seem like an overwhelming endeavor, but with our step-by-step guide, you’ll be an expert in no time.  

If you’re ready to get started, our represented brands carry everything from lights and fans to soil and nutrients, so you can get everything you need in one convenient place. Trust us, your plants will thank you! 

Find HRG Products at a Local Store 

Looking for more helpful tips on growing cannabis? Check out our blog for the latest information on everything from cultivation to product reviews.