Grandio Greenhouse Summit 12x20

SKU: SUMMIT-1220

$6,499.00 $7,474.00

You Save: $975.00 14%

✅ #1 Authorized Online Dealer

🚚 Free Shipping & No Sales Tax

💲 We Beat The Lowest Price

📦 Fast 4-7 Day Delivery

❓Questions? Call Our Experts: xxx-xxx-xxxx

Kit Options

Why Choose the Summit 12x20 Greenhouse Kit for Year-Round Gardening?

The Summit 12x20 Greenhouse Kit delivers a spacious, durable, and dependable growing environment for every season. Engineered with a heavy-duty aluminum frame and 10mm twin-wall polycarbonate panels, this barn-style greenhouse stands strong against tough weather conditions while providing excellent insulation for your plants. Whether you're a gardening beginner or a seasoned grower, this greenhouse offers the perfect blend of size, strength, and style to help your garden thrive all year long.

Key Benefits

All-Season Strength and Protection Built with a 1.6mm thick aluminum frame and UV-protected polycarbonate panels, the Summit greenhouse ensures long-term durability and reliable insulation in any climate. It’s designed to maintain a stable internal environment, keeping your plants safe from harsh wind, snow, or intense sun.

Superior Ventilation and Smooth Access Equipped with ten roof vents, this greenhouse promotes consistent airflow to maintain optimal humidity and temperature levels. The double sliding doors are suspended from above to prevent binding or sticking—making it easy to enter, even while carrying tools or large trays.

Thoughtful, Built-In Features for Stability From built-in rain gutters and a drainage kit to a snow load kit and anchor system, the Summit is ready to perform in every season. Durable nylon door wheels ensure smooth operation, while lockable magnetic handles provide added security.

Specifications

Feature	Description
Frame	Heavy-Duty Aluminum
Color	Powder-Coated Green
Panels	10mm Twin-Wall UV-Protected Polycarbonate
Doors	Bind-Resistant Sliding Double Doors
Latch System	Magnetic Latch with Key Lock
Reinforcement	Cross-Roof Truss & Cross-Corner Bracing
Hardware	Stainless Steel Nuts and Bolts
Rain Gutters	Included
Ventilation	10 Roof Vents with Manual Adjustable Latches
Wind Rating	Up to 76 mph*
Snow Load Rating	Maximum 25 lbs./ft²*

Dimensions

Exterior Dimensions: 12' W x 19.78' L x 9.25' H
Door Opening: 41.5" W x 85" H

Package Options

Basic Kit Includes:

10mm Twin-Wall Polycarbonate Panels
(10) Manual Roof Vents
Rain Gutter System
Drainage Kit
Extreme Snow Load Kit
Flat Mount Anchor Kit

Optional Premium Kit Includes Everything in the Basic Kit, Plus:

(10) Automatic Roof Vent Openers
(2) Packs of 10 Plant Hangers
(1) Trellis Kit
(1) Drip Irrigation Kit
(2) Bottles of 8 oz. Brillianize Panel Cleaner

What Sets Grandio Materials Apart?

Unlike other brands, Grandio uses industrial-grade aluminum framing and UV-protected, 10mm twin-wall panels for better insulation and plant protection. Premium hardware, precision engineering, and advanced safety features make the Summit 12x20 a top choice for serious gardeners.

GRANDIO SUMMIT #1 BASE INSTALLATION

GRANDIO SUMMIT #2 ASSEMBLY INSTRUCTION

GRANDIO SUMMIT #3 PARTS LIST

Order Processing Time: We typically process orders within 1 to 2 days. Please be aware that the deadline for placing orders is 6 p.m. Orders submitted after this time will be processed the next business day. Shipping Information: Expect your order to arrive in 4 to 7 days. We offer free shipping for orders over $200. For orders below $200, a flat shipping fee of $15 applies. Please note that we currently only ship within the United States. International shipping is not available. The majority of our orders are dispatched via third-party freight carriers (18-wheelers). In case your order includes an item that requires freight shipping, we will contact you to schedule a curbside delivery. Ensure that your contact number is correct at checkout. Order Confirmation and Payment: After you place your order, a confirmation email will be sent to you. This confirms that your order is registered in our system and your credit card is authorized for the purchase. Your card will be charged only when the item is shipped. For backordered items, we might hold a charge to reserve the product for you. As soon as we receive your order, we begin processing it immediately!

We're committed to offering you the best prices available online. If you come across a lower price on another online store, let us know, and we'll not just match it — we'll beat it. We aim to give you the assurance that you're getting the best possible price for your purchase. Our Price Match Guarantee, however, comes with certain conditions: Offers like rebates, and 'buy one, get one free' deals are not included.The competing website cannot be a discount or auction platform (for example, eBay). The competing retailer must be an authorized seller of the item in question. The guarantee takes into account the total cost, including the item's price, sales tax, and shipping charges. Please note, our Price Match Guarantee does not apply to exchange orders. If you want us to match or beat a price, just call us today (

At Attachment Selection, we want to make your shopping experience worry-free, so we've simplified our returns and refunds process: Return Period: Items can be returned within 30 days of purchase. Unfortunately, we cannot accept returns after this 30-day period. Shipping Costs for Returns: If your purchase is defective or not as described, we'll cover the return shipping cost. However, if you're returning an item due to a change of mind, the shipping cost will be your responsibility. Defective or Damaged Items: If you receive a defective or damaged product, please inform us within 30 days. We'll arrange a return at no extra cost to you. After receiving and inspecting the item, we'll either replace it or refund you in full, including shipping costs. Returns Due to Change of Mind: If you change your mind about your purchase, you have 30 days to return it. Remember, you will be responsible for the return shipping cost. The item must be unused and in its original packaging. Upon receipt and inspection, we'll refund the cost of the item, excluding shipping charges. Processing Refunds: Once we receive and verify the returned item, we'll initiate a refund to your original payment method within 7 business days. Note that it might take some time for your bank or card to reflect the refund. If you don't see the refund after 10 business days, please contact us at support@athleteselection.com. Please be aware that a restocking fee may apply in certain return scenarios. For any further inquiries regarding our return or refund policy, our Customer Support team is here to help at support@athleteselection.com.

Description

Why Choose the Summit 12x20 Greenhouse Kit for Year-Round Gardening?

Key Benefits

Specifications

Feature	Description
Frame	Heavy-Duty Aluminum
Color	Powder-Coated Green
Panels	10mm Twin-Wall UV-Protected Polycarbonate
Doors	Bind-Resistant Sliding Double Doors
Latch System	Magnetic Latch with Key Lock
Reinforcement	Cross-Roof Truss & Cross-Corner Bracing
Hardware	Stainless Steel Nuts and Bolts
Rain Gutters	Included
Ventilation	10 Roof Vents with Manual Adjustable Latches
Wind Rating	Up to 76 mph*
Snow Load Rating	Maximum 25 lbs./ft²*