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6 Best Heavy-Duty Greenhouse Kits On The Market

Buying a greenhouse is a large investment and you want a greenhouse that is durable enough to withstand time and harsh weather conditions. Finding a quality heavy-duty greenhouse is not easy. 

With all greenhouses claiming to be heavy-duty, how do you know which kit is really made to last? Don’t worry we’ve got your covered. 

In this article, we will go over the best heavy-duty greenhouses on the market as well as what features determine whether a greenhouse is heavy-duty or not.

Let’s get started and help you find the best heavy-duty greenhouse to fit your needs.

 

What is a heavy-duty greenhouse? 

A heavy-duty greenhouse is a greenhouse that is built from durable materials and that is able to withstand the elements including heavy rain, snow, and strong winds. There are several key features of a greenhouse that will determine if it’s heavy-duty and to what degree it’s heavy-duty. 

There are a few metrics that can help you determine if a greenhouse is heavy-duty. Those metrics are: 

  • Snow Load
  • Wind Resistance
  • Frame material

Wind resistance is the level of winds that the greenhouse can withstand before it's damaged. The snow load is the amount of snow that the frame can hold to maintain it's structural integrity. 

 

Heavy-Duty Greenhouse Features

The key features that determine if a greenhouse is heavy-duty are: 

  • Frame Material
  • Frame Reinforcement
  • Panel Material 
  • Panel Thickness 

Frame Material

The frame material is one of the most important features of a heavy-duty greenhouse. The two most common materials used in heavy-duty greenhouses are aluminum and steel. Both of these materials are ideal because they provide sufficient strength to support your greenhouse.

Aluminum is highly desirable because it’s durable and also lightweight. In addition, there are many different types of aluminum and the type can dictate how durable the frame is. There are other options for aluminum frames which include reinforced aluminum and powder-coated aluminum that can make it more durable.

Stainless steel is stronger than steel which makes it a better choice for a greenhouse frame. With that said, aluminum has a better strength-to-weight ratio than stainless steel. This simply means that although steel greenhouses are much stronger they are much heavier which is an important consideration when choosing a greenhouse.

Another viable option for a greenhouse frame is wood. Wood greenhouses are durable and heavy-duty when the right type of wood is used. In particular, because wood is very durable and is easy to reinforce with additional support.

Panel Material

The material of your greenhouse panels plays a very important role in whether your greenhouse is heavy duty or not.

There are two materials that are often considered the most durable wall and roof panels are tempered glass and polycarbonate. Both these materials are great insulators and are also able to withstand heavy load capacity.

Other common panel materials that are used include fiberglass, acrylic, polyethylene, and other poly-based plastics. These materials are not durable and I would not classify them as heavy-duty. Polycarbonate and glass panels typically have much higher wind resistance, load capacity, and durability than any other panel material.

With that said, one of the most important aspects of polycarbonate or glass greenhouse panels is their thickness. The thickness will have a huge impact on how heavy-duty the panels are.

Panel Thickness

Panel thickness has a huge impact on the heavy-duty nature of your greenhouse panels.

The fact is very simple - the thicker the panels the more heavy-duty they are. For example, simply opting for polycarbonate or glass does not guarantee your greenhouse is heavy-duty.

For example, 0.7mm polycarbonate panels are not considered heavy-duty. These panels are relatively thin and don’t have a high load capacity or wind resistance.

In general, there is a certain level of polycarbonate panel thickness and tempered glass thickness that offers some level of heavy-duty nature.

Below are some guides when choosing panel thickness:

Degree of Heavy Duty Polycarbonate Panels Glass Panels
Low 4mm Twin-Wall Polycarbonate 4mm double-pane tempered glass
Moderate 8mm twin-wall polycarbonate 6mm double-pane tempered glass
High 10mm Triple-wall polycarbonate  8mm triple-pane tempered glass

 

What frame is best for a heavy-duty greenhouse?

Aluminum frames are the most commonly used frame in greenhouses. This is because it is very strong and lightweight. In addition to being very durable, aluminum frames are rust-resistant, maintenance free, and have a very long lifespan. 

