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Janssens Cathedral Victorian Greenhouse (20X15)
[MPN: Cathedral]

List Price: $40999.00
Our Price: $35999.00
Available Options:
Automatic Louver Window Opener:
Automatic Roof Vent Opener:
Extra Door:
Extra Waterproofing:
Louver Window:
Louver Window Lexan Cover:
Roof Vents:
Victorian 2-Slat Shelving:
Victorian 5-Slat Shelving:
Wheelbarrow Access Plate:
Quantity Availability: In Stock

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If you find this item at a lower price elsewhere including shipping and any taxes, please email us or give us a call and we will do everything we can to beat any valid online competitor's price! Be sure to include the link to the other site.

*We can not price match local stores, warehouses, price clubs, or prior sales and the item must be new and in stock. Please see our guarantee for more details.

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Due to extraordinary circumstances, this Janssens Greenhouse is not usually in stock for quick shipping, though it can always be available via a special order that can take up to 5-6 months or so to arrive.

As a long-time authorized dealer, we're accepting orders and are in constant contact with the distributor to ensure that your receive your greenhouse in a timely manner. We can also take your order at this time with only a 10% deposit.

Please contact us if you have any questions at support@greenhousenation.com or 888-881-3716.

15 year limited warranty The spacious Cathedral Victorian Greenhouse from Janssens, one of the premier builder of luxury greenhouses in Europe, is a beautiful addition to any garden. Its enormous 20X15 interior gives you space for anything you decide to grow, and many customers use it as an outdoor sunroom or even for a hot tub or covered pool.

Janssens aluminum greenhousesThe Cathedral Greenhouse includes four roof vents with automatic openers and a louver window to help keep the interior at a comfortable temperature. Two hanging windows on the sides can also swing up for added ventilation. A set of lockable swinging doors and a single lockable sliding door make entry simple.

shipping included for the contiguous United StatesThe crystal clear 4mm tempered glass panels provide great insulative value, impeccable aesthetics, and a higher degree of safety. Installation is an available option for the greenhouse upon further request and all the customer needs to do is to prepare the site of assembly by leveling it and installing whatever type of flooring is preferred.

janssens greenhousesThe Cathedral Greenhouse is the type of premium greenhouse which adds to the value of your home. It can serve multiple purposes and its superior build quality ensures that it will stay looking new long after it is assembled. With its durability, breathtaking design, and vast interior, the Janssens Cathedral Greenhouse is sure to become a showpiece for many years to come.

Janssens Cathedral Greenhouse from ExacoJanssens Cathedral Greenhouse from Exaco


  • Model: Cathedral
  • UPC: 017783957568
  • Nominal size: 20' width x 15' length
  • Dimensions: 19' 10" width x 15' length x 12' 2" height
  • Second level roof nook dimensions: 5' 4" width x 10' 2" length
  • Side wall height: 6' 8"
  • First gutter height: 6' 8"
  • First ridge height: 9' 1"
  • Second gutter height: 10' 9"
  • Second ridge height: 12' 2"
  • Frame color: your choice of black (RAL 9005), dark green (RAL 6009), beige (RAL 9006), dark gray (RAL 7016), pure white (RAL 9010), or any other custom color
  • Floor space: 298 sq. ft.
  • Roof vents: 4 with spindle openers
  • Includes 1 louver window with automatic opener and clear Lexan cover for use in the winter: 28.5" width x 39" height
  • 2 top hanging side windows
  • 4mm tempered safety glass that is completely clear and thicker than typical greenhouses
  • Vertical glass comes in single pieces for a more seamless look
  • Glass is held in place tightly with rubber seals to prevent heat loss
  • Heavy duty aluminum frame is designed to withstand inclement weather
  • 2 heavy gauge 2.3" x 5.2" aluminum re-enforcement supports (going from front to back)
  • 1 heavy gauge 2.3" x 4" aluminum horizontal roof support frame
  • Paint is electrostatically-applied to frame for a thicker application and better coverage
  • Aluminum-clad, swinging double doors have 56.5" wide opening for easy ingress and include a lock
  • Single sliding door on side with lock
  • Tall sidewall height gives plenty of working room inside the greenhouse without having  to stoop and more room for shelving
  • Gutter and downpipes included to divert rainwater away from the foundation
  • Includes condensation gutters on the interior
  • Stainless steel fasteners withstand the elements
  • Includes decorative roof finials
  • Integrated base frame
  • T.U.V. & GS tested and approved, which is similar to UL testing & listing
  • Beautiful design to fit any garden
  • Note: Please be sure to check your local building code for any required permits
  • This Janssens greenhouse is special ordered by Exaco and individually inspected and packed with up to a 4 to 6 week lead time and so can not be returned; please let us know if you have any questions at all
  • Ships in multiple boxes via motor freight
  • Custom made and imported from Belgium by Exaco Trading Co. and shipped from their Austin, TX warehouse
  • Weight: ~2500 lbs.
  • Exaco and Janssens and Greenhouse Nation stand by their greenhouses and work to make you completely satisfied
  • 15 year limited warranty on frame and glass is guaranteed to arrive intact


Color - The Cathedral is available directly from Janssens in five colors, beige (RAL 9006), black (RAL 9005), dark green (RAL 6009), dark gray (RAL 7016), and pure white (RAL 9010). Any other custom color is available for an additional cost.

