888-840-5303 Call us for help.
Free Shipping On everything.
   My Account | shopping cart Cart (0) | Checkout  
888-840-5303 Call us for help.
Free Shipping On everything.
Found a lower price? Call us. We will beat it.
Filter By
School Greenhouses
Lean-To Greenhouses
Cold Frames
Raised Garden Beds
  Cooling & Ventilation
  Benches & Shelving
  Shade Cloths & Covers
  Growing & Composting
  Rain Barrels & Watering
Storage Sheds
Cross Country
Early Start
Harvest Right
Little Cottage Company
Outdoor Living Today
Rhino Shelter
Riverstone Industries
Santa Barbara
Spring Gardener
Sunshine GardenHouse

[MPN: Riga XL 8]

List Price: $15999.00
Our Price: $12399.00
Available Options:
Base Kit:
Complete Accessory Kit:
Drop Down Door:
Single Top Shelf:
Quantity Availability: In Stock

We'll beat any online competitor's price!

If you find this item at a lower price elsewhere including shipping and any taxes, please email us or give us a call and we will do everything we can to beat any valid online competitor's price! Be sure to include the link to the other site.

*We can not price match local stores, warehouses, price clubs, or prior sales and the item must be new and in stock. Please see our guarantee for more details.

  • Free Shipping
  • Authorized Retailer
  • Full Warranties
  • Lifetime Support
  • Low Price Guarantee
  • No Sales Tax* (only TX)
  • Secure Ordering
  • Superior Customer Service

15 year limited warranty The commercial-grade Riga XL 8 from Hoklartherm, the leading builder of premier greenhouses in Germany, is a beautiful addition to any garden. Its spacious 14X26 interior gives you space for anything you decide to grow, and many customers use it as an outdoor sunroom or even for a hot tub or indoor pool enclosure.

Shipping included for the contiguous United StatesThe peak height of ten feet allows room for tall plants and growing trees, and there is sufficient interior space for the most avid gardeners. The heavy duty frame is made of reinforced aluminum and the unique "onion" design allows the greenhouse to withstand inclement weather with ease. Nothing short of tornados or hurricanes have ever destroyed a Hoklartherm Riga Greenhouse.

Hoklartherm Riga greenhousesThe Riga XL 8 includes four roof windows, all of which have automatic openers to help keep the interior well-ventilated and at a comfortable temperature. The lockable, Dutch doors on each end provide easy access and are designed for quick installation.

Hoklartherm Riga XL 16mm Triple-Wall Polycarbonate PanelsThe best in class 16mm triple-wall polycarbonate panels provide maximum insulative value and safety. They are extremely durable and are virtually unbreakable and provide three times the efficiency in terms of heat conductivity of even 8mm twin-wall polycarbonate. Gutters are not needed as the Riga's unique design naturally diverts water away from the foundation.

Despite its large size, the greenhouse can be assembled in as little as a weekend depending on how much help you have. The process can be sped up if the site of assembly is prepared ahead of time by leveling it and installing whatever type of flooring and foundation is preferred.

The Riga XL 8 is the type of premium greenhouse which adds to the value of your home. It can serve multiple purposes and its superior build quality ensures that it will stay looking new long after it is assembled. With its durability, attractive design, and spacious interior, the Hoklartherm Riga XL 8 Greenhouse is sure to become a showpiece for your family for many years to come.

Hoklartherm Riga XL 8 Greenhouse (14X26) from ExacoHoklartherm Riga XL Greenhouse (14X20) from Exaco