Another great material that you can use for a greenhouse frame is steel. Steel frames are less common on greenhouses although they are very durable. Steel is much stronger than aluminum but it’s much heavier and more expensive than aluminum.

 

Best Heavy-Duty Greenhouse Kits

1. Sigma Tunnel Greenhouse

Pros Cons
  • Affordable given the features it includes
  • Thick polycarbonate walls
  • Durable steel frame
  • High wind resistance and strong snow load
  • Comes in multiple lengths with a wide 10ft base.
  • Extendable up to 100 ft. in length by 6 ft. extensions

  • Heavy frame and panels 
  • Does not come in different widths - only 10 ft.
  • Expensive 
  • Only one option for panel walls. 
  • Does not have pre-made foundation option

 The Sigma Greenhouse is a great heavy duty greenhouse because unlike many greenhouses on the market it has a steel frame. In addition to the steel frame, it comes in a tunnel shape which improves the durability of the greenhouse. 

Tunnel shaped greenhouses are great because they disperse weight well and also prevent snow, rain, and debris from accumulating on the frame of the greenhouse. The tunnel shape allows everything to easily slide off improving its load capacity and wind resistance. 

The Sigma Greenhouse is a a great heavy-duty greenhouse for three key reasons: 

  1. 6mm Double-Wall Polycarbonate Panels
  2. Galvanized Steel Frame 
  3. Rust resistance and maintenance free frame

As a result, this greenhouse is built for all weather conditions with a 160 kg/m² and a wind resistance of 65 MPH. 

This greenhouse is not only heavy-duty but it also has many unique features that separate it from other greenhouses on the market. 

  • Two doors - one on either end wall 
  • Comes in various lengths starting at 13’, 20’, 26’, and 32’. 
  • Extendable by 6ft outside of standard sizes and up to 100ft
  • Large growing space with 7ft roof

 

Key Features

  • Extendable up to 100ft
  • Galvanized Pipe Frame
  • Heavy-Duty, Rust-Resistant Frame
  • Snow Load Weight of 160 kg / m²
  • Wind Resistance up to 65 MPH
  • 6mm Double-Wall Polycarbonate Panels 
  • Can Be Installed with or without a base
  • 5 Year Warranty

2. Sungrow Gothic-Arc Greenhouse

Pros Cons
  • Affordable given the features it includes 
  • Thick polycarbonate walls 
  • Durable steel frame 
  • High wind resistance and strong snow load 
  • Comes in multiple lengths with a wide 10ft base.
  • Extendable up to 100 ft. in length by 6 ft. extensions

  • Heavy frame and panels 
  • Does not come in different widths - only 10 ft.
  • Expensive 
  • Only one option for panel walls. 
  • Does not have pre-made foundation option

The Sungrow Greenhouse is a heavy-duty greenhouse that is affordable and comes in a variety of different sizes.

The Sungrow greenhouse is unique because it comes with a steel frame and thick 6mm polycarbonate panels. These two features make the greenhouse extremely durable and give it a high wind resistance and strong snow load. 

This greenhouse has a wind resistance of  65 MPH and a snow load up to 160 kg / m². This makes this greenhouse perfect for all four seasons including extreme weather conditions such as snow, heavy rain, and strong winds. 

Another feature that makes this greenhouse very heavy-duty is the gothic arc shape. The gothic arc shape improves the durability and heavy-duty nature of this greenhouse because it prevents debris from building up on the structure. 

The shape makes the greenhouse durable and maintenance free. This is because snow, rain, and debris will not accumulate on the structure due to the design.

The Sungrow Greenhouse is a a great heavy-duty greenhouse for three key reasons: 

  1. 6mm Double-Wall Polycarbonate Panels
  2. Galvanized Steel Frame 
  3. Rust resistance and maintenance free frame

This greenhouse is not only heavy-duty but it also has many unique features that separate it from other greenhouses on the market. 

