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Discover The 5 Best Glass Greenhouse Kits for Thriving Plants

Discover The 5 Best Glass Greenhouses for Thriving Plants

A glass greenhouse allows you to grow plants in a protective and nurturing environment while adding luxury to your backyard. Glass offers many benefits over other materials like polycarbonate and is generally much appealing to the eye. This article explores the 5 best glass greenhouses on the market:

  • Janssens Royal Victorian VI Greenhouse - Best Overall
  • Exaco Janssens Junior Victorian Greenhouse - Most Durable
  • Cathedral Victorian Greenhouse - Most Spacious
  • Exaco Janssens Retro Royal Victorian VI 34 - Most Stylish

Janssens Royal Victorian Greenhouse VI 23 - Best Overall

an actual image of the Exaco Janssens Royal Victorian VI Greenhouse VI 23 surrounded by plants

The Janssens Royal Victorian Greenhouse VI 23 is made with 4mm tempered glass panes that are secured with heavy-duty rubber seals for insulation. It stands taller at 6'7" high for more headroom.

This greenhouse uses thicker aluminum profiles and 10mm triple layer "X-Strong" polycarbonate walls available for colder climates. It comes with a sliding door, roof windows, spindle and automatic window openers, gutters with downspouts, and a 6” foundation frame. The Janssens greenhouse also includes a misting system.

Key Features:

  • 4mm tempered glass panes
  • Available with 10mm triple layer "X-Strong" polycarbonate walls
  • Uses thick aluminum profiles for durability
  • Comes with a sliding door, roof windows, and automatic openers
  • Includes gutters, downspouts, and a 6” foundation frame
  • Misting system included


  • Better insulation from 4mm glass and rubber seals
  • Durable from the thick aluminum framework
  • Roof windows provide ventilation
  • A tall design provides more headroom
  • Easy to connect misting system


  • Assembly instructions could be clearer
  • May need to drill holes to insert bolt heads



Final Verdict:

The Janssens Royal Victorian VI Greenhouse is the best overall glass greenhouse for its superior insulation, durability, and design. The thicker glass panes and rubber seals provide better temperature regulation. And the strong aluminum framework and polycarbonate walls make this greenhouse sturdy. With useful features like a misting system, roof windows, and sliding door, this high-end greenhouse is worth the investment for seasonal plant protection and growing.

Exaco Janssens Junior Victorian Greenhouse 23 (79 sq.ft.) - Most Durable

an actual product image of the Exaco Janssens Junior Victorian Greenhouse standing in a garden

The Exaco Janssens Junior Victorian Greenhouse stands out for its exceptionally durable construction using high-quality materials like 4mm tempered glass and thick aluminum framing. This heavy-duty build allows the greenhouse to withstand all kinds of weather conditions and elements, from rain and snow to high winds and hail. The tempered glass in particular is designed to be shatter-resistant.

At the same time, the Victorian styling provides an attractive, vintage flair. With abundant headroom and spacious 5' side walls, the interior growing environment gives you ample room to start seedlings, overwinter plants or grow your collection.

Key Features:

  • Made with 4mm tempered glass and thick aluminum framing for durability
  • Single-pane glass panels provide better insulation than multi-pane
  • Large 5' side walls and 8'2" peak height for abundant headroom
  • 1-2 roof windows for ventilation
  • Large gutters with downspouts keep plants hydrated
  • T.U.V. and GS certified for safety


  • Durable tempered glass and aluminum construction
  • Spacious interior for starting seedlings or overwintering plants
  • Good insulation from single-pane glass and tight seals
  • Optional accessories like seed trays, shade cloths, and auto window openers


  • Must assemble in exact order or parts won't fit
  • Difficult for one person to assemble



Final Verdict:

For gardeners wanting the best greenhouse that can withstand years of use and any weather conditions, the Exaco Janssens Junior Victorian is the most durable option. Its rugged construction and resilient materials like tempered glass make this a long-lasting investment. Despite assembly challenges, its strength, beauty, and ample growing room provide great value for your money.

Cathedral Victorian Greenhouse with Large Cupola 15 x 20 Ft- Most Spacious

Spacious 15x20 ft greenhouse with an elegant large cupola, featuring expansive glass panels and a durable frame, set against a clear blue sky.

With its generous 15 x 20 ft dimensions, the Cathedral Victorian Greenhouse is the most spacious option available. The 298 square feet of floor space and tall 12' 2” sides provide ample room for all your gardening and plant-growing needs.

This greenhouse features robust pre-welded aluminum framing paired with 4mm tempered safety glass panels for exceptional durability and insulation.

Key Features:

  • 298 sq ft floor space
  • Expansive 15' W x 19'11" L dimensions
  • 4mm tempered safety glass
  • Pre-welded aluminum frame
  • Double doors, sliding door, 2 hanging windows
  • Louvered & 4 roof windows with auto openers
  • 10' x 5' extended roof cupola


  • Very spacious for maximum usage
  • Versatile for greenhouse, sunroom, or hot tub cover
  • Beautiful Victorian design adds value
  • Durable aluminum & glass construction
  • Numerous vents & windows for climate control


  • A large footprint requires substantial space
  • Not portable or easily moveable



Final Verdict:

For those needing maximum growing space, the Cathedral Victorian Greenhouse is the best spacious option available. While costly, its quality build and abundant features make it ideal for the serious gardener. Just be sure you have ample room to accommodate its large footprint.

