Category: Facility Design

Cannabis Grow Facility Design | Critical Considerations


cannabis facility layout

Basic Layout with Two Flowering Rooms

Cannabis cultivation facility design is a part of the business planning process that is worthy of very deep consideration. Some cultivation businesses have failed because of poorly considered layouts and mechanical systems that are difficult to change once the site is set operational.

For example, undersizing the environmental controls is an error that’s almost impossible to overcome. HVAC systems need to have redundancy, backup power, be cleanable outside plant rooms, and be easy to repair. They must be sized properly to remove the massive amounts of moisture created by plant growth. Air circulation must be sufficient to keep all plants swaying in an artificial breeze, and also to keep the upper level flower canopy (in a vertical grow) from getting too hot. The environmental controls, when done correctly, can cost between $200-$250 per square foot as a capital expense, including engineering and installation. The reason it’s worth the money is because failures and inconsistencies in environmental controls are the #2 cause of crop loss. (The #1 cause is acquiring pests from clones brought from other facilities.)

You might have noticed from your research that many indoor cannabis cultivation spaces use 8 or more individual flower rooms that typically measure about 30 ft across and 50-100 ft long. This approach has some good logic behind it. When the rooms are divided and self contained, they can have their own temperature controls, pest treatment practices, and they subdivide the workflow into digestible chunks, so one room can be set up, treated or harvested at a time. Further, with multiple flower rooms, a pest or mold outbreak can be contained to a small percentage of the overall crop.

Being an R&D oriented cultivation consultant and educator, I also like divided rooms because they create a good foundation for controlled experiments. If, for example, you wanted to test the efficacy of a certain amount of Co2 injection, or a type of lighting system or nutrient regimen, doing this in one of your rooms, with another room containing the same cultivars with no other variables, gives you reliable data on which to base protocol changes across the site.

Let’s dig into the grow facility planning process, and all of the major considerations you’ll need to maneuver. 

I find that most people who contact my website need a basic primer on the facility design process. They know they want to go into the business, but they need a lot more information in order to proceed successfully.

Of course building a cannabis grow facility is not advised for some people. It’s expensive and complicated and, in many legal cannabis regions, it’s also highly competitive. Indoor plant cultivation requires maintaining tight temperature and humidity ranges, and fresh breezy air movement at all times. Without clean and controlled conditions all the time (literally 100% of the time), plants quickly develop mold, insect and/or nutrient problems that take all of the joy out of being grower and possibly also all of the profit out of being the cultivation facility business owner.

Because so many investors and entrepreneurs are jumping into the cannabis cultivation business lately, an oversupply problem is developing in many places, which is gutting the value of a wholesale pound of finished cannabis flower. For wholesale producers approaching potential buyers, this means that only the highest quality flowers will sell. Anything “B grade” or below ends up going to extraction, fetching about the same price as the cost of production, hence the cultivation project breaks even or loses money.


The Importance of a Having a Great Lead Grower

Cannabis Facility Lead Grower

If you haven’t grown cannabis before, or if you haven’t personally become intimate with the quality differences in various samples of finished cannabis, it’s unlikely that your first cultivation facility will produce easy sellable product in a competitive marketplace. You can possibly overcome the odds by hiring a great grower, but it’s very hard to find one. Almost all of the project managers I’ve encountered believe that they’ve hired a good grower, and a year later, they are looking for a new one. Most of the best commercial cannabis growers either work for themselves or have already been swallowed up by well financed projects.

It takes a uniquely talented person to run a professional cultivation facility. This person needs to be a systems thinker, have management/people skills, be sensitive to micro changes in plant appearance from day to day, and have experience with early recognition of a myriad of common problems cannabis can acquire. S/he needs both a broad sense of project goals and a detail-oriented awareness of plant development and tracking. Start thinking now about how you might find this person. Some of the cannabis staffing companies have resumes from growers with commercial experience from Oregon, Washington, California and Colorado where cultivation has been happening legally for several years already. Your cultivation consultant can help you interview and choose people from these staffing pools.

