Container Greenhouse Canada: Cost & Build 2026

By Paul LeBlanc, owner, and Christian LeBlanc, second-generation operator, Van Blanc Ent. Inc.

Reading Time: 14 minutes

What grow types fit a container greenhouse?

A container greenhouse is a shipping container, usually a 40-foot high cube, converted into a climate-controlled growing room. The same steel shell serves three different builds: a leafy-green hydroponic farm, a mushroom-fruiting chamber, or a Health Canada licensed cannabis micro-cultivation room. The shell stays constant. The insulation, lighting, HVAC, and power inside it change completely with the crop.

The phrase “container greenhouse” hides three different conversations. A 40-foot box becomes a leafy-green hydroponic farm, a mushroom-fruiting chamber, or a Health Canada licensed micro-cultivation room for cannabis. The shell is the same. Almost everything inside it is different.

Leafy greens are the gentlest build. Lettuce, basil, kale, microgreens, and herbs want 18 to 22°C, modest humidity, and around 200 to 300 µmol per square metre per second of light. Power draw stays manageable. The same 40-foot container can produce the equivalent of roughly two to four acres of field lettuce per year when stacked vertically with NFT channels, which is why Freight Farms and the Canadian providers built their pricing brackets around this crop class.

Mushroom-fruiting chambers flip the script. Oyster and lion’s mane mushrooms want 18 to 22°C also, but humidity targets sit between 85 and 95 percent, fresh-air exchange runs aggressive, and light needs are minimal. The HVAC bill goes up because you are constantly fighting condensation while keeping CO2 low. Insulation matters more here than in leafy greens.

Cannabis micro-cultivation is the most demanding by an order of magnitude. Fitting out the steel for cannabis means matching the federal regulation set under Cannabis Regulations SOR/2018-144, building physical security to the Designated Person Security Clearance standard, the kind of heavy interior buildout we walk growers through, and running flowering lighting at 600 to 1,000 µmol per square metre per second. Power draw on a 200 m² flower room can hit 30 to 60 kW. HVAC load matches the lighting wattage one-for-one. That is why the cost ladder ends where it does.

How much insulation does a container grow room need?

A bare Corten steel shell is a thermal disaster for any grow room. Steel conducts heat outward in winter and inward in summer. Without insulation, your HVAC system runs continuously and your power bill turns into the story of the build.

Closed-cell spray polyurethane foam is the industry default. Two inches gets you around R-13. Three inches lands near R-21. Four inches reaches R-28 to R-30 depending on the product. For an Ontario grow build, four inches on walls and ceiling is the working minimum. What you pay to insulate a 40-foot high cube tracks foam thickness, density, and how much of the floor gets treated, and installed labour swings with the steel-price and contractor market in any given season.

Mushroom chambers and cannabis rooms push the spec higher. Closed-cell foam doubles as a vapour barrier, which matters when interior humidity sits at 65 percent for cannabis flower or 90 percent for oyster mushrooms. An open-cell foam or fibreglass batt build would soak moisture, lose R-value, and rot the steel from the inside in under a decade. Closed-cell is non-negotiable for high-humidity grows.

Floor insulation is its own line. Most builds add a closed-cell foam pour or a rigid foam board layer between the original marine plywood floor and a new sealed vinyl or epoxy surface. Plan for a separate floor-treatment line that scales with the grow type and the finish you specify. For cannabis, expect to add an epoxy seal coat that meets Good Production Practices for cleanability.

What PPFD and LED wattage does each crop need?

The lighting decision sets the rest of the build. Wattage drives power draw. Power draw drives HVAC sizing. HVAC sizing drives the electrical service. Every other system follows from this one.

PPFD, photosynthetic photon flux density, measures the light a plant actually receives. It is the working unit in commercial horticulture, replacing the older lumens-per-square-foot framing that came from human-vision lighting design. Plants do not see in lumens. They count photons in the 400 to 700 nm range.

