Alton Durham Orangerie
Price range: $28,600.00 through $39,600.00
Features
- T-shaped Orangerie with half-boarded panels for a classic beautiful look
- Compact footprint for buyers who want this distinctive shape in a more space-friendly size
- Grade A, knot-free Western Red Cedar for natural insulation and long-term durability
- Cedar tones naturally vary piece to piece and will weather to a graceful silvery gray over time
- Precision joinery keeps the structure rigid and square over time
- Aluminum base frame lifts cedar off the ground to help reduce early rot risk
- 3mm tempered safety glass for a bright growing environment
- Aluminum capping + rubber seals help keep panels tight and protected from weather
What's Included
- Cedar frame + glass panels + hardware
- Aluminum base frame & capping
- Roof vents with automatic openers (qty varies by size)
- Louver windows (qty varies by size)
- Lockable hinged door
- Shelves: 12" deep (2-slat) + 20" deep (4-slat) for the backwall
- Victorian ridge cresting
- Gutters + downpipe
Dimensions
Available in 3 sizes:
- 12' × 7': 12’5″ W x 7’5″ D x 8’10″ H
- 17' × 7': 16’8″ W x 7’5″ D x 8’10″ H
- 21' × 7': 20’10” W x 7’5″ D x 8’10″ H
Shipping
- Ships via LTL freight (curbside): Liftgate + pallet jack delivery; plan 2–3 people to move boxes off the pallet and into place.
- Lead time: 5–7 business days (in stock). Up to 12 weeks (if not in stock).
Assembly & Warranty
- Average assembly time: approx. 2-3 days with 2-3 people
- Assembly Manual: Download here
- 10-year warranty on the cedar framing
Secure Checkout
Nationwide Delivery
Veteran-Owned
Real Greenhouse Owners
Personalized Planning Help
Description
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The Alton Durham Orangerie is for someone who loves the look of a cedar orangerie but wants it in a footprint that feels easier to place. Its classic T-shaped design creates that distinctive garden focal point Alton is known for, while the more compact size makes it a natural fit for buyers who want beauty and presence without stepping up to a larger structure.
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.
Natural cedar character
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.
Low-maintenance cedar design
Alton uses 100% Western Red Cedar, which is naturally rot-resistant and well-suited to greenhouse conditions.
It is 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.
A timber frame that stays square (and goes together cleanly)
The Durham 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.
And because the joints interlock precisely, assembly tends to feel more straightforward and “self-aligning” as you build.
Tempered Glass With Extra Weather Protection
The Durham is glazed with 3mm tempered safety glass for a bright, premium growing environment.
Aluminum capping adds protection at key glazing points, while rubber seals help keep panels snug, improve weather resistance, and reduce rattling.
Ventilation that works without power
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.
Comfortable Access & Secure Close
A tall hinged door and low threshold make the Durham 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.
Gallery
Quick Size Guide
Peak height: 8’10″
Sidewall height: 5’7″
Depth (front door to back wall): 7’5″
Roof pitch: 45°
| Size | Actual Dimensions |
|---|---|
| 12′ x 7′ | 12’5″ L × 7’5″ D |
| 17′ x 7′ | 16’8″ L × 7’5″ D |
| 21′ x 7′ | 20’10” L × 7’5″ D |
Every Alton Durham Greenhouse kit includes:
- 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
| Vent Type | Dimensions | 12′ x 7′ | 17′ x 7′ | 21′ x 7′ |
|---|---|---|---|---|
| Roof Vent + Auto Opener | 23″ x 23″ | 2 | 4 | 6 |
| Louver Vent + Manual Opener | 31″ x 41″ | 2 | 4 | 4 |
Specifications
| Brand | Alton |
|---|---|
| Distributed by | Exaco |
| Made in | UK |
| Width | 12', 17', 21' |
| Length | 7' |
| Floorspace | 88 sq ft, 113 sq ft, 181 sq ft |
| Peak Height | 8'10" |
| Side Wall Height | 5'7" |
| Framing Material | Western Red Cedar |
| Frame Color | Moss Green, Natural Wood |
| Roof Glazing | 3mm tempered glass |
| Wall Glazing | 3mm Tempered Glass |
| Roof Pitch | 45° |
| Roof Vent Opener Type | Automatic (wax) |
| Roof Vent Dimensions | 23" x 23" |
| Door Type | Hinged, Single |
| Door Dimensions | 28″ x 79″ |
| Foundation Frame | Integrated Base |
| R-Value | 0.95, 1.35 |
| Rainwater Collection | Gutter with downspouts on both sides |
| Stem Wall Compatibility | No |
| Expandable | No |
| Warranty | 10 years on frame |
What foundation do I need?