  • Model: Riga XL 8
  • UPC code: 017783306007
  • Nominal size: 14' width x 26' length
  • Exterior dimensions: 14' 2" width x 26' 3" length x 10' peak height
  • Color: anodized aluminum with smooth finish
  • Floor space: 368 sq. ft.
  • Roof windows: 6 large 37.5" width x 39.5" length vents, all with temperature-adjustable, electricity-free automatic openers
  • Best in class 16mm triple-wall polycarbonate panels are UV-protected, have a R-value of 2.5 and K-value of 2.3 (three times more efficient than even 8mm twin-wall polycarbonate), and are virtually unbreakable
  • Heavy duty aluminum frame is greatly sloped with a high peak to allow rain and snow to easily run off and can easily support the weight of an adult
  • Frame profiles are thicker than comparably priced structures for added strength
  • Constructed so that the frame profiles are attached to each other in a manner that ensures that they will stay intact even in high winds
  • High ratio of paneling to frame width allows for maximum light trasmittance and less "moving" shade
  • Heavy duty rubber seals are used on all windows, doors, and the top and bottom of the large side glazing panels for complete weathersealing
  • Two strong Dutch doors on each end with wide openings for easy access and maximum ventilation; both doors include keyed handles and are 37.5" width x 74" height
  • Tall peak height allows for plenty of working room inside the greenhouse without having to stoop and more room for shelving
  • Gutter and downpipes are not needed because of the unique frame design
  • Beautiful design to fit any garden
  • Includes 4 L-shaped anchor bars which attach to the inside of the frame base profiles to attach the greenhouse to a concrete or wood frame
  • Riga greenhouses have withstood all inclement weather when properly installed and anchored short of tornados and hurricanes
  • Note: Some images may show the greenhouse with the optional accessories or items such as flowers or tables or chairs which are not included
  • Note: Please be sure to check your local building code for any required permits
  • Note: All Hoklartherm greenhouses are special ordered by Exaco and individually inspected and packed with a 1 to 4 week lead time depending on inventory levels and so returns are expensive; please let us know if you have any questions at all
  • Designed, engineered, and manufactured by Hoklartherm, the top maker of premium greenhouses and outdoor pavilions in Germany
  • Imported by Exaco Trading Co. and shipped from their Austin, TX warehouse
  • Includes comprehensive assembly manual along with a DVD showing each stage of assembly
  • Assembly usually takes just one weekend with two people (three is preferable) with ordinary household tools as there are no eaves and relatively few connections
  • Maintenance-free design means the Riga only needs occasional washing with a garden hose and recommended annual tightening of all nuts and bolts
  • Friendly toll-free technical support available from Exaco for installation help
  • Ships in eight carefully packed and inspected boxes via ground freight, seven on one pallet and one 20' long tube
  • Box 1 (straight profiles - aluminum): 234" x 8" x 8 " at 180 lbs., Box 2 (parts and rubber seals): 14" x 14" x 15" at 18 lbs., Box 3 (curved profiles - aluminum): 144" x 3" x 4" at 21 lbs., Box 4 (curved profiles - aluminum): 144" x 8" x 4" at 85 lbs., Box 5 (straight profiles - aluminum): 168" x 8" x 8" at 100 lbs., Box 6 (straight profiles - aluminum): 108" x 8.5" x 7.5" at 102 lbs., Box 7 (triple wall Lexan glazing): 154" x 39" x 6" at 180 lbs., Box 8 (triple wall Lexan glazing): 154" x 39" x 6" at 180 lbs.
  • Shipping weight: 686 lbs.
  • Exaco and Hoklartherm stand by their greenhouses and work to make you 100% satisfied
  • 15 year limited warranty on frame and 10 year limited warranty on polycarbonate, prorated after 5 years

Optional Accessories

Hoklartherm Riga Greenhouse BaseBase Kit - The base kit used when the Riga greenhouse is assembled directly onto the earth without the use of any concrete or pressure-treated wood foundation. It is made of reinforced aluminum for added durability and ensures that the frame is perfectly square. The lip of the base is actually meant to be placed in the ground, and the base kit is not needed when the greenhouse is already being anchored to a wood or concrete base. The shipping box is 240 inches long by 10 inches wide and deep and weighs 95 pounds.

Complete Accessory Kit - Many of the accessories that you would need to complete your greenhouse growing experience have been assembled into one kit. It includes a heater, exhaust vent, thermostat, solar light, 14' top shelf, 14' bottom shelf, 5 seed trays, 10 stainless steel hooks, and 10 plastic hooks.

Dayton 'Big Red' HeaterDayton 'Big Red' Heater - This electric heater generates 13,000 BTU using a 220V connection and is sufficient to keep the Riga heated on cold days.

JD Manufacturing Exhaust Vent and ThermostatJD Manufacturing Exhaust Vent and Thermostat - This ventilation system uses a 20 inch exhaust fan with a thermostat to help keep your greenhouse properly ventilated on warm days. The exhaust vent runs on a 110V connection at 3400 CFM and the single speed thermostat runs on either 115V or 230V at 10 amps and 60 hertz.

Gama Sonic solar lightGama Sonic solar light - The solar light includes an external solar panel and battery pack with an internal light system to provide plenty of light for working in your greenhouse at night.

Hoklartherm Riga top and bottom shelvesRiga Top and Bottom Shelves - The accessory kit includes two hanging shelves for one side of your greenhouse. This allows for more floor space and the shelves are strong enough to support the weight of an adult. The top shelf is 14 feet long and 14 inches deep and the bottom shelf is 14 feet long and 25 inches deep.

Riga Heavy Duty Seed TraysHeavy Duty Seed Trays - These polypropylene black seeds trays are made in Germany and are perfect for starting seeds in your greenhouse. Five are included with the complete accessory kit they are each 24 inches long x 16 inches wide x 3.5 inches deep.

Riga Adjustable Stainless Steel HooksAdjustable Stainless Steel Hooks - Ten of these hooks are included with the complete accessory kit. These are perfect for holding lights or flower baskets and other hanging plants.

Riga Moveable Plastic HooksMoveable Plastic Hooks - The complete accessory kit for the Riga XL includes 10 moveable plastic hooks. These are used for helping orient growing plants such as tomatoes or string beans.