  • Two doors - one on either end wall 
  • Comes in various lengths starting at 13’, 20’, 26’, and 32’. 
  • Extendable by 6ft outside of standard sizes and up to 100ft
  • Large growing space with 7ft roof

 

Key Features

  • Extendable up to 100ft
  • Galvanized Pipe Frame
  • Heavy-Duty, Rust-Resistant Frame
  • Snow Load Weight of 160 kg / m²
  • Wind Resistance up to 65 MPH
  • 6mm Double-Wall Polycarbonate Panels 
  • Can Be Installed with or without a base
  • 5 Year Warranty

3. Heavy-Duty Lean-To Greenhouse: SB Montecito Lean-To Greenhouse

Pros Cons
  • Comes in a variety of sizes
  • Made with 8mm twin-polycarbonate walls 
  • Reinforced aluminum frame 
  • 16 gauge steel reinforcements 
  • Comes with multiple roof vents
  • Includes barn style dutch door
  • Made in the USA

  • Kit is not pre-made, made to order which causes delays in shipping 
  • Limited and not traditional sizing options 
  • Only one option for panel size and material

The SB Lean-To Montecito Greenhouse is a great heavy-duty, lean-to greenhouse. There are a few things that make this a perfect heavy-duty lean-to greenhouse, the first is that it’s built with a weather-resistant, high-quality aluminum frame and 8mm twin-wall polycarbonate panels. 

A few other features that add to the heavy-duty aspects of this greenhouse include an all bolt construction and rafter ties for additional durability. In addition, the aluminum frame is bolted together using 16-gauge steel plates creating one of the strongest aluminum greenhouses on the market.

This lean-to models come in a variety of different sizes. It comes in different widths as the base from 6, and 9 feet. It also comes in a variety of different lengths including 8, 12, 16, 20, and 24 feet. 

 

Key Features

  • Frame made of weather-resistant, high-quality, mill finish aluminum frame.
  • 6ft high side walls for maximum growing space
  • 8mm twin-wall polycarbonate panels
  • All bolt construction for durability
  • Rafter ties for extra strength
  • Dutch door for easy use and improved ventilation
  • Mill finish or bronze powder coat.
  • Includes roof and side vents standard
  • Easy instruction manual included
  • Optional greenhouse growing kit with all essentials to get started
  • Made In the USA
  • Pre-cut, pre-drilled, and modular construction for easy assembly

4. Heavy-Duty Victorian Greenhouse: Royal Victorian Greenhouse

Pros  Cons
  • Option of glass or polycarbonate panels 
  • Great for extreme weather conditions 
  • High snow load and wind resistance
  • Moderate size with tall side-walls 
  • Optional full setup accessory kit
  • Includes two roof vents and 1 louver windows
  • Thick aluminum frame
  • Decorative roof ridge 
  • Built-in gutter system
  • Expensive
  • The greenhouse is heavy and can limit potential locations 
  • Accessory Kit is optional and an additional cost 
  • Can take some time to build and install

The Royal Victorian Greenhouse is a great heavy-duty victorian greenhouse. This greenhouse is very durable for two key reasons: 

  • Two heavy-duty panel options:4mm tempered glass or 10mm polycarbonate triple wall panels 
  • Reinforced aluminum frame 

It also comes in two different frame colors: green and black. In addition, it also includes a premium accessory kit that will help you get started with a seed tray and top-shelf. 

Like many other Janssen greenhouses, these greenhouses are extremely durable and are able to withstand harsh weather conditions. This is because it features thick walls in both glass and polycarbonate in addition to a thick aluminum frame. 

It comes standard with two roof vents and a louver window that will help regulate airflow and temperature when needed. 

This is the perfect greenhouse if you are looking for a moderate-sized greenhouse and you want some options when it comes to color, panel material, and accessories.

