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10203-B Metropolitan Dr.
Austin, TX 78758

(877) 760-8500


RIGA XL Greenhouse Available
in Several Sizes

Riga XLs - (910 High. 16 mm triple-wall polycarbonate. Heaviest framing):
RIGA XL 5: 14 x 165
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 296


View Wholesale Pricing Information

View Warranty Information

Why buy a RIGA and not another brand?

RIGA Optional Accessories - Click Here

Why Buy Riga Extra Large?

  • The RIGA 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. While other so called “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 Extra Large – 16 mm polycarbonate - is the largest commercial quality hobby-kit type greenhouse now available in the country
  • Designed, engineered, and manufactured in Germany by Hoklartherm, a leading manufacturer of commercial and hobby greenhouses, sunrooms, pavillions, pool covers, home additions, and commercial building, with 28 years experience.
  • For shelving options, see our other RIGA products.
  • The insulation factor is an incredible: R-2.0
  • With a combination of strong materials and durable hardware, the Riga is by far the strongest greenhouse of its size under $10,000.
  • The Riga XL offers 4 large roof windows - each with an automatic opener.
  • The Riga XL comes with 4 "L-shaped" anchor bars (which attach to the inside of the base profiles) to attach the greenhouse to a concrete or wood frame.
  • The polycarbonate glazing on the Riga is German made and believed to be of superior quality then the much more common Polygal or GE glazing.
  • One major advantage of the Riga'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!
  • The Riga comes with an optional two layer shelving system with removable shelf inserts. This allows for tall plants (beans, tomatoes etc.).
  • Optional shelving: suspended shelving without braces underneath – therefore allowing for more storage space ( i.e. for a cart, wheelbarrow or long tools). Currently only shelving up to 17’ (RIGA V) is available for the RIGA XL. See other RIGA sizes for shelving details and pricing.
  • Optional top shelf hangs forward – easier to reach, but also does not block outside light from reaching bottom shelf.
  • Both shelves use twin-wall polycarbonate as the insert (the flat part) material, allowing for much better and more even light distribution through the greenhouses. Most other types of shelving are dark structures which do not let light through – or very badly at best.
  • The RIGA 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 is a class similar to a BMW/Mercedes – stronger, more durable and better insulated, and offers many more features than the better selling brands.
  • The RIGA XL offers the maximum possible insulation currently available in a real greenhouse requiring the least amount of energy for its size: ~20,000 BTU (depends on your climate).
  • Comes with DVD and written Assembly Instructions
  • Made in Germany


  • Extremely heavy duty construction
  • First-class insulation: R-2.0
  • Warranty: Triple Wall Polycarbonate: 10 years – prorated after 5 years.
  • Two wide doors - Horse Barn style - 38" wide x 72" high - 1 in the front one in the back
  • 16 mm UV coated TRIPLE-wall Polycarbonate Glazing on all 4 sides.
  • Interior area 10’ wide x 20’ long has a minimum of 6 feet to 10 feet in ceiling height.
  • Assembly time: 2 to 3 people: 2 days.

Optional Items:

  • Foundation Frame/Base available: 5" h x 3" wide. This "C-shaped" Base sits in the ground and is the factory's preferred anchoring system. Simply dig a trench 6" (throw the dirt to the outside) place the Foundation Frame build the greenhouse and than backfill the trench and the Foundation Frame with the removed dirt. Stamp it down and no winds (except tornedos or hurricanes) will remove the unit. This is an easier option than building your own frame.
  • Top shelving: Suspended shelving with polycarbonate inserts (for more light): 14” deep. Maximum available length: up to 17 feet (see other RIGA sizes for shelving options)
  • Regular height shelving: Suspended shelving with out braces, allows for larger equipment to be stored underneath, 25” deep .Maximum available length: up to 17 feet (see other RIGA sizes for shelving options)
  • Two options: twin-wall polycarbonate inserts (flat), or heavy duty seed trays – to make starting seeds and transplanting easier.
  • 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.)

RIGA Greenhouse Flyer
RIGA Assembly Parts List

Click for Manufacturer Info

Scroll to bottom of page to view product reviews


Do you prefer organic vegetables, fresh cut flowers, and tomatoes in middle of the winter? How about color in your backyard — year round? It is all possible with a RIGA greenhouse.
The best possible value in its class.

Click image to see larger version.

Roof opener video
RIGA XL Greenhouse
RIGA XL Greenhouse

"The XL8 has far exceeded our expectations. We are giving tomatoes away!

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Base Frame Detail View
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Foundation Frame Profile View
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ClickHere to View More Accessories!


Willis Davis, Auburn NY | 6/5/2016

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.

David and Elaine | 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.

Land Rover Bill | 9 months ago

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.


Larry | 11/8/16

If I plan to build a concrete footing to support the XL 5, is there an advantage to using the aluminum foundation?

Exaco Customer Support | 11/8/16

Larry, the foundation frame is an optional item but if you get it you do not need a perimeter wall made of concrete. Different retailers sell it different ways - some include the foundation frame in their kits. The original Costco kit is the best deal. Costco dropped it but it is now available from several of our other retailers.

Unnamed | 2/8/16

What is the price for a RIGA XL?

Exaco Customer Support | 4 Months Ago

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

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