Skip to content
Limited Free Shipping • Free Pickup (Select Locations) • Secure Checkout Limited Free Shipping • Free Pickup (Select Locations)
CURRENTLY IN STOCK
TMG-GH821

TMG Heavy Series™ 8' x 20' Greenhouse Kit with Galvanized Steel Frame, Polycarb Roof and Crystal-Clear Walls TMG-GH821

8' x 20' Greenhouse with Galvanized Steel Frame, Polycarbonate Twin-Wall Roof and Crystal-Clear Solid Walls
CURRENTLY IN STOCK
SKU TMG-GH821
$2,499.00 CAD - $2,499.00 CAD
$2,499.00 CAD
$2,499.00 CAD - $2,499.00 CAD
$2,499.00 CAD
$2,499.00 CAD

FREE

shipping to most locations in

Canada

Delivered in 10 to 15 business days Learn More
GRAB IT SOON - ONLY 4 LEFT IN STOCK
1-877-761-2819
Product Manual
Find Parts

Features

Durable & Weather-Resistant

The galvanized steel frame resists rust and corrosion, ensuring long-lasting outdoor use.

Warm & Energy-Efficient

Twin-wall 4 mm polycarbonate roof panels trap solar heat and diffuse sunlight to keep plants cozy.

UV-Protected & Naturally Bright

Crystal-clear panels let in sunlight while blocking UV rays—no need for artificial lighting.

Spacious & Accessible

A wide 44" door provides easy access for tools, carts, and new plants.

Ventilated & Simple to Assemble

Manual roof vents control airflow, and the panels lock into place for quick setup.

Specifications

  • Exact floor footprint: 7-4/5’ (W) x 19-2/3’ (L)
  • Sidewall height: 69”
  • Ridge height: 97”
  • Truss spacing: 39”
  • Bi-parting swing open door: 44” (W) x 78” (H)
  • 4mm Polycarbonate twin-wall roof panels and 2mm clear solid wall panels
  • Roof vents: 2

Product Description

The TMG-GH821 Greenhouse is a high-quality solution for backyard gardeners and commercial growers looking to extend their growing season. Featuring UV-protected 4 mm twin-wall polycarbonate panels, this greenhouse allows sunlight to diffuse evenly while protecting plants from harsh weather. The crystal-clear poly walls not only support healthy plant growth but also give the structure a clean, modern look that blends beautifully into any backyard setting. A galvanized steel frame with ground base bars provides a stable and durable structure, ideal for year-round use in a variety of climates. With approximately 160 square feet of growing space, there's plenty of room for vegetables, herbs, flowers, and seedlings to thrive. Manual roof vents help regulate airflow and temperature, while the greenhouse design retains solar heat to create a warm, consistent environment. The TMG-GH821 offers a professional growing space built for lasting performance and healthy plant development. TMG Industrial carries a wide variety of cold frame tunnel greenhouse grow tents designed for needs from a backyard hobby gardener to a sizeable commercial produce grower. With over 30 different sizes and styles available, TMG Industrial has become one of the leading cold frame greenhouse distributors within Canada and the USA. Other greenhouse models: TMG Industrial Greenhouses

Shipping Information

Your order will be shipped from one of our main warehouses in Canada. Typically, we process and ship orders within 2 to 3 business days. Delivery time varies based on your location and accessibility, with most orders arriving within 10 to 15 business days.

  • This product is packed in a wood crate shipping box
  • Shipping dimension: 87” x 45” x 16” (L x W x H)
  • Shipping weight: 635 lb
Shipping from Richmond, BC, or Mississauga, ON
What happens after you place your order?
TMG Heavy Series™ 8' x 20' Greenhouse Kit with Galvanized Steel Frame, Polycarb Roof and Crystal-Clear Walls TMG-GH821

Warranty

We know that when you invest in equipment, you're counting on it to perform day in and day out. At TMG Industrial, that trust means everything to us. That’s why we include a 1-year Warranty with every product we sell—because you deserve confidence with every purchase.

Our warranty is there to make sure your equipment stays reliable across the seasons, covering any issues caused by manufacturing defects in materials or workmanship. From fieldwork to property maintenance, you can count on your TMG equipment to deliver.

More than just warranty coverage, we’re committed to supporting you throughout the life of your machine. Our customer service team is here to help, whether you need technical advice, troubleshooting, or parts support.

For full warranty terms, please see our warranty policy
Back to top
01
In-Store Pickup orders are ready by appointment only, 24 hours after payment has been received
02
Credit card owner must be on site with ID and credit card used to place the order
03
If the order is arranged for a third party pickup (a freight company, family members or friends), the order must be paid through EFT (electronic fund transfer).
CALL TO ORDER
Hours: Mon-Fri 9AM-4PM local time
In-Store Pickup orders must be picked up within 5 business days, after which the discount price is voided.

Warehouse Pick-up Price Promo



Only to in-person self-pickup at our Warehouses in Richmond, Montreal and Mississauga

This offer is not applicable with any other promotions or for online orders, and is limited to one item per person only.

Please note that prices are subject to change.
VIEW ALL DEALS
Hours: Mon-Fri 9AM-4PM local time
📞 1-877-761-2819 7 Days a Week