Riga XL Greenhouse
Price range: $8,452.50 through $22,999.00
Features
- Built for harsh weather: Gothic-arch profile helps shed snow and handle wind
- Serious insulation upgrade: 16mm triple-wall polycarbonate helps smooth temperature swings (R-value 3.0)
- More room to grow: Larger footprint + taller peak for bigger crops, more benches, and easier movement
- Tight-fit build (quiet + secure): Snug fit + heavy-duty seals help prevent rattling and drafts.
- Two Dutch doors: Flexible access and strong cross-breeze without inviting critters
- Roof vent(s) with automatic opener for hands-free venting as temps rise.
- German-made aluminum frame: Designed for long-term stability and daily use.
What's Included
- Frame + glazing + hardware
- Roof vents with auto openers(qty varies by size)
- 2x Lockable Dutch doors (+ keys)
Dimensions
Available in 3 sizes:
- XL5: 14′ W x 16′5″ L x 9'10" H
- XL6: 14′ W x 19′1″ L x 9'10" H
- XL9: 14′ W x 29′6″ L x 9'10" 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 (it’s better to have 4 people for final assembly day)
- Assembly Manual: Download here
- Structural Certification: Download here
- Warranty: 10 years on polycarbonate (prorated after 5 years), 15 years on frame
Secure Checkout
Nationwide Delivery
Veteran-Owned
Real Greenhouse Owners
Personalized Planning Help
Description
Jump To:
The Riga XL is the “go bigger and go warmer” version of the Riga line. It’s built for gardeners who want more interior space and a noticeable insulation jump—thanks to 16mm triple-wall polycarbonate.
If you’re planning for winter growing, larger plant loads, more shelving, or simply a greenhouse that feels more stable and comfortable to work inside, the Riga XL is the step-up model.
Made For Harsh Weather
The Riga XL keeps the rugged gothic-arch profile that performs well in real weather. It’s designed to handle heavy conditions with confidence, including higher wind events and snow loads.
The Insulation Upgrade That Changes Everything
The defining difference of the Riga XL is its 16mm triple-wall polycarbonate. That extra thickness helps the greenhouse hold steadier temperatures—especially when the sun dips, clouds roll in, or the season turns cool.
This is the kind of upgrade you feel in day-to-day use: less “rapid swing,” more stable growing environment.
Bigger Footprint. Taller Peak. Easier Growing.
Space isn’t just about square footage—it’s how the greenhouse functions. The Riga XL gives you room for larger beds or longer bench runs, better walkways, and more flexibility for storage, potting, and staging plants.
Solid, Quiet, Less Drafty
A tight-fitting greenhouse doesn’t just “look nicer”—it stays nicer. Riga XL’s build approach keeps panels seated securely with a snug fit and sealing system that helps reduce rattling and drafts.
This is also a big part of why the structure feels sturdy over time—especially in wind.
Two Dutch Doors = Airflow + Access
The Riga XL comes with two wide Dutch doors, which is a huge usability win. You can create a strong cross-breeze without fully opening the greenhouse to pests, and you can choose the best entry point depending on your layout.
It’s the “daily driver” feature you end up using constantly—venting, moving trays, hauling soil, or just stepping in and out without walking the full length of the greenhouse.
Automatic roof venting adds extra heat release on sunny days—which is invaluable for greenhouses in any climate. Heat rises, so cracking the roof is one of the fastest ways to dump built-up warmth without needing to leave doors wide open.
If You Want Even More Height
If you’re planning tall crops, trellising, or want extra headroom, the Riga XL is stem wall compatible. It’s an easy way to add height and presence without changing the footprint or the core structure.
Add-Ons & Upgrades: Make it your own
Shelving
Add a full-length seed tray shelf, narrow top shelf, or slatted shelving to keep tools and plants organized—and create an easy workspace without eating up floor space.
Drop Door Kit (for stem wall installs)
Made for raised installs so your entry stays clean and comfortable—ideal when you’re building up on a stem wall (up to ~20″)
Foundation Frame
If you want an easy way to anchor the Riga XL Greenhouse without a concrete or wood foundation, add this foundation frame. All you need is digging a trench that this frame sits in.
