Octagonal

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Overview

The Octagonal cedar greenhouse combines striking geometry with enduring strength and timeless appeal. Crafted from Grade A knot-free Western Red Cedar, each piece is elevated on a protective aluminum frame and treated to resist aging, moisture, and rotting. Its high-pitched roof and expansive glass panels fill the space with light. Built-in ventilation ensures a comfortable growing environment year-round.

More than a greenhouse, the Octagonal becomes a destination within the garden. Whether used for growing, entertaining, or quiet retreat, it surrounds you with the natural beauty of cedar and the warmth of sunlight, reflecting Alton’s century of craftsmanship in every detail.

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Key Features

Mortice-Tenon and Tongue-Groove Framing Joints

Easy to assemble and adds strength

Aluminum Base

Wood never touches base to protect from water damage

Gutter and Downspout

For water collection or drainage

Roof Vents

Featuring automatic opener system

Louvre Window

Manual opening for airflow (automatic openers available)

Hinged Door

Pre-assembled Low threshold single with locking handle and key

Aluminum Capping

Seats the glass panels securely, low maintenance, high durability

High Eaves

More space equals more air and headroom, overlapping roof glass prevents leakage

Guarantee

Free 10 year framework guarantee on all models we carry

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Specifications

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

9x12

Suggested Retail: $19,250
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)

Accessories

Our stocked 9x12 Fully Loaded Model Includes:

3mm safety glass with screw-in aluminum capping
Hinged lockable double doors - wide opening
Victorian style aluminum guttering with downspout
Automatic opening roof vents (2)
Louvre windows (2)
Aluminum capping in Moss color
Octagonal upper shelf (2) sides
Octagonal staging shelf (2 sides and rear wall)

Gallery

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Frequently Asked Questions

Why choose cedar for a greenhouse?

Cedar wood offers natural rot resistance, pest resistance, and excellent insulation properties, helping create a stable internal climate for plants and reducing maintenance needs over time. Not only that, but cedar smells terrific, and the wood adds warmth and natural character to any outdoor space.

How do cedar greenhouses compare to other materials?

Cedar is a premium greenhouse frame material because it is naturally resistant to rot, decay, and insects. It is structurally strong and stable, yet lighter than many hardwoods. Unlike aluminum, cedar does not conduct heat or cold as quickly, which can slightly reduce temperature transfer through the frame. Over time, it weathers gracefully and maintains its structural integrity for decades when properly maintained. For buyers who want a durable, natural, and architecturally warm frame material, cedar is a premium choice.

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