Gigant Garden Pavilion Greenhouse by Janssens — Extra Large & Extra Tall
When a standard greenhouse isn't big enough, the Gigant is. This Belgian-made glass pavilion has a tall roofline and a vast, open interior with room for tall plants, collections, potting and entertaining — and it's available in Extra Large and Extra Tall configurations, adding an extra level of sidewall glass for unmatched height.
Doors and windows can be placed where you need them, and we can design a size that fits how you'll use it — a serious growing space, a garden room, or something in between. Need even larger? We also offer custom builds, colors and panels.
Free Shipping · Free Accessories With Your Order · Financing Available · We Coordinate Your Installer · 15-Year Manufacturer Warranty · Price Match
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 and gable-end supports for large spans.
- Standard gutters with downspouts.
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Full-height single glass panes — no overlapping panels, so it looks cleaner and won't collect dirt.
Other Janssens Styles
See the Cathedral Victorian (298 sq. ft. with a cupola roof), or the Royal Victorian in four sizes.
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
What's the difference between Extra Large and Extra Tall?
Extra Large expands the footprint; Extra Tall adds an extra level of sidewall glass for more height. You can combine both — call or text us and we'll configure it with you.
Can it be heated and cooled?
Yes — a mini-split or window unit can be installed, making it comfortable as a garden room.
Can I customize it?
Yes — size, colors, panels and door and window placement can all be custom ordered.
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.