Hoklartherm greenhouse 20 inch drop down doorDrop Down Door - An extra panel can be placed about the door of the Riga so that it drops down by 20 inches. This allows for the greenhouse to be built upon a stem wall (knee wall) foundation. A stem wall provides a solid base to build upon, raises the peak height by 20 inches, and is universally thought to add to the already beautiful aesthetics of the greenhouse.

Hoklartherm Product Details

Hoklartherm Time Lapse Assembly of Riga XL Greenhouse Side Walls

Hoklartherm Riga Greenhouse Corner Profile

Hoklartherm Riga Greenhouse Foundation Base Profile

Hoklartherm Riga Greenhouse Foundation Frame Corners

Hoklartherm Riga Greenhouse Lower Front Door Assembly

Hoklartherm Riga Greenhouse Upper Front Door Assembly

Hoklartherm Riga Greenhouse Rear Wall Window Assembly (1 of 2)

Hoklartherm Riga Greenhouse Rear Wall Window Assembly (2 of 2)

Hoklartherm Riga Greenhouse Roof Window Assembly (1 of 2)

Hoklartherm Riga Greenhouse Roof Window Assembly (2 of 2)

Hoklartherm greenhouse frame profiles

About Hoklartherm GmbH

Hoklartherm GmbH Corporate Overview (German)

Hoklartherm GmbH HeadquartersSince 1982, Hoklartherm GmbH has been designing, engineering, manufacturing, and distributing premium greenhouses and outdoor structures throughout the world. The company began as a maker of arched greenhouses and the unique Riga design has remained popular ever since. The company was founded by an engineering graduate named Werner Hollander who had built the first prototype in his family's garden a few years earlier.

From this first arched design has come a series of incremental changes to make the Rigas among the very strongest greenhouses available anywhere. The frames have been engineered for strength and to shed off snow and the commercial-grade polycarbonate panels add extra strength to the structure. Hoklartherm now makes beautiful and unique pavilions as well which have been widely installed throughout Europe in parks, commercial settings, and luxury private gardens.Hoklartherm GmbH Factory

At Hoklartherm's headquarters in Apen, Germany, a section referred to as "Greenhouse World" opened to the public in 2012 to showcase all of their unique designs in one place. At this site is the Hoklartherm state of the art factory that employs all the latest quality control techniques and aluminum processing equipment to ensure the very highest and most precise build quality. Hoklartherm is now Germany's largest manufacturer of premium residential and commercial greenhouses and its structures have been enjoyed by happy customers all over the world.

About Exaco Trading Co.

Exaco Trading Co.Exaco Trading Co. began in 1987 as importer and distributor of a home paint mixing accessory called the Exomixer. Since then the family owned company has expanded its line considerably to include many different home and garden products, including some of the very best greenhouses from Europe. The company is led by CEO Kimberly Tyson Cook, formerly an award winning business reporter for the Austin American-Statesman, and Andrew Cook, the VP of Sales and Marketing.

Andrew travels to Europe to check on the manufacturers in person several times a year and has become a leading national authority on all things greenhouse related. He has appeared in many gardening articles and television programs nationally. In fact Andrew is available for phone support for customers during the installation of any of the premier greenhouses that Exaco distributes from its large Austin, TX warehouse.

Assembly Tips For Hoklartherm Riga Greenhouses

While the process of assembling a greenhouse might seem daunting, these kits are designed to be assembled by people even with no prior building experience. Depending on your skill level, the size of the structure, and the number of options you order, putting together a kit can take two or three adults one full weekend.

Many customers opt to hire a local handyman or contractor to simplify this process, and the affordable price of the kits makes it easy to do this. They can be readily found online at sites like AngiesList or HomeAdvisor. A version of the assembly manual is available as a PDF near the bottom of this page to give you a better idea of the process.

Site Preparation - Customers often tell us that the trickiest part of the the process is making sure that they have a good foundation upon which to build the structure. This foundation should extend around the perimeter of your greenhouse. It is ideal to have the foundation be as level and square as possible.

Concrete pavers or pressure-treated wood with crushed stone is often used, though actually pouring concrete will give the most permanent installation. The greenhouse is designed to last for decades, and pressure-treated wood typically will fail well before that when used in outdoor applications, particularly in the ground.

Exaco recommends that all the grass and weeds be removed from inside the greenhouse before assembly and that the area be covered with a weed control mat. Installing the greenhouse on a concrete slab may seem like an easier way to get started, but it's actually less than ideal, as the greenhouse floor should be free draining.

Standing water on concrete can freeze easily in winter months, causing a slip hazard. And concrete slabs don't help regulate the temperature inside the greenhouse as well as other floors such as pea gravel, pine straw, riverbed stones, or just regular earth. Customers typically will create some sort of path down the middle of their greenhouse with flag stones, bricks, or even decking.

Manuals: Hoklartherm Riga XL Greenhouse Manual [2,219 k] 
Manuals: Hoklartherm Riga Greenhouse Warranty [115 k] 
Product Reviews
Be the first to review this product. Rate it now.