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Riverstone Industries Monticello 4 ft. Greenhouse Extension Kit

Item#: HN-RVCO011
Riverstone Industries Monticello 4 ft. Greenhouse Extension Kit Alternate Image 2
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List Price: $839.99
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Product Info
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  • 4-ft. extension for Monticello series greenhouses
  • Heavy-duty aluminum frame for lasting quality
  • High-impact, UV-stable 8mm twin-wall polycarbonate panels
  • Integrated dual gutter system and flush-base design
  • 2 x 2-ft. roof vent with automatic opener
  • Unpainted frame or electrostatically painted black
  • Overall dimensions: 4.1L x 8.1W x 7.6H feet

What's Included

4-ft. greenhouse section, Gutter system, Integrated base, Vent

What's Not Included



When you're ready to become a gardening pro from a mere hobbyist, the Riverstone Industries Monticello 4 ft. Greenhouse Extension Kit will help you make the jump. Made to match up perfectly with the Monticello series greenhouses, this extension kit uses the same high-quality, commercial-grade materials and construction and can easily be built and installed in less than two hours. This kit also comes with the same auto-open vent and integrated base and gutters that are part of the series. Get ready to turn pro because the bigger you go, the more you can grow.

Additional features:

  • High-impact, UV stable 8 mm twin polycarbonate walls and roof
  • Heavy-duty extruded aluminum frame
  • Easy, fast assembly even for inexperienced builders
  • Peak height: 90 inches
  • Sidewall height: 58 inches
  • Snow load capacity: 24lbs./sq. ft.
  • Wind load capacity: 52m/sec. (113 mph gusts)
  • Proudly made in the United States

About Riverstone Industries
Riverstone Industries prides itself on producing high-quality environmentally and economically conscientious products for the masses. They believe that their green product lines will enable everyone to help forge a brighter future for themselves and their world. By creating merchandise that is easy to assemble, backed by confident warranties, and supported by top-notch customer service, they have built and maintained outstanding quality that has resulted in customer satisfaction. Over the years, Riverstone Industries has also made a conscious effort to move its design and manufacturing programs to the United States, helping secure domestic jobs and a stronger economic environment.

Dimensions & Specifications


Riverstone Industries


4.1L x 8.1W x 7.6H ft.

Frame Material



8 mm Polycarbonate Twin Wall

Peak Height

90 in.

Sidewall Height

58 in.

Square Feet

123.125, 91.875


Color: Aluminum, Black

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