Hoklartherm | Riga Greenhouse Series, Premium German-Made Polycarbonate Greenhouses
Hoklartherm
Item:
- Regular price
- $5,099.00
- Regular price
- $5,999.00
- Sale price
- $5,099.00
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Estimated Arrival: Between Jun 22 and Jun 29.
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Free Shipping to the 48 Contiguous States including Lift Gate Service
Free Shipping to the 48 Contiguous States including Lift Gate Service
Our Shipping Policy Page has details of our Free Shipping to the 48 contiguous states with Lift gate Service included, as well as other things you should know.
No Sales Tax (except in GA)
No Sales Tax (except in GA)
Price Match
Price Match
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Before You Purchase
Before You Purchase
Before you Purchase has several things to consider before ordering a large greenhouse or building. You should also review our Refund Policy.
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PRODUCT DESCRIPTION
The Hoklartherm Riga Greenhouse Series is designed for gardeners who want more than a lightweight seasonal greenhouse. With insulated polycarbonate glazing, a reinforced aluminum frame, and the distinctive curved Gothic shape that Riga is known for, these German-engineered greenhouses provide a durable and practical growing environment for year-round gardening, seed starting, overwintering plants, homesteading, educational programs, and extended-season food production.
Whether you are a serious backyard gardener, a homesteader looking for more control over your growing season, a school building a hands-on STEM garden, or a retiree investing in a long-term gardening lifestyle, the Riga Series offers a thoughtful balance of strength, insulation, ventilation, and usable growing space.
The Riga S, Riga L, and Riga XL models give gardeners several size options, from compact backyard greenhouses to large-scale growing structures. Each model is built around the same practical idea: protect your plants, extend your season, and create a greenhouse that performs well beyond one growing cycle.
SPECIAL ORDERS (XL5, XL7, XL8)
Please note that special-order items are not kept in stock, and the estimated lead time is approximately 12 to 16 weeks.
KEY FEATURES
German-Engineered Performance
Built by Hoklartherm in Germany, the Riga Series is known for durable construction, practical ventilation, and strong insulation for serious growing.
Excellent for All-Season Gardening
Insulated polycarbonate glazing helps support seed starting, season extension, winter plant protection, and year-round growing when paired with the right growing practices.
Strong Choice for Homesteaders
The Riga Series helps gardeners grow more food, start plants earlier, protect crops longer, and gain more control over seasonal changes.
Suitable for Educational Greenhouses
Polycarbonate glazing, durable framing, and multiple size options make Riga a practical greenhouse choice for school gardens, STEM programs, and community growing projects.
Curved Gothic Shape
The rounded profile helps shed snow, reduce wind resistance, and create more usable growing space along the greenhouse sidewalls.
Long-Term Gardening Investment
For gardeners planning to grow for many years, Riga offers a more substantial greenhouse structure than many entry-level hobby kits.
SPECIFICATIONS
Riga S2 Greenhouse
7ft x 7ft 8in
DimensionsLength: 7ft
Width: 7ft 8in
Peak Height: 7ft 1in
Growing Area: 54 sq. ft.
Frame
13-gauge aluminum frame
Curved Gothic shape for snow shedding and wind deflection
Glazing
8mm twin-wall polycarbonate sidewalls
10mm twin-wall polycarbonate front and back gable panels
What’s Included
1 roof vent with auto opener
1 Locking barn-style hinged door
1 rear window
Hardware
Assembly documentation
Riga S3 Greenhouse
10ft 6in x 7ft 8in
DimensionsLength: 10ft 6in
Width: 7ft 8in
Peak Height: 7ft 1in
Growing Area: 81 sq. ft.
Frame
13-gauge aluminum frame
Curved Gothic shape for snow shedding and wind deflection
Glazing
8mm twin-wall polycarbonate sidewalls
10mm twin-wall polycarbonate front and back gable panels
What’s Included
1 roof vent with auto opener
1 Locking barn-style hinged door
1 rear window
Hardware
Assembly documentation
Riga S4 Greenhouse
14ft x 7ft 8in
DimensionsLength: 14ft
Width: 7ft 8in
Peak Height: 7ft 1in
Growing Area: 108 sq. ft.
