how much does it cost to grow weed

Want to Setup a Marijuana Grow Room? Here are the Costs

With legal medicinal marijuana now available in 33 American states and D.C. , the industry is set for a golden age. In fact, there are so many commercial cultivators that states such as Oregon have a massive surplus. In 2017, the global legal marijuana industry was worth around $9.5 billion per annum; the United States accounted for 90% of it!

According to Grand View Research, the global market could grow to over $146 billion per year by 2025. The legalization of weed in Canada means that America will no longer have such a huge market share, but the industry will grow to unprecedented levels in the near future.

The Cannabis Business Plan website suggests that the average commercial operation has costs of $830,000 per annum! When you add in the heavy taxes on weed businesses, and difficulties finding a bank that will do business with you, cannabis-based businesses will find it tough to make their fortune.

If you live in a state where it is legal to grow weed at home, you don’t have such worries. What you need to determine is if your weed usage warrants a home grow. In this guide, we take a brief look at the cost of setting up an indoor marijuana grow room at home.

Building Your Grow Room


When it comes to setting up an indoor grow, it is best to keep it simple. It should go without saying that you must purchase feminized seeds , or use cuttings from a female ‘mother’ plant. If you purchase regular seeds, half of them will become male plants. While male plants have their uses, they will not grow the resinous, cannabinoid-rich buds that you want.

You can purchase seeds online for anywhere between $10 and $20 apiece. There should also be options to purchase 3-packs, 5-packs, and 10-packs at least. A 10-pack should cost 20% or so less per seed. A 5-pack is the most popular option (most states only allow you to grow a maximum of six plants) and will probably cost approximately $60.

Grow Tent

The simplest way to grow weed at home is to invest in a grow tent . They are designed specifically for growing marijuana, are easy to assemble, and will cause no damage to your property. A two by two-foot (2’ x 2’) tent will cost approximately $120 and can house a maximum of three plants.

A 3’ x 3’ tent houses up to four plants and could cost more than $200. Larger tents may cost over $300.


If you use a hydroponics setup , you must purchase an inert growing medium such as coco coir or rockwool, and are also responsible for ensuring that your crop gets all the nutrients it needs. The cost of the system itself depends on the ‘type’ you choose. For instance, a 12-plant watering system could cost over $500, but there are cheaper options for under $200.


A super soil mix can cost between $20 and $50, while there are also nutrient kits on the market for $80+. There is a school of thought that professional soil and nutrient mixes are a better option than natural plant soil because of fewer contaminants.

Lighting & Electricity

As your plants don’t get the benefit of sunlight when growing indoors, it is your responsibility to ensure they get all the light they need. During the vegetative stage, your plants should be exposed to at least 18 hours of light per day. It drops to 12 hours during blooming. There is a variety of grow light options which vary in price and power.

Compact Fluorescent Lights (CFLs) for example, are the weakest but are useful for small grow rooms and available from as little as $50 for 200 Watts, depending on the spectrum. HID and LED lights are more expensive but provide far more light. For example, a 140-Watt light could cost over $300, but is far more ‘energy efficient’ than CFLs.

When you add in extra costs such as a hood and ballast, a 1000-Watt setup could cost up to $600. Hopefully, you can produce a gram per watt. This would equate to just under 36 ounces.

Electricity costs are harder to calculate because the cost varies across the United States. The national average is approximately $0.13 per kWh. A 320-Watt LED grow light probably uses almost 6-kilowatt hours per day during the vegetative stage . In flowering, the same light uses almost 4-kilowatt hours a day. Overall, the cost of electricity for this single grow light is approximately $4 per week. For three lights and a 10-week grow, your electricity cost is $120.

Carbon Filters

Filters aren’t a necessity, but they clean the air and eliminate the smell of weed. Typically, you can expect to pay over $100 for a filter and duct fan combination. You also need clip fans to keep your grow tent closed and circulate the air inside; they cost approx. $30.

Other Equipment

If you are using soil, it is also necessary to purchase different sized pots. When your plant grows, you have to transport it to a larger pot. You also have to purchase soil. There is also the option to buy hardware such as stakes, zip ties, anda screen if you are going to attempt the Screen of Green (SCROG) or Sea of Green (SOG) growing methods.

We also recommend purchasing a pH testing kit. If your crop’s growing medium is outside the 6.0 to 6.8 range (5.5 to 6.5 for hydroponics), the ability of the plants to absorb nutrients will be compromised. There are decent pH testing kits for just $20. You should also invest in a digital timer for around $25. They ensure that your plants are growing on the right lighting schedule.

As temperature and humidity play such a crucial role in growing marijuana, purchase a thermometer and hygrometer, or an all-in-one device. They are available for just $10. If you live in an area where the water isn’t suitable for weed, consider buying a reverse osmosis system to purify the water. The cost ranges from $150 to thousands of dollars.