Extra Door - An extra single or double sliding door can be added to back or side of the greenhouse to provide extra access and cross ventilation for your greenhouse. In addition an extra single or double hinged doors can be added to the greenhouse. In fact these extra doors can go on any side of the greenhouse.

Extra Waterproofing - As this structure uses single pane glass, it is designed for use as high end greenhouse or a tea room style of pavilion with outdoor furniture. It is virtually 99% watertight, but is not absolutely watertight, so it is not recommended for use with electronics such permanently installed televisions or computers.

With all single pane glass structures, unless strict temperature and humidity control systems are installed, the interior can be prone to condensation at certain times of the year in parts of the country, particularly in the fall. High humidity and fast changing temperatures, such as during dawn and dusk, also can cause excess condensation.

The installation team can spend much extra time caulking every individual piece so that the completed structure is virtually 99.9% watertight, and this will add perhaps an entire extra day of installation time.

Installation - The Cathedral can be installed on site by Exaco's expert staff. Two team members will travel to your location and assemble the entire structure in 2-3 days. The customer is responsible for site preparation and moving the greenhouse components to the site. A concrete foundation is ideal as specified in the manual.

Janssens Royal Victorian Louver WindowLouver Window - Extra louver windows are available for this Victorian greenhouse to provide additional ventilation. Automatic Louver Window Openers that function just like the automatic roof vent openers are also available, as are Louver Window Lexan Covers, clear covers for the louver window to keep the greenhouse sealed during the winter.

Janssens Royal Victorian Louver Window Lexan Cover

Janssens Victorian Slat ShelvingVictorian Slat Shelving - The most affordable shelving for Victorian greenhouses comes in 2-slat or 5-flat sizes and in green or black. The 2-slat shelving is 9" wide x 59" long and the 5-slat shelving is 21" wide x 59" long.

Threshold - The standard threshold at the double hinged doors of the Cathedral greenhouse is 4.5" as this is the size of the integrated base frame around the perimeter of the structure. Customers will keep the standard threshold if they prefer the look of a uniform base around the entire greenhouse. The Cathedral has an option of a lowered hinged door. This means that each door is almost 4" longer at the bottom so that there is almost no threshold, just a 1" high angle bar for support.

Janssens Wheelbarrow Access PlateWheelbarrow Access Plate - A heavy-duty aluminum access plate is available to serve as a ramp for wheelbarrows over the threshold of your greenhouse. The plate is 21" long on each side x 19.5" wide x 1.75" high in the middle where it is hinged.

Janssens Wheelbarrow Access Plate

Factory Diagrams

Janssens Cathedral Greenhouse diagram

Janssens Cathedral Greenhouse diagram

Janssens Cathedral Greenhouse diagram

Janssens Cathedral Greenhouse diagram

Janssens Cathedral Greenhouse diagram

Janssens Cathedral Greenhouse diagram

Janssens Product Details

Janssens Greenhouse Foundation Detail

Janssens Greenhouse Louver Window

Janssens Greenhouse Roof Window

Janssens Greenhouse Sliding Door

Janssens Greenhouse Hinged Door (only available for Royal Victorian greenhouses)

Janssens Royal Victorian Orangerie Greenhouse

Janssens Retro Victorian Greenhouse

Janssens Junior Orangerie Greenhouse

About Janssens NV

Janssens NV Greenhouse FactoryFor over 70 years, Janssens NV has been engineering, manufacturing, and distributing premium greenhouses throughout the world. The company began as a maker of wooden arches for greenhouses, sports venues, and factories and was founded by Constant Janssens. He was soon joined by his son Rene, and later Rene's son, Peter, who joined the Engineering and Technical Services department.

The 300 square meter factory Constant began with was later expanded to 1250 square meters in 1962, only to be doubled just a few years after that. By 1996, the company's development and design department had become fully computerized to ensure that all structures were engineered in the most efficient manner possible.Janssens NV Greenhouse Factory

In 2009, even more automated production equipment was introduced and now 70% of their structures are exported from Belgium to the rest of Europe and the United States.

Today the Janssens state of the art factory is approximately 6500 square meters large and employs all the latest quality control techniques and aluminum processing equipment to ensure the very highest build quality.

About Exaco Trading Co.

Exaco Trading Co.Exaco Trading Co. began in 1987 as importer and distributor of a home paint mixing accessory called the Exomixer. Since then the family owned company has expanded its line considerably to include many different home and garden products, including some of the very best greenhouses from Europe. The company is led by CEO Kimberly Tyson Cook, formerly an award winning business reporter for the Austin American-Statesman, and Andrew Cook, the VP of Sales and Marketing.

Andrew travels to Europe to check on the manufacturers in person several times a year and has become a leading national authority on all things greenhouse related. He has appeared in many gardening articles and television programs nationally. In fact Andrew is available for phone support for customers during the installation of any of the premier greenhouses that Exaco distributes from its large Austin, TX warehouse.

Manuals: Janssens Cathedral Greenhouse Manual [14,180 k] 
Manuals: Janssens Cathedral Greenhouse Manual (addendum) [17,657 k] 
Manuals: Janssens Cathedral Greenhouse Profiles Overview [130 k] 
Manuals: Janssens Cathedral Greenhouse Foundation Notes [2,344 k] 
Manuals: Janssens Victorian Greenhouse Warranty [110 k] 
Manuals: Janssens Cathedral Greenhouse Schematics [19,963 k] 
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