Grandio Summit Greenhouse

Grandio Summit Greenhouse

If you need a large greenhouse to really spread out, look no further. The Summit is our largest greenhouse kit in both width and height — a fantastic choice for serious home gardeners, commercial operations, school programs, and community gardens. Features our heaviest-duty frame, 10mm twin-wall panels, massive sliding doors, over 9 feet of headroom, and 12 feet of width! Available in sizes from 12×8 up to 12×32.

Key Features

• 12-Foot Width: Widest Grandio greenhouse — room for center aisles, multiple bench rows, and equipment
• 9+ Feet of Headroom: Stand up straight, work tall crops, hang trellises or fans with room to spare
• 10mm Twin-Wall Polycarbonate: Premium insulation, R-value 1.89 — ideal for year-round growing in all climates
• Heaviest-Duty Frame: Extra-thick aluminum profiles engineered for the largest greenhouse size, built to handle maximum wind and snow loads
• Massive Sliding Doors: Wide double-door opening on a top-hung track — no jamming, easy access for tractors and carts
• Roof Vents: Integrated ventilation for temperature control during hot months

Available Sizes

• 12×8: Entry-level wide greenhouse
• 12×12: Square layout, versatile for any growing style
• 12×16: Serious growing space
• 12×20: Commercial-scale footprint
• 12×24: Maximum growing capacity
• 12×28: Extended length for row crops or extensive bench systems
• 12×32: The biggest — full commercial greenhouse

Anchor Kit Options

• No Anchor Kit: If you have a prepared foundation ready
• Flat Mount Concrete/Wood: Mount to concrete slab or wooden deck
• Base Kit Earth Anchor: Powder-coated steel base designed to be buried in the ground or backfilled with gravel — recommended for most Summit installs

The Summit is the greenhouse for growers who need maximum space and durability. Whether you're running a nursery, teaching students, or just want more room to grow, this is the one.

Call us at (307) 417-6686 for help with sizing, site prep, or freight shipping quotes.