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Hoklartherm RIGA Greenhouses (Multiple Sizes Available)

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 is truly a greenhouse by the European definition - 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.
New Animated Video Assembly Instructions for RIGA Greenhouse    -Click Here-

Why Choose RIGA?

  • The RIGA Greenhouse is 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.
  • With a combination of strong materials and durable hardware, the Riga Greenhouse is by far the strongest greenhouse under $5,000.
  • The Riga Greenhouse offers more window and door ventilation than another units it is class.
  • The polycarbonate glazing on the Riga Greenhouse is German made and believed to be of superior quality then the much more common Polygal or GE glazing.
  • The Riga Greenhouse comes with an optional two layer shelving system with removable shelf inserts. This allows for tall plants (beans, tomatoes etc.).
  • The optional 6" high base frame (which is often used to increase the height of the roof), is 2-3" higher than most competitors.
  • 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!
  • Optional Shelving: Seedtray/Bench shelf and top shelf are available with strong diagonal support braces – can hold a 160 pound man! White 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 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 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 Greenhouse offers the minimum insulation needed to grow plant year-round – others using less insulation cost too much to heat.
  • RIGA Greenhouse units are available in 5 sizes
  • We recommend you buy one size bigger than you planned.
  • Come with DVD and written Assembly Instructions
  • Made in Germany

Additional Images and Information

Click to display more information and larger image

Options and Accessories

  • VIEW RIGA GREENHOUSE ACCESSORIES
  • Base frame - 6” high: highly recommended. Attaches to the bottom of the greenhouse. Usually sits in the ground but can also be mounted on top of a wood, concrete or brick frame/wall to provide 5” of additional inside height.
  • Top shelving: Shelving with strong white twin-wall polycarbonate inserts (removable) – 10” deep.
  • Regular height shelving: Shelving with strong white 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

  • Extremely heavy duty construction
  • First-class insulation: R or K-value 3.0
  • Warranty: Polycarbonate: 10 years; Frame: 15 years
  • Heavy duty Dutch Barn Door with keyed lock: 30" wide x 72" tall. 72” tall narrow unit /79” tall wide unit
  • Oversized Rear Wall window: 30" wide x 42" high with adjustment arm
  • Roof Window(s): 40" w x 24" d; with Automatic Window Opener
  • 8 MM UV coated twin wall
    polyvcarbonate over main body
  • 10 MM twin wall polycarbonate in front & back walls for extra strength
  • Inside walking height: 6’1” near shelves, 6’11” in the middle of the narrow unit and 7’6” high for a wide unit.
  • Assembly time: 2 people, 1 full day (3 makes it easier and reduces it to 6-8 hours (excluding any shelves)
RIGA 2S RETAIL AT: $2799.00
RIGA 2S FOUNDATION FRAME RETAIL AT: $349.00
RIGA 2S TOP SHELF RETAIL AT: $170.00
RIGA 2S BOTTOM SHELF RETAIL AT: $209.00
RIGA 3 RETAIL AT: $3499.00
RIGA 3 FOUNDATION FRAME RETAIL AT: $499.00
RIGA 3 TOP SHELF RETAIL AT: $219.00
RIGA 3 BOTTOM SHELF RETAIL AT: $299.00
RIGA 3S RETAIL AT: $3399.00
RIGA 3S FOUNDATION FRAME RETAIL AT: $425.00
RIGA 3S TOP SHELF RETAIL AT: $219.00
RIGA 3S BOTTOM SHELF RETAIL AT: $299.00
RIGA 4 RETAIL AT: $4599.00
RIGA 4 FOUNDATION FRAME RETAIL AT: $640.00
RIGA 4 TOP SHELF RETAIL AT: $299.00
RIGA 4 BOTTOM SHELF RETAIL AT: $389.00
RIGA 4S RETAIL AT: $4199.00
RIGA 4S FOUNDATION FRAME RETAIL AT: $560.00
RIGA 4S TOP SHELF RETAIL AT: $299.00
RIGA 4S BOTTOM SHELF RETAIL AT: $389.00
RIGA 5 RETAIL AT: $5199.00
RIGA 5 FOUNDATION FRAME RETAIL AT: $699.00
RIGA 5 TOP SHELF RETAIL AT: $359.00
RIGA 5 BOTTOM SHELF RETAIL AT: $499.00
ADDITIONAL ROOF WINDOW RETAIL AT: $230.00
AUTOMATIC WINDOW OPENER RETAIL AT: $75.00
REPLACEMENT PISTON FOR AUTOMATIC WINDOW OPENER RETAIL AT: $30.00
RIGA ASSEMBLY FACILITATION KIT RETAIL AT: $99.99
ROOF WINDOW RESTRAINT 2 15" SYSTEM RETAIL AT: $15.99
ROOF WINDOW RESTRAINT 4 15" SYSTEM RETAIL AT: $29.99
ROOF WINDOW RESTRAINT 8 15" SYSTEM RETAIL AT: $59.99
ADJUSTABLE METAL HOOKS RETAIL AT: $15.99
PLASTIC HOOKS RETAIL AT: $15.99
HEAVY DUTY SEED TRAYS RETAIL AT: $24.99
MISTING SYSTEM RETAIL AT: $160.00
DOOR EXTENSION KIT FOR 2S, 3S, 4S RAISES GREENHOUSE 20" RETAIL AT: $250.00
DOOR EXTENSION KIT FOR 3, 4, 5, RAISES GREENHOUSE 20" RETAIL AT: $299.00
DOOR EXTENSION KIT FOR XL RAISES GREENHOUSE 20" RETAIL AT: $699.00

