Spacious Backyard Kits, 10 ft Wide
Mon–Fri 9am–5pm EST or Send a Message
Get this sizing guide with photos and bed layouts.
Get the free guide
| L, (in) | W, (in) | H, (in) | Weight, (lbs) | Quantity | |
| Sigma Base 1 | 80 | 11 | 4 | 93 | 1 |
| Sigma Base 2 | 78 | 24 | 3 | 93 | 1 |
| Sigma Polycarbonate Base | 82 | 44 | 4 | 58 | 1 |
| Sigma Polycarbonate Extension | 82 | 44 | 2 | 31 | 1 |
| Total weight: | 275 |
| L, (in) | W, (in) | H, (in) | Weight, (lbs) | Quantity | |
| Sigma Base 1 | 80 | 11 | 4 | 93 | 1 |
| Sigma Base 2 | 78 | 24 | 3 | 93 | 1 |
| Sigma Polycarbonate Base | 82 | 44 | 4 | 58 | 1 |
| Sigma Extension | 78 | 21 | 3 | 63 | 1 |
| Sigma Polycarbonate Extension | 82 | 44 | 2 | 31 | 2 |
| Total weight: | 285 |
| L, (in) | W, (in) | H, (in) | Weight, (lbs) | Quantity | |
| Sigma Base 1 | 80 | 11 | 4 | 93 | 1 |
| Sigma Base 2 | 78 | 24 | 3 | 93 | 1 |
| Sigma Polycarbonate Base | 82 | 44 | 4 | 58 | 1 |
| Sigma Extension | 78 | 21 | 3 | 63 | 2 |
| Sigma Polycarbonate Extension | 82 | 44 | 2 | 31 | 3 |
| Total weight: | 463 |
| L, (in) | W, (in) | H, (in) | Weight, (lbs) | Quantity | |
| Sigma Base 1 | 80 | 11 | 4 | 93 | 1 |
| Sigma Base 2 | 78 | 24 | 3 | 93 | 1 |
| Sigma Polycarbonate Base | 82 | 44 | 4 | 58 | 1 |
| Sigma Extension | 78 | 21 | 3 | 63 | 3 |
| Sigma Polycarbonate Extension | 82 | 44 | 2 | 31 | 4 |
| Total weight: | 557 |
Greenhouses are amazing products, and they require special shipping and handling. That is the reason, we have been working diligently over the past year to secure preferential shipping rates for our customers. Most shipments across Canada and the US are between $250 and $450.
Sigma Urban (Gen II) · 10′ × 13′
Sigma 20 (Gen II) · 10′ × 20′
Sigma 26 (Gen II) · 10′ × 26′
Sigma 32 (Gen II) · 10′ × 32′
Sigma Gen II greenhouse has a dome-shaped arch which sheds snow and rain, and the galvanized pipe frame with 6 mm twin-wall panels is rated for 32 psf of snow.
Heavy-duty greenhouses used by 25,000+ growers since 2019, designed to withstand heavy winters. Backed by a 5-year warranty and live customer support.
Ships across Canada, and most residential orders ship for $250–$450 depending on your location. Every panel is pre-cut and every bag of hardware is labeled, so two people can build it with the step-by-step videos.
Mon–Fri 9am–5pm EST or Send a Message
Just finished assembly on my sigma 26 and it was pretty straight forward. I highly recommend watching the YouTube installation videos. The little details matter so pay close attention and take notes. I highly recommend installing the extra perlins for the roof vents before you install the poly sheets and make sure you keep all the hardware and screws organized. Overall very happy with my purchase.
Thank you so much, Marc! We're absolutely thrilled to hear that your Sigma 26 assembly went so smoothly and that you're happy with your purchase! Your advice about watching the YouTube installation videos is spot-on - those little details really do make all the difference, and we're glad you found them helpful for getting everything just right.
What excellent tips you've shared about installing those extra purlins for the roof vents before the poly sheets go on, and keeping all the hardware organized - that kind of thoughtful preparation is exactly what leads to a successful build! Your attention to detail clearly paid off, and we're sure other Sigma 26 owners will find your insights incredibly valuable.
Thank you for choosing Planta and for sharing such helpful feedback about your assembly experience!
This is the first “real” greenhouse kit that I’ve ever owned. I was mostly able to assemble and install it by myself but there are certainly points where you need another set of hands. So far it has survived its first Ohio winter without major problems. A few thoughts:
1) the part labeling is pretty bad (the stickers fall off or don’t match what the book says), I spent a lot of time figuring out what part is what. Sometimes I assembled parts backwards so that was pretty frustrating
2) the poly panels ended up being a little wider than the greenhouse frame. This meant that I really struggled to maintain the “module spacing” to be able to properly secure the poly to the framework. You may have to rip a panel to width like I did
3) don’t skimp on anchoring your foundation into the dirt. If you live on a windy ridge top like I do you’ll want that peace of mind. I used two layers of 2x6 to make my foundation.
