Grandio Ascent 8x12 Greenhouse Kit

The most popular Ascent size: 96 sq ft of walk-in growing space under a 7 ft 9 in peak. The Grandio Ascent 8x12 pairs a heavy-duty powder-coated aluminum frame with 6mm twin-wall polycarbonate, wide double sliding doors, and 3 adjustable roof vents, with the steel base kit and snow load kit included as standard. 7 ft 9 in peak height and a 3 ft 6 in x 6 ft double sliding door fit people, wheelbarrows, and large containers 1.2 mm heavy-duty aluminum frame is rust proof and withstands winds up to 76 mph when properly anchored 6mm twin-wall polycarbonate panels insulate and diffuse UV for consistent, healthy growth 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 3 roof vents with multi-level handles plus built-in rain gutters Best for: gardeners running multiple growing zones: seedlings on one side, mature plants on the other, with room left for shelving and grow beds. It offers 50 percent more space than the 8x8. An optional back door transformation kit adds a second entrance for a walkthrough layout.What's included Powder-coated aluminum frame (green) 6mm twin-wall polycarbonate panels Bind-resistant double sliding doors with easy latch and double ball catch 3 roof vents, built-in rain gutters, and downspouts Heavy-duty steel base kit and snow load kit 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 3 automatic roof vent openers, 10 plant hangers, a trellising kit, a drip irrigation kit, and Brillianize anti-static panel cleaner.Specifications Height 7 ft 9 in Width 8 ft Length 12 ft Frame 1.2 mm heavy-duty aluminum, powder coated green Panels 6mm twin-wall polycarbonate Door Bind-resistant double sliding door, 3 ft 6 in x 6 ft Roof vents 3 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 Ascent 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 hard is assembly?Most owners finish in 4 to 8 hours with two people, or one relaxed weekend day. The kit includes labeled parts, stainless hardware, required tools, and step-by-step instructions, and Grandio provides official assembly videos.What foundation do I need?The included steel base kit creates a rigid perimeter frame that works on concrete, wood decks, or bare ground. Just pick the matching anchor option so the hardware fits your surface. Earth installations use L-bolt anchors, often set in concrete for extra hold.Is the 8x12 the right size?The 8x12 is the most popular Ascent because it fits multiple beds, shelving, and comfortable working space without dominating the yard. If you want dedicated propagation areas or year-round production at scale, look at the 8x16 through 8x24.Can it be used year-round?Yes. The twin-wall panels retain heat in cooler months, and the roof vents manage summer temps. Many owners add a small heater for frost protection and shade cloth in peak summer.