I want to compliment the company on the precision and fit of this unit.

My name is Claude Keefer and I helped the Elmwood Ag classes and Teacher Ms. Lafollette with the assembly of the Riga V Greenhouse that they purchased. I spoke with Andrew on Saturday 5 Dec 15 in preparation for beginning the assembly. As you recall, we build the unit offsite and transported it to the school last Friday. Photos are attached.

I want to compliment the company on the precision and fit of this unit. I was very impressed with the total system and the fit and finish were outstanding. I honestly did not expect everything to line up and fit the way it did. Every bolt hole lined up with others and spacing around the doors and windows was quite good. I really like the "bagging" of parts with labels for doors, windows etc. That made searching for parts less of a problem. Nylon ends for the top and bottom of the side ribs was very valuable.

We we fortunate to have a place to build the unit on a flat surface and we did not rush. Unpacking, preparing the base unit and the lifting platform took about 6-8 hours. With about 5 boys we assembled the end walls and the main body in 8 hours. Another 6-8 hours were spend with braces, window/door assembly and seals/silicone. Finally, we loaded the unit on a flat bed, hauled it to town (4miles) and put it into position on a prepared flat pad. The inside was filled with pea gravel and the outside was backfilled. 8 hours.

The engineering is great! My only recommendation on the manual is to be sure that all the photos indicate whether you are looking from the outside or the inside.

claude riga 4
claude riga 5
claude riga 2
claude riga 3

Yes! I recommend this product.

Claude Keefer | 12/15/2015


Excellent and Tough in Broken Arrow Oklahoma!

We bought our Riga IV greenhouse back in August of 2009 and we are so glad we did. Our Oklahoma weather includes temperature extremes, high winds, hail and tornadoes and our Riga greenhouse has survived it all nearly unscathed. Our home was damaged by a tornado in May of 2015 and even though our entire roof needed to be replaced on our main home, some siding needed to be replaced, and our garage door needed to be replaced on our main home, our Riga greenhouse was fine. We only needed to replace a couple of the auto-vents on the greenhouse that were bent from the wind during the tornado. I fully expected this greenhouse to be damaged by hail storms that we have experienced here since we purchased our Riga IV and it was not damaged by the hail either even though we had to make an insurance claim for hail damages on our main home. Because of the extreme weather we have here in Oklahoma we purchased the Riga model that has the foundation base frame to help secure it to the ground. We also topped off the foundation base frame with bricks for added weight ~ see photos. The people here at Exaco Trading Company are very helpful and friendly. We are extremely pleased with this greenhouse and since 2009 it is working wonderfully for us! :-D

wendy riga 1
wendy riga 2
wendy riga 3
wendy riga 4

Yes! I recommend this product.

Wendy Sue | 12/4/2015

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