Sigma Small Greenhouse

Compact Backyard Kits, 6.5 ft Wide

4.7 · 90 reviews
Save $200
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.

Sigma Small Urban

Sigma Small greenhouse kits are arched backyard greenhouses rated for 4.5 ft (55 psf) of snow and 65 mph wind, with 6 mm twin-wall polycarbonate panels and a 10-year warranty. They're for sale in 5 sizes, all 6.5 ft wide, so you can choose the length that fits your space. Find your greenhouse.

Size: Sigma Small Urban · 6.5′ × 13′Size guide
$3,050$3,250Save $200

Free shippingTo nearest terminal
10-year warrantyFrame & panels
Pre-cut panelsFor easier installation
Guided assemblyVideos and live chat
Questions? Talk to a grower.

Mon–Fri 9am–5pm EST or Send a Message

Call us1-877-669-1286

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Our team will reply within one business day.

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Which size is best for your garden?

Get this sizing guide with photos and bed layouts.

Get the free guide
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  • 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] - Rated for a snow load of up to 55 psf (about 4.5 ft of snow).
  • 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 steel frame and 6 mm twin-wall polycarbonate panels.
  • Arched shape - helps wind, snow and hail 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 10-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.
  • The Sigma Small Greenhouse is available in 5 size configurations. Plus, you may purchase an extension kit, to extend the length of the greenhouse.
  • Extendable & Customizable
  • Snow Load Up To 55 psf 
  • Wind Resistant up to 65 mph
  • We offer a 10-year warranty because our greenhouse is heavy-duty and long-lasting.

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. 

  • We offer Free shipping to nearest terminal in USA. Shipping to the house is quoted on the checkout page. 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 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 84lbs. 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.

 

Free guide

The Beginner's Guide for Greenhouse Owners

Tell us where to send it and it's yours.

Compare Sigma Small Greenhouse Sizes

This greenhouse comes in several size configurations. Every greenhouse extends in 6.5 ft sections, so pick the length that fits your plot and your plans.
Arch-shaped Sigma 2x4 (Gen III) greenhouse in a garden with flowers and a stone path by Planta Greenhouses EU. Sigma Small Compact
6.5′ × 6.5′
Clear Sigma 200 (Gen III) greenhouse with open door in a garden setting - by Planta Greenhouses EU. Sigma Small Urban
6.5′ × 13′
Sigma 200 (Gen III) greenhouse with transparent panels on a grassy area in front of a house. Sigma Small 20
6.5′ × 20′
Sigma 2x8 (Gen III) greenhouse with a curved glass roof and walls on a grassy area. Sigma Small 26
6.5′ × 26′
Sigma Small Greenhouse Sigma Small 32
6.5′ × 32′
Price
Sale$2,500
$2,400
Sale$3,250
$3,050
Sale$4,100
$3,800
Sale$4,950
$4,550
Sale$5,800
$5,300
About
Starter size: shelves or a bed on one side for greens, herbs and seedlings.
A bed along one side and shelving on the other for seedlings and herbs.
Room for a long bed, a few tomato plants and a potting shelf.
Long beds for greens and tall crops, with a narrow center path.
The largest Sigma Small: a long growing space for beds, shelving and climbing crops.
Width
6.5 ft
6.5 ft
6.5 ft
6.5 ft
6.5 ft
Length
6.5 ft
13 ft
20 ft
26 ft
32 ft
Height
8 ft
8 ft
8 ft
8 ft
8 ft
Sq ft
42 sq ft
85 sq ft
130 sq ft
169 sq ft
208 sq ft
Owner reviews
4.7 Read all 90 reviews
Read all 90 reviews
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Dome-shaped Greenhouse
About this model

Dome-shaped Greenhouse

Sigma greenhouse has a dome-shaped arch which sheds snow and rain, and the galvanized steel frame with 6 mm twin-wall panels is rated for 55 psf of snow. Insulated doors help keep the warmth in.

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Why Planta Greenhouses

Winter-Ready Greenhouses

Heavy-duty greenhouses used by 25,000+ growers since 2019, designed to withstand heavy winters. Backed by a 10-year warranty and live customer support.

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Shipping & assembly

Arrives in labeled boxes

Free shipping to the closest terminal in the lower 48. Every panel is pre-cut and every bag of hardware is labeled, so two people can build it with the step-by-step videos.

Questions? Talk to a grower.

Mon–Fri 9am–5pm EST or Send a Message

Call us 1-877-669-1286