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Questions? Call Us at 1-800-540-9051

Grandio Summit 12x12 Greenhouse

Save 22% Save 22%
Original price $5,799.00
Original price $5,799.00 - Original price $5,999.00
Original price $5,799.00
Current price $ 4,499 .00
$4,499.00 - $4,979.00
Current price $ 4,499 .00

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Find a better price? We will beat it!If you find this item cheaper elsewhere (price plus shipping and taxes), please email or call us.*We do not price match past orders, local stores, prices below our costs, and the item must be in stock.

Find a better price? We will beat it!

If you find this item cheaper elsewhere (price plus shipping and taxes), please email or call us.

*We do not price match past orders, local stores, prices below our costs, and the item must be in stock.

Why Pick the Summit 12x12 Greenhouse Kit for Your Garden?

Actual size: 12' W × 12' L × 9.25' H Sizes: 12x8, 12x12, 12x16, 12x20, 12x24, 12x28, 12x32 Panels: 10mm twin-wall polycarbonate (R≈1.89, U≈0.53) Frame: Heavy Duty Aluminum Ventilation: (6) roof vents + rain gutters Ratings: wind up to 76 mph; snow up to 25 lb/ft²*

The Summit 12x12 Greenhouse Kit is perfect for gardeners looking for a strong, good-looking greenhouse that works well all year round. Its sturdy aluminum frame and thick panels keep plants safe and warm in all kinds of weather. With its roomy, barn-style shape, this greenhouse offers plenty of space to grow plants while adding charm to any yard.

BENEFITS

  • Strong and Weather-Ready: The Summit 12x12 features a heavy-duty 1.6mm aluminum frame and 10mm twin-wall polycarbonate panels, designed to withstand tough weather and keep your plants comfortable. The UV-protected 10mm paneling has an (R) value of 1.89* and a heat loss (U) value of 0.53, this helps keep temperatures stable, giving you a safe place to grow plants all year.
  • Great Airflow and Easy Access: With six roof windows and easy-glide double doors, this greenhouse provides plenty of airflow, essential for healthy plant growth. The doors hung from above to avoid sticking and are made from tough materials, so they slide open and shut smoothly.
  • Added Convenience and Stability: Equipped with rain gutters, a drain kit, an extreme snow load kit, and a flat mount anchor kit, the Summit 12x12 is ready for any conditions. The door wheels are made from tough nylon, and the lockable handles provide security. These added features help make the greenhouse practical, stable, and durable, ensuring it lasts season after season.

The Summit 12x12 Greenhouse Kit gives you a dependable, attractive space to grow your plants all year, making it a great choice for every gardener.

SPECIFICATIONS

Frame Heavy Duty Aluminum
Color Powder-Coated Green
Panels 10mm Twin-wall UV-protected Polycarbonate
Doors Bind-resistant Sliding Double doors
Latch Magnetic latch doors with key lock
Reinforcement Cross-roof truss and cross- corner bracing
Hardware Stainless steel nuts and bolts
Rain Gutters Yes
Ventilation 6 Roof vents with adjustable manual openers/latches
Wind Rating Withstands winds up to 76 mph*
Snow Rating Maximum snow load of 25lbs./ft² of snow*

DIMENSIONS

  • Actual Size: 12' W x 12' L x 9.25' H
  • Door Size: 41.5" W x 85" H
grandio summit 12x12 greenhouse kit dimensions

GRANDIO GREENHOUSE MATERIALS VS OTHER BRANDS


WHAT'S INCLUDED IN THE PACKAGE?

Basic Kit Includes:

  • 10mm Twin-Wall Panels
  • (6) Roof Windows
  • Rain Gutters
  • Drain Kit
  • Extreme Snow Load Kit
  • Flat Mount Anchor Kit

Optional Premium Kit Includes:

  • 10mm Twin-Wall Panels
  • (6) Roof Window
  • Rain Gutters
  • Base Kit
  • Drain Kit
  • Extreme Snow Load Kit
  • Flat Mount Anchor Kit
  • (4) Auto Roof Vent Openers
  • (1) Pack of 10 Plant Hangers
  • (1) Trellis Kit
  • (1) Drip Kit
  • (1) 8 oz. Brillianize Cleaner

