Cambridge T-shaped Cedar Half-Boarded Greenhouse

• The Alton Cambridge is for someone who wants more than a standard greenhouse footprint. Its classic T-shaped orangerie design creates a true garden focal point—without sacrificing practicality. With a 10' peak and 5'7" sidewalls, the interior feels open, comfortable, and easy to work in.
• Built from Grade A, knot-free Western Red Cedar and set on an aluminum base frame that keeps the wood raised off the ground, the Cambridge is designed to stay solid over time. Add 3mm tempered safety glass, protective aluminum capping + rubber seals, and automatic roof vent openers (no electricity)—and you get a greenhouse that feels thoughtfully engineered, not fussy.
• Alton uses 100% Western Red Cedar, which is naturally rot-resistant and well-suited to greenhouse conditions. It's also designed to keep water away from the most vulnerable areas—thanks to features like the roof glass overhang, aluminum capping, guttering, and the raised metal base that keeps the cedar off damp ground.
• The Cambridge uses strong cedar framing bars with mortise-and-tenon and tongue-and-groove joints to help the frame stay rigid and aligned. When a greenhouse stays square, everything keeps working properly—doors close cleanly, vents operate smoothly, and glazing stays seated the way it should season after season. Because the joints interlock precisely, assembly tends to feel more straightforward and self-aligning as you build.
• Roof vents include automatic openers that respond to temperature changes—so heat can escape without electricity. Louver windows add lower airflow to support circulation and help manage humidity.
• A tall hinged door and low threshold make the Cambridge easy to use day to day—especially when your hands are full. The door swings inward, and it comes standard with a keyed lock. Because the door swings inward, you can still get inside even if snow has built up outside—no clearing the doorway first.
• Because this is real cedar, you'll see natural variation from piece to piece—lighter and darker tones are normal, and that's part of its charm. Outdoors, unfinished cedar will gradually weather to a soft silvery gray. If you prefer a more uniform look, you can stain or paint the wood.

• Western Red Cedar framing
• 3mm tempered glass
• Aluminum base frame
• Aluminum capping
• Lockable single hinged door
• Gutters + downspouts
• Victorian ridge cresting
• Staging shelves along back wall: 12" deep (2-slat) + 20" deep (4-slat)
• Hardware
• Roof vents with automatic openers (qty varies by size)
• Louver windows (qty varies by size)

Build and materials

• Frame: Western Red Cedar, half-boarded design
• Design: T-shaped layout, adds a strong focal point and creates a more elevated garden feature
• Foundation: integrated aluminum foundation frame, installed on a flat, level, stable base
• Anchoring: manufacturer-recommended hardware, matched to regional wind and snow load

Ventilation

• Roof vents: 4 automatic (17×10 and 12×10), 6 automatic (21×10)
• Louvered window: 4 manual included (17×10), 2 manual included (12×10), 4 manual included (21×10)
• Misting system: Not Included

Performance ratings

• Warranty: 15-year Janssens frame warranty

Assembly typically takes 2–3 days with a crew of 2–3 people — this isn't a same-afternoon build, largely due to the glass glazing work and the size of the larger models. Buyers should plan the timeline and labor accordingly, especially if they're coordinating with a foundation contractor beforehand.

Manual

Free shipping to all 48 contiguous states

Delivery time: 8–13 business days

Ships via LTL freight (curbside): liftgate drops the pallet at ground level; plan on 2–3 people to move it from the curb to your install site

Outside the mainland US (Alaska, Hawaii, international)? Shipping terms need to be confirmed separately

Warranty

Damages

Please inspect the packaging of your item(s) upon arrival. If you notice any damage, make note of it when signing for delivery. If your item(s) arrive damaged, please contact us with photos and we will process an insurance claim on your behalf.

Cancellations & Refunds

Orders cancelled after 48 hours are subject to a $20 administration fee, whether or not the order has shipped. If the order has already shipped, the buyer is also responsible for actual return shipping charges. Refunds are issued only to the original credit card used at the time of purchase.

Many of our items are large and heavy, and cannot be returned for buyer's remorse. In these cases, all sales are final.

Returns (RMA)

In certain situations, we will accept a return through our RMA department. The buyer is responsible for full return shipping costs. All returns must be pre-approved by our RMA department before being shipped back.