Clear Sigma 200 (Gen III) greenhouse with open door in a garden setting - by Planta Greenhouses EU.
Arch-shaped Sigma 2x4 (Gen III) greenhouse in a garden with flowers and a stone path by Planta Greenhouses EU.
Sigma 200 (Gen III) greenhouse with transparent panels on a grassy area in front of a house.
Small Sigma 2x4 (Gen III) greenhouse on a garden with a house in the background
Partial view of a Sigma 200 (Gen III) greenhouse with a sliding door
Interior of a Sigma 200 (Gen III) greenhouse with shelves and a ladder.
Metal Sigma 200 (Gen III) greenhouse structure with curved roof and transparent panels on a concrete floor.
Sigma 200 (Gen III) Greenhouse interior with soil floor and glass walls, outside view of grassy field.
Interior of a Sigma 20 (Gen III) greenhouse with transparent walls and a door.
Partial view of a Sigma 200 (Gen III) greenhouse with transparent panels and metal frame.
Clear polycarbonate Sigma 200 (Gen III) greenhouse structure with metal frame in a warehouse setting
Metallic door with a handle and key lock on a Sigma 200 (Gen III) greenhouse door.
Modern Sigma 200 (Gen III) greenhouse with transparent walls and a curved roof in a garden setting - by Planta Greenhouses EU.
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Sigma Small Urban (Gen III)

Sigma Small Urban (Gen III)

Approx Size: 6.5' × 13' × 8'

Transform your backyard into a vibrant garden that continues to flourish in the face of sizzling summers and frosty winters. A space where you can explore your green thumb by experimenting with a variety of zesty fruits and spicy peppers throughout the seasons. A tranquil retreat where you can spend time marveling at how your plants grow.

Features

Strong and spacious: long-lasting construction, weather-resistant materials, and roomy design.

  • Insulated Doors [NEW] – Helps reduce heat loss and drafts, creating a more stable growing environment and improving energy efficiency.
  • Upgraded Door Handles [NEW] – Smooth, reliable operation with a sturdy grip for easier daily access and long-term durability.
  • Aluminum Polycarbonate Trim [NEW] – Securely locks panels in place along the arch for added strength, better weather resistance, and a clean, finished look.
  • Window/Door Latch [NEW] - Makes the door and window open together.
  • Improved Snow Load [NEW] - Withstands a snow load of up to 55 psf (265 kg/m²) or up to 4.5' feet
  • Wind resistant up to 65 mph for those living in gusty climates.
  • Comes with two doors (one at each end).
  • Made with a heavy-duty galvanized pipe frame and 6 mm double-wall polycarbonate panels.
  • Arched shape - so the wind, snow, and hail just slide off the sides.
  • Extendable beyond 100 ft - so you can expand your greenhouse when you're ready.
  • Maintenance-free means you have more time to focus on your garden.
  • We offer a 5-year warranty because our greenhouse is heavy-duty and long-lasting.
  • Access to our private Facebook group to connect with and learn from other greenhouse owners.
$2,650 USD
$2,850 USD Save $200 Sale $2,650 USD
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Description Reviews Shipping FAQ

About Sigma Small Urban (Gen III)

The Planta Sigma Small Urban (Gen III) was created for spirited gardeners working with compact urban and suburban spaces. This greenhouse is ideal for 3 or 4 season gardening, so you can harvest homegrown fruits and vegetables throughout the year. Our Sigma collection focuses on sturdy construction and spacious design, bringing heavy-duty greenhouse engineering right to your backyard.

Exact size: 78.7 x 94.5 x 158.3 inches

The tough galvanized pipe frame is rust-resistant and built to last. It's strong enough to handle moderate to severe weather conditions, keeping your garden protected throughout the seasons.
The greenhouse comes with:
  • two doors
  • two manual windows
  • the option to install multiple windows.

This greenhouse is particularly comfortable to work in throughout the day due to the end-to-end ventilation and the unique 7.8' (2.4m) roof height.

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Snow Load Up To 55 psf (265 kg/m²)

55 psf (265 kg/m²) and is maintenance-free in the winter

More About PSF

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Wind Resistant up to 65 mph (100 km/h)
Sturdy greenhouse construction that resists winds up to 65 mph (100 km/h)
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Extendable & Customizable
This greenhouse can be extended with additional expansion kits
 
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1 review
  • MH
    Michel H.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 weeks ago
    Serre Sigma Small Urban (Gen III) à Rimouski

    La serre Sigma Small Urban (Gen III), assemblée sans réelle difficulté avec le manuel d'installation en anglais seulement, est installée chez moi depuis la mi-mai 2026. La serre est sur des pièces de bois traité 15cm x 15cm de niveau et sur des blocs de pierre recyclés pour donner plus de hauteur. Le plancher est aussi sur blocs de pierre recyclés. Le plancher et autres éléments de béton à l'intérieur et un gros baril rempli d'eau permettent d'accumuler de la chaleur le jour pour la restituer la nuit avec te temps plus frais.

