Riga 3 Greenhouse | 102 sq. ft.| Hoklartherm

What's Included Every Riga 3 ships as a complete kit: All polycarbonate panels (8mm sides, 10mm gable ends) Complete aluminum frame with all extrusions and connectors Barn-style hinged door with key lock (30" W x 79" H) 1 roof ventilation window with automatic opener 1 large rear wall window Heavy-duty rubber seals throughout All hardware and fasteners Detailed assembly guide Ships in 3 boxes. Free curbside delivery to the lower 48. The carrier will call to schedule your delivery appointment. Why Buy from South Table Sheds We're an authorized Exaco dealer based in Golden, Colorado, with 17 years of experience assembling and selling outdoor structures. When you buy from us, you're not just dealing with an online store, you're working with people who've assembled these greenhouses, know how they perform through Colorado winters, and are available to answer real questions before and after your purchase. Free shipping to the continental US Secure checkout with Shop Pay installments available Authorized Exaco retailer, purchase fully protected Professional assembly available across the Denver metro Call us directly: 720-656-7313 The Riga 3 — Durable, Long-Term The Riga 3 polycarbonate greenhouse kit is designed for gardeners who want a durable, long-term greenhouse built for challenging climates. With insulated 10mm twin-wall polycarbonate panels, a reinforced aluminum frame, and excellent snow and hail resistance, the Exaco Riga 3 greenhouse performs far better than many lightweight seasonal greenhouse kits. The Riga 3 offers 102 square feet of growing space for raised beds, shelving, seed starting, and year-round gardening while still fitting comfortably in most backyards. Popular with Colorado gardeners and growers in harsh weather climates, this greenhouse is built for serious growing and long-term durability. This is the greenhouse most home gardeners end up wishing they'd started with. Denver Area? Add Professional Assembly South Table Sheds has been building and assembling outdoor structures across Colorado since 2008. If you'd rather spend your time growing than reading instruction manuals, we'll handle the entire assembly from site prep through final inspection. Get a free assembly quote → Assembly available throughout the Denver metro, Golden, Boulder, Lakewood, Arvada, Littleton, Centennial, Aurora, and surrounding Front Range communities. Riga 3 vs. Riga 3s — What's the Difference? This is the most common question we get about the Riga line. Both are 10'6" long and built with the same German engineering. The difference is width and height: Riga 3s Riga 3 Width 7'8" 9'8" Length 10'6" 10'6" Peak Height 7'1" 7'7" Growing Area 81 sq. ft. 102 sq. ft. Door Height 72" 79" Side Wall Glazing 8mm twin-wall 8mm twin-wall Gable End Glazing 10mm twin-wall 10mm twin-wall Price $6,599 $6,899 The Riga 3 costs $300 more and gives you 21 additional square feet, a wider interior, and a taller door. For most gardeners with the yard space, the 3 is the better long-term investment. Why the Riga 3 Outperforms Every Other Greenhouse in Its Class 8mm + 10mm Twin-Wall Polycarbonate — Not All Panels Are Equal The Riga 3 uses 8mm twin-wall polycarbonate on the side walls and 10mm panels on the gable ends. Most competing greenhouses use uniform 4–6mm single-wall panels throughout. The difference in heat retention, hail resistance, and UV protection is significant, especially at Colorado's elevation where UV intensity is considerably higher than at sea level. Aerodynamic Curved Roof — Engineered for Snow Country The distinctive bell-shaped curved roof isn't just a design choice, it's engineering. Snow slides off rather than accumulating into dangerous loads. Wind rolls over rather than pushing against flat surfaces. This matters everywhere, but especially on the Front Range where March can deliver 2 feet of wet spring snow overnight. Automatic Roof Ventilation — No Babysitting Required The Riga 3 includes one automatic roof vent opener that responds to temperature, not a timer or app. No electricity required. Combined with the large rear wall window and the Dutch barn-style door with its 79" clearance, cross-ventilation is excellent even during Colorado's intense summer sun. Taller Dutch Door — A Real Quality-of-Life Upgrade The Riga 3's door stands 79" tall, which is seven inches taller than the S series door. If you've ever had to duck slightly when entering a greenhouse, you'll appreciate this immediately. It also means moving larger plants in and out without the awkward maneuvering. 13-Gauge Aluminum Frame — Built to Last Decades Every extrusion is substantial anodized aluminum, not the thin-wall tubing found in budget structures. Hoklartherm backs the frame with a 15-year warranty. The polycarbonate panels carry a 10-year warranty against UV degradation. This is the kind of structure you're still using when your kids are grown. Precision German Manufacturing Hoklartherm has been building greenhouses in Germany for over 30 years. Every hole lines up. Every panel fits. Every connector seats properly. The unique channel design of the aluminum components allows for simple slide-and-fit assembly, saving time and reducing the frustration common with lesser-made kits. Optional Add-Ons Foundation Frame (+$1,299) The aluminum foundation frame provides a level perimeter base when mounting to a prepared surface. Buries in a shallow trench around the perimeter for a solid, level anchor. Strongly recommended for Colorado's freeze-thaw soil conditions. Shelf System