Grandio Elite 8x20 Greenhouse Kit

160 sq ft of premium barn-style growing space under a full 8 ft roof. The Grandio Elite 8x20 pairs thick 10mm twin-wall polycarbonate (vs 6mm on the Ascent) with a heavy-duty powder-coated aluminum frame, 5 roof vents, and the steel base kit and snow load kit included as standard. Full 8 ft barn-style roof maximizes headroom, interior volume, and curb appeal 10mm twin-wall polycarbonate panels deliver the best insulation in the Grandio hobby lineup for cold-climate growing 1.2 mm heavy-duty aluminum frame is rust proof and withstands winds up to 76 mph when properly anchored Snow load kit included, rated for a maximum snow load of 25 lbs per sq ft Steel base kit included for a rigid perimeter foundation on any surface 5 roof vents, built-in rain gutters, and a 3 ft 8 in x 6 ft 2 in double sliding door Best for: homesteaders and small-scale market gardeners running four or more dedicated zones at once with the Elite's superior 10mm insulation. It offers 25 percent more space than the Elite 8x16. Compared to the 12 ft wide Summit series, the Elite 8x20 is the pick for narrower yards. An optional back door transformation kit creates a walkthrough layout.What's included Powder-coated aluminum frame (green) 10mm twin-wall polycarbonate panels Bind-resistant double sliding doors with easy latch and double ball catch 5 roof vents, built-in rain gutters, and downspouts Heavy-duty steel base kit, snow load kit, and side supports Stainless hardware, assembly tools, and anchoring components Anchor optionsChoose Wood for decks and timber platforms, Concrete for slabs and hard surfaces, or Dirt for direct soil installation with earth anchors. The included steel base kit is used with all three.Premium upgradeThe optional premium upgrade adds 5 automatic roof vent openers, 20 plant hangers, a trellising kit, a drip irrigation kit, and Brillianize anti-static panel cleaner.Specifications Height 8 ft, barn-style roof Width 8 ft Length 20 ft Frame 1.2 mm heavy-duty aluminum, powder coated green Panels 10mm twin-wall polycarbonate Door Bind-resistant double sliding door, 3 ft 8 in x 6 ft 2 in Roof vents 5 Rain gutters Built-in Steel base kit Included Snow load kit Included Back door kit Optional Snow rating 25 lbs/sq ft maximum snow load Wind rating Up to 76 mph when anchored properly Extendable Yes, with Elite extension kits WarrantyLifetime warranty on the aluminum frame and a 15-year limited warranty on the polycarbonate panels.Why buy from Renewable OutdoorsShippingFree ground shipping in the continental US. Orders typically ship in 1 to 2 business days.Warranty supportWe handle warranty claims with Grandio directly so you don't have to chase the manufacturer.Returns30-day returns on unopened items. See our return policy for details.Frequently asked questionsHow does the Elite differ from the Ascent?Two upgrades: 10mm twin-wall panels instead of 6mm for noticeably better heat retention, and the barn-style roof that adds interior volume and a more finished look.Elite 8x20 or Summit?Both use 10mm panels and heavy-duty frames. The Summit is 12 ft wide with a 9.25 ft peak; the Elite 8x20 is 8 ft wide with an 8 ft peak. Pick the Elite for narrower yards, the Summit for maximum width and height.How hard is assembly?Plan a full weekend or two days with a helper; the largest Elite models can take 2 to 3 relaxed days. The kit includes labeled parts, stainless hardware, required tools, and step-by-step instructions.How does it handle wind and snow?The Elite is rated for 76 mph winds and 25 lbs per sq ft of snow when properly anchored, with the snow load kit included as standard. The barn-style roof also sheds snow well.