Labor Costs

How long do you spend tending to your marijuana plants? Compare it to how much you are paid for working per hour. Even if it works out at around $20 a day, that equates to $1,400 during a 10-week grow.

Final Thoughts on Setting Up a Grow Room

If you choose the most basic of setups, you can begin growing marijuana at home indoors for under $2,000. The main benefit is that you can enjoy several harvests each year, and most of the equipment you purchase can be used over and over again. Smaller setups might produce 200 grams which works out at around $10 a gram.

Although it depends on the strain, you should be able to find weed for that price or less at a dispensary. It is when you grow cannabis on a larger scale (within the limits of the law) that you see the real benefits. Let’s say you spend $4,000 on your setup during the year but produce approximately 1,000 grams of marijuana. At $4 a gram, you are definitely winning, especially if you need weed for medicinal purposes .

Incidentally, Canadian companies are selling ‘starter kits’ for under $500. They consist of a 2’ x 2’ grow tent, nutrients, pH drops, a digital timer, clip fan, adjustable hangers, lighting, and CO2 bags. You also have to factor in the cost of electricity, but that is an exceptional deal.

There are more complex kits on the market from $1,000+. If you grow marijuana, you get to learn so much more about the plant than if you only ever buy from a dispensary. You will ‘feel’ closer to the cannabis, and of course, it is a great story to tell your friends!

We take a look at how to set up a grow room for cannabis, and how much it is likely to cost. Here's everything you need to know and more.

The Cost Of Growing Cannabis Indoors, And How To Control It

How much does it cost to build and run an indoor grow room/tent? Here’s the scoop on the cost of growing your own weed indoors.


Growing cannabis indoors has a lot of advantages. It provides you with total control over your plant’s environment. It’s discreet, and it gives cannabis lovers without outdoor gardens a chance to connect with the amazing plant.

Unfortunately, there’s one seemingly big downside to indoor growing: the cost. That being said, it’s not nearly as much of an issue if you’re aware of, and prepared for, said costs. Read on for an in-depth breakdown of what you’ll have to pay to grow in an indoor tent/room. We’ll also teach you how to keep those costs minimised and get the most for your money.

The Average Cost of Building an Indoor Grow Room

To build a proper indoor grow space, you’ll need a grow light, an exhaust system, fans, and a grow tent. Costs build up here, but the best of these products will save you lots of money as time goes on.

Grow Lights

The grow lights are the heart of your grow room, and will have the biggest impact on the growth of your plants, and, ultimately, the size and quality of your harvest. The 3 most commonly used grow lights among cannabis growers are:

Fluorescent Lights:
  • Cheap and available virtually anywhere.
  • Great choice for hobby gardeners working with a limited amount of space.
  • Produce smaller yields than HIDs or LEDs.
High-Intensity Discharge (HID):
  • Higher yields than fluorescent lights.
  • Only around 25–30% of the energy is emitted as light. The rest is emitted as heat (requires additional exhaust system and fans).
Light Emitting Diodes (LED):
  • The most energy-efficient lights on the market
  • Long-lasting
  • Don’t emit nearly as much heat as HID lights.
  • Most expensive option

To produce the best possible yields, we recommend you provide your plants with at least 400–650 watts of light per square meter. So, if you’re working with a 2m² grow tent, you’ll want to invest in at least an 800W light. Depending on the make and model, those will set you back between €80 and €170. Some options include the classic 1000W HPS bulb and the HELESIN 1000W LED Grow Light.

Air Circulation (Exhausts, Filters, and Fans)

Proper air circulation is nothing short of vital when growing cannabis. Without fans and/or exhausts to move air in, out, and around your grow room, stagnant air will build up around your plants, driving up the temperature and humidity while simultaneously creating a breeding ground for pathogens. Regardless of the size of your grow space, we recommend investing in some kind of fan to help move air around your indoor garden.

Fans are relatively cheap. This 40cm wall mount fan (perfect for a small grow tent), for example, is less than €40. Inline fans and exhaust, on the other hand, are a little more expensive. A couple of other options for small rooms and grow tents include the Calimaero 100m inline fan, and the Hon&Guan 125mm inline fan.

Grow Tent

Grow tents offer an affordable way to create the perfect microclimate for your plants without having to refurbish an entire room of your house. Thankfully, they also come in a number of sizes and at various price points.

What size tent you choose to buy is obviously up to you. However, most growers tend to use tents between 1–3m² in size, depending on the space they have available and how many plants they want to grow at a time. Some great options include the Costway Grow Tent, the Secret Jardin 120×120 cm Grow Box, the RoyalRoom 150x150x200 cm Grow Tent, and the Secret Jardin 240×120 cm.