Frame
13-gauge aluminum frame
Curved Gothic shape for snow shedding and wind deflection
Glazing
8mm twin-wall polycarbonate sidewalls
10mm twin-wall polycarbonate front and back gable panels
What’s Included
1 roof vent with auto opener
1 Locking barn-style hinged door
1 rear window
Hardware
Assembly documentation
Riga L3 Greenhouse
10ft 6in x 9ft 8in
DimensionsLength: 10ft 6in
Width: 9ft 8in
Peak Height: 7ft 7in
Growing Area: 102 sq. ft.
Frame
13-gauge aluminum frame
Curved Gothic shape for snow shedding and wind deflection
Glazing
8mm twin-wall polycarbonate sidewalls
10mm twin-wall polycarbonate front and back gable panels
What’s Included
1 roof vent with auto opener
1 Locking barn-style hinged door
1 rear window
Hardware
Assembly documentation
Riga L4 Greenhouse
14ft x 9ft 8in
DimensionsLength: 14ft
Width: 9ft 8in
Peak Height: 7ft 7in
Growing Area: 135 sq. ft.
Frame
13-gauge aluminum frame
Curved Gothic shape for snow shedding and wind deflection
Glazing
8mm twin-wall polycarbonate sidewalls
10mm twin-wall polycarbonate front and back gable panels
What’s Included
2 roof vents with auto openers
1 Locking barn-style hinged door
1 rear window
Hardware
Assembly documentation
Riga L5 Greenhouse
17ft 6in x 9ft 8in
DimensionsLength: 17ft 6in
Width: 9ft 8in
Peak Height: 7ft 7in
Growing Area: 165 sq. ft.
Frame
13-gauge aluminum frame
Curved Gothic shape for snow shedding and wind deflection
Glazing
8mm twin-wall polycarbonate sidewalls
10mm twin-wall polycarbonate front and back gable panels
What’s Included
4 roof vents with auto openers
1 Locking barn-style hinged door
1 rear window
Hardware
Assembly documentation
Riga XL5 Greenhouse
16ft 5in x 14ft
DimensionsLength: 16ft 5in
Width: 14ft
Peak Height: 9ft 10in
Growing Area: 231 sq. ft.
Frame
13-gauge aluminum frame
Large Gothic structure with expanded interior height and width
Glazing
16mm triple-wall polycarbonate panels
Designed for stronger insulation and serious year-round growing
What’s Included
4 roof vents with auto openers
2 Locking barn-style hinged doors
Hardware
Assembly documentation
Riga XL6 Greenhouse
19ft 10in x 14ft
DimensionsLength: 19ft 10in
Width: 14ft
Peak Height: 9ft 10in
Growing Area: 280 sq. ft.
Frame
13-gauge aluminum frame
Large Gothic structure with expanded interior height and width
Glazing
16mm triple-wall polycarbonate panels
Designed for stronger insulation and serious year-round growing
What’s Included
4 roof vents with auto openers
2 Locking barn-style hinged doors
Hardware
Assembly documentation
Riga XL7 Greenhouse
23ft x 14ft
DimensionsLength: 23ft
Width: 14ft
Peak Height: 9ft 10in
Growing Area: 322 sq. ft.
Frame
13-gauge aluminum frame
Large Gothic structure with expanded interior height and width
Glazing
16mm triple-wall polycarbonate panels
Designed for stronger insulation and serious year-round growing
What’s Included
6 roof vents with auto openers
2 Locking barn-style hinged doors
Hardware
Assembly documentation
Riga XL8 Greenhouse
26ft 3in x 14ft
DimensionsLength: 26ft 3in
Width: 14ft
Peak Height: 9ft 10in
Growing Area: 368 sq. ft.
Frame
13-gauge aluminum frame
Large Gothic structure with expanded interior height and width
Glazing
16mm triple-wall polycarbonate panels
Designed for stronger insulation and serious year-round growing
What’s Included
6 roof vents with auto openers
2 Locking barn-style hinged doors
Hardware
Assembly documentation
Riga XL9 Greenhouse
29ft 6in x 14ft
DimensionsLength: 29ft 6in
Width: 14ft
Peak Height: 9ft 10in
Growing Area: 413 sq. ft.