ASSEMBLY VIDEO

Grandio Summit 12x16 Assembly Time-lapse - 1 minute video

Grandio Ascent 8x8 Assembly - 11 minute video

Grandio Summit Weather Stripping Installation

GRANDIO SUMMIT #1 BASE INSTALLATION

GRANDIO SUMMIT #2 ASSEMBLY INSTRUCTION

GRANDIO SUMMIT #3 PARTS LIST

Feature

Grandio Element 6x12 Greenhouse

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Grandio Ascent 8x12 Greenhouse

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Grandio Elite 8x12 Greenhouse

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Grandio Summit 12x12 Greenhouse

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Footprint (W x D) 6' x 12' 8' x 12' 8' x 12' 12' x 12'
Total Area 72 sq ft 96 sq ft 96 sq ft 144 sq ft
Peak Height 7'6" 7'9" 8' 9.25'
Sidewall Height 5'5" 5'5" 5'5" 5'5"
Frame Material Heavy-duty Aluminum Heavy-duty aluminum Heavy-duty aluminum Heavy-duty aluminum
Panel Material 10mm Twin-wall UV-protected Polycarbonate 6mm Twin-wall UV-protected Polycarbonate 10mm Twin-wall UV-protected Polycarbonate 10mm Twin-wall UV-protected Polycarbonate
Latch Easy-latch doors with double-ball catch Easy-latch doors with double-ball catch Easy-latch doors with double-ball catch Magnetic latch doors with key lock
Door Type Sliding Double Sliding Double Sliding Double Sliding Double
Ventilation (3) Roof vents (3) Roof vents (3) Roof vents (6) Roof vents
Warranty Lifetime frame / 10-year panels Lifetime frame / 10-year panels Lifetime frame / 10-year panels Lifetime frame / 10-year panels

Compare with Other Greenhouse Brands

Feature

Grandio Summit 12x12 Greenhouse

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Riverstone Monticello Black Premium Greenhouse

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EZ-Fit Greenhouse Kit

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Little Cottage Co. Colonial Gable Greenhouse

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Size 12x8, 12x12, 12x16, 12x20, 12x24, 12x28, 12x32 8x8, 8x12, 8x16, 8x20, 8x24 8x8, 8x10, 8x12, 10x12, 10x14, 10x16, 12x16, 12x20, 12x24 8x8, 8x12, 8x16, 10x12, 10x14, 10x16
Frame Material Powder-coated heavy-duty aluminum (1.6 mm thick) Commercial-grade extruded aluminum (black powder-coated) LP SmartSide® engineered wood siding with treated wood frame LP SmartSide® engineered wood siding with treated wood frame
Panel Material 10mm Twin-wall Polycarbonate 8mm Twin-wall Polycarbonate Corrugated polycarbonate roofing panels Corrugated polycarbonate roofing panels
Door Type Sliding double doors Hinged double doors Single door with 2 transom windows
(Optional Double Door Available)
Colonial Dutch door with 1 transom window
Ventilation 6 roof vents 1 Automatic roof vent(s) Operable windows (with screens) + 2 gable-end air vents Operable windows (with screens) + 2 gable-end air vents
Color Green powder-coat aluminum frame • clear polycarbonate panels Black powder-coat aluminum frame • clear polycarbonate panels Primed and ready to paint Primed and ready to paint
Included Accessories Rain gutters, snow load kit, anchoring kit Rain gutters, roof vent, base kit Shelves on 3 sides Shelves on 3 sides, hanging rods, 2 louvers
Optional Accessories

Drain Kit - Downspout for Grandio Greenhouse Gutter Systems, designed for installation at each of the four corners of the greenhouse. It’s made to be installed directly into the aluminum frame and gutter of the greenhouse. The easy-to-install downspout drain kit includes (4) 20mm black pipes, (4) gutter attachment gaskets, and (4) side wall brackets with screws. One kit has everything needed to add downspouts to a Grandio Greenhouse.

Automatic Roof Vent Opener - Automatically opens and closes the roof vent window based on temperature changes. The opener contains a metal cylinder with a mineral that expands when heated, pushing a piston to open the vent. When the temperature cools, the mineral contracts, and a spring closes the vent, resetting the piston. The vent opens and closes gradually, allowing the right amount of airflow for cooling.

Auto Louver Window Opener - Automatically opens and closes the louver window as the temperature changes. The opener has a metal cylinder with a mineral that expands when heated, pushing a piston to open the vent. As the temperature cools, the mineral contracts, and a spring closes the vent and resets the piston. The vent opens and closes gradually, providing just the right amount of airflow for cooling. This Auto Louver Opener attaches to the left side of your louver window.

