An Ultimate Guide To Build Your Indoor Grow Room 

Indoor Grow Room

A grow room can increase your indoor farming business manifold. 

The indoor growing industry is set to reach a market size of $44.3 billion this year alone, and with an indoor grow room, you can earn big from this already booming sector. 

That’s because indoor growing has made marijuana plantations possible in just about any weather condition, be it a desert or a snow-white field. And as more states are legalizing medical and recreational cannabis, indoor grow rooms are the key to this market. 

You see, marijuana is a temperamental plant that needs a special climate to provide high-quality yields. So you need to create the right conditions, including perfect temperature, moisture, soil, lighting, etc., to have the best crop, which isn’t possible outside a grow room. 

A grow room is something you can build almost anywhere in your home; it can be the basement, garage, spare room, or even closet. However, things can get tricky for you when it comes to building one and creating the desired conditions. 

That’s precisely why we’ve compiled this step-by-step guide to help you build your indoor grow room, so let’s dive in. 

Common Places To Build An Indoor Grow Room:

#1. You can build your indoor growing facility in the basement 

Are you planning on building an indoor grow room? 

If yes, your basement is ideal for building a growing facility, as it is a well-insulated enclosure. 

Since your basement keeps cooler in the summers and warmer in the winters, you don’t need to use HVAC systems intensively. 

The sounds and smells from a growing room can be an irritant for you and your neighbors. However, you can easily confine the noises and odor in the basement compared to other locations in your home. 

The only issue with basement grow rooms is high humidity, but you can easily control that using dehumidifiers. 

Amazing, right?

#2. Your indoor grow room can be in the garage

If your home lacks a basement, the garage is an option you can consider to build your grow room. 

But, unlike your basement, building an indoor cultivation room in the garage can be really tricky. 

Firstly, your garage can get too warm or cold depending on the weather outside. So you’ll have to use cooling or heating systems more frequently than in the basement to regulate the temperature.

Secondly, concealing the noises and smells is much more difficult in the garage compared to the basement.  

Nevertheless, you can run your grow room operations from the garage hassle-free by installing heavy-duty HVACs and noise-proofing systems. 

#3. You can even have one in the closet

You might be short on space or looking for a small-scale plantation. 

But can you build a mini indoor grow room?

Yes, you can. 

You can build a grow room right in your closet or wall cabinet; ventilating the space well and reducing the smell is all you need to do.

In fact, you don’t even have to install climate controls if your home has an in-built HVAC system. 

There you are with your closet grow room. 

Things To Consider When Building An Indoor Grow Room 

indoor grow room

Building a grow room isn’t easy as you’ve to factor in many things

A grow room isn’t just a place where you put your plants, as there are a dozen other factors you need to consider too. For instance, you have to choose a place where you can provide your plants with the required grow room ambiance. 

So you should consider building your grow room near a source of water, like a faucet, since connecting your plantation to the water supply is a prerequisite. Similarly, you need to install grow lights for plants, air conditioning systems, humidifiers, etc., which means your grow room must have a power strip or outlet nearby.

There are many other things you need to consider when building an indoor grow room, so let’s have a look at them. 

#1. Determine the size of your room

Did you know that you can take your grow room business to success no matter its size? 

In fact, many indoor growers have increased their yields and scaled up their business in small to medium-sized grow rooms. 

However, there are a few things you need to remember when deciding the size of your grow room.  

For instance, you need to have adequate space for the plants and an area for you to comfortably work around them. Also, you’ll have to create enough room for installing the equipment needed to create the right grow room conditions.  

If you are a beginner or hobbyist, an indoor grow room of size 2x2x4 or larger should be sufficient, meaning you can build your grow room in a spare closet or store room. 

Interesting, isn’t it? 

#2. Your indoor grow room should have the right flooring

Once you’ve figured out the size of the grow room, your next focus should be the floor, especially the kind of flooring materials that you use. 

For your indoor grow room, you should choose a flooring material that is sturdy, humidity resistant, and easy to clean. 

You might think about using basic concrete flooring, given it is strong and long lasting, but concrete can be counterproductive to indoor growing. 


You see, concrete floors are highly porous and soak up moisture, plantation chemicals, etc., that they then release into the air. That creates bad conditions for the plants in your grow room and affects the overall yield. 

So how to make the flooring right? 

The solution is simple, you can cover the concrete with rubber deck tiles, as they’re sturdy, easy to maintain, and highly resistant to moisture and humidity. Also, you can apply paint or any other water-resistant coating on the concrete surface to help fix the problem. 