If you’re really on a budget, consider building your own grow tent. Check out this article for a simple walkthrough on how to build your own DIY grow tent in just 3 steps.

Room Refurbishments

If you’ve got the space and budget, you might be looking to refurbish an entire room dedicated to your plants, rather than limiting yourself to a tent. If that’s the case, calculating the costs of these refurbishments is tricky, as they’ll vary depending on how much materials you’ll need, and the price of those materials in your area.

First off, to maximize the light given off from your grow lights, you’ll want to use reflective material on the walls of your room. White paint does a pretty good job at reflecting light, but specialized grow film and mylar tend to boast higher reflectivity.

Concerning airflow, properly ventilating large rooms is going to take large inline/exhaust systems and fans. Installing these systems might also call for longer ducts and the help of a professional. In turn, a bigger room may encourage you to grow more plants at a time. This means you’ll be working with a bigger canopy that’s going to need more light.

Other Costs to Consider

Besides your lights, fans/exhausts, and tent, you’ll also need to invest in a bunch of smaller, cheaper equipment to grow weed at home. This could include fabric pots, materials to make your own soil, and, of course, cannabis seeds. You’ll also need to consider which nutrients you’re buying, and perhaps make an investment in a thermometer/hygrometer combo. Some clippers and RQS trimming scissors wouldn’t hurt, either.

The Average Cost of an Indoor Grow Room/Tent

Below are the costs of building a small grow tent fit for almost any hobby grower using the equipment we’ve listed above. The only things we’ve left out are the cost of soil/nutrients and room refurbishments (if you choose to grow in a room rather than a tent), which can vary widely.

  • Grow light:HELESIN 1000w Full Spectrum LED Grow Light, complete with Veg and Bloom triggers, cooling fans, hangers, and safety goggles. Price: €110.
  • Tent:Secret Jardin Hydro Shoot Mylar Grow Tent with window, ducts, and flood tray. Price: €111.
  • Exhaust:Calimaero 100mm inline fan 33W (198m³/h airflow capacity): €55.
  • Fan:40cm Orbegozo wall mount fan. Price: €32.
  • Thermometer/hygrometer. Price: €13.
  • Pots: 5 19L RQS fabric pots. Price: €40 total (€8 per pot).
  • Seeds: 5 White Widow Automatic Seeds. Price: €35.
  • Easy Start seed starter pots. Price: €7.
  • Clippers and trimming scissors:Felco 2 and RQS trimming scissors. Price: €53.


Keep in mind that it is possible to build a grow room that’s far cheaper (especially if you opt to build a budget tent yourself) or far more expensive than the one we described above. These are just ballpark figures for a medium-sized tent fit for both beginner, intermediate, and advanced growers.

How to Calculate the Running Costs of Your Room

Besides the upfront costs of buying all the above equipment, you also need to consider the cost of running your grow room from seed to harvest. While it can be difficult to calculate these costs properly down to a tee, the formulas below can help you get a solid idea of the rough costs of operating your grow room.

To calculate the electricity requirements of your grow room, you’ll need to know the following:

  • The wattage of your equipment.
  • The running time for each piece of equipment per day.
  • The cost of electricity in your area.

The formulas we use below will be for a 1m² and 2m tall grow tent with a 1000W light, a 60W exhaust fan, and a small 30W wall fan. Although the exhaust fan linked above is only a 33W, a 60W is much more common, especially if you are looking for a more discreet growing operation. In fact, most of these systems will be also equipped with a carbon filter, to reduce even further the smell of your plants. The growth cycle we will base our calculations on will be 4 weeks of veg and 8 weeks of flower, and the electricity price we will use is €0.2 per kilowatt-hour (the average price across Europe according to the 2019 Strom report).

Calculating the Cost of Running Your Grow Lights

The cost of running your lights will obviously depend on the wattage of the grow light you’re using. Typically, growers will provide their plants with 50–80W of light per square foot of canopy (or 500–800W/m²), but some may push things further to increase their yields.

On average, indoor growers tend to let their plants veg for 4 weeks under an 18/6 light cycle before moving them to 12/12 cycle for 7–9 weeks for flowering. Keep in mind that flowering times can vary dramatically from one strain to another.

To calculate the cost running your grow lights, start by calculating the number of kilowatt-hours your lights need to run using the following formula:

Number of hours running x (watts/1000) = Kilowatt-hours (kWh)

Then, multiply that number by the price per kilowatt-hour of electricity in your area.

If we’re running a 1000W light 18 hours per day for 4 weeks (roughly 540 hours) of veg, then 12 hours per day for 8 weeks of flowering (roughly 720 hours), our formula would look like this:

1260 total running hours (veg + flower) x (1000 watts / 1000) = 1260kWh.