Frame
13-gauge aluminum frame
Large Gothic structure with expanded interior height and width
Glazing
16mm triple-wall polycarbonate panels
Designed for stronger insulation and serious year-round growing
What’s Included
8 roof vents with auto openers
2 Locking barn-style hinged doors
Hardware
Assembly documentation
WHAT'S INCLUDED
Each Riga greenhouse includes the aluminum frame, polycarbonate glazing panels, barn-style hinged locking door system, roof vents, automatic roof vent openers, required hardware, and manufacturer assembly documentation.
Riga S and Riga L models also include a rear window for additional natural ventilation. Riga XL models include two locking barn-style doors and multiple automatic roof vents depending on model size.
INSTALLATION GUIDE
Riga greenhouses should be installed on a level, secure foundation. Proper anchoring is important for long-term structural performance, especially in areas with wind, snow, or shifting soil conditions.
Common installation options include a concrete strip foundation or the optional Riga foundation base. Always review the manufacturer assembly manual before beginning installation and check local permit requirements before ordering.
PRODUCT VIDEO
RIGA GREENHOUSE INSTALLATION VIDEO
MAINTENANCE AND CARE
Clean the Polycarbonate Panels
Use mild soap and water as needed. Avoid abrasive cleaners that may scratch or damage the glazing surface.
Inspect Roof Vents
Check automatic openers seasonally to make sure the vents open and close smoothly as temperatures change.
Monitor Snow Accumulation
The curved shape helps snow slide off, but heavy snow buildup should still be monitored and cleared when necessary.
Check Anchoring
Inspect the greenhouse foundation and anchors after severe weather or seasonal ground movement.
OPTIONAL ACCESSORIES
Available Riga accessories may include foundation bases, drop door kits, additional roof vents, vent openers, roof vent restraint cable systems, sash locks, top shelves, bottom shelves, seed trays, exhaust fans, solar-powered exhaust fans, intake vents, greenhouse heaters, digital thermostats, plant hooks, misting systems, solar lights, grow lights, wheelbarrow ramps, and T-bolts.
Accessory bundles may also be available for select Riga and Riga XL models, including shelving and foundation frame packages.
Warranty
- Polycarbonate: 15 Year Limited Warranty (prorated after 5 years)
- Frame: 15 Year Limited Warranty
MANUFACTURER INFO AND UNIQUE SELLING POSITION
Hoklartherm is a German greenhouse manufacturer known for producing high-quality greenhouses, conservatories, pavilions, patio roofs, and solar verandas. The Riga Series reflects Hoklartherm’s focus on strong aluminum profile systems, insulated glazing, practical airflow, and long-term structural performance.
The Riga Series stands out because it is built for gardeners who want dependable growing performance instead of a short-term seasonal structure. Its curved Gothic shape, insulated polycarbonate panels, heavy-duty aluminum frame, and automatic ventilation make it a strong fit for serious gardeners, homesteaders, educators, and all-season growers.
Riga greenhouses are also well suited for educational and community growing programs. The insulated polycarbonate glazing provides a safer and more forgiving learning environment than traditional glass, while the different size options allow schools, garden clubs, and community organizations to choose a greenhouse that fits their space, budget, and teaching goals.
For many homeowners, the Riga Series is also a long-term investment in a more productive and enjoyable gardening lifestyle. It can support food production, plant protection, seed starting, tropical plant overwintering, and quiet year-round time in the garden.
FREQUENTLY ASKED QUESTIONS
Is the Riga greenhouse suitable for year-round growing?
Yes. The Riga Series is well suited for extended-season and year-round growing in many climates when paired with proper ventilation, heating, shading, and growing practices. The insulated polycarbonate glazing helps retain heat better than thin single-layer coverings.
Is the Riga greenhouse a good choice for homesteaders?
Yes. Riga greenhouses are a strong fit for homesteaders who want to start seeds earlier, protect crops longer, overwinter plants, and improve food-growing reliability through changing seasons.
Can the Riga greenhouse be used as an educational greenhouse?
Yes. The Riga Series is a practical option for school gardens, STEM programs, community gardens, and hands-on growing education. The polycarbonate glazing is more impact-resistant than glass, and the insulated design helps create a more stable growing environment for learning.
Which Riga model is best for a small backyard?
The Riga “S” models are best for smaller spaces because they provide strong insulation and durable construction in a more compact footprint. They are a good choice for suburban gardens, smaller yards, and gardeners who want serious performance without choosing a large greenhouse.
Which Riga model is best for serious all-season growing?
