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Riverstone Industries  |  SKU: MONT-4-BK
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Riverstone Monticello 8 ft × 4 ft Black Greenhouse Extension Kit with 8 mm Twin-Wall Polycarbonate Panels

$1,099.99 USD

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Description

Riverstone Monticello 8 ft × 4 ft Black Greenhouse Extension Kit with 8 mm Twin-Wall Polycarbonate Panels

The Riverstone Monticello 8 ft × 4 ft Black Greenhouse Extension Kit is the perfect solution for gardeners ready to grow their indoor gardening space without replacing their entire structure. Designed to work with the Monticello series of greenhouses by Riverstone Industries, this extension adds valuable growing area while maintaining the original greenhouse’s aesthetic and performance. Its black electrostatically painted extruded aluminum frame and 8 mm twin-wall polycarbonate panels deliver long-lasting durability paired with excellent light diffusion and climate control.

Built with quality materials and thoughtful engineering, this extension features an integrated flush base design and heavy-duty framework that stands up to wind and weather. The included 2 ft × 2 ft roof vent with automatic opener and dual rainwater gutter system help maintain optimal airflow and moisture management for your plants. Assembly is straightforward with clear instructions and all necessary hardware included.

Riverstone’s greenhouse systems are proudly made in the USA and backed by a 10-year limited warranty, offering peace of mind and dependable performance season after season. Whether you’re expanding to accommodate more seedlings, seasonal crops, or specialty plants, this extension kit keeps your growing environment consistent and reliable.

Features

  • 8 mm Twin-Wall Polycarbonate Panels – High-impact, UV-stable construction provides superior insulation and light diffusion for healthy plant growth.

  • Heavy-Duty Extruded Aluminum Frame – Black electrostatically painted for long-lasting weather resistance.

  • Automatic Roof Vent with Opener – Supports proper airflow and temperature regulation.

  • Integrated Dual Rainwater Gutter System – Helps manage water runoff efficiently.

  • Included Hardware – All panels, framework, screws, and tools needed for assembly are provided.

  • 10-Year Limited Warranty – Strong industry warranty on frame and panels.

  • Proudly Made in the USA – Designed and manufactured for quality and performance.

Specifications

Specification Detail
Overall Dimensions Approx. 8.1 ft W × 4.1 ft L × 7.6 ft H
Panel Material 8 mm twin-wall polycarbonate
Frame Material Heavy-duty extruded aluminum with black electrostatic paint
Roof Vent 2 ft × 2 ft automatic roof vent included
Gutter System Integrated dual rainwater gutters
Warranty 10-year limited warranty
Assembly Required Yes – hardware and manual included
Country of Origin USA

What's Included

  • All Aluminum framework
  • all PC panels
  • hardware
  • instruction manual
  • screwdriver and wrench

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