4) the roof vent kit is troubled. I wouldn’t put more than two in your greenhouse unless you want it to leak a lot. The chain is weak and I wish it would’ve just come with a poly panel instead of cutting one to size. The latch is my biggest issue, it is nowhere near substantial enough. But they do work and with the help of a bungee cord they’ve been holding on through Snow, ice and 40mph gusts.
5) I’m glad to hear that they upgraded the door handles and trim work. The version I have is pretty lackluster but it works okay. I used caulk, foam, tape and other gap filling…
Thank you for taking the time to share such a detailed and thoughtful review of your Sigma 20 (Gen II). We really appreciate you highlighting both the positives and areas for improvement, as this kind of feedback is incredibly valuable.
It’s great to hear that your greenhouse made it through its first Ohio winter and that you’re already seeing the benefits in temperature control and usability. That’s exactly what these structures are designed for, so it’s rewarding to hear it’s delivering on that promise.
We also appreciate your honest notes on assembly, part labeling, and panel fitment. We understand how frustrating that can be, especially on a first build, and your feedback is something we continue to share with our product team as we work on improving instructions, labeling, and overall installation experience.
Thank you as well for your detailed comments on the roof vents and hardware. Many customers choose to reinforce or customize certain elements based on their climate, especially in high-wind areas like yours, and your insight will be very helpful to others planning similar setups.
We’re glad to hear our customer support team was able to assist you along the way and that you found the final result worth the effort. That is something we always strive for.
We highly recommend joining our Facebook Community if you haven't already. It is a wonderful platform for novices to experienced Planta Greenhouse owners to share information. We have over 5000 members who share their ideas, DIYs, pictures, and real-world setups.
https://www.facebook.com/groups/plantagreenhousescommunity
Wishing you many successful growing seasons ahead!
We love our sigma greenhouse, it has kept our garden going during this winter. We installed a wood stove inside it! and the pipe did not destroy the poli! We are super happy with this greenhouse, we are planning on expanding it or buying a bigger one. I highly recommend this greenhouse, money very well invested! We live in Idaho for reference.
Thank you so much, Diana! We're thrilled to hear how well your Sigma 32 is performing through the Idaho winter. It's fantastic that you were able to install a wood stove and that the poly held up beautifully. Your experience keeping the garden going through winter is incredibly valuable feedback and will be so helpful for other growers in similar climates.
Thank you for the wonderful recommendation and for sharing how well your investment has paid off. Here's to many more successful growing seasons ahead!
The Booklet Instructions do not match the sequence of the video instructions which required rework.
I had lots of problems getting the end panel polycarbonate panels to line up properly, partly because the screw holes were correctly drilled on the bottom of the frame. The polycarbonate end panels should be installed after the doors and windows are installed.
The booklet instructions has you install the doubled-sided tape to the end of the polycarbonate panels, but the video shows installing the tape to the profile which works lot better. It should be only installed to one side of the profile which make installing much easier.
I could not get the panels on one end to line up correctly with the profile. I fought with it several hours, but it would not line up correctly. The one end fell right in place. I should have started from that end first.
The greenhouse is built very strong.
Hi Carl,
Thank you for taking the time to share your detailed feedback and for the 4-star review! We really appreciate you highlighting both the challenges you faced and the positive aspects of your Sigma Urban.
We understand how frustrating it can be when instructions don't align perfectly, and we're sorry the booklet and video sequences caused confusion and extra work during your build. Your insights about the double-sided tape application and the order of installing end panels versus doors and windows are incredibly valuable — we'll definitely pass these along to our product team for future improvements.
It sounds like you discovered some helpful techniques along the way, especially regarding the tape placement on the profile rather than the panels. These kinds of real-world insights from experienced builders like yourself help us improve the process for future customers.
We're glad to hear that despite the assembly challenges, you found the greenhouse to be built very sturdily. That's precisely what we aim for with our structures.
Thanks again for your patience during the build and for sharing your experience!
Located in mid upper Michigan, where the snow and wind can be a factor. The Sigma 20 is perfect for creating a controlled growing environment.
Think of it as a big Erector Set. It goes together easily. Just follow the instructions and you can't miss.
The staff from Planta were extremely helpful in coordinating shipping, etc. Give yourself a raise!
Thanks so much, John! We're thrilled to hear the Sigma 20 is working perfectly for your Michigan growing setup—those snowy, windy conditions are no joke! We'll definitely pass along your kind words to our team—they'll be excited to hear how helpful they were with your shipping coordination. Here's to many successful growing seasons ahead!