Purpose-built shelving that hangs from the frame rather than the walls, preserving floor space and light penetration: Top Shelf — 10" wide x 10'4" long (+$379) Bottom Shelf — 25" wide x 10'4" long (+$499) The suspended shelf system is one of the Riga's most distinctive features. It adds usable growing space without compromising structural integrity or blocking light. The Riga Large Series — Find Your Size The Riga 3 is the entry point of the Large series. All three models share the same 9'8" width and 7'7" peak height: Riga 3 — 102 sq. ft. (9'8" x 10'6") — You are here. Perfect balance of space and footprint. Riga 4 — 135 sq. ft. (9'8" x 14') — Two automatic roof vents, more growing room, upgraded door handle Riga 5 — 165 sq. ft. (9'8" x 17'6') — Four automatic roof vents, maximum Large series growing space Looking for a narrower footprint? The Riga S series starts at 54 sq. ft. with a 7'8" width, from $5,999. Need a professional-grade structure? The Riga XL 6 steps up to 14' wide with 16mm triple-wall glazing. Frequently Asked Questions How does the Riga 3 hold up in Colorado hailstorms? Better than most greenhouse kits on the market. The Riga 3 uses 10mm twin-wall polycarbonate on the gable ends and 8mm twin-wall on the side walls, both significantly thicker than the 4–6mm single-wall panels found on budget greenhouses. The twin-wall construction absorbs impact rather than shattering, and the polycarbonate itself is far more impact-resistant than glass. Colorado's Front Range sees some of the most intense hail in the country, and the Riga's panel thickness and curved roof profile, which deflects rather than catches impact, makes it one of the better-suited greenhouse kits for our climate. How wind-resistant is the Riga 3? The Riga 3's aerodynamic bell-shaped curved roof is specifically engineered to perform in high-wind conditions. Rather than presenting flat surfaces for wind to push against, the curved profile redirects airflow up and over the structure. Customers in high-wind regions, including the Sierra Nevada, coastal New England, and the Great Plains, regularly report the Riga holding up through extreme wind events. On Colorado's Front Range, where chinook winds can gust well above 60 mph along the foothills, the Riga 3's frame and panel system is engineered to handle the load. For maximum wind resistance, we recommend anchoring to a solid foundation, either a concrete pad or the optional aluminum foundation frame, rather than placing it on unanchored soil. How does the Riga 3 compare to Tractor Supply or Amazon greenhouse options? The Riga 3 is a fundamentally different category of product. Big-box and marketplace greenhouse options typically use 4mm single-wall panels, thin aluminum tubing, and hardware designed to hit a price point. The Riga 3 uses 8–10mm twin-wall polycarbonate, 13-gauge anodized aluminum, and German precision manufacturing with a 15-year frame warranty. One is a seasonal shelter. The other is permanent growing infrastructure. Can I heat the Riga 3 for winter growing in Colorado? Yes! And the twin-wall panels make heating efficient. The insulating air gap in the polycarbonate panels makes a measurable difference in heating costs. Many Colorado growers use a small electric or propane heater to maintain above-freezing temperatures even during our coldest nights. At elevation, this insulation advantage is especially valuable. What foundation does the Riga 3 need? Three solid options: a concrete pad for maximum permanence, a level bed of compacted gravel or pavers for drainage and accessibility, or the optional aluminum foundation frame directly in soil. The frame option is the most DIY-friendly and works well in most yard conditions across Colorado's clay-heavy soils. Do I need a building permit in Colorado for a greenhouse this size? At 102 square feet, the Riga 3 typically falls within permit exemption thresholds for most Front Range municipalities, but rules vary by city and HOA. Jefferson County, Arapahoe County, Denver, and surrounding cities each have their own thresholds. We've navigated these requirements for 17 years. If you're unsure what applies to your property, ask us before you order. For a full overview, see our guide on Colorado building permits for sheds, greenhouses, and saunas. Does South Table Sheds offer greenhouse assembly services? Yes. Phil and our crew offer professional greenhouse assembly throughout the Denver metro and Front Range. Contact us for a quote. We're typically booked 2–4 weeks out during peak season, so reach out early. What's the difference between this and the Riga 3s? The Riga 3s is 7'8" wide with a 72" door. The Riga 3 is 9'8" wide with a 79" door. Same length, same glazing specs, but the Riga 3 gives you 21 more square feet, wider interior space, better headroom, and a taller door for $300 more. If your yard has room for the wider footprint, the Riga 3 is the better long-term value. Why Buy from South Table Sheds We're an authorized Exaco dealer based in Golden, Colorado, with 17 years of experience assembling and selling outdoor structures. When you buy from us, you're not just dealing with an online store, you're working with people who've assembled these greenhouses, know how they perform through Colorado winters, and are available to answer real questions before and after your purchase. Free shipping to the continental US Secure checkout with Shop Pay installments available Authorized Exaco retailer, purchase fully protected Professional assembly available across the Denver metro Call us directly: 720-656-7313