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Grandio Greenhouses

Grandio Summit 12x28 #SUMMIT-1228

$9,699.00
$9,499.00
$9,699.00
$9,499.00
Anchor Option:
Premium Upgrade:

Estimated shipping time

Standard delivery typically ranges from 4 to 7 business days, subject to regional logistics and product availability.

What is your Return Policy?
1. Return Window & Eligibility
  • Timeframe: You have 30 days from the date of receipt to initiate a return.
  • Condition: Items must be unused, undamaged, and in their original packaging with all tags attached.
  • Proof of Purchase: A receipt or order number is required for all requests.
2. Fees & Shipping
  • Restocking Fee: Returns due to "change of mind" are subject to a 20% restocking fee, which is deducted from your refund.
  • Shipping Costs: Customers are responsible for paying all return shipping fees. It is recommended to use a trackable service (USPS, UPS, or FedEx).
3. Damages, Defects, & Issues
  • Damaged/Defective Goods: Must be reported within 7 days of delivery with photo/video evidence. Shorestead will provide a replacement or a full refund.
  • Lost Packages: If an order does not arrive within 3–5 business days, contact support for an investigation.
  • Incorrect Items: Contact support immediately to arrange an exchange for the correct product.
4. Non-Returnable Items

The following cannot be returned or refunded:

  • Custom or personalized products.
  • Gift cards (valid for 1 year).
  • Perishable or sanitary goods (unless unopened).
5. Refund Process
  • Approval: Refunds are only issued after the item is received and inspected.
  • Timeline: Once approved, refunds are processed to the original payment method within 5–7 business days.
  • Cancellations: Full refunds are available if you cancel within 24 hours of order placement (provided the item hasn't shipped).
How to Initiate a Return
  1. Contact Support: Email support@shorestead.com or call (260) 400-3966.
  2. Get Authorization: Obtain a Return Merchandise Authorization (RMA) number.
  3. Ship Promptly: Once authorized, you must ship the item back within 7 days.

What is included:
Normal Package
  • 10mm Polycarbonate Panels
  • 14 Roof Vents
  • Built-In Rain Gutters
  • Snow Load Kit Included
  • Cross Roof Trusses and Cross Corner Bracing
  • Bind Resistant Double Sliding Door
  • Magnetic Latch with Key Lock
  • Assembly Tools Included

Premium Upgrade $1160.00 $1588.00 You Save $428.00
  • 14 Roof Vent Auto Openers
  • 20 Plant Hangers
  • 2 Brillianize Anti-Static Panel Cleaner
  • 1 Trellising Kit
  • 1 Drip Irrigation Kit

Key Features
  • Wide, Lockable, Double Sliding Doors
  • Advanced Ventilation & All-Weather Performance
  • Impressive 9.25' Peak Height Maximum Headroom & Vertical Space
  • Exceptional Year-Round Insulation
  • Heavy-Duty Construction & Rust Proof

 

Discover the Features of the Grand Summit 12x28 Greenhouses

 

Welcome to the Grandio Summit Greenhouse

This is the ultimate large-format greenhouse for serious gardeners — built commercial-grade yet perfect for dedicated hobbyists.

With an impressive 9.25-foot peak height, over 12 feet of width, and massive sliding doors, the Summit delivers exceptional headroom and spacious growing area. Its bold barn-style design combines rugged strength with beautiful aesthetics that stand out in any backyard or garden.

Crafted with premium 10mm twin-wall polycarbonate panels and Grandio’s heaviest-duty powder-coated aluminum frame, the Summit offers superior insulation and durability that handles harsh weather with ease. Enjoy smooth-gliding lockable doors, excellent roof ventilation, built-in rain gutters, and the included snow load kit — all backed by Grandio’s reliable long-term warranties.

Robust and Durable Construction

The Grandio Greenhouse Summit boasts a robust design that ensures long-lasting use in varied weather conditions. Built with heavy-duty galvanized steel frames, it provides strong resistance against rust and corrosion. Its durable polycarbonate panels allow optimal light transmission while protecting plants from harsh UV rays. This greenhouse is ideal for gardeners who need a reliable structure that can withstand wind, rain, and snow, securing your plants all year round.

Spacious Interior for Versatile Gardening

With dimensions measuring 12 by 28 feet, the Grandio Greenhouse Summit offers an expansive growing area, ideal for both hobbyists and professional gardeners. The spacious interior allows ample room for shelving, potting benches, and large plant arrangements. This generous space not only maximizes your planting potential but also ensures ease of movement inside the greenhouse, making routine care and harvesting efficient and comfortable.

Efficient Ventilation and Climate Control

This Grandio Greenhouse Summit is equipped with multiple roof vents and adjustable side vents that create an optimal airflow system. Effective ventilation helps regulate temperature and humidity, reducing the risk of mold and promoting healthy plant growth. The greenhouse design supports easy environmental control, making it simpler to create a perfect microclimate for a variety of plants regardless of external weather variations.


Specifications
Height 9' 3"
Width 12'
Length 28'
Frame 1.2 (reinforced areas 1.5mm) Heavy Duty Aluminum
Reinforcement Cross Roof Trusses and Cross Corner Bracing
Frame Color Powder Coated Green
Door Type Bind Resistant Double Sliding Door
Latch Magnetic Latch with Key Lock
Door Dimension 3' 6" x 7' 1.5"
Polycarbonate Panel Thickness 10mm
Number of Roof Vents 14
Rain Gutters Built-In
Steel Base Kit Sold Separately
Snow Load Kit Included
Optional Back Door Kit Yes
Extendable Yes, 4' Lengths
Anchor Options Wood, Concrete, Dirt
Snow Rating Maximum snow load of 25lbs./ft² of snow
Wind Rating Withstands winds up to 76 mph (when anchored properly)

 

Warranty
Aluminum Frame

Lifetime

Polycarbonate Panels

15 Years


Foundation & Anchoring Solutions
Anchoring is an essential part of your greenhouse installation. It protects your Grandio from strong winds and harsh weather that can shift or lift the structure, ensuring long-term stability and durability. Don't skip this critical step — secure your greenhouse properly from day one. Specify which anchor kit you need during checkout.

Wood Anchor

For installation on:

  • Decks
  • Wooden Platforms
  • Timber Bases

The Wood Anchoring Kit is required. It securely fastens the greenhouse to the wood foundation for maximum stability and wind resistance.
Concrete Anchor

For installation on:

  • Pavement
  • Concrete Slabs
  • Other Hard Surfaces

The Concrete Anchoring Kit is required. It securely fastens the greenhouse to the hard surface for maximum stability and wind resistance.
Dirt Anchor

For installation on:

  • Dirt/Earth (Steel Base Kit Required)

The heavy-duty powder-coated steel base adds maximum stability and rigidity, especially in windy or extreme weather conditions. It resists rust and corrosion while providing extra strength to the entire structure — plus it gives you an additional 3" of headroom. Frame-to-base brackets are available for even greater security.

 

Installation Guide

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