Alton Octagonal Cedar Greenhouse- Aluminum Base

A high-end, handcrafted octagonal greenhouse made from premium Western Red Cedar with a protective aluminum base—designed to elevate your garden space with beauty and practicality.

The Alton Octagonal Cedar Greenhouse with Aluminum Base is more than just a structure—it's a centerpiece. Crafted in the UK from Grade 1 Western Red Cedar and elevated on a powder-coated aluminum foundation, this octagonal design provides superior ventilation, weather resistance, and style. With high-eaves architecture, large-pane tempered glass, and modernized staging and gutters, it’s a top-tier choice for growers seeking performance with elegance.

Key Benefits

• Octagonal Design with 360° Sunlight – Unique 8-sided shape maximizes light exposure and creates a garden focal point

• Premium Cedar Construction – Grade 1 Western Red Cedar resists rot, water absorption, and aging while preserving its natural color

• Aluminum Base Foundation – Elevates wood framing 2 inches off the ground to protect from water damage and prolong lifespan

• Ventilation That Works Automatically – Two automatic roof vents and side louvre vents regulate airflow based on temperature

• Durable 3mm Tempered Glass – Full-length safety glazing secured with aluminum screw-in capping

• Wide Double Doors with Low Threshold – Easy access for carts, tools, and people—includes secure locking system

• Modern Moss Green Powder-Coated Gutters & Staging – Upgraded aluminum components for a sleek, functional look

• Handcrafted in the UK – Built by Alton’s expert team with attention to every detail

Garden Centerpiece Greenhouse with High-Eaves and Integrated Ventilation

Designed with both form and function in mind, the high-eaves structure ensures you have ample vertical space for plant growth and comfort. The automatic roof vents open and close with changing temperatures, while the side louvre vents create cross ventilation—maintaining an optimal climate without the need for manual adjustments.

Ideal Applications

• Residential garden focal point

• Seasonal vegetable or flower cultivation

• Greenhouse retreat or potting workspace

• Conservatory-style outdoor extension

• All-weather plant growing

Durable Cedar Greenhouse with Aluminum Base and Moss Green Finishes

This upgraded model includes a corrosion-resistant aluminum base that prevents ground contact and moisture damage. New aluminum staging and guttering—powder-coated in a soft Moss Green—replace older timber and PVC components, giving the greenhouse a modern edge with low-maintenance durability.

Make your greenhouse unique 

The Alton Octagonal Greenhouse offers multiple customization options. Add 2 side shelving, 3 side shelving or an additional upper shelving. You can also fortify your greenhouse with the Aluminum capping!

Please Note: Effective 05/01/2025 All Octagonal Greenhouse will be stocked as "fully loaded"; this includes Aluminum Capping and slatted shelving. You can still purchase a not fully loaded kit, but it will be a special order and could lead to a longer ship time. 

Maintenance Tips

• Reapply cedar oil or UV sealant annually to preserve color and longevity

• Clean gutters and vents regularly to prevent clogs and ensure airflow

• Inspect aluminum capping and joints for tightness seasonally

• Remove snow accumulation during heavy storms from the steep-pitched roof

• Keep the foundation area clear of standing water or soil build-up

Bring Elegance and Performance to Your Garden with the Alton Octagonal Greenhouse

If you’re seeking a statement piece that also delivers serious horticultural function, this octagonal cedar greenhouse offers the perfect balance. Built to last, designed to impress—order yours today and upgrade your outdoor growing environment.

Specifications

Glazing: Toughened safety glass with screw-in bar clamping (capping)
Frame: Extra strong cedar

9x12

• Suggested Retail: $12,999
• Length: 11'10'"
• Width: 9'2"
• Peak Height: 9'8"
• Area: 101 sq. ft.
• Doors: Hinged Double Doors
• Windows: 2 Roof Vents, 2 Louvre Window
• Window Openers: 2 Automatic (Roof), 2 Manual (Louvre)

User Manual

FAQ

1. Does the aluminum base come standard?
   Yes, the powder-coated aluminum base is included with every model and lifts the frame 2" above ground level.

2. How is the ventilation controlled?
   Two roof vents open automatically with temperature changes, and two louvered side vents can be adjusted manually.

3. What type of glass is used?
   The greenhouse features 3mm toughened safety glass for increased durability and better insulation.

4. Can I install this greenhouse myself?
   Yes. It comes with pre-assembled doors and windows and detailed instructions. Two-person assembly recommended.

5. What are the staging and gutters made from?
   Both are made from powder-coated aluminum in Moss Green, offering a sleek, modern look and improved durability.

6. Is the cedar treated?
   The cedar is naturally rot-resistant. To maintain its color, a clear UV sealant is recommended annually.

7. What warranty is included?
   A 10-year structural warranty covers the frame and aluminum components.

Videos

Warranty

10-Year Limited Warranty on Frame and Aluminum Base Components