6x20 Polycarbonate Greenhouse with Twin-Wall Insulated Panels

Large 6x20 Greenhouse with Premium Insulated Polycarbonate for All-Season Growing

6mm Twin-Wall Polycarbonate for Exceptional Thermal Control

This 6x20ft greenhouse is clad in 6mm premium-grade twin-wall polycarbonate — an ideal material for reducing heat loss in winter and excess heat gain in summer. Its insulating structure helps create a stable environment, especially beneficial for temperature-sensitive crops.

Sturdy, Rust-Free Frame with a Bespoke Architectural Finish

The modern matt-black aluminium frame is powder-coated to resist rust, corrosion, and UV exposure. Designed for strength over longer spans, it maintains a clean, architectural look with the durability needed for long-term outdoor use.

Manufactured in New Zealand. Warehoused and Supported in Australia.

Winter Gardenz greenhouses are made for Australasian conditions — designed in New Zealand and assembled here in Australia. You’ll get local support, fast delivery, and clear instructions — no international wait times or confusing manuals.

Expansive Space and Airflow for Committed Growers

At 1972mm wide x 6386mm long, this greenhouse offers extensive internal room for multi-zone setups, raised beds, or large-scale propagation. With 8 roof vents included, it delivers excellent airflow and improved climate control across the entire structure.

• Dimensions: 1972mm (W) x 6386mm (L) x 2360mm (H to ridge)
• Height to gutter: 1620mm
• Glazing: 6mm twin-wall polycarbonate
• Frame: Matt-black powder-coated aluminium
• Roof vents: 8 included for ventilation
• Wind Rating: Up to 150km/h when installed to specification

Optional Shade Cover Available
For additional temperature regulation and light control, a custom-fit shade cover is available to complement this model. Manufactured from durable, weather-resistant materials, the cover is easy to install and compatible with both automatic and manual vent systems.

For greenhouses longer than 12ft, we recommend purchasing two shade covers for full coverage. Custom sizing is also available—please contact us for a quote tailored to your needs.

Please note: Greenhouses can only be delivered to your nearest Mainfreight Depot.