Louver Window - add more ventilation to your greenhouse. Louver window frame comes powder coated in green, with 6mm twin wall polycarbonate panels.

The Drip Irrigation Watering Kit - is a water-efficient system designed for shrubs, trees, flowers, and bushes, covering up to 150 square feet with easy expandability. It's a DIY-friendly installation with no gluing required, using high-quality UV-resistant materials. The kit includes 24 pressure-compensating drippers (20 at 1 GPH, 2 at 2 GPH, and 2 at 4 GPH) for consistent water delivery to plant roots. A backflow preventer ensures water safety by preventing siphoning into the main supply.

Moisture Control Kit - featuring Anti Dust Tape and Waterproof All-Weather Silicone Caulk, protects your Grandio Greenhouse from insects, dirt, mold, and algae. The tape's 45-micron filters allow condensation to escape while preventing algae and mold growth with a fungicidal coating. Combined with the silicone caulk, this kit ensures long-lasting protection and maintains the greenhouse's pristine condition.

Shade Net - are essential for regulating greenhouse temperatures, especially during sunny spring, autumn, and summer days. Designed to reduce intense sunlight by 50%, they help keep your greenhouse cooler and prevent overheating.

Plant Hangers - These versatile plastic hangers are designed for greenhouse use, supporting shade cloths, hanging baskets with quarter-inch hooks, and stringing taller plants or vines. Easy to install, they simply twist into the roof rafter channels.

SHIPPING INFO

Lead Time is 1 to 2 days. Orders typically arrive within 1-7 business days, depending on your location:

  • West: 2-4 days
  • Northwest: 1-3 days
  • Southwest: 3-5 days
  • Midwest: 4-6 days
  • East: 5-7 days

Note: Delivery times are estimates and exclude order processing time. Delays may occur due to weather or carrier issues.

Frequently Asked Questions

Is the Grandio Summit 12x12 Greenhouse strong enough for heavy snow and wind?

Yes, the Grandio Summit 12x12 is engineered for tough weather. It includes an Extreme Snow Load Kit and can handle up to 25 lbs./ft² of snow. It’s also wind-rated to withstand up to 76 mph*, making it ideal for high-wind areas like the Midwest or the Rockies.

Does this greenhouse work for all-season growing?

Absolutely. The 10mm twin-wall polycarbonate panels provide insulation with an R-value of 1.89 and a U-value of 0.53, helping maintain steady temperatures year-round. This is especially useful for year-round gardening in regions like the Pacific Northwest or the Northeast.

What’s included with the standard Summit 12x12 greenhouse kit?

The standard kit comes with 10mm twin-wall panels, six roof vents, sliding double doors, rain gutters, a drain kit, a snow load kit, and a flat mount anchor kit—everything you need to start growing in most climates.

Is the frame rust-proof?

Yes. The frame is made of powder-coated heavy-duty aluminum (1.6mm thick), which resists rust and corrosion, even in humid climates like Florida or coastal California.

How is ventilation handled inside the Summit greenhouse?

The Summit 12x12 includes six manually adjustable roof vents to allow heat and humidity to escape. Optional automatic vent openers and louver windows are available for even better airflow management in warmer zones like the South or Southwest.

Does this model come with a warranty?

Yes, Grandio provides a lifetime warranty on the aluminum frame and a 10-year warranty on the polycarbonate panels, giving long-term peace of mind regardless of location.

QUESTIONS & ANSWERS

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Don't Take Our Word For it! Here's What Our Customers Think:

Hats off to Homestead Supplier for superior customer service - these guys go above and beyond to answer all my questions. We purchased the Beach House shed for some extra storage but ended up using it as a backyard playhouse for the kids :). Now we have to buy another shed lol... The shed is great, sturdy, and would recommend to others.

- Sam B.

I found the buying experience to be far better than expected. Very easy to order, received immediate order confirmation, excellent customer service, order showed earlier than expected and in excellent condition. Would definitely recommend

- Dean G.

After 7 months of waiting for our pool to be completed, we are thrilled to have gotten our new shed built. It perfectly completes our backyard renovation. We love it! The instructions were clear, and the building is sturdy. We’ve had a number of inquiries about who we bought our shed kit from.

- Karen E.

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