homemade grow room for weed

I built and installed 4″ x 10″ x 48″ wooden housing for the duct work for the exhaust of the Cool Tube (picture 3rd down). Next, three 6″ duct flanges into the back wall of the cabinet leading into the duct work spaced vertically 9″ apart.

Final Harvest Weight: 264 grams (9.3 Ounces)

Of course I wanted to filter the intake air to keep out dust, pet hair, pollen, mold and the like.

Cost: $1.64/gram.

I chose a High Pressure Sodium bulb. Since these produce more light from the side(the long side as opposed to the plug and tip of the bulb), light coverage could be maximized by positioning them front to back. Some creativity was required to install the Cool Tube to keep my HPS bulb from becoming too hot.

This allowed three different height settings for the light. The unused two positions are capped off. Take a look…

After months pouring over cannabis related text and furrowing my brow at various nooks throughout my home, I saw through the problem. I would build a stealthy grow cabinet!

My sights set, I loaded Google's 3D rendering freeware, Google SketchUp, and got to work.

The solution I came up with was to place the duct work outside of the cabinet.

On Craigslist I found a cabinet kit still in the box for only $35. It came in at 24″ L x 30″ W x 70″ H. Next, I purchased a 6″ inline fan for another $100. The fan combined with a 400 watt light and Cool Tube from a previous grow gave me something to design around.

Sirius: This is definitely an advanced method of creating a grow box, but he makes sure to include a lot of things one needs to consider when creating one, such as ventilation and making sure to leave room for everything you need. Do you have a better/more practical/more efficient design? Let us know so we can share with the world!

Important: The opening for your intake hole should be about twice the size of your exhaust hole.

Also, I installed a "Kill-a-Watt" device to monitor my electrical usage so I can easily calculate the total extra cost to my electricity bill each month.

Affordable medicine is a right, and medicinal Cannabis sets a standard for patient autonomy. Enjoy producing your own medicine.

Keeping a door open is not a viable option for the stealthy gardener like me! I decided to use some creativity.

See Another Stealth Grow Cabinet in Action and Build Your Own!

Next to the fan room is space for other more technical things. Here we find the ballast and command switching station.

The day I got a recommendation for medicinal Cannabis was a relief. This was followed by the knowledge and urgency that I needed to get some plants in the ground immediately.

Momentarily discouraged, I quickly scrapped the idea of a dedicated room filled to the brim. I began with getting clear about my intentions; I wanted to inconspicuously and autonomously produce my medicine. This was a much more respectable and realistic goal, and one that I could embrace.

The first thing to deal with was the Intake and exhaust – a clean environment and fresh air for my plants.

A fan speed controller and light timer are mounted on the outside of the fan room.

The final bounty boasted nine ounces of dried and cured cannabis flowers.

This had been a long-time dream of mine, and I fondly imagined my first harvest, curing my flowers to perfection, and collecting their resin for concentrates. I saw myself carefully journaling their progress, and eventually becoming an expert caretaker of myself and my marijuana garden.

When all was said and done I harvested 264 grams (9.3 ounces).

I vented this area with a 4″ opening that opened into the fan room.

I installed a sealed fan room to house the 6″ inline fan mentioned above. This sat in the top inside of the cabinet, pictured below.

After the initial investment, $1.64 was my total cost per gram when I factored electricity, carbon filter, and nutrients.

Unfortunately, you cannot make them at home (unless you have experience with electronics), so you’ll have to buy them.

To build a grow tent, you will need wood, metal or plastic poles, and a plastic sheet.

With some minor differences, obviously.

Despite seeming like a hard task, identifying the circuit is really easy because the circuit breaker panel should have labels on it, helping you identify to which circuit belongs (either master bedroom, room #2, or whatever you wanna call it) and the amperage of said circuit.

When building your grow room, you can make it as big as you want to and out of anything you have available as long as you make it light-proof, air-tight and waterproof.

6. Ventilation.

Cannabis plants need CO2 to perform photosynthesis , which is vital for plant growth. During this process, plants take in water and CO2 and convert them to sugars by applying the energy they absorb from light so with good ventilation you are actually “injecting” CO2 into your grow room, providing what they need for this vital process.

Just remember that this is the max wattage the whole circuit can handle and not the max wattage one individual outlet can take!

A grow tent is the best DIY grow space because (depending on how you build it) you can easily disassemble it when you need to and then mount it again without needing anything else.

An air-tight grow room is a must when growing in places where cannabis is illegal, failing to contain smell (and light) in the tent can easily cause neighbors to report you to the police, so make sure you check this a couple of times throughout your growing cycles, as this can easily be fixed and will save your from a lot of headache.

When flowering, you need to provide a 12/12 light cycle, if there is a source of light near your grow room when the lights are turned off, that light might get in and stress your plants, making them revegetate or becoming a hermaphrodite.

