Riga 4s 7x14 Greenhouse

Riga 4s (Riga IVs) 7x14 Greenhouse

The Riga 4s is the narrow-width 14-foot model in the Riga series — 108 sq ft of growing area in the compact 7'8" wide footprint of the IIs/IIIs series, extended to 14 feet in length. It includes two automatic roof openers for superior ventilation across the longer interior. Designed, engineered, and manufactured in Germany by KGT/Hoklartherm with 28 years of experience, the Riga 4s is built for serious year-round growing in gardens where the wider 9'8" Riga 4 won’t fit.

What’s Included — Basic Package

• 8mm UV-coated translucent twin-wall polycarbonate panels — sides and roof
• 10mm translucent twin-wall polycarbonate panels — front and rear gables (added strength)
• 2 roof windows (40" W × 24" D each) with automatic openers
• 1 oversized rear wall window (30" W × 42" H) with adjustment arm
• Heavy-duty Dutch barn-style door with keyed lock (30" W × 72" H)
• First-class insulation — R/K-value up to 1.89
• 15-year warranty on aluminum frame
• 10-year pro-rated warranty on polycarbonate panels

Riga IVs vs. Riga IV — Narrow vs. Wide 14-Foot Models

Both models are 14 feet long with 2 automatic roof openers. The Riga IV is 2 feet wider and 6 inches taller, adding 27 sq ft of growing area. If your site can accommodate the extra width, the Riga IV is the better long-term investment. Choose the Riga IVs for narrow lots where the 9'8" width won’t fit.

Riga Series Comparison

Frequently Asked Questions

What is the difference between the Riga 4s and the Riga 4?
Both models are 14 feet long with 2 automatic roof openers. The Riga 4s is 7'8" wide × 7'1" tall (108 sq ft); the Riga IV is 9'8" wide × 7'7" tall (135 sq ft). The Riga 4s is the right choice for narrow lots where the wider Riga 4 won’t fit. If width is not a constraint, the Riga 4 offers 27 more sq ft of growing area and 6 more inches of peak height for approximately $630 more.

Why does the Riga 4s have two roof windows?
The 14-foot length requires two roof windows to provide adequate ventilation across the full interior. A single roof window would leave the far end of the greenhouse with insufficient airflow on hot days. The two automatic openers work independently, allowing the greenhouse to self-regulate temperature along its full length.

Do I need the base kit (foundation frame)?
The base kit is strongly recommended for soil or lawn installations. The Riga 4s base kit is a 6" H × 92" W × 168" D aluminum frame buried in a trench and backfilled with soil to anchor the greenhouse and raise the interior height by 6". Without a proper foundation, the greenhouse may shift over time. 

Can the Riga 4s handle heavy snow loads?
Yes — the “onion” arch profile sheds snow automatically. The Riga 4s has been tested against winds up to 100 mph and has never been blown away when properly anchored.

How long does assembly take?
Assembly takes approximately one full day for two people. Written instructions are included. The Riga assembly facilitation kit (metric tape, 10mm wrenches, ratchet straps, Boss 399 silicone caulk, window restraint cables) is available separately.

Is the Riga 4s expandable?
No — the Riga 4s is a fixed-length model. If you anticipate needing more space in the future, consider the Riga XL series, which is designed to be expandable by adding additional sections.