Alton Cheltenham Cedar Greenhouse- Aluminum Base

Bring timeless craftsmanship to your garden with the Alton Cheltenham Cedar Half-Boarded Greenhouse. Built from Grade 1 Western Red Cedar and crafted with precision mortise-and-tenon joinery, this 8'8"-wide greenhouse offers unbeatable durability, aesthetic charm, and long-term performance.

Why Growers Love the Cheltenham Half-Boarded Greenhouse

• ✅ Premium Grade 1 Western Red Cedar (No Knots) – Naturally weather-resistant and pre-sealed for longevity

• ✅ Mortise & Tenon Craftsmanship – Classic joinery for a rigid, elegant structure

• ✅ Tempered Safety Glass Glazing – 3mm thick panels provide durability and clarity

• ✅ Aluminum Base Frame – Lifts wood from ground contact to prevent moisture damage

• ✅ Gutters + Downspouts Included – Built-in drainage to protect the structure and garden

• ✅ Decorative Ridge Cresting & Knee Braces – Elegant detailing meets functional support

Classic English-Style Greenhouse for High-End Gardens

With 5'7" high sidewalls, a 10' peak, and a steep 45° roof pitch, the Cheltenham Half-Boarded Greenhouse delivers both usable space and a striking silhouette. The solid lower panels offer insulation and privacy, while the upper toughened glass allows in full-spectrum light to promote healthy plant growth.

Built to Last with Premium Cedar and Stainless Hardware

Crafted from Canadian-sourced, Grade 1 Western Red Cedar, each board is dipped and sealed for maximum protection—free of knots and rich in natural oils. Stainless steel hardware, tongue-and-groove boarding, and aluminum capping provide superior resistance to weather, while a keyed-locking door and structural knee-bracing add both security and strength.

Ideal Applications

• Backyard gardeners and landscape designers seeking a luxury structure

• Year-round propagation or seasonal production

• Cold climate overwintering

• Botanical displays or specialty crop cultivation

• Clients focused on long-term aesthetics and durability

Maintenance Tips

• Reapply cedar sealant annually to maintain color and UV resistance

• Clean glass panels seasonally with non-abrasive cleaner to ensure light transmission

• Lubricate door hinges and automatic roof vent openers if applicable

• Check gutters and downspouts regularly to ensure proper drainage

• Expect natural color variations in cedar as part of its unique character

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

Ready to Elevate Your Garden with Architectural Elegance?

The Alton Cheltenham Half-Boarded Greenhouse isn’t just a growing space—it’s a centerpiece. From precision craftsmanship to premium materials, it's built to stand the test of time and climate.

Order today to lock in seasonal availability and free shipping.

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

16'8"

• Length: 16'8"
• Width: 8'8"
• Peak Height: 10'
• Sidewall Height: 5'7"
• Area: 144.9 sq. ft.
• Roof Pitch: 45 degrees
• Doors: 1 Lockable Door with Keys
• Windows: 4 Roof Vents w, 3 Louvre Window
• Window Openers: 4 Automatic (Roof), 3 Manual (Louvre)

18'

• Length: 18'
• Width: 8'8"
• Peak Height: 10'
• Sidewall Height: 5'7"
• Area: 163 sq. ft.
• Roof Pitch: 45 degrees
• Doors: 1 Lockable Door with Keys
• Windows: 5 Roof Vents w, 4 Louvre Window
• Window Openers: 5 Automatic (Roof), 4 Manual (Louvre)

20'

• Length: 20' 10"
• Width: 8'8"
• Peak Height: 10'
• Sidewall Height: 5'7"
• Area: 181 sq. ft.
• Roof Pitch: 45 degrees
• Doors: 1 Lockable Door with Keys
• Windows: 6 Roof Vents w, 4 Louvre Window
• Window Openers: 6 Automatic (Roof), 4 Manual (Louvre)

Kit Comes Standard With

• 3mm safety glass with screw in cedar capping
• Wide single door with lock and low threshhold
• Victorian style aluminum guttering with downspout
• Automatic opening roof vents
  16'8"(4)
  18'(5)
  20'(6)
• Louvre windows
  16'8"(3)
  18'(4)
  20'(4)

Can Also Add

• Aluminum bar capping
• 2 slat shelf staging
• 4 slat shelf staging
• Victorian cresting

Q: Can this greenhouse withstand snow and wind?
A: Yes, the steep 45° pitch, structural knee braces, and aluminum base make it well-suited for harsh weather.

Q: Are there options for extensions?
A: Yes, extended versions are available with additional trusses for support.

Q: What’s the difference between half-boarded and full-glass models?
A: Half-boarded designs offer more insulation and visual privacy, ideal for cold climates or storage.

Q: Is professional assembly recommended?
A: Two experienced DIYers can install it over a weekend, but professional installation ensures best results.

Q: Does the cedar change color over time?
A: Yes, expect a natural shift from reddish tones to silvery-grey unless re-sealed annually.

Q: Is everything included for drainage?
A: Yes, gutter systems with downspouts come standard for water management.

• 10-Year Manufacturer Warranty on Frame & Glass

• 5-Year Warranty on Aluminum Base and Hardware