Holkartherm | Riga Black Greenhouse

Hoklartherm

Item:

Regular price
$9,349.00
Regular price
$10,999.00
Sale price
$9,349.00
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Estimated Arrival: Between Aug 19 and Sep 08.

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The Riga Black Greenhouse brings the proven strength of the German-made Riga line into a more refined, architectural profile. With its black powder-coated aluminum frame, elegant Victorian-style roof cresting, clear front panels, and insulated twin-wall polycarbonate body, it offers a strong balance of beauty, protection, and year-round growing performance.

This greenhouse is ideal for gardeners who want more than a basic backyard kit. The curved roof and sidewall design help shed snow and deflect wind, while the insulated polycarbonate glazing helps create a more stable growing environment through changing seasons. The clear plexiglass front adds visibility and a more open feeling at the entrance, giving the Riga Black a distinctive look compared to standard polycarbonate greenhouses.

Choose the Riga Black if you want a serious four-season greenhouse with German engineering, stronger insulation than glass, and a more polished visual presence than a typical utility greenhouse.

KEY FEATURES

German-made Hoklartherm construction: Designed and manufactured in Germany by the maker of the Riga greenhouse line.

Black powder-coated aluminum frame: 13-gauge aluminum extrusions provide strength, corrosion resistance, and a refined modern look.

Curved sidewall and roof profile: Rounded shape helps shed snow, deflect wind, and improve structural performance.

Insulated twin-wall polycarbonate: 8mm twin-wall polycarbonate side walls and 10mm twin-wall polycarbonate gable ends help improve insulation and durability.

Clear plexiglass front: Adds visibility, light, and a more open architectural appearance at the entrance.

2 roof vents with automatic openers: Roof windows open and close based on temperature to help release heat without constant manual adjustment.

Large rear wall window: Adds important cross-ventilation from the back of the greenhouse.

Barn-style Dutch door with lock: Split door improves access and airflow while the lock helps keep the greenhouse secure when not in use.

Victorian cast metal cresting: Decorative roof finials add a finished European greenhouse look.

DIMENSIONS/SPECIFICATIONS

The Riga Black is available in two sizes, Riga 4 Black and Riga 5 Black. Both models share the same 9ft 8in width, 7ft 7in peak height, black powder-coated aluminum frame, insulated polycarbonate glazing, barn-style door with lock, 2 roof vents with automatic openers, and 1 rear wall window.

Riga 4 Black - 14ft Length

FRAME

Frame Material: 13-gauge powder-coated aluminum extrusions
Frame Color: Black
Design: Curved sidewalls with Victorian cast metal roof cresting

DIMENSIONS

Width: 9ft 8in
Length: 14ft
Peak Height: 7ft 7in
Growing Area: 135 sq. ft.

GLAZING

Side Walls: 8mm twin-wall polycarbonate
Gable Ends: 10mm twin-wall polycarbonate
Front Panels: Clear plexiglass

Riga 5 Black - 17ft 6in Length

FRAME

Frame Material: 13-gauge powder-coated aluminum extrusions
Frame Color: Black
Design: Curved sidewalls with Victorian cast metal roof cresting

DIMENSIONS

Width: 9ft 8in
Length: 17ft 6in
Peak Height: 7ft 7in
Growing Area: 165 sq. ft.

GLAZING

Side Walls: 8mm twin-wall polycarbonate
Gable Ends: 10mm twin-wall polycarbonate
Front Panels: Clear plexiglass

WHAT'S INCLUDED
  • Black powder-coated aluminum frame
  • 8mm twin-wall polycarbonate side walls
  • 10mm twin-wall polycarbonate gable ends
  • Clear plexiglass front panels
  • Victorian cast metal roof cresting and finials
  • Barn-style hinged Dutch door with lock
  • Door size: 2ft 6in W x 6ft 7in H
  • 2 roof vents with automatic openers
  • Roof vent opening size: 22in x 40in
  • 1 rear wall window: 3ft 5in x 2ft 1in
MAINTENANCE AND CARE
  • Clean polycarbonate and plexiglass panels with mild soap, water, and a soft cloth.
  • Avoid abrasive pads, harsh chemicals, or pressure washing directly against panels and seals.
  • Keep roof vents, rear window, door hardware, and automatic openers free of debris.
  • Inspect the door lock, fasteners, anchors, and vent openers periodically.
  • Remove excessive snow accumulation if conditions exceed normal design expectations.
  • Maintain good airflow during warm weather to reduce heat buildup and plant stress.
OPTIONAL ACCESSORIES

Optional Riga-compatible accessories may include shelving, staging, shade cloth, foundation kits, extra ventilation components, and other growing accessories. Availability may vary by model and supplier.

For many buyers, the most important upgrades to consider are a proper foundation/base solution, shelving or staging for growing efficiency, and shading or ventilation accessories for warm climates.

Warranty
  • Polycarbonate: 15 Year Limited Warranty (prorated after 5 years)
  • Frame: 15 Year Limited Warranty

MANUFACTURER INFO AND UNIQUE SELLING POSITION

The Riga Black is manufactured by Hoklartherm in Germany and distributed by Exaco in the United States. Hoklartherm has been manufacturing high-quality greenhouses in Germany for over 40 years, and the Riga line is known for its curved profile, insulated polycarbonate construction, and strong four-season performance.

What makes the Riga Black stand out is its combination of practical greenhouse performance and refined European styling. It keeps the strength and insulation of the standard Riga line, then adds a black powder-coated frame, clear plexiglass front, and decorative Victorian cresting. For growers who want a serious polycarbonate greenhouse that also looks polished in the landscape, Riga Black is a distinctive choice.

FREQUENTLY ASKED QUESTIONS
Where is the Riga Black greenhouse made?

The Riga greenhouse line is made by Hoklartherm in Apen, Germany. Hoklartherm has manufactured high-quality greenhouses in Germany for over 40 years. 

What is the difference between Riga Black and the standard Riga greenhouse?

Riga Black uses the same strength and insulation concept as the standard Riga line, but adds a black powder-coated frame, clear plexiglass front, and Victorian cast metal roof cresting for a more refined appearance.

What glazing does Riga Black use?

Riga Black uses 8mm twin-wall polycarbonate side walls, 10mm twin-wall polycarbonate gable ends, and a clear plexiglass front.

Does the Riga Black include automatic vent openers?

Yes. Riga Black includes 2 roof vents with automatic openers, along with 1 large rear wall window for additional ventilation.

Do I need a permit for this greenhouse?

Permit requirements vary by local municipality. Customers should check local rules before ordering, especially if the greenhouse size, location, foundation, or local wind and snow requirements may affect approval.

What foundation is recommended?

The site must be level and the greenhouse must be securely anchored. Exaco notes that customers may use a concrete strip foundation, a compatible foundation/base frame kit, or in some cases a full concrete slab with proper drainage planning.


Why This Greenhouse Is Worth Buying From Us

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