Gallery
Quick Size Guide
Peak height: 9’10”
Sidewall height:
Width: 14’
Roof pitch: °
| Size | Actual Dimensions |
|---|---|
| XL5 | 14′ W × 16’5″ L x 9’10” H |
| XL6 | 14′ W × 19’1″ L x 9’10” H |
| XL9 | 14′ W × 29’6″ L x 9’10” H |
Every Riga XL Greenhouse kit includes:
- Aluminum framing + Glazing
- 2x Dutch doors
- Rubber seals
- Hardware
- Assembly instructions
| Vent Type | Dimensions | 5 | 6 | 9 |
|---|---|---|---|---|
| Roof Vent + Auto Opener | 38″ x 40″ | 4 | 4 | 8 |
Specifications
| Brand | Hoklartherm/KGT |
|---|---|
| Distributed by | Exaco |
| Made in | Germany |
| Width | 14' |
| Length | 17', 19', 23', 26', 30' |
| Floorspace | 231 sq ft, 280 sq ft, 322 sq ft, 368 sq ft, 413 sq ft |
| Peak Height | 9'10" |
| Framing Material | Aluminum |
| Frame Color | Aluminum |
| Roof Glazing | 16mm triple-wall polycarbonate |
| Wall Glazing | 16mm triple-wall polycarbonate |
| Roof Vent Opener Type | Automatic (wax) |
| Roof Vent Dimensions | 38" x 40" |
| Door Type | Dutch |
| Door Dimensions | 38" x 74" |
| Foundation Frame | Available Separately |
| R-Value | 3.0 |
| Wind Rating | 120 mph |
| Snow Tolerance | 30 psf (ground-snow load) |
| Rainwater Collection | No |
| Stem Wall Compatibility | Yes |
| Expandable | No |
| Warranty | 10 years (prorated after 5 years) on polycarbonate, 15 years on frame |
What foundation do I need?
Your foundation needs to be level, square, and well-draining—that matters more than the material. A treated wood beam base (anchored) or the optional foundation frame works well for many installs. For maximum stability, go with concrete blocks/pavers or a poured concrete perimeter/slab.
Helpful guides:
Is This a Heavy-Snow Greenhouse?
Yes—Riga XL is designed for winter weather. The gothic-arch roof helps snow shed off the sides more naturally, which means less buildup and less maintenance during snow season. For areas with very heavy snowfall or stricter local requirements, you can also add reinforcement options (like cross braces/center supports) to increase structural strength and peace of mind.
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?
If it fits your layout, full-length shelving is the most useful add-on for everyday growing and organization. Beyond that, we usually recommend an exhaust fan, since greenhouses can heat up fast in direct sun—even on mild days. If you plan to grow through winter, you may also want a heater (and a small circulating fan helps a lot, too).
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
Hoklartherm: 30+ years of craftsmanship
Hoklartherm (KGT) specializes in robust, insulated greenhouses designed for demanding climates. They’re known for engineering that holds up for the long haul, with a clean, modern look that feels right at home in a backyard.
Explore HoklarthermDistributed 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
| Distributed by | Exaco |
|---|---|
| Door Dimensions | 38" x 74" |
| Door Type | Dutch |
| Expandable | No |
| Floorspace | 231 sq ft, 280 sq ft, 322 sq ft, 368 sq ft, 413 sq ft |
| Foundation Frame | Available Separately |
| Frame Color | Aluminum |
| Framing Material | Aluminum |
| Length | 17', 19', 23', 26', 30' |
| Made in | Germany |
| Peak Height | 9'10" |
| R-Value | 3.0 |
| Rainwater Collection | No |
| Roof Glazing | 16mm triple-wall polycarbonate |
| Roof Vent Dimensions | 38" x 40" |
| Roof Vent Opener Type | Automatic (wax) |
| Snow Tolerance | 30 psf (ground-snow load) |
| Stem Wall Compatibility | Yes |
| Wall Glazing | 16mm triple-wall polycarbonate |
| Warranty | 10 years (prorated after 5 years) on polycarbonate, 15 years on frame |
| Width | 14' |
| Wind Rating | 120 mph |
| Style | Gothic Arch |
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