Picking a level site is the best first step. It is important that the foundation is level and strong enough to hold the greenhouse. A concrete slab or a concrete perimeter wall will provide the most solid, long-lasting base. The key is that your foundation is level, square, and well-draining—even small twists can affect door operation and panel fit.
Helpful guides:
Does cedar color vary?
Yes — and that’s normal. Cedar is a natural material, so boards will vary in tone (light honey to deeper reddish shades) and grain pattern. Over time, cedar also weather-shifts if left unfinished.
Do I need to paint or treat it?
No. All Alton greenhouses are made from naturally rot-resistant Western Red Cedar and come factory-treated with a clear preservative. You don’t need to stain or re-treat it for rot protection—most owners just do a yearly clean. If you want a specific color or want to slow the natural silvery aging, you can apply a stain/preservative (easiest before assembly).
Do the roof vent openers require electricity?
No. They are wax-cylinder openers, which expand and contract with temperature to open/close the vent—so there’s no wiring and no power required.
Are There any accessories I should add?
The Durham already includes shelving for the back wall. Beyond that, we always recommend adding an exhaust fan because greenhouses can heat up very quickly in direct sunlight—even on mild days. If you plan to use the greenhouse in winter, you may need a heater as well.
Where does this ship from?
Austin, Texas
How Does Curbside Delivery Work?
Freight delivery drops your crate at the curb/end of driveway. Typically, you’ll unload the contents with the driver and the crate remains on the truck. If you have a forklift or tractor with long forks, you may be able to lower the whole crate using the liftgate. Plan for 2–3 people to help.
Tip: Make sure the truck can access your driveway and you have a clear staging area ready.
Made by
Alton: 100+ years of craftsmanship
Alton Cedar Greenhouses has built traditional timber greenhouses in the UK since 1921, known for classic design, careful joinery, and cedar construction that’s made to last.
Explore Alton GreenhousesDistributed by
Exaco
Exaco is the authorized North American distributor for Alton, known for importing a curated lineup of high-quality European garden products—and for support that goes the extra mile.
More About ExacoAdditional information
| Dimensions | N/A |
|---|---|
| Width | 12', 17', 21' |
| Length | 7' |
| Floorspace | 88 sq ft, 113 sq ft, 181 sq ft |
| Expandable | No |
| Side Wall Height | 5'7" |
| Peak Height | 8'10" |
| Roof Pitch | 45° |
| Framing Material | Western Red Cedar |
| Frame Color | Moss Green, Natural Wood |
| Roof Glazing | 3mm tempered glass |
| Wall Glazing | 3mm Tempered Glass |
| R-Value | 0.95, 1.35 |
| Door Type | Hinged, Single |
| Door Dimensions | 28″ x 79″ |
| Roof Vent Dimensions | 23" x 23" |
| Roof Vent Opener Type | Automatic (wax) |
| Foundation Frame | Integrated Base |
| Rainwater Collection | Gutter with downspouts on both sides |
| Stem Wall Compatibility | No |
| Made in | UK |
| Distributed by | Exaco |
| Warranty | 10 years on frame |
| Style | Orangerie |
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