Exaco Janssens Retro Royal Victorian VI 34 150 Sq. Ft- Most Stylish

a product image of the Exaco Janssens Retro Royal Victorian VI (Three Sizes)

The Exaco Janssens Retro Royal Victorian VI 34 greenhouse combines classic English styling with modern functionality. This 10'2" x 15' greenhouse features narrow 14" tempered glass panels for an authentic look along with decorative lower side panels.

Key Features:

  • Strong aluminum frame with 4mm tempered glass panes
  • Narrow 14” pane spacing for traditional English aesthetic
  • 150 sq. ft. of growing space
  • 6’7” high sidewalls
  • 4 roof windows (2 auto openers & 2 spindles)
  • 1 top-hang side window
  • 2 hinged doors with pumps
  • Large gutters with downspouts
  • Misting system


  • Timeless and elegant visual design
  • Narrow pane spacing maximizes sunlight
  • Plenty of ventilation and temperature control
  • Lots of included accessories


  • Requires professional installation
  • Decorative panels reduce growing space slightly



Final Verdict:

The Exaco Victorian Greenhouse VI 34 is the most stylish option for gardeners who value aesthetics as much as functionality. The classic English design is unmatched while still providing modern conveniences like automatic windows. The premium price tag ensures excellent construction and materials for this heirloom-quality greenhouse. Overall, it's the best choice for sophisticated gardeners who want a greenhouse that's as beautiful as the plants inside.

A 15x20 ft Victorian cathedral greenhouse surrounded by lush garden, with a distinctive large cupola and green framework.

Things to Look for When Buying the Best Glass Greenhouse

Here are the factors you must consider before buying a glass greenhouse so you choose the valuable greenhouse that will bring you years of gardening enjoyment and plant nurturing.

Durability and Longevity

When investing in a glass greenhouse, you'll want one built to last. Look for toughened safety glass at least 4mm thick, as it's more impact-resistant than standard glass. Tempered glass is an excellent greenhouse covering. Aluminum frames are very durable and resist corrosion better than wood or steel. Choose powder-coated aluminum for maximum longevity. Custom greenhouses can be designed for added resilience in wind, snow, and hail.

Insulation and Temperature Control

Glass offers superior insulation compared to polycarbonate or plastic panels. Double pane glass further enhances insulation but single pane also performs well. Look for rubber seals between the glass panes to prevent heat loss. Roof vents, automatic windows, and doors allow ventilation to regulate temperature. Misting systems and exhaust fans also help maintain ideal growing conditions inside.

Visual Appeal and Design 

A glass greenhouse adds beauty to your garden with more clarity and elegance than plastic versions. Consider an ornamental Victorian style for visual appeal. But also ensure the greenhouse height and layout give you ample headroom and space. Decorative touches like finials, curtains, shelving, and benches enhance the interior.

Ease of Use and Maintenance

Look for greenhouses with large doors, roof vents, and windows that open easily. Automatic openers and louvers increase convenience. Gutters, shelves, workbenches, and sinks simplify gardening tasks. While durable, glass needs occasional cleaning and sealing. Cedar frames require less maintenance than painted wood. Aluminum withstands weather well.

Cost and Value

Glass greenhouses range widely in price. Weigh costs against factors like longevity, quality of materials, and included accessories. Consider the value of year-round plant protection and the aesthetic enhancement glass offers. Though an investment, a well-built glass greenhouse will provide enjoyment for many years.


With the right glass greenhouse, you can create a beautiful and functional space to nurture your plants year-round. Glass offers superior insulation, sunlight transmission, and visibility compared to other covering materials.

While an investment, glass greenhouses provide lasting value and will enhance your gardening experience.  With proper care and maintenance, a high-quality glass greenhouse can provide a lifetime of enjoyable gardening and become a treasured part of your home.


What are the advantages of a glass greenhouse kit?

The advantages of a glass greenhouse kit include better light transmission, improved aesthetic appeal, and durability. The glass provides a clear, unhindered view which gives a natural look to your garden. Glass greenhouses offer a superior look and feel compared to their polycarbonate counterparts, and they are generally regarded as being more durable and longer-lasting.

How can I choose the right glass greenhouse?

When choosing the right glass greenhouse, consider factors like the size of your garden, your budget, and the type of plants you want to grow. You should also think about the greenhouse material, whether to choose polycarbonate or glass, and if choose glass, what type of glass greenhouse is the best. Greenhouse manufacturers offer single-pane tempered glass, double-pane glass, and annealed glass options among others.

What type of glass is used in the Pacific Glass Greenhouse?

Pacific Glass Greenhouses are made with tempered glass that is toughened to withstand heavy wind and hail. The glass panes in this type of greenhouse offer a higher level of safety. The glass is quite inert and does not react with any gases or materials inside the greenhouse, maintaining a healthy environment for your plants

What should I choose between glass or polycarbonate greenhouses?

Glass greenhouses offer better light transmission and are more visually pleasing than polycarbonate greenhouses. However, polycarbonate greenhouses are lighter, easier to install, and more resistant to breakage. The decision between glass and polycarbonate depends primarily on your budget, personal preference, and the specific needs of your plants.

Why are glass greenhouses more costly than other types?

Glass is a more costly material compared to polycarbonate or plastics. Moreover, the construction of a glass greenhouse is more complex, requiring a stronger frame to hold the glass panels and more care during the assembly process.

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