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Hoklartherm RIGA XL Greenhouse (Multiple Sizes Available)

The RIGA XL is truly a greenhouse by the European definition of a greenhouse - designed to be used to grow fresh vegetables, herbs and flowers in the middle of winter. Other “greenhouses” using less than 8 mm twin-wall polycarbonate are considered to be Season Extenders, to be used when only a slight night frost might be expected during the spring or fall season. At best, they can only be used to house established plants during the winter season.
The RIGA XL is truly a greenhouse by the European definition of a greenhouse - designed to be used to grow fresh vegetables, herbs and flowers in the middle of winter. Other “greenhouses” using less than 8 mm twin-wall polycarbonate are considered to be Season Extenders, to be used when only a slight night frost might be expected during the spring or fall season. At best, they can only be used to house established plants during the winter season.

Why Choose RIGA XL?

  • The RIGA XL Greenhouse is designed, engineered, and manufactured in Germany by Hoklartherm, a leading manufacturer of commercial and hobby greenhouses, sunrooms, pavilions, pool covers, home additions, and commercial building, with 28 years experience.
  • With a combination of strong materials and durable hardware, the RIGA XL Greenhouse is an exceptionally strong greenhouse.
  • The RIGA XL Greenhouse offers more window and door ventilation than other units in its class.
  • The 16mm triple-wall polycarbonate glazing on the RIGA XL Greenhouse is German-made and believed to be of superior quality than the much more common Polygal or GE glazing.
  • One major advantage of the RIGA XL's construction method is that the frame profiles are permanently attached to each other, and won't come loose over time due to wind pressures.
  • German engineering - guaranteed top quality!
  • Optional Shelving: Seedtray/Bench shelf and top shelf are available with strong diagonal support braces – can hold a 160 pound man! Twin-wall polycarbonate shelf inserts can be removed to allow for tall plants such as tomatoes or beans or to allow insertion of heavy-duty seed trays. This greenhouse can flex to your gardening needs throughout the year.
  • The RIGA XL Greenhouse is attractive and beautiful to look at – fits well in to an upscale garden setting.
  • Buying a greenhouse is like buying a car, they vary in cost from cheap to very expensive, the RIGA XL is a class similar to a Volkswagen/Volvo – stronger, more durable and better insulated, and offers many more features than the better selling brands.
  • The RIGA XL Greenhouse offers the insulation needed to grow plants year-round – others using less insulation cost too much to heat.
  • RIGA XL Greenhouse units are available in 5 sizes.
  • We recommend you buy one size bigger than you planned.
  • Animated Assembly Video and Assembly Instructions, along with US-based technical and customer support from Exaco.
  • Made in Germany

Additional Images and Information

Click to display more information and larger image

riga xl greenhouse
riga greenhouse front view
riga xl side view
riga xl 3/4 view
riga xl greenhouse 3/4 view 2
riga xl on raised foundation
riga xl greenhouse front with door open
riga xl greenhouse on Brick Foundation
Newly Installed RIGA XL Greenhouse
RIGA XL 9
RIGA XL Interior with Raised Bed
RIGA XL Shelves
RIGA XL Multiple Raised Beds
RIGA XL
RIGA XL
RIGA XL with Tropical Plants
RIGA XL with Andrew for Scale
Close Up of Base Frame
Riga Accessories
Riga XL Knockout Image
Riga XL Knockout Image
Riga XL Knockout Image

Options and Accessories

  • VIEW RIGA GREENHOUSE ACCESSORIES
  • Base frame - 6” high: highly recommended. Attaches to the bottom of the greenhouse and is laid in a trench to anchor the greenhouse without concrete work.
  • Top shelving: Shelving with strong twin-wall polycarbonate inserts (removable) – 10” deep.
  • Regular height shelving: Shelving with strong twin-wall polycarbonate inserts (removable) - 24” deep
  • Two options: twin-wall polycarbonate inserts (flat), or heavy-duty seed trays – to make starting seeds and transplanting easier.
  • Additional Roof Windows with Automatic Openers: recommended in areas where temperatures will reach over 95º F when still using the greenhouse.
    View a roof opener demonstration/installation video.
  • We also recommend you use shade cloth as well, especially during the summer.
  • Adjustable Metal Hooks: Set of 5 metal hooks. These are great for hanging lights, fans and flower baskets (heavier items)
  • Plastic hanger: Set of 10 hangers: These snap into the groves in the aluminum profiles (frame) and are used to attach twine/rope to, to support growth of tall plants (I.e. Tomatoes or beans etc.)