Construction Planning Process and Build-out

As a project developer, first be aware that ground-up construction will significantly delay the start of cultivation project over leasing a pre-zoned cultivation warehouse or building space. The clients I’ve had who have pursued ground-up construction get bogged down full time for an average of 2-3 years working their way through the permitting and compliance processes. They have often spent over $3 million before breaking ground. If the investors have deep pockets and a lot of patience, then no problem, but usually this delay is a source of major frustration for those involved.

For ground-up facilities, there are many more permits and approvals to obtain, and sometimes deal killers occur, like the discovery of an endangered species nearby or archaeological evidence found on site. Also, neighbors will often stall a cannabis project by objecting at public hearings. Unfortunately, hardly any project proceeds without some kind of unexpected costly hindrance coming out of left field.

Getting into the Details of Cannabis Facility Design

For the sake of getting into some more practical planning information, let’s assume you are either purchasing or leasing a warehouse in a properly zoned cannabis cultivation area. This is the most common scenario and the path of least resistance for any soon-to-be cultivation facility operator. Now what?

cannabis project management

There’s actually a fairly typical pathway that must be pursued. Let me break it down for you:

Several agencies and contractors will need to be hired to bring your whole project together. If you are well financed, you’ll hire out project management to a business management company, but more commonly, you will be acting as your own project manager. This means you will serve as the hub for the agencies and contractors to come together. It’s up to you to either know all of the rules unique to a cannabis business development project in your jurisdiction, or to be able to quickly access them, so that you can make the right decisions with your project team as things progress. I’ve seen license applicants use attorneys for quick answers to regulatory questions, or they also sometimes use lobbyists or cannabis compliance specialists.

The contractors you will need to hire for construction planning are:

A Cannabis Cultivation Consultant

This is someone who can teach you the different cultivation method options you have to choose from, tell you the costs of the various options, the ease of use, pros and cons, and help you devise a reliable system before you’ve built any walls in the building. Different cultivation methods use room space differently, so the rooms essentially get built around the furniture and the plant canopies. Like any good business person, you need to have a detailed and fairly well guaranteed system planned out in order to hit the ground running. Your cultivation consultant also teaches you how to implement efficient day-to-day operations that minimize labor and supply costs and streamline workflow. Look for a consultant who does not sell products of their own or accept commissions from any equipment companies, but rather, one who has tried many different kinds of cultivation systems and knows how to strike the best balance between low cost, simplicity and large, high quality yields. (Full disclosure: this is a service I provide for controlled-environment marijuana cultivation sites under 50,000 square feet in size.)

cannabis facility architect

A Cannabis Facility Architect

The architect creates submittable drawings for the Planning Department based on a layout and information provided by the cultivation consultant. The architect must be licensed in your state and preferably have some cannabis facility design or other similar design experience.

A Mechanical Engineer

The engineer should have experience designing indoor plant cultivation facilities and will design the system for your environmental controls, electrical and plumbing requirements based on information provided by the cultivation consultant. The engineer will also design back-up power systems and HVAC redundancy so that mechanical failures won’t mean immediate doom for your precious plants. Some architecture firms have engineers on staff, but the bulk of the projects I’ve worked on have hired separate engineering firms. The engineer does not have to be locally licensed, but if s/he is not, you’ll need a locally licensed engineer to stamp the drawings for submittal to the Planning Department before you can begin construction. (Note that the first engineering-related issue you must address is ensuring adequate electrical service to the facility. Service upgrades are usually required and can cost anywhere from $10,000 – $1,000,000 and can take from weeks to months to be completed.)

A General Contractor

This person will need to be licensed in your state and should have applicable construction experience. S/he will take the drawings approved by the Planning Department and start construction. Both the architect and the general contractor should be familiar with the construction codes so that no choices will be made along the way that could jeopardize your project as it moves towards final approval.