For leafy-green builds, the fixture budget covers LED panels from reputable Canadian distributors. For cannabis flower at 30 kW, the fixtures alone command a far higher outlay because you are buying high-PPF horticultural-grade lights that are DLC-listed and rated for the duty cycle. Cheap fixtures cost more in lost yield and reflashed drivers within two seasons. Paul has watched buyers chase the bargain bin twice before they accept this.

Why is HVAC the biggest cost in a container grow build?

Every watt of light becomes a watt of heat. A 30 kW flowering room is also a 30 kW heater. The HVAC system has to remove every joule, hold the temperature setpoint within 1°C, manage humidity inside a 5-percent band, and exchange enough air to keep the plants healthy. This is where container grow builds bleed cash.

For leafy greens at 6 kW of light load in a 40-foot box, a 2 to 3 ton mini-split with a dedicated dehumidifier covers it. Budget for the equipment installed, including the ESA-certified electrical hookups. The system runs hard but it works.

For mushroom chambers, the HVAC is smaller but the dehumidification is reversed: you are humidifying, not drying. A commercial humidifier plus a small split system plus fresh-air exchange fans. Mushrooms forgive minor temperature swings but punish CO2 build-up with malformed fruit bodies, so air exchange matters more than tight thermal control.

For cannabis flower at 30 kW of light load, you are looking at a 7 to 10 ton system with twin commercial dehumidifiers rated to pull 200 to 400 pints of water per day combined. The line totals equipment plus install plus ESA inspection plus a glycol-loop manifold. This single item accounts for roughly half the gap between a leafy-green build and a cannabis build.

Which hydroponic method fits your crop: NFT, DWC, or ebb and flow?

Three hydroponic methods dominate container builds. Each suits different crops and different operational personalities.

Nutrient Film Technique (NFT). A thin film of nutrient solution flows continuously down a slightly tilted channel, past bare root systems. Plants sit in net cups along the channel. Energy efficient, water efficient, and the visual format most people associate with vertical farming. Best for lettuce, herbs, microgreens. The cost of a fully kitted 40-foot build scales with channel count and how much reservoir automation you add.

Deep Water Culture (DWC). Plant roots hang in an aerated nutrient reservoir. Air stones bubble oxygen continuously. Higher water buffer means more crop forgiveness when the pump fails for an afternoon. Best for larger plants: tomatoes, strawberries, peppers. Equipment cost in a container build runs slightly above an equivalent NFT setup because of the air pumps, larger reservoirs, and aeration hardware.

Ebb and Flow (Flood and Drain). Plants sit in inert media (clay pebbles, rockwool) inside trays. Trays flood with nutrient solution on a timer, then drain back to the reservoir. Mid-range water efficiency, very high crop versatility. Best for cannabis (vegetative or flowering), peppers, strawberries. Per 40-foot build, the cost lands in the same band as DWC, shaped by tray count, media choice, and pump automation.

The reservoir, dosing pump, EC and pH probes, and automation controller add a further line across all three methods. Your build is not finished until you have a controller that pages you at 2 a.m. when the pH probe drifts, because at some point the pH probe will drift at 2 a.m. and the controller is what saves the crop.

Does CO2 enrichment raise container greenhouse yield?

Outdoor ambient CO2 sits around 420 ppm in 2026. Greenhouse research has shown that elevating CO2 to 800 to 1,200 ppm during the photoperiod can increase leafy-green yields by 20 to 40 percent and cannabis yields by 15 to 25 percent, assuming light, water, and nutrients are not limiting factors.

Two delivery methods. A compressed CO2 tank system rents from industrial-gas suppliers on a monthly basis that includes tank exchange. A propane or natural gas CO2 generator combusts fuel inside the room, producing CO2 plus a small amount of heat and water vapour. The combustion route costs less monthly but adds complexity to HVAC sizing and ventilation. Most cannabis micro-cultivation builds we have seen choose the tank route because Health Canada inspectors prefer cleaner air-system documentation.

Budget for the equipment behind tank-fed CO2 enrichment, including the regulator, monitoring sensor, and solenoid valve tied to the controller. Mushroom growers do the opposite: they are venting CO2 produced by the substrate, not adding it.

How much electrical service does a container greenhouse need?

