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8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal
8' x 20' Greenhouse Kit with Galvanized Steel Frame, TMG Heavy Series, Polycarb Roof and Crystal

TMG-GH821 8′ x 20′ Greenhouse with Galvanized Steel Frame

Original price was: $2,795.00.Current price is: $2,550.00.

Extend your growing season and maximize your agricultural output with the TMG-GH821 Greenhouse Kit.
Designed for both dedicated backyard enthusiasts and commercial growers, this structure provides a robust, climate-controlled environment that thrives in various climates.
Featuring a high-quality galvanized steel frame and a specialized combination of thermal-retaining twin-wall polycarbonate roofing and crystal-clear solid wall panels, this greenhouse ensures your plants receive optimal light diffusion and protection from harsh weather conditions.
With approximately 160 square feet of interior space, it delivers a clean, modern, and professional-grade solution for consistent year-round growth.

Only 2 left in stock (can be backordered)

Free shipping eligibility: this TMG, Stinger, or fuel tank up to 500 gallons qualifies on a Lower 48 order over $1,000. Items over 96 inches, fuel trailers, bridges, loading ramps, and larger fuel tanks require a freight quote.

Key Features

  • Advanced Thermal Insulation: Equipped with 4mm twin-wall polycarbonate roof panels that effectively trap solar heat, maintaining a consistent temperature to support delicate seedlings and year-round plant health.

  • UV-Protected Clarity: Features crystal-clear 2mm solid wall panels that allow for maximum natural light penetration while blocking harmful UV rays, eliminating the need for supplemental artificial lighting.

  • Durable Structural Integrity: Built with a rust-resistant galvanized steel frame and reinforced ground base bars, ensuring long-term stability and performance in outdoor environments.

  • Integrated Airflow Management: Includes manual roof vents that allow for precise regulation of internal temperature and humidity, preventing condensation buildup.

  • Wide Accessibility: Features a spacious 44-inch bi-parting swing door, providing ample clearance for easy transport of tools, carts, and large plant containers.

Technical Specifications

  • Model: TMG-GH821

  • Available Sizes: 8’x10’, 8’x13’, 8’x20’ (this model), 8’x26’

  • Exact Floor Footprint: 7-4/5’ W x 19-2/3’ L

  • Vertical Dimensions:

    • Sidewall Height: 69”

    • Ridge Height: 97”

  • Structural Spacing: 39” truss spacing

  • Door Dimensions: 44” W x 78” H (Bi-parting swing door)

  • Glazing Materials: 4mm Twin-wall polycarbonate (Roof) | 2mm Clear solid polycarbonate (Walls)

  • Ventilation: 2 manual roof vents

Shipping & Delivery

  • Processing Time: 2–3 business days

  • Transit Time: 10–15 business days (subject to regional freight terminal parameters and site accessibility)

  • Packaging Type: Wood crate shipping box

  • Shipping Dimensions: 87” L x 45” W x 16” H

  • Combined Shipping Weight: 635 lbs

Before You Order

  • TMG and Stinger items, plus fuel tanks up to 500 gallons, receive free shipping to the lower 48 states when the cart subtotal exceeds USD 1,000 and the item is not oversized.
  • Products longer than 96 inches, fuel tanks over 500 gallons, fuel trailers, bridges and loading ramps require a freight quote before shipment.
  • Other items below USD 1,000 are available for customer pickup by appointment at Cliffhouse Buildings in Gravois Mills, Missouri; you collect the item and no delivery is included.

Need help before ordering? Call 660-858-8251 or contact us with your delivery ZIP code and equipment details.

Why Order From Cliffhouse Buildings?

  • Missouri-based support for equipment, shelters, attachments, fuel systems, and jobsite products.
  • Secure online checkout with freight and pickup guidance before fulfillment.
  • Customer pickup is available by appointment; you collect the item in Gravois Mills, MO, and no delivery or freight is included. Freight eligibility and delivery costs vary by product and destination.
Load out assistance at Cliffhouse Buildings. We have staff and equipment for loading customer purchases.

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