Other contractors that some projects need:

A Structural Engineer

Sometimes this service is needed to determine the weight capacity of the building in case HVAC equipment or solar panels need to be mounted on the roof.

An Environmental Engineer

Sometimes this service is needed to calculate needs and create systems for handling waste water, odors, and any other potential environmental hazards that cannabis cultivation facilities can cause.

Major Cultivation Equipment Suppliers

The first few equipment suppliers you’ll need to contact (with recommendations from your cultivation consultant and engineer):

Grow Lighting Company

This company will create a lighting layout based on the light intensity recommended by your cultivation consultant. The layout will help the engineer and architect get a clearer picture of the project they are designing. Your cultivation consultant should be aware of the pros and cons of the various lighting companies and their products and will audit and possibly revise layouts provided by these companies. Expect to spend about $65 per square foot of plant canopy for the cost of LED lights.

Racking/Benching Company

This company will provide the “furniture” that your plants sit on. You might choose two-tier mobile racks or single-tier stationary or rolling benches, depending on your budget and ceiling height. With dimensional variations from one racking provider to another, you need to choose your cultivation racks before the cultivation consultant draws out your rooms. Your cultivation consultant should be educated in detail about the differences and pros and cons of the racking and benching options. Benching has a wide range of pricing depending on the quality of construction and features, but will run between $25-$50 per square foot of canopy.

HVAC/Dehumidification Company

This company will take information from your cultivation consultant and engineer about electrical use and moisture quantity generated at the site, Co2 requirements and air circulation/purification, along with your ideal environmental settings for various stages of growth, and give you a quote on the equipment required to control the indoor conditions of the site. Check out our introduction to Cannabis Climate Controls for a primer on this subject.

Note that both your cultivation consultant and your mechanical engineer will have valuable input on how to size and choose a cannabis climate controls system.

Irrigation/Fertigation System Controls Company

This company will handle water management for your plants. They’ll design and install a system that controls nutrient injection into the water, serves the plants based on signals from timers or sensors, collects the drainage, filters it and returns it to the plants. Some cultivation sites still discard their runoff, but a medium or large cultivation facility, in order to meet environmental regulations, will likely be required to either recirculate the water or use a boiler to evaporate the waste down to a powder or sludge. Either option will cost the project around $150,000 on average. This is one of the big expenses that doesn’t change much based on the size of the facility, where lighting, racking and HVAC are all priced according to the canopy size.

* Note that there are several other smaller companies that will get used for supplies and less critical functions, like those providing nutrients, grow media, containers, measuring equipment, etc, but we are focusing on the big-ticket items right now.

On top of all of these above costs- permitting, attorney/s, designer/s, admin, consultants, and structural equipment- the one other hugely significant cost is construction labor and materials, which could come in at a cost at of about $150 per square foot.

A word to the wise: Do not make your equipment choices based on sales pitches from the companies providing the equipment. All sales pitches sound good and do not warn you about the problems you will encounter with their products. It might seem self interested when I say this, but one of the main reasons you need an experienced cannabis cultivation consultant is to help you navigate through the sales pitches and equipment and supply choices, so you won’t unwittingly choose a flawed system. Experienced commercial cultivators have already tried most of the methods and well known equipment on the market and can keep you from reinventing the wheel.


All of the above boils down to a project cost around $350-450 per square ft. (depending on cost of labor in your area and LED vs/ HPS lighting and racking systems). Yes, it’s very expensive, but I have found that It’s better to make the project smaller and do it right than to skimp on any of the critical functions or legal requirements.

Jennifer Martin, M.A. is a veteran commercial indoor grower from Northern California who consults for licensed cultivation facilities in the US and Canada. She is the winner of the 1998 Bay Area Cannabis Cup, a regular industry trade show speaker, and professes expertise in the areas of LED cannabis facility design, rockwool cloning/propagation, custom nutrients, genetics evaluation and acquisition, and facility operations.

Do you need a Cannabis Security Plan? It will come in handy as you are obtaining your license and designing your facility.