There you have it, the perfect flooring for your grow room. 

#3. Create the perfect grow room temperature

For your cannabis plantation to have better quality and high volume yields, you need to create the right temperature conditions, ideally between 75 and 85 degrees Fahrenheit. Further, you should be able to adjust the temperature as per your plantation’s needs. 

If you’re building your indoor grow room in a closet or spare room, maintaining this temperature range and regulating it shouldn’t be a problem. 

But that’s not the case with large-sized indoor grow rooms built in the basement, garage, etc. That means if you are planning on building your grow room at such locations, you’ll have to install air-conditioning or heating systems depending on the climate in your region. 

#4. A grow room should have balanced humidity 

indoor grow room

You need to create the perfect ambiance for your grow room

When you are looking to create ideal grow room conditions, humidity is something you shouldn’t ignore, as marijuana plants need moisture for proper growth. 

So you should always install a humidifier along with temperature control systems to ensure it never gets too dry inside. 

And here’s a catch you should remember while using humidifiers in your indoor grow room: 

Low humidity levels mean your plants soak up excess water and salts at the roots. At the same time, highly humid conditions can lead to the formation of fungi on the leaves and buds of your plants. 

Also, uncontrolled moisture can lead to crop failure since your plants won’t grow as large or yield as much as they would normally. 

You don’t want your plantation to be affected by unbalanced humidity. Do you? 

That’s precisely why you should aim to maintain balanced humidity levels to maximize the growth of your indoor plants. 

#5. Proper ventilation is key to indoor plantation 

While building your indoor grow room, you should ensure the place is well-ventilated by installing ventilation systems. 

You see, a lack of adequate airflow in the room will deplete carbon dioxide levels and lead to excessive humidity fluctuation, both of which harm your cannabis plants. 

So how exactly can you ensure continuous airflow in the grow room?

Maintaining proper ventilation around the indoor plantation is fairly simple; all you’ve got to do is install some high-performance duct fans.   

You may doubt the need to install ventilation fans since you’re already using artificial climate control systems. However, you need to install them unless your indoor growing facility is well ventilated, with enough airflow in and out of the room.

A good ventilation unit, and you can rest assured of pant safety. 

#6. Ensure your grow room is at a safe location

Your cannabis plantation, be it for medical or recreational purposes, has to be at a safe location. That’s because there are always chances that someone might misuse marijuana plants for illegal purposes. 

Also, your pets or even stray animals may find their way to the grow room and harm your plants.  

So you should build your indoor grow room in a place no one can access without your prior knowledge. Further, you can even install smart locking systems to ensure the hydroponic room is accessed only by you or the people you’ve allowed. 

#7. Choose the right lighting for your grow room

LED grow lights

You should always install LED grow lights in your grow room

Lighting is one of the most important grow room factors, as it can either make or break your indoor farming business. 


You see, traditionally used lighting materials like HID lamps are highly energy-intensive, which can skyrocket your utility bills. These lamps also generate a lot of heat, which means more intensive use of HVAC systems in the grow room. And the worst part is that excess heat from the HIDs can harm the pants themselves. 

You’d surely want to have a better alternative for your indoor plantation. Won’t you? 

LED grow lights offer you the best recourse since they consume less than half the energy as HID lamps and generate near zero heat. So the benefits are twin-fold, as you save energy and your plants stay protected from heat. 

And the best is that you can become eligible for rebates up to 90 percent of the LEDs price.

That sounds impressive for sure, doesn’t it? 

Indoor Grow Room: FAQs

#1. Is a grow room legal in the US?

Whether or not a grow room is legal depends on your state and its local laws. And as of now, all states except sixteen have legalized weed in some form. 

For instance, seven states, including California and Washington, allow licensed weed growing for recreational purposes, while others have restricted it solely to medical purposes.

However, as indoor growing offers a booming business, more states are likely to open their markets for the same. 

#2. Do you need a license to build a grow room?

Be it for recreational or medical purposes, you need to get a cultivation license to build a grow room. And the licensing process differs for different states. 

But you should keep in mind that a grow room license is hard to obtain in general, and it requires you to fulfill an exhaustive range of criteria. 


An indoor grow room offers a promising business, especially in the medical sector, where the FDA has already approved cannabis-derived and cannabis-related drug products.

At Eco-$mart Inc, we are experts at building indoor grow rooms with eco-friendly construction materials. Our grow room products and services like LED grow lights, insulated metal wall panels, noise-proofing, etc., are market renowned. 

So, if you are looking to build a grow room, we can help you out. 



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