    La serre est très solide et a belle allure. Elle répond à mes besoins avec une porte et une fenêtre à chaque extrémité permettant une bonne ventilation naturelle. Les tomates et concombres de serre en pots sont bien partis et vont produire à partir de la mi-juillet. L'espace ne manque pas et l'air circule bien. J'ai aussi installé quatre ancrages permanents pour plus de confiance en cas de grands vents. L'utilisation de la serre sera plus intense à compter de l'an prochain.

    Was this helpful?
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    Planta Greenhouses
    1 week ago

    Merci beaucoup d'avoir partagé votre expérience avec votre serre Sigma Small Urban (Gen III).

    Nous sommes heureux d'apprendre que l'installation s'est bien déroulée et que la serre répond à vos besoins. Votre aménagement pour emmagasiner la chaleur et votre ajout d'ancrages permanents sont d'excellentes idées pour optimiser les performances de la serre dans le climat de Rimouski.

    Nous vous souhaitons une belle saison de culture et de nombreuses récoltes dans les années à venir. Merci d'avoir choisi Planta Greenhouses!

Shipping

Sigma Small 20 (Gen III) ships in these boxes:

  L, (in) W, (in) H, (in) Weight, (lbs) Quantity
Sigma Base 90 42 3 57 1
Sigma Greenhouse Frame 1 79 23 4 93 1
Sigma Greenhouse Frame 2 90 14 4 84 1
Total weight: 234

 

Planta Greenhouses is dedicated to deliver your order promptly, so you can begin using your greenhouse products right away.

Because greenhouses are packaged in large boxes, they have unique shipping requirements, including: 

  • We will contact you to confirm shipping price, based on your location and order size.
  • Shipping on most orders is between $250 and $450. Deliveries to remote areas may cost extra.
  • When you place your order, please make sure to enter the correct Phone and Address at checkout. You will be contacted by phone before the item is shipped. We cannot be responsible for deliveries to incorrect addresses.
  • As part of the delivery process, we require a contactable telephone number (for the courier company to contact you) before the item is shipped.
  • We will make every effort to ship your order in the fastest possible manner, and by the mode of transportation that you specify; however, in the event of no specific instructions, we will use our judgment and ship the best, fastest and most economical way. We are not responsible for delayed delivery due to conditions beyond our control.
  • We do not ship to PO Boxes, as in most cases you will need to sign for your item. 
  • White glove delivery service isn't available. The greenhouse components are delivered in multiple boxes, the largest of which weighs 80lbs. The greenhouse will be delivered to your driveway. Please make arrangements to have the package moved to its installation location. 
  • Orders placed on weekends and public holidays will be processed the next business day.

FAQ

Residential Greenhouses

Are there doors on both ends of the greenhouse?

Yes! All of our Sungrow models come with manual doors and a manual window above the door on both ends of the greenhouse.

Do you have lean-to greenhouses?

Unfortunately, we do not have any lean-to greenhouses available at this time.

Do you make custom size greenhouses?

All of our products come pre-packaged by the manufacturer and can only be customized in length (6.5' extension). However, the height of the greenhouse can also be increased if placed on a base (up to 5ft above the ground)

How is the greenhouse anchored to the ground?

Every greenhouse kit comes with optional legs that can be dug directly into the ground. The amount of legs included depends on the greenhouse size.

What is the frame made of?

The greenhouse frame is made out of heavy-duty galvanized steel.

What polycarbonate panels are used for residential greenhouses?

We use 6mm heavy-duty, double-walled polycarbonate panels with a UV-protected outside layer for our Residential Greenhouses.

What type of base/foundation is the best for me?

There are several different types of greenhouse bases, information, and pictures posted by our customers on our Customer Stories page and our Planta Facebook page. Additionally, you can learn more about "Types of Greenhouse Bases - With Pros & Cons of Each" on our blog.

Sigma Greenhouses

What are the snow load and wind resistance on the Sigma models?

Sigma models (Gen II) can hold a snow load weight of 32 psf (160 kg / m2) or 3ft of fresh snow on top of the greenhouse. Sigma models (Gen III) can hold a snow load weight of 55 psf (265 kg / m2). The wind resistance is 65 mp/h (100km/h).