Cathedral Victorian Greenhouse by Janssens — A Backyard Showstopper
With its soaring roofline and eye-catching cupola, the Cathedral brings height and light to any garden and becomes the centerpiece of your landscape. At 298 sq. ft., it has an open interior for plants, potting and relaxing — and the raised cupola adds real headroom at the peak, not just good looks. Doors and windows can be positioned to fit your layout.
Free Shipping · Free Accessories With Your Order · Financing Available · We Coordinate Your Installer · 15-Year Manufacturer Warranty · Price Match
Standard size: 19'11" x 15' with a 12'2" peak and 6'8" sidewalls, a set of double-hinged doors plus a sliding door, 4 roof vents, 2 push-out side windows and 2 automatic louvres. In Black or Bronze — see the Specifications tab for details. Custom sizes and colors available as special orders.
Built for Strength
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Heavy-duty 17-gauge tubular aluminum frame — larger, thicker and stronger profiles than most greenhouses in its price range.
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4mm tempered safety glass (where many brands use 3mm), TUV and GS tested for resilience to wind and hail.
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Heavy-duty rubber seals hold every pane in place all the way around, for a tight, better-insulated structure.
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Stainless steel hardware that won't rust or corrode.
- Engineered for winds up to 120 mph and a 25 PSF ground snow load.
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Heavy-duty portal frame supports spanning the full width.
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4" foundation frame included, where other brands usually charge extra.
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Full-height single glass panes — no overlapping panels, so it looks cleaner and won't collect dirt.
We'll Package Your Accessories For You
Additional doors, shelving, vents, heating and shade curtains — call or text us and we'll customize the options for your space.
Other Janssens Styles
See the Royal Victorian, the Gigant Garden Pavilion for extra-large and extra-tall builds, or the insulated LIVINGTEN garden room.
Talk to Us
America's leading Janssens dealer. We're experts in greenhouses, sunrooms and garden rooms, and we've been selling Janssens greenhouses — and solutioning them for every type of install — for over 10 years. That long tenure means expert advice on sizing, foundations, knee walls, installation and accessories, and our best price for your project. Please call or text us at 732-806-7959.
FAQ
Why does it have a cupola?
The raised cupola adds extra headroom at the peak and a distinctive silhouette that sets the Cathedral apart from a standard Victorian roofline.
Can I use it as a garden room?
Many owners furnish it for seating or as a studio. Like all single-glazed greenhouses it isn't insulated like a room addition — for a fully insulated garden room, see the LIVINGTEN.
How long does assembly take?
Given the size, most owners budget several days with at least two people — or we'll coordinate an installer for you.
Do I need a permit?
Often, since this is a permanent structure on a foundation — requirements vary by town, so check with your local building department before you order.
What if I have more questions?
Call or text us at 732-806-7959 — texting is the fastest way to reach us. We're happy to help.
