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Alton Octagonal Cedar Greenhouse- Aluminum Base

by Alton
$14,851.00

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(844) 873-5764

Description

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.

Alton Octagonal Cedar Greenhouse front view


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.

Alton Octagonal Cedar Greenhouse inside view #2 roof


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

  • 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)

Dimensions

Evolution Octagonal Cedar Greenhouse (11'10" x 9'2") Dimensions
  • A: Base Width 3611 mm (11ft10)
  • B: Length 2800 mm (9ft2)
  • C: Eaves Height 1989 mm (6ft6)
  • D: Ridge Height 2948 mm (9ft8)
  • E: Door Width 1460 mm (4ft9)
  • F: Door height 1810 mm (5ft11)

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

 

Why Buy From US

Who We Are

At Garden GrowShop, we're not a faceless online retailer. We're a small, family-run business with real roots in the growing community. Every product we carry has been carefully chosen to meet the needs of both home growers and commercial operators — because we’ve walked in your shoes.

Personal, Knowledgeable Support
When you reach out to us, you’re not getting a canned reply or being passed between departments. You're talking to someone who actually knows the products, understands your challenges, and is here to help you succeed.

Transparent Pricing — No Gimmicks
We believe in fair, honest pricing. No inflated markups, no bait-and-switch tactics. If you ever find a better price on the same item, let us know — we’ll match it without the hassle.

Fast, Dependable Shipping
We ship directly from warehouses across the U.S. to get your order to you quickly and reliably. No inflated delivery timelines, and no surprise shipping fees — just smooth, on-time delivery you can count on.

A Partnership, Not a Transaction
Our customers stick with us because we treat them like partners. Whether you're outfitting a small indoor setup or managing a large-scale operation, we’re here to grow with you — not just sell you equipment.

Our Commitment
If something goes wrong, we don’t pass the buck. We work with you directly to make it right. That’s how we’ve built our business, and that’s how we plan to keep it.

Shipping/ Returns

Shipping Policy

Free Shipping Within the Continental U.S.
We offer free shipping on all orders shipped to addresses within the continental United States. There are no hidden fees, minimum order requirements, or handling charges. The price you see at checkout is the final price you pay.

Order Processing
Orders are typically processed within 1–2 business days (Monday–Friday). If an item is temporarily backordered or delayed, we’ll notify you by email with an updated shipping estimate.

Shipping Confirmation & Tracking
Once your order has shipped, we’ll email you a shipping confirmation that includes tracking information. You can use this to monitor the delivery status of your package in real time.

Estimated Delivery Time
Most orders arrive within 3–7 business days of shipping, depending on your location and the item’s warehouse origin. Freight items and oversized packages may take additional time.

Shipping Carriers
We use trusted carriers such as FedEx, UPS, USPS, and professional freight delivery services for large or heavy items. Depending on the size of your order, it may arrive in multiple packages or from multiple warehouses.

Delivery and Moving Disclaimer
Please note: We do not offer moving or installation services. For freight shipments or large items, carriers are only responsible for curbside delivery. Drivers are not required to move items inside your home, up stairs, or to specific locations. We strongly recommend having assistance available at the time of delivery for heavy or bulky shipments.

Address Accuracy & Order Changes
Please ensure your shipping address is correct at the time of checkout. Once an order has shipped, we are unable to change the delivery address or reroute the shipment. If you need to make changes to your order, contact us immediately after placing it.

Damaged or Lost Shipments
If your order arrives damaged or appears to be lost in transit, contact us within 48 hours of delivery (or expected delivery). We will work with the carrier to resolve the issue as quickly as possible.

Shipping Restrictions
We currently ship only to addresses within the continental United States. We do not ship to Alaska, Hawaii, U.S. territories, or international destinations.

Questions?
If you have questions about your order, delivery, or shipping process, feel free to reach out to us through our Contact Us page or via email. We’re here to help.

Start of Returns section 

Easy Returns, No Surprises

At Garden GrowShop, we stand behind the quality of every product we carry. But we also understand that sometimes things just don’t work out — and that’s okay. If you change your mind or the item isn’t quite what you expected, we’ve got you covered.

30-Day Return Guarantee

You have 30 days from the date of delivery to request a return for any reason. To start a return, simply email us at sales@gardengrowshop.com with your order number and we’ll walk you through the process.

Here’s what to expect:

  • You’ll receive clear return instructions from our team.

  • Once your item is received and inspected, we’ll issue a refund to your original payment method.

