Grandio Summit 12x24 Greenhouse Kit 10mm Twin Wall Polycarbonate

Why Choose the Summit 12x24 Greenhouse Kit for Year-Round Gardening Success?

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

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The Grandio Summit 12x24 Greenhouse Kit delivers a spacious, elegant and highly durable growing environment designed for year round gardening. With its tall barn style structure, reinforced aluminum frame and thick 10mm twin wall polycarbonate panels, this greenhouse provides superior insulation and stability in all weather conditions. Whether you are expanding your garden, organizing raised beds or setting up a large propagation area, the Summit 12x24 offers the reliable space you need to grow confidently in every season.

Its wide footprint and generous height give you plenty of room for tall plants, shelving and large gardening tools, making it ideal for both hobbyists and dedicated growers seeking a premium solution.

Why Choose the Summit 12x24 Greenhouse Kit for Your Garden?

Exceptional Durability for Harsh Conditions

Built with a 1.6 mm powder coated aluminum frame, the Summit 12x24 is engineered to outperform PVC structures and lighter greenhouse models.
Paired with 10 mm UV protected twin wall panels that carry an R value of 1.89 and a U value of 0.53, the structure maintains stable temperatures and withstands seasonal storms, wind and winter conditions.

Warm Growing Environment for All Seasons

The insulated design helps retain heat, making it easier to grow through colder months. The twin wall construction keeps interior temperatures more consistent, giving your plants a warm and protected space to thrive year round.

Easy Access and Excellent Ventilation

The sliding double doors operate on a top hanging track with durable nylon wheels to prevent jamming and ensure long lasting smooth movement.
Twelve roof vents allow for strong airflow, helping manage heat and humidity while creating an ideal environment for healthy plant growth.
Heavy duty lockable door handles add security and convenience.

Packed with Helpful Features

The Summit 12x24 includes rain gutters, a drain kit, an extreme snow load kit and a flat mount anchor kit. These additions improve drainage, stability and long term structural integrity, making the greenhouse fully equipped for challenging climates and long term use

BENEFITS

• Exceptional Durability for Harsh Environments: Made from a 1.6mm profile aluminum frame, the Summit 12x24 offers unmatched strength and resilience, designed to withstand challenging weather conditions. This heavy-duty structure ensures that your greenhouse will endure season after season, providing a safe haven for your plants regardless of outside conditions.

• Keeps Your Plants Warm: With its thick 10mm twin-wall polycarbonate panels, the Summit keeps heat inside, so you can grow plants even when it’s chilly outside. This insulation helps maintain steady temperatures, creating a cozy spot for your garden to thrive year-round.

• Easy and Convenient Design: Enjoy easy entry with smooth-gliding sliding doors that hang from above, preventing jams and adding extra strength. Made with quality nylon wheels and solid brass bolts, these doors are built to last and stay in great shape. Lockable, heavy-duty handles add security, while twelve roof windows bring in fresh air, keeping the greenhouse comfortable for your plants.

• Packed with Helpful Features: This greenhouse comes with rain gutters, a drain kit, and a snow load kit, providing everything you need to take care of your plants. The Flat Mount Anchor Kit keeps the greenhouse stable, making it a reliable choice for both beginner and experienced gardeners.

The Summit 12x24 Greenhouse Kit offers a blend of durability, quality, and functionality, making it a fantastic investment for gardeners dedicated to year-round growing.

SPECIFICATIONS

DIMENSIONS

Actual Size: 12' W x 23.68' 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
• (12) Roof Windows
• Rain Gutters
• Drain Kit
• Extreme Snow Load Kit
• Flat Mount Anchor Kit

Optional Premium Kit Includes:

• 10mm Twin-Wall Panels
• (12) Roof Window
• Rain Gutters
• Base Kit
• Drain Kit
• Extreme Snow Load Kit
• Flat Mount Anchor Kit
• (12) 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