Specifications Details

Sizes Available:

Riga XLs - (9’10” High. 16 mm triple-wall polycarbonate. Heaviest framing)
RIGA XL 5: 14” x 16’5”
RIGA XL 6: 14' x 19'10"
RIGA XL 7: 14’ x 23’
RIGA XL 8: 14’ x 26.3’
RIGA XL 9: 14’ x 29’6”

  • Extremely heavy duty construction
  • First-class insulation: R or K-value 3.0
  • Warranty: Polycarbonate: 10 years; Frame: 15 years
  • Two heavy-duty Dutch Barn Doors (front and back) with keyed lock: 37.5" wide x 74" high.
  • Roof Window(s): 37.5" w x 39.5" h; with Automatic Window Opener
  • 16 mm triple wall polycarbonate
  • Assembly time: 2 to 3 people, 2 days or have it professionally installed.

Top-Quality greenhouse that fills our need entirely.

One of the most solidly-constructed greenhouses I've seen. Customer service at Exaco was well beyone the 'call of duty". They helped thru the entire process, even after the structure was completed and stocked with plants.

Yes! I recommend this product.

Yes! I recommend this product.

Willis Davis, Auburn NY | 6/5/2016


Different Shelving Material

We purchased our first Riga in 2005 and we really like the clear shelving that came with it. It was strong and we could put plants underneath and they still got the light. We purchased a Riga XL in 2015 and the new shelves are white, don't hold as much weight, had to be cut down to fit in the framing and have to be removed completely when growing plants underneath them. Other than this we have really enjoyed the durability and craftmanship as well as the design. Andrew and staff were very knowledgeable and readily accessible for any problems that came up in raising the roof! We have offered to use ours as a model in the area we live for others to view.

Yes! I recommend this product.

David and Elaine | 6/3/2016


Great product and best support I've ever seen.

I looked for a large greenhouse for a year. My wife and I choose the Riga XL because of the size and style. Best of all, we are super happy with the quality of the greenhouse and the support we got from Andrew and his team. I'm 63 and my wife is a little younger. We were able to put it together by ourselves with the great advice we got from Andrew. It took time, and at times was a little frustrating, but it was well worth it. When we ran into problems, Andrew solved the problems quickly and without question about whose fault it was. If I were to buy another greenhouse, The Riga and Andrew would be my first and only choice.

Yes! I recommend this product.

Land Rover Bill | 1/5/2015


What is the price for a RIGA XL?

Unnamed | 2/18/2016

Hello, Thank you for visiting our website. Please call us to discuss pricing for this item.
customerservice@exaco.com 877-760-8500 FREE ext. 701
Thanks, Customer Support


I am trying to get permits for the Riga XL to be in my yard in the city. They say they need a snowload rating and wind rating. Are those available for this model at all?

Gary | 2/7/2016

Hello, Thank you for visiting our website. If you contact our customer service department they will be more than happy to assist you. customerservice@exaco.com 877-760-8500 FREE ext. 701 Thanks, Customer Support


I've had my Riga XL greenhouse for about a year. As the weather has gotten warmer (over 100 inside the greenhouse) the vents at the top are not opening as they have done in the past. Any suggestions how to get them working again?

Leia | 1/18/2016

Hello, Thank you for visiting our website. If you contact our customer service department they will be more than happy to assist you. customerservice@exaco.com 877-760-8500 FREE ext. 701 Thanks, Customer Support

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