Grandio Summit 12x16 Greenhouse Kit 10mm Twin Wall Polycarbonate

Why Pick the Summit 12x16 Greenhouse Kit for Your Garden?

Now accepting backorders — stock expected to arrive by mid to late December!

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The Grandio Summit 12x16 Greenhouse Kit gives you a durable, spacious and efficient growing space that works in every season. Built with a reinforced aluminum frame and insulated 10mm twin wall polycarbonate panels, this greenhouse is engineered to keep your plants protected through heat, cold and seasonal storms. The attractive barn style design offers excellent headroom and wide growing space, making it ideal for both beginners and experienced gardeners who want year round performance.

Whether you are cultivating vegetables, overwintering plants or starting a larger gardening project, the Summit 12x16 delivers the reliability, size and strength you need.

Why Pick the Summit 12x16 Greenhouse Kit for Your Garden?

Built for Tough Weather and Long Term Use

The Summit 12x16 is built with a 1.6 mm powder coated aluminum frame that provides exceptional strength. Combined with 10 mm UV protected twin wall polycarbonate panels that carry an R value of 1.89 and a U value of 0.53, the structure helps maintain consistent interior temperatures and withstand demanding conditions throughout the seasons.

Excellent Ventilation and Smooth Entry

Eight roof windows provide strong airflow to help regulate humidity and temperature, keeping your plants healthy throughout the year.
The sliding double doors are top hung to prevent jamming and built with durable nylon wheels for long lasting performance. The magnetic latch with key lock adds convenience and security.

Added Features for Stability and Convenience

The Summit 12x16 comes ready for year round use with included rain gutters, a drain kit, an extreme snow load kit and a flat mount anchor kit. These features improve durability, water management and overall stability, giving you confidence that your greenhouse is built to last.

BENEFITS

• Built for Tough Conditions: The Summit 12x16 is crafted with a strong 1.6mm aluminum frame and 10mm twin-wall polycarbonate panels that help keep temperatures stable inside, making it a great option for growing in any season. Its solid structure ensures it can handle various weather conditions, so you can garden confidently year-round.

• Excellent Airflow and Easy Entry: This greenhouse has eight roof windows for plenty of fresh air, essential for keeping plants healthy and happy. The smooth-sliding double doors are hung from above, preventing any jams, and they’re built with durable materials to withstand frequent use, ensuring easy access without hassle.

• Extra Features for Convenience and Stability: The Summit 12x16 comes with helpful additions like rain gutters, a drain kit, a snow load kit, and an anchor kit to keep it steady in any conditions. The doors have durable nylon wheels and lockable handles for security. These features make it low-maintenance and reliable, so you can enjoy it for many seasons to come.

The Summit 12x16 Greenhouse Kit gives you a dependable, spacious, and easy-to-use growing space, making it a great choice for any gardener looking to grow plants all year long.

SPECIFICATIONS

DIMENSIONS

Actual Size: 12' W x 15.89' L x 9.25' H

Door Size: 41.5" W x 85" H

GRANDIO GREENHOUSE MATERIALS VS OTHER BRANDS

WHAT'S INCLUDED IN THE PACKAGE?

Basic Kit Includes:

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

Optional Premium Kit Includes:

• 10mm Twin-Wall Panels
• (8) Roof Window
• Rain Gutters
• Base Kit
• Drain Kit
• Extreme Snow Load Kit
• Flat Mount Anchor Kit
• (8) Auto Roof Vent Openers
• (2) Pack of 10 Plant Hangers
• (1) Trellis Kit
• (1) Drip Kit
• (2) 8 oz. Brillianize Cleaner

ASSEMBLY VIDEO

GRANDIO SUMMIT #1 BASE INSTALLATION

GRANDIO SUMMIT #2 ASSEMBLY INSTRUCTION

GRANDIO SUMMIT #3 PARTS LIST

Compare Grandio Greenhouse Models

Compare with Other Greenhouse Brands

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.

FAQ