Now, have in mind that it is possible for your oscillating fans to be too strong so always make sure that your fan is adjusted so it doesn’t stress or end up harming your cannabis plants.

The easiest ways of making it are with a metal ( wood or plastic ) structure and a plastic sheet covering it, or building a closet-like structure with plywood.

If you’re planning on using a heavy light fixture (or more than one) and an exhaust fan with a carbon filter, it’s better to use metal poles so the structure can bear the weight.

A grow room extractor fan usually goes on the top part of the grow space and is connected by a tube to the carbon filter.

3. Building your own indoor grow step-by-step.

Voltage x Amperage = Max Wattage.

So let’s say that the label says 15A and 220V; Now you have the information you need so it’s just a matter of applying it to the following formula :

You can build a good stealth grow tent as big as you want, with everything you need to, from the appropriate structure for the light fixtures to the exhaust fan and filter, and as long as you can accomplish the main requirements, you will have a fully functioning grow tent.

Tip: Even though it is not obligatory, you can glue pieces of rubber sheet where the plywood sheets meet and in between the door to make you maintain the temperature and humidity levels.

The plastic sheet should be measured on the grow tent before cutting so you don’t have to redo it, make sure it doesn’t have holes to avoid light leaks and if it doesn’t get too hot where you live you can use 2 layers of the sheet to make the tent more resistant.

Before starting to build your grow room, you need to have a couple of things in mind.

Calculating power capacity.

Proper ventilation also helps you maintain humidity levels on point because it is super important, especially during the flowering stage so by having a good ventilation system you can get rid of the excess moisture caused by the water the substrate retains and the moisture your plants release through transpiration.

As you may know, an indoor weed grow room allows us to control and adjust the temperature, humidity, and intensity of the airflow, because of this, your grow room must be air-tight.

Apart from having a grow room air conditioner, ventilation is the only way to keep the temperature down. Most growers that grow under LEDs shouldn’t have a problem with this but if you’re growing under an HPS for example, you’ll definitely need ventilation.

Have in mind that when making your own grow room or box you will have to make the holes where the duct tubing goes in and out.

After you have all the poles and connectors ready, you need to cut the plastic sheet.

First, you’ll need to cut and assemble the poles into something like this:

One of the 1x2m plywood sheets will need to be cut in half (for the door). You’ll also need 4 door hinges so you can open and close your grow box properly.

Unless your space is very well ventilated you’ll have to install an exhaust and, maybe intake fans too.

Creating a model of the grow room in paper will let you see what fits on different dimensions. Making it easy to make changes and test multiple distributions .

A light leak will let ambient light in, which can disturb the dark hours , photochrome imbalances cause damage to your plants and your potential harvest.


Building a grow room in a garage can be tricky due to the weather can spike temperatures changes in the space.

Aside from the physical space to build your grow room, you will need.

Height is also important, depending on the type of seeds you’re growing. For example, cannabis sativa can grow up to 6′ indoors, and sometimes even more. This is why there are specialized tents, like the Gorilla grow tent , that have a max height of 10′.

As long as you have space to work around the plants, the exact size doesn’t matter. For most hobby or novice growers, anything bigger than a 2x2x4 space should be adequate .

Be sure to place your grow room in an area where no one can get to it without your knowledge . And make sure is not accessible to pets or animals. Especially when plants are young, if something messes with them enough it can bring plenty of growth problems.

If the space where you build your grow room is too humid, the plants can develop different kind fungi on the leaves and buds .

Wall Cabinet Or Closet.

Light control is essential to the growth and outcome of your crop. If your plants receive too little light too soon, they will begin flowering before maturation in anticipation of the winter season.

Remove carpets or rugs, as they have the potential to leave bacteria, parasites, and other pathogens that can destroy your crop yield.

Cannabis plants need the right level of humidity. Otherwise, your crop will not grow as big or yield as much product as it would otherwise.

Another thing to figure out is where is the smell going? Can a noisy neighbor be a problem it smells in your surroundings? There are things you can do about cannabis odors (as do the best grow cabinets for discreet home use), and it’s something to keep in mind.

2. Building The Frame.

If you think your garage is the ideal space for a DIY grow room, a specially built grow box or a grow tent might be your best bet . So you will be better able to control the environment in a small enclosed space.

You want enough space for not only your plants in the grow room, but also the equipment needed to create the right environment for proper growth.

The more extra things you’ve got (i.e. rotating fan, dehumidifier, heating equipment) the less space for your plants as you need them to keep distance from most of these.

While a basement is ideal, there are other options for you. A spare closet or pantry cabinet might give you enough space to grow cannabis. You need a cabinet space of at least two feet high by two feet wide to provide room for growth.

Please be careful of hot lamps and other electrical devices not coming into contact with water or any material that could react to heat. And never coil up the reflector cables, they can heat up and be a real hazard.