Riga 3s Greenhouse | 81 sq. ft. | Hoklartherm

What's Included Every Riga 3s 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 72" 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. Who This is For The Riga 3s is the sweet spot for most Front Range home gardeners. Enough space for serious growing, compact enough for a typical suburban yard, and built to last decades. Why Buy from South Table Sheds We're an authorized Exaco dealer based in Golden, Colorado, with 17 years of experience building 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 3s — Serious Growing in a Compact Footprint The Riga 3s is built for the Front Range gardener or any gardener who wants a genuine four-season greenhouse that fits a real suburban yard without dominating it. At 7'8" wide and 10'6" long, the Riga 3s slips into a side yard, a backyard corner, or alongside a fence without taking over the space. The footprint is compact enough to work on most Denver metro lots such as in Lakewood, Arvada, Littleton, and Golden where yards run standard sizes and still leaves room for the rest of your outdoor life. What you don't give up with the smaller footprint is quality. The same 8mm and 10mm twin-wall polycarbonate panels. The same 13-gauge anodized aluminum frame. The same German precision manufacturing. The same 15-year frame warranty. The Riga 3s is not a compromise, it's the full Riga engineering package in a space-conscious design. For most Colorado home gardeners, 81 square feet is exactly enough. Seed starting in late winter, growing tomatoes and peppers through summer, overwintering perennials and tender plants, the 3s handles all of it comfortably with room to spare. . 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 3s vs. Riga 3 — 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. If your yard has room for the wider footprint, the Riga 3 is the better long-term value. If space is the constraint, the Riga 3s delivers the same German engineering in a more compact footprint. Why the Riga 3s Outperforms Every Other Greenhouse in Its Class 8mm + 10mm Twin-Wall Polycarbonate — Not All Panels Are Equal The Riga 3s 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 3s 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, cross-ventilation is excellent even during Colorado's intense summer sun. Compact Footprint, Full Performance At 7'8" wide and 7'1" at the peak, the Riga 3s fits in yards where the wider Large series won't. The narrower profile doesn't compromise on panel quality, frame strength, or weather resistance, you get the same German engineering in a space-conscious design. 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 (+$1,049) 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 3s in a Backyard — What Fits Inside One of the most common questions we get before someone pulls the trigger on a 3s is: what can I actually fit in there? Here's a practical breakdown. Basic setup — two benches and a center aisle Run a 25" wide bottom shelf down each long wall. That gives you roughly 50 linear feet of bench space, enough for dozens of seedling trays in spring, a full herb and salad green operation in summer, and overwintering stations for perennials in fall. The center aisle stays clear for moving around and tending plants. Seed starting in late winter The 3s is excellent for seed starting. With grow lights mounted overhead and the optional top shelf running the full 10'4" length, you can run 8–10 standard 1020 seedling trays per shelf tier — enough to start a full kitchen garden plus extras for neighbors or a plant sale. Year-round vegetable growing Colorado's 300 days of sunshine make the Riga 3s genuinely productive year-round with minimal heating. Tomatoes, peppers, and basil thrive through summer. Kale, spinach, lettuce, and root vegetables grow through winter with just a small heater maintaining above-freezing temps overnight. Many Front Range gardeners report harvesting greens every week of the year from a Riga 3s. Overwintering tender plants The 3s is a popular choice for overwintering plants that can't survive a Colorado winter outside, citrus trees in containers, bougainvillea, fig trees, banana plants, and tender perennials. The twin-wall insulation keeps temperatures stable enough overnight that a small heater does the heavy lifting without running constantly. Adding the shelf system The optional top shelf (10" wide x 10'4" long) and bottom shelf (25" wide x 10'4" long) are purpose-built for the 3s and hang from the frame rather than the walls. This preserves structural integrity, keeps light penetration even, and adds significant usable growing surface without taking up floor space. Most serious growers add both shelves, it's one of the best value upgrades in the Riga lineup. The Riga S Series — Find Your Size The Riga 3s is the mid-size of the S series. All three models share the same 7'8" width and 7'1" peak height: Riga 2s — 54 sq. ft. (7'8" x 7') The most compact S series option, ideal for smaller yards and first-time greenhouse owners. $5,999 Riga 3s — 81 sq. ft. (7'8" x 10'6") — You are here. The sweet spot for most Front Range home gardeners. Riga 4s — 108 sq. ft. (7'8" x 14') — Maximum S series space, two roof vents, room to grow into. $7,399 Need more width? The Riga Large series steps up to 9'8" wide with a taller 7'7" peak height, starting at 102 sq. ft. 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 3s hold up in Colorado hailstorms? Better than most greenhouse kits on the market. The Riga 3s 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 3s? The Riga 3s 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 3s frame and panel system is engineered to handle the load. For maximum wind resistance, we recommend anchoring to a solid foundatio either a concrete pad or the optional aluminum foundation frame rather than placing it on unanchored soil. Is 81 square feet enough for a serious home gardener? Yes! With wall-mounted shelves and the optional suspended shelf system, 81 square feet supports two full growing benches, a dedicated potting area, and floor space for containers or a small raised bed. The key is thinking vertically — use the walls and the shelf system rather than just the floor. Most Colorado gardeners who start with a Riga 3s run it for years without feeling limited. Many tell us they were surprised how much productive growing space 81 square feet actually provides once it's organized well. Can I heat the Riga 3s 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. How does the Riga 3s fit in a typical Colorado suburban yard? The 7'8" width and 10'6" length give you a footprint smaller than most garden sheds. It fits comfortably in a side yard, a corner of a backyard, or alongside a fence without dominating the space. Most standard suburban lots across Lakewood, Arvada, Littleton, Golden, and the broader Denver metro have room for a Riga 3s without sacrificing usable yard space. If you're in an HOA, the compact footprint often falls within accessory structure guidelines that a larger greenhouse wouldn't — though always confirm with your specific HOA before ordering. Do I need a building permit in Colorado for a greenhouse this size? At 81 square feet, the Riga 3s typically falls well 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 many 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.