The Riga XL models are best for serious all-season growing because they offer more interior space, taller height, two doors, multiple automatic roof vents, and 16mm triple-wall polycarbonate glazing for stronger insulation.
Is Riga a good greenhouse for retirees or long-term homeowners?
Yes. Many long-term homeowners choose Riga because it is designed as a durable, practical greenhouse investment. It supports productive gardening, plant protection, and a more enjoyable year-round gardening lifestyle.
Can Riga greenhouse be extended for future growth?
No, there is no extention kit for Riga. Since they cannot be extended, we recommend that you buy one size bigger than you planned.
Why This Greenhouse Is Worth Buying From Us
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100% FREE Shipping
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No Sales Tax
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Financing Available
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Price Match
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American Owned Business
Let customers speak for us
The kit had everything in it to rebuild the pump. Everything fit great. Would purchase this kit again.
Also, product was delivered in a reasonably timely manner.
I bought a 20x 9 Ft aluminum lean-to for my wife’s flowers. The mygreenhousestore folks answered all of my pre- order questions very well and their technical support was excellent for the few questions I had during construction. You have to acclimate yourself to the instructions and the well labeled parts,, but the construction goes well.
My wife loves it!!
The customer service, experience and care from both mygreenhousestore.com and from Exaco have been nothing short of an absolute joy! This cabin is adorable, well made and a good size for my needs. Though I have no intention of using it as a grill cabin, but rather as a work/office space for clients, yoga classes and small workshops/retreats, it could also easily function as a guest cabin. The natural wood is gorgeous. The price is fair. The craftsmanship and attention to detail are refreshing in a world so often using mass produced items.
It was very difficult to get these parts from Harvest Right without going through some 3rd party service that wanted to charge me a fee over the phone to diagnose what I already knew. So thank you for having these. It helped greatly!!
Love this Exact 2-N-1 Kitchen Compost Bucket! Perfect size, very tasteful looking, and very easy to use!
Just finished my Victorian 36 greenhouse. It was quite a challenge doing it mostly by myself but the engineering and fit was amazing. Everything we needed came with it and was well organized. Hope to have it filled up soon. I will say though, the directions and construction guide could use some real help. It was way too vague and left out many steps that would have been very helpful down the line. A step by step video would be great. Overall very happy with it!
Exactly what I need pretty quick shipping
I was looking for a vinyl/plastic shed rather than metal or wood for the side of my garage. This shed works perfectly, but I'd be cautious in a windy/wet environment unless you apply extra silicone sealant and properly anchor it.
Shed assembly time was about 6 hours by myself, and all of the instructions were easy to follow. There is also a video online that you can use as an assembly reference, but it doesn't replace the step-by-step instructions.
I would buy it again.
Works well, we have ran about 20 batches through it so far and it does an excellent job.
This is the standard roof vent opener for my greenhouse. I needed to replace both of mine after several years of use.
I still havnt received it, been shipping keeps getting delayed.
I had a great experience with Rep. Steve. He made sure to listen to my needs and helped make my experience easy. The greenhouse is amazing! I would suggest purchasing screens and or shading because it can get really hot inside even with the windows opening. I plan to use mines as a sunroom/outdoor area so not quite finish with everything. However I have attached Pic of the build.
Seller was very courteous and attentive to my needs. Materials arrived quickly. I would order again.
We purchased this igloo at the beginning of November and it has been one of the best investments we have made in our outdoor space. We have a nice deck and patio that we use during the Spring. Summer and Fall here in Northwest Ohio with many comforts like cozy outdoor furniture and an outdoor TV and outdoor kitchen. But in the winter it sits empty. This igloo now sits on that patio with some of our outdoor furniture inside of it. We put 2 electric space heaters in it and it keeps it quite warm inside. We are able to enjoy our patio now in the winter. Everyone of our friends and family love it. We even set it up to have a big Igloo party just before Christmas with 10 people in it. Most of the time, we have it set up with some outdoor recliners and an outdoor loveseat to fit 4 to 5 people. We put lights inside it and even bring a little 21 inch TV out there to watch every now and then. We have so much fun sitting outside in the winter drinking wine and enjoying our patio. Thank you so much, my greenhouse store for this item. They were very helpful in answering all the questions I had about it when I called them and the shipping was very fast. We love it and I'm sure we will love it for many years to come.
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