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RIGA Greenhouses 4 (135 sq.ft.)

Regular price $6,999.00
Regular price $8,748.75 Sale price $6,999.00
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Before ordering, please confirm that you understand our greenhouses will be delivered by an 18 Wheeler Truck - Confirm that you understand an 18 Wheeler Truck won't have any issues accessing your home. Thank you

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.

Why Choose RIGA?

  • The RIGA 4 Greenhouse is a robust and well-insulated greenhouse, suitable for experienced gardeners and plant enthusiasts.
  • With a size of 135 square feet, this greenhouse features 8 mm twin-wall polycarbonate side walls and 10 mm twin-wall polycarbonate gable ends, offering exceptional thermal insulation and UV protection for your plants.
  • The greenhouse comes with two roof windows with automatic openers, allowing for optimal air circulation and temperature control.
  • A large rear wall window provides additional ventilation and natural light for your plants.
  • The barn-style door with a lock (measuring 30" W x 79" H) ensures easy access and security.
  • Measuring 9'8" W x 14' L x 7'7" H, this greenhouse provides ample space for growing a wide range of plants, making it an excellent option for serious gardeners.
  • The sturdy construction and superior insulation of the RIGA 4 Greenhouse make it suitable for use in various weather conditions, making it an ideal choice for year-round gardening.
  • The RIGA 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 buildings, with 28 years of experience.
  • With strong materials and durable hardware, the Riga Greenhouse is the strongest greenhouse under $5,000.
  • The Riga Greenhouse offers more window and door ventilation than another unit; it is class.
  • The polycarbonate glazing on the Riga Greenhouse is German-made and believed to be of superior quality than the much more common Polygal or GE glazing.
  • The Riga Greenhouse has an optional two-layer shelving system with removable shelf inserts. This allows for tall plants (beans, tomatoes, etc.).
  • The optional 6" high foundation frame can be buried in a trench to easily and securely anchor the greenhouse. This is a great option if other anchoring methods, such as concrete are not desired.
  • One major advantage of Riga's construction method is that the frame profiles are permanently attached 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 the insertion of heavy-duty seed trays. This greenhouse can flex to your gardening needs throughout the year.
  • The RIGA Greenhouse is attractive – it fits well into 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 plants 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


    • 9'8" W x 14' L x 7'7" H
    • 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
      polycarbonate over the 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)