  • Items must be returned in “like new” condition, with all original packaging and accessories.

  • Return shipping costs are the responsibility of the customer.

“Like new” means no visible wear, damage, or missing parts. Items showing signs of use or misuse may not qualify for a refund.


Damaged or Defective Orders

If your order arrives damaged or defective, don’t worry — we’ll take care of it.

Here’s what to do:

  • Note any damage with the delivery driver when signing for the package.

  • Email photos and a description of the issue to sales@gardengrowshop.com on the same day you receive it.

  • We’ll cover the cost of return shipping and make sure a replacement is sent out quickly.

Please keep all original packaging in case a return is needed. This helps speed up the process and ensures a smooth resolution.


Order Cancellations

If you need to cancel your order, please contact us as soon as possible at sales@gardengrowshop.com or by phone.

  • Cancellations before shipment receive a full refund.

  • Cancellations after shipment will follow our standard return policy and may be subject to return shipping costs.


Important Return Notes:

  • Certain products may have brand-specific return restrictions, which will be noted on the product page.

  • Products purchased for temporary or single-use purposes (e.g. trade shows, promotional events) are not eligible for return.


We’re Here to Help

Our goal is to make returns and exchanges as easy as possible — with no stress and no surprises. If you’re unsure whether your order qualifies or just want to ask a question, don’t hesitate to reach out. We’re here to make sure you feel confident before and after your purchase.

Why Garden GrowShop?

We’re an authorized dealer for every brand we sell—so you’ll always get full manufacturer warranties, premium support, and authentic gear direct from the source.

✅ Fast, tracked shipping on all orders
✅ 100% safe and secure checkout
✅ No restocking fees on returns
✅ Friendly U.S.-based support when you need it

Have questions? We're here to help. Whether you're just getting started or scaling up a full grow, our experts can guide you to the right gear.

Customer Reviews

Based on 5 reviews
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(5)
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M
Melissa C.
Compact but functional

We didn’t have room for a large greenhouse, so the Octagonal was perfect. There’s still plenty of space inside and it looks incredible from every angle.

J
James P.
Easy to assemble and worth the price

The instructions were clear and everything fit together well. Once built, it was clear this was a premium structure. Love the wood finish!

K
Karen M.
Beautiful centerpiece for our garden

The octagonal design is absolutely stunning. It doesn’t just grow plants—it elevates the entire look of our backyard. The cedar smells amazing, and it's built to last.

D
Diana H.
Great for year-round use

This greenhouse stays warm even in early spring, and it’s ventilated well enough for summer. A great investment.

T
Todd L.
Solid construction and great light

I love the way sunlight pours in from every angle. The build quality is outstanding and it handled our winter storms without any issues.

Description

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.

Alton Octagonal Cedar Greenhouse front view


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.

Alton Octagonal Cedar Greenhouse inside view #2 roof


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

  • 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)

Dimensions

Evolution Octagonal Cedar Greenhouse (11'10" x 9'2") Dimensions
  • A: Base Width 3611 mm (11ft10)
  • B: Length 2800 mm (9ft2)
  • C: Eaves Height 1989 mm (6ft6)
  • D: Ridge Height 2948 mm (9ft8)
  • E: Door Width 1460 mm (4ft9)
  • F: Door height 1810 mm (5ft11)

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

 

Why Buy From US

Who We Are

At Garden GrowShop, we're not a faceless online retailer. We're a small, family-run business with real roots in the growing community. Every product we carry has been carefully chosen to meet the needs of both home growers and commercial operators — because we’ve walked in your shoes.

Personal, Knowledgeable Support
When you reach out to us, you’re not getting a canned reply or being passed between departments. You're talking to someone who actually knows the products, understands your challenges, and is here to help you succeed.

Transparent Pricing — No Gimmicks
We believe in fair, honest pricing. No inflated markups, no bait-and-switch tactics. If you ever find a better price on the same item, let us know — we’ll match it without the hassle.

Fast, Dependable Shipping
We ship directly from warehouses across the U.S. to get your order to you quickly and reliably. No inflated delivery timelines, and no surprise shipping fees — just smooth, on-time delivery you can count on.

A Partnership, Not a Transaction
Our customers stick with us because we treat them like partners. Whether you're outfitting a small indoor setup or managing a large-scale operation, we’re here to grow with you — not just sell you equipment.

Our Commitment
If something goes wrong, we don’t pass the buck. We work with you directly to make it right. That’s how we’ve built our business, and that’s how we plan to keep it.

