This 4 ft. extension kit adds approximately 32 sq. ft. of interior growing area to a compatible greenhouse. It is designed to integrate with the existing frame, glazing system, and structural profile while maintaining a consistent appearance. The extension uses 10 mm polycarbonate panels and a heavy-duty aluminum frame with reinforced areas. It includes 2 roof vents, built-in rain gutters, and a snow-load kit, with 4 selectable anchoring configurations for different installation requirements.

  • Height: 9 ft. 3 in.
  • Width: 12 ft.
  • Extension Length: 4 ft.
  • Additional Growing Area: Approximately 32 sq. ft.
  • Frame: 1.2 mm heavy-duty aluminum with 1.5 mm reinforced areas
  • Frame Color: Green
  • Polycarbonate Panel Thickness: 10 mm
  • Number of Roof Vents: 2
  • Rain Gutters: Built-in
  • Steel Base Kit: Sold separately; included with the selectable Dirt configuration
  • Snow-Load Kit: Included
  • Optional Back-Door Kit: Yes
  • Anchor Options: Wood, Concrete, Dirt
  • Assembly Tools: Not included
  • Size Guide
  • Extension Dimensions: 12 ft. wide x 4 ft. long x 9 ft. 3 in. high
  • Additional Interior Growing Area: Approximately 32 sq. ft.

Compatibility

Compatible With: Grandio Summit greenhouse models.

Not Compatible With: Grandio Ascent, Elite, or Element greenhouse models.

  • Additional Length: Adds 4 ft. of length to an existing compatible greenhouse.
  • Additional Growing Area: Provides approximately 32 sq. ft. of additional interior growing area.
  • Integrated Construction: Designed to match the existing frame dimensions, glazing system, and structural profile.
  • Heavy-Duty Frame: Uses a 1.2 mm aluminum frame with 1.5 mm reinforced areas.
  • Polycarbonate Panels: Uses 10 mm polycarbonate panels.
  • Roof Ventilation: Includes 2 roof vents.
  • Rainwater Management: Built-in rain gutters are incorporated into the extension.
  • Snow-Load Support: A snow-load kit is included.
  • Anchor Configurations: Select Wood, Concrete, Dirt with Base Kit, or No Anchor or Base Kit according to the installation requirements.

Provides Additional 32sq ft Of Growing Space

Seamless Integration to Match Existing Greenhouse

Maintains Structural Integrity

Easy to Install

More Room to Grow

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