For leafy greens and microgreens, 100-amp 240V service usually covers the build. A container electrical 100-amp panel install in Ontario with a Hydro One service upgrade, ESA inspection, and the in-container panel and distribution. For most lettuce-tier builds that is enough.

For cannabis flower at 30 kW, microgreens at scale across multiple containers, or a strawberry build with serious supplemental light, you need 200-amp three-phase. The service-upgrade line depends on your existing infrastructure and covers the in-container panel, transformer if required, distribution, and ESA. If your property is more than 200 metres from the closest Hydro One pole, the line extension adds a further charge that climbs with distance.

This is the part of the build where amateur estimates fall apart. The electrician’s quote is real. The Hydro One quote, in 2026, is whatever Hydro One says it is. Buyers who skip the utility check before ordering the container regret it within two months.

What actually drives the cost of a container greenhouse?

This is where the build decisions from the top of the article get specific. There is no single number, because the variance inside each tier is real and depends on your site, your crop choice, your local labour rates, and which fixture and HVAC brands you specify. The table below shows how the biggest line items scale across the four common build types, expressed as relative intensity rather than a quote, so it holds regardless of where steel and contractor prices sit in a given season.

The Freight Farms Greenery S, the premium American turnkey leafy-green container, sits at the top of the market in 2026, and lands higher again once you convert to Canadian dollars and add HST. A Canadian-built equivalent from a custom integrator targets the same crop class at a comparable premium. A self-managed build, where you contract out insulation, electrical, HVAC, and lighting independently while buying the bare 40-foot shell from our Brantford yard, comes in well below either turnkey route. The trade-off is project management time. The premium turnkey buys you fewer phone calls.

Which container shell is right for a grow build?

For grow builds, three shell decisions matter more than any other:

Grade. One-trip is the default, which is why most grow buyers start from our freshly arrived stock that has only sailed once. The walls are clean, the doors seal, the floor is intact, and the interior paint is factory grade. You are about to spend tens of thousands of dollars on equipment inside this box. Save on a cargo-worthy unit and you will spend the savings sandblasting interior rust before you can install closed-cell foam. The other three grades exist for legitimate reasons, and if you are weighing a cheaper box we lay out how to read condition on a secondhand unit before you commit; for grow builds, one-trip is the working spec.

Height. 40-foot high cube. The 2.90 m interior versus 2.59 m on a standard container is the difference between two and three growing tiers, and it helps to compare the interior dimensions across box lengths before you commit a footprint. For NFT or DWC vertical builds, this is decisive. The high-cube premium over a standard 40 is modest at our Brantford yard, and the extra growing tier it unlocks more than pays it back.

Reefer or dry van. A reefer (refrigerated) container is pre-insulated, pre-sealed, and has an existing condensate drain. For mushroom and leafy-green builds, starting with a 40-foot HC reefer can shave the insulation line if the existing PUR foam is in good shape and rated for the temperatures you need. A used reefer with a non-working refrigeration unit is the value play here, since you are removing the refrigeration anyway and using the insulated shell. We carry both options at the yard.

Most cannabis micro-cultivation buyers go with a one-trip 40-foot HC dry van and add four-inch closed-cell foam, because Health Canada’s Good Production Practices documentation is cleaner when you started from a known-clean shell rather than retrofitting a reefer that previously hauled food.

Frequently Asked Questions

Reach Van Blanc in Brantford

We have been supplying shipping containers across Ontario since 1995. Our warehouse is at 90 Morton Avenue E in Brantford, and we deliver right across the province on a cash-on-delivery basis. Every quote comes with a real lead time, not a hopeful one.

Van Blanc Ent. Inc. 90 Morton Ave E Unit 1B, Brantford, ON N3R 7J7. Call 519-754-6844 or toll free 1-888-509-6658.

If you are planning a container greenhouse build, come see the yard before you order. Walking a one-trip 40-foot high cube in person is a different decision than scrolling photos online, and we would rather have you make that decision with your hand on the steel.

Related Reading

• Picking the right R-value for an Ontario build
• When a grow room needs powered air exchange
• Yard conversions we finish before delivery
• Spotting the too-cheap online listing