At €0.20 per kilowatt-hour, the total cost of running a 1000W grow light for 4 weeks of veg and 8 weeks of flower is €252 (1260 x 0.20).

Calculating the Cost of Running Your Fans

Fans are the best way to manage the temperature and humidity in small grow rooms. If you’re operating a larger room, you might need to invest in multiple fans, air conditioning, and humidifiers.

Both your inline and wall/floor fans will be running 24 hours per day from the beginning of your grow right through to harvest (12 weeks in the case of our example). To calculate these running costs, we’ll use the same formula we used to calculate the running costs of our lights.

For our 60W inline fan, the formula will look like this:

2160 hours running (24 hours for 90 days approx) x (60 / 1000) = 279.94 kWh

For our 30W wall fan, the formula will be:

The total cost of running both our inline and wall fan (at €0.20 per kWh for 24 hours during our entire 12-week grow) will cost €68.95 (344.74 x 0.2).

The Average Cost of Running a Grow Tent in Spain

The running costs for the tent we described above in Spain (with an average electricity price of €0.2403 per kWh) are:

  • 1000W LED grow lights: €302.40 (1260kWh x €0.2403)
  • 60W exhaust: €32 (129.6kWh x €0.2403)
  • 30W wall fan: €15 (64.8kWh x €0.2403)


The Average Cost of Running a Grow Tent in Germany

The running costs for the tent we described above in Germany, where electricity costs are €0.3088 (the highest in Europe) are

  • 1000W LED grow lights: €389.09 (1260kWh x €0.3088)
  • 60W exhaust: €40 (129.6kWh x €0.3088)
  • 30W wall fan: €20 (64.8kWh x €0.3088)


Note: These costs are calculated based on the average electricity rates in Spain according to the 2019 Strom Report and an average 4-week veg and 8-week flower period. The actual price of running a grow room in your area may vary greatly depending on the cost of electricity where you live and the length of your veg and bloom phases.

How to Cut Down Your Energy Consumption

As we saw above, it takes quite a bit of energy to grow cannabis indoors. Luckily, you can reduce the environmental impact of your grow room and its running costs by minimizing your energy consumption wherever possible.

These are just some of the ways you can save energy when growing weed:

  • Go Solar: While installing solar panels can be expensive, it’s a great investment for serious growers who are producing multiple harvests a year and are serious about cutting down their energy consumption.
  • Use a Combination of Artificial and Natural Light: Your grow lights are the biggest energy consumers in your room. If you get strong, direct sunlight where you’re living (either from a big window, outdoor garden/patio, balcony, or terrace), consider growing your plants under the sun and using your grow lights as a secondary source of lighting.
  • Use Passive Air Intake: If you’re running a small grow tent, you may not need to run an inline fan to replenish the air around your plants. Simply leaving one of your ducts or ports open, along with using a small wall or floor fan, should keep the air circulating around your tent.

How to Cut the Costs of Growing Weed at Home

There are several ways to cut down the costs of your weed growing operation. These include:

  • Reducing Your Energy Consumption: Using the methods we mentioned above to reduce the energy requirements of your grow room is one of the best ways to drive down the costs of your grow.
  • Using Natural Airflow and Light Wherever Possible: You don’t want to only rely on the machines, after all! Take advantage of whatever natural airflow and light you can access.
  • Recycling Your Soil: Quality soil can sell for a lot of money, so rather than forking out for fresh soil each time you start a new grow, try recycling your old cannabis soil!
  • Reducing Your Water Use: Cannabis is a thirsty crop. Rather than watering it using tap water, consider collecting rainwater and condensation runoff from air conditioning to reduce your water usage. Enriching your soil with perlite and vermiculite can also improve its water retention, meaning you’ll have to water your plants less frequently. Finally, you can also recycle the water from your runoff or reservoir (in hydroponics) to reduce your grow room’s/tent’s water bill.
  • Making Your Own Organic Soil, Pesticides/Herbicides, and Nutrients: Using a combination of compost teas, worm castings, and natural pesticides (like salt or eucalyptus spray) is a sustainable way to grow cannabis that not only helps minimize your grow’s environmental impact but also helps take care of your pocket.


Building and running an indoor grow room obviously comes at a cost. Keep in mind, however, that growing your own weed indoors is an investment that, in time, will pay off every time you harvest your own bud. Rather than having to buy bits at a time from a dispensary, coffeeshop, or elsewhere, you’ll have vast quantities of flower right at your fingertips.

Worried about the cost of growing weed indoors? Click here for an in-depth look at the cost of building and running an indoor cannabis grow room or tent.