Alton Westminster Cedar Greenhouse- Aluminum Base
Bring timeless craftsmanship and year-round performance to your backyard with the Alton Westminster Cedar Greenhouse. Designed with over a century of UK greenhouse expertise, this structure blends architectural beauty with reliable function. Whether you're cultivating vegetables, nurturing exotic plants, or simply seeking a serene garden retreat, the Westminster delivers unmatched durability, ventilation, and style.
Built from knot-free Western Red Cedar and elevated on a rust-resistant aluminum base, it protects your investment while aging gracefully. With automatic ventilation and precision joinery, this greenhouse is as functional as it is beautiful.
Key Benefits
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Built from Grade 1 Western Red Cedar for unmatched strength and longevity
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Aluminum foundation base prevents water damage and extends life
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Mortise-tenon and tongue-groove joints provide rock-solid stability
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3 mm tempered safety glass withstands harsh weather conditions
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Automatic roof vents and manual louvered windows for consistent airflow
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Pre-assembled door and window components simplify installation
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Elegant cedar aroma and rich wood tone enhance your garden's ambiance
Why the Alton Westminster is the Best Cedar Greenhouse for Serious Gardeners
With its classic greenhouse design, robust materials, and smart airflow management, the Alton Westminster is built to thrive through every season. The steep 45º roof sheds snow effortlessly, while large glass panes bring in abundant light. The aluminum base lifts the cedar frame off the ground to protect against moisture, a key advantage over traditional all-wood designs.
Ideal Applications
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Residential backyard gardening
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Orchid and exotic plant cultivation
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Seed starting and propagation
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Year-round vegetable growing
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Educational gardening environments
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Garden retreat or conservatory-style relaxation space
What Makes This Aluminum-Based Cedar Greenhouse So Durable?
Unlike most wood greenhouses, the Alton Westminster is supported by a full aluminum foundation. This not only keeps ground moisture away from the cedar framing, but also adds critical stability in all weather. Combined with cast aluminum gussets at every joint and weather-sealing aluminum bar capping, the result is a greenhouse that resists warping, rotting, and decay far longer than standard models.
Customize Your Greenhouse with Accessories
Select from a range of sizes that fit your space and gardening requirements. You can also improve your Westminster Greenhouse with staging shelves (offered in 2-slat or 4-slat designs) to keep your plants and tools organized. For a classic touch, consider adding solid cast aluminum cresting for a timeless appearance.
Please Note: Effective 05/01/2025 All Westminster 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.
Maintenance Tips
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Apply UV-protective cedar oil annually to maintain appearance and resistance
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Keep glass panels clean to optimize sunlight penetration
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Check and lubricate door hardware yearly for smooth operation
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Ensure roof vents and manual window openers are functioning each season
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Periodically inspect aluminum base for debris buildup and clean accordingly
Start Growing in Style with the Alton Westminster Greenhouse
Enhance your garden with a greenhouse that’s as beautiful as it is dependable. The Alton Westminster offers elite craftsmanship, weather-resistant construction, and timeless design—perfect for serious gardeners and architectural enthusiasts alike. Make your backyard a year-round growing haven today.
Specifications
Glazing: Toughened safety glass with screw in bar clamping (capping)
Frame: Extra strong cedar
10x16
- Length: 16'8"
- Width: 10'9"
- Peak Height: 11'1"
- Sidewall Height: 5'7"
- Area: 179 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)
10x18
- Length: 18'
- Width: 10'9"
- Peak Height: 11'1"
- Sidewall Height: 5'7"
- Area: 202 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)
10x20
- Length: 20'10"
- Width: 10'9"
- Peak Height: 11'1"
- Sidewall Height: 5'7"
- Area: 224 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)
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
10x16(4)
10x18(5)
19x20(6) - Louvre windows
10x16(3)
10x18(4)
19x20(4)
Can Also Add
- Aluminum bar capping
- 2 slat shelf staging
- 4 slat shelf staging
- Victorian cresting
User Manual
FAQ
1. How long does delivery take?
Delivery typically takes 4–6 weeks depending on your region and customization options.
2. Can I install this greenhouse myself?
Yes, but due to the size and precision of the framing, professional installation is recommended.
3. What are the ventilation features?
The greenhouse includes roof vents with automatic openers and manual louvered side windows to ensure continuous airflow.
4. What accessories are available?
Optional 2-slat and 4-slat staging shelves and cast aluminum cresting can be added for customization.
5. How is the cedar treated for weather resistance?
Each piece is treated with a preservative that minimizes water absorption and UV aging.
6. Can this greenhouse handle snow loads?
Yes, the steep 45º roof pitch is specifically designed to allow snow to slide off easily.
7. Is the aluminum base necessary?
Absolutely—it elevates the cedar framing above ground level to protect against water damage and prolong structural integrity.
Videos
Warranty
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10-Year Manufacturer's Warranty on structural components, including aluminum base and cedar frame integrity.