 

Key Features

  • Thick Aluminum Frame
  • Electrostatic frame finish
  • 4mm tempered glass or 10mm polycarbonate triple wall panels 
  • Sliding door that can be installed on either wall of the greenhouse. 
  • Includes 1 louver window 
  • 2 roof vents for effective circulation (1 automatic and 1 manual roof vent) 
  • Decorative roof ridge
  • Includes built-in gutter system
  • TUV & GS Tested and approved

5. Heavy-Duty Commercial Greenhouse Kit: Everest Commercial Tunnel Greenhouse

 

Pros Cons
  • Thick polycarbonate panels 
  • Strong steel frame 
  • Large commercial greenhouse 
  • Two large doors and two double door games for additional space 
  • Comes in a variety of sizes
 
  • Only comes in a width of 25 feet 
  • Does not come in smaller sizes than 25’ in length
  • Expensive 
  • Require professional installation or multiple people to install and build

If you are looking for a commercial greenhouse kit that is heavy-duty and can last all four seasons, the Everest commercial Tunnel greenhouse is your best choice. Buying a commercial greenhouse requires a steep investment and you want to make sure that your greenhouse is going to last the test of time. 

The Everest greenhouse is built with high-quality and durable materials. First, the greenhouse is made with 10mm double-wall polycarbonate panels that provide great support and protection against the elements. 

In addition to heavy-duty polycarbonate walls it also features a galvanized steel frame, steel bolts and reinforcements for added durability. 

This greenhouse has a maximum snow load of 480 kg/m² (98 psf) and a wind resistance up to 24 m/s. This makes it highly durable with some of the highest snow load and wind resistance on the market. 

In addition to being highly durable this greenhouse comes in a variety of different sizes with a base width of 25 feet. It also comes in a variety of different lengths from 25, 48, and 98 feet with the option to also extend.

 

Key Features

  • 10mm Double-wall polycarbonate panels
  • Comes with 2 doors and 2 double-door games (one on each end wall)
  • Comes in multiple sizes
  • Galvanized steel structure
  • Maximum snow load of 480 kg/m² (98 psf)
  • Wind Resistance up to 24 m/s
  • Tunnel design makes for easy maintenance
  • Rust-resistant frame
  • Extendable length
  • 10-year warranty

6. Best Heavy-Duty Wood Greenhouse: SB Red Wood Greenhouse

Pros Cons
  • Comes in multiple sizes 
  • Heavy-duty California redwood 
  • Multiple panel options 
  • Includes multiple windows and vents
  • Affordable given the quality of greenhouse you get
  • Hand made in the USA 

  • Hand crafted takes time to arrive 
  • Sizing options are limited
  • Wood can succumb to weather conditions

Finding a freestanding greenhouse is not easy. There are not many wood greenhouses on the market but Santa Barbara Greenhouse makes some of the best wood greenhouses on the market. 

SB greenhouses use durable and heavy-duty california redwood with a reinforced frame that is built to withstand all four seasons. In addition to the highly durable frame, you have two greenhouse panel options. 

SB Redwood greenhouses come with two panel options: 4mm tempered glass and 6mm twin wall polycarbonate panels. Both of these panel options are highly durable and provide exceptional insulation capabilities. 

This greenhouse comes in a variety of different sizes with multiple width options of 7, 9, and 14 feet. It also comes in a variety of different lengths including 8, 12, 16, 20, and 24 feet. This is great because you can find a greenhouse that fits your needs which includes a variety of options from small to large.

 

Key Features

  • Frame made of weather-resistant, high-quality California Redwood
  • Vertical 6ft high side walls for maximum growing space
  • Option of 4mm tempered glass or 6mm twin-wall polycarbonate panels
  • All bolt construction for durability
  • Extra framing for improved durability
  • Includes roof and side vents standard
  • Easy instruction manual included
  • Optional greenhouse growing kit with all essentials to get started
  • Hand Crafted
  • Made In the USA
  • Pre-cut, pre-drilled, and modular construction for easy assembly

 

Conclusion

There you have it, here are the best heavy-duty greenhouse kits on the market. Don't spend anymore time looking for a heavy-duty greenhouse because we have presented several different options for you to choose from. Whether you are looking for a specific price range, shape, or material this list has everything you need.