Shipping/ Returns

Shipping Policy

Free Shipping Within the Continental U.S.
We offer free shipping on all orders shipped to addresses within the continental United States. There are no hidden fees, minimum order requirements, or handling charges. The price you see at checkout is the final price you pay.

Order Processing
Orders are typically processed within 1–2 business days (Monday–Friday). If an item is temporarily backordered or delayed, we’ll notify you by email with an updated shipping estimate.

Shipping Confirmation & Tracking
Once your order has shipped, we’ll email you a shipping confirmation that includes tracking information. You can use this to monitor the delivery status of your package in real time.

Estimated Delivery Time
Most orders arrive within 3–7 business days of shipping, depending on your location and the item’s warehouse origin. Freight items and oversized packages may take additional time.

Shipping Carriers
We use trusted carriers such as FedEx, UPS, USPS, and professional freight delivery services for large or heavy items. Depending on the size of your order, it may arrive in multiple packages or from multiple warehouses.

Delivery and Moving Disclaimer
Please note: We do not offer moving or installation services. For freight shipments or large items, carriers are only responsible for curbside delivery. Drivers are not required to move items inside your home, up stairs, or to specific locations. We strongly recommend having assistance available at the time of delivery for heavy or bulky shipments.

Address Accuracy & Order Changes
Please ensure your shipping address is correct at the time of checkout. Once an order has shipped, we are unable to change the delivery address or reroute the shipment. If you need to make changes to your order, contact us immediately after placing it.

Damaged or Lost Shipments
If your order arrives damaged or appears to be lost in transit, contact us within 48 hours of delivery (or expected delivery). We will work with the carrier to resolve the issue as quickly as possible.

Shipping Restrictions
We currently ship only to addresses within the continental United States. We do not ship to Alaska, Hawaii, U.S. territories, or international destinations.

Questions?
If you have questions about your order, delivery, or shipping process, feel free to reach out to us through our Contact Us page or via email. We’re here to help.

Start of Returns section 

Easy Returns, No Surprises

At Garden GrowShop, we stand behind the quality of every product we carry. But we also understand that sometimes things just don’t work out — and that’s okay. If you change your mind or the item isn’t quite what you expected, we’ve got you covered.

30-Day Return Guarantee

You have 30 days from the date of delivery to request a return for any reason. To start a return, simply email us at sales@gardengrowshop.com with your order number and we’ll walk you through the process.

Here’s what to expect:

  • You’ll receive clear return instructions from our team.

  • Once your item is received and inspected, we’ll issue a refund to your original payment method.

  • Items must be returned in “like new” condition, with all original packaging and accessories.

  • Return shipping costs are the responsibility of the customer.

“Like new” means no visible wear, damage, or missing parts. Items showing signs of use or misuse may not qualify for a refund.


Damaged or Defective Orders

If your order arrives damaged or defective, don’t worry — we’ll take care of it.

Here’s what to do:

  • Note any damage with the delivery driver when signing for the package.

  • Email photos and a description of the issue to sales@gardengrowshop.com on the same day you receive it.

  • We’ll cover the cost of return shipping and make sure a replacement is sent out quickly.

Please keep all original packaging in case a return is needed. This helps speed up the process and ensures a smooth resolution.


Order Cancellations

If you need to cancel your order, please contact us as soon as possible at sales@gardengrowshop.com or by phone.

  • Cancellations before shipment receive a full refund.

  • Cancellations after shipment will follow our standard return policy and may be subject to return shipping costs.


Important Return Notes:

  • Certain products may have brand-specific return restrictions, which will be noted on the product page.

  • Products purchased for temporary or single-use purposes (e.g. trade shows, promotional events) are not eligible for return.


We’re Here to Help

Our goal is to make returns and exchanges as easy as possible — with no stress and no surprises. If you’re unsure whether your order qualifies or just want to ask a question, don’t hesitate to reach out. We’re here to make sure you feel confident before and after your purchase.

Why Garden GrowShop?

We’re an authorized dealer for every brand we sell—so you’ll always get full manufacturer warranties, premium support, and authentic gear direct from the source.

✅ Fast, tracked shipping on all orders
✅ 100% safe and secure checkout
✅ No restocking fees on returns
✅ Friendly U.S.-based support when you need it

Have questions? We're here to help. Whether you're just getting started or scaling up a full grow, our experts can guide you to the right gear.