Gigant Greenhouse

The Janssens Gigant greenhouse represents the pinnacle of grand-scale estate engineering and elite horticultural performance. True to its name, this monumental structure features a soaring roofline and a vast, sweeping interior volume designed specifically to accommodate tall tropical canopies, large-scale cultivation projects, and expansive botanical collections that standard greenhouses simply cannot house. Crafted in Belgium by Janssens—a premier family company with over 75 years of master greenhouse craftsmanship—the Gigant merges historic European design heritage with heavy-duty, commercial-grade engineering. With a highly versatile blueprint that allows for completely custom, flexible door and window configurations, this structural marvel can be tailored precisely to match your landscape's architectural layout and your personal growing workflow. Please Note: Because the Gigant is a specialized architectural structure built exclusively to custom specifications, each unit is individually manufactured to order at the Janssens factory in Belgium. Lead times are longer than standard models—a direct reflection of the bespoke craftsmanship required to build a sanctuary of this magnitude. Signature Engineering & Monumental Scale: Grand Volumetric Design: Engineered with an extra-tall roofline and immense square footage, providing superior vertical clearance for mature trees, hanging installations, and multi-tier staging. Heavy-Duty Portal Framing: Built with an ultra-robust, thick-gauge tubular aluminum framework and industrial stainless steel hardware to ensure maximum stability across a massive footprint. Premium Glazing: Wrapped entirely in premium, full-size 4mm tempered safety glass panes for flawless clarity, high wind resistance, and optimal ambient light distribution. Bespoke Ventilation Paths: Features a fully adjustable layout for smooth-gliding access doors and roof windows, enabling you to design the perfect microclimate and traffic flow for your collection. Uncompromising Structural Longevity: A masterful fusion of monumental European aesthetics and low-maintenance, industrial-strength materials built to withstand intense weather and inspire generations. Bespoke Architectural Parameters Available Custom Configurations Custom Widths Available in 13', 15', 17', and 20' widths Custom Lengths Scalable from 13' up to 60' (built in modular 2ft structural increments) Sidewall Heights Standard: 6'8" | High-Profile Custom: 8'4" up to a soaring 9'7" Peak Crest Heights Ranges from 9'4" up to 13'9" (proportionate to width and wall configuration) Roof Pitch 22 degrees (optimized for massive overhead clear-span space) Frame Engineering 17-gauge heavy-duty tubular aluminum integrated with interior portal frames Glazing Options 4mm tempered safety glass or high-insulation 10mm twin-wall polycarbonate (or hybrid mix) Glass Module Widths Standard 28" contemporary panes or upgraded 14" narrow vintage modules Doors & Windows Completely flexible placements. Double hinged doors, roof vents, and push-out side windows added to order Color Finishes Architectural Black, Forest Green, Alpine White, or any custom RAL color palette Architectural Accents Optional stemwall connection kits, Victorian roof ridge cresting, and decorative cross/flower panels Concrete Slab Starting at $5,000 Bluestone/Pavers + $10,000 Brick Knee Wall Starting at $6,000 Freight + $2,000 Assembly Starting at $3,000