Sigma Greenhouse Gen III

Spacious Backyard Kits, 10 ft Wide

4.8 · 89 reviews
Save $200
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Close-up of a metal frame of a Sigma 300 (Gen III) greenhouse.
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Close-up of a metallic door hinge of a Sigma 300 (Gen III) greenhouse.
Sigma Greenhouse Gen III
A closeup of a Sigma 300 (Gen III) greenhouse.
Sigma Greenhouse Gen III
A side view of a Sigma 300 (Gen III) greenhouse.
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
Metallic door with a reflective surface, of a Sigma 300 (Gen III) greenhouse.
Sigma Greenhouse Gen III
Sigma Greenhouse Gen III
A detail on the frame of a Sigma 300 (Gen III) greenhouse.

Sigma Urban

Sigma greenhouse kits are arched backyard greenhouses rated for a 265 kg/m² (55 psf, 4.5 ft) snow load and 100 km/h wind, with 6 mm twin-wall polycarbonate panels and a 10-year warranty. They're for sale in 5 sizes, all 10 ft wide, so you can choose the length that fits your space. Find your greenhouse.

Size: Sigma Urban · 10′ × 13′Size guide
$3,850$4,050Save $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

Send us a message

Our team will reply within one business day.

Message sent

We reply within one business day.

Which size is best for your garden?

Get this sizing guide with photos and bed layouts.

Get the free guide
pg guide cover
  • 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 265 kg/m² (55 psf, 4.5 ft).
  • Wind resistant up to 100 km/h 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 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 265 kg/m² (55 psf, 4.5 ft) 
  • Wind Resistant up to 100 km/h
  • We offer a 10-year warranty because our greenhouse is heavy-duty and long-lasting.

Les serres sont des produits exceptionnels qui nécessitent une expédition et une manutention particulières. C'est pourquoi nous avons travaillé sans relâche au cours de la dernière année pour obtenir des tarifs d'expédition préférentiels pour nos clients. La plupart des envois au Canada et aux États-Unis coûtent entre 250 $ et 450 $ .

  • Nous vous contacterons pour confirmer le prix d'expédition, en fonction de votre emplacement et de la taille de votre commande.
  • Les frais d'expédition pour la plupart des commandes de serres résidentielles sont compris entre 250 $ et 450 $ . Les clients des régions éloignées peuvent devoir payer un supplément.
  • Lors de votre commande, veuillez indiquer le bon numéro de téléphone et la bonne adresse. Vous serez contacté par téléphone avant l'expédition. Nous déclinons toute responsabilité en cas de livraison à une adresse incorrecte.
  • Dans le cadre du processus de livraison, nous avons besoin d'un numéro de téléphone joignable (pour que la société de messagerie puisse vous contacter) avant que l'article ne soit expédié.
  • Le service de livraison haut de gamme n'est pas disponible. Les composants de la serre sont livrés en plusieurs exemplaires. boîtes, dont la plus grande Poids : 80 lb. La serre sera livrée directement dans votre entrée. Veuillez prendre les dispositions nécessaires pour que le colis soit transporté jusqu'à son lieu d'installation.
  • Nous n'expédions pas vers des boîtes postales, car dans la plupart des cas, vous devrez signer pour votre article.
  • Les commandes passées le week-end ou les jours fériés ne commenceront pas à être traitées avant le jour ouvrable suivant.

Free guide

The Beginner's Guide for Greenhouse Owners

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

Sigma Greenhouse Gen III Measurements

Sigma Urban · 10′ × 13′

3D view
Side view

Compare Sigma Greenhouse Gen III 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.
Sigma Urban greenhouse, 10 ft × 13 ft, with the door and window open and plants inside Sigma Urban
10′ × 13′
Sigma 20 arched greenhouse, 10 ft × 20 ft, on a lawn with a gravel path Sigma 20
10′ × 20′
Sigma 26 greenhouse, 10 ft × 26 ft, with flower beds along the side Sigma 26
10′ × 26′
Sigma 32 greenhouse, 10 ft × 32 ft, in a landscaped garden with a stone path Sigma 32
10′ × 32′
Sigma 39 greenhouse, 10 ft × 39 ft, with flower borders along the side Sigma 39
10′ × 39′
Price
Sale$4,050
$3,850
Sale$5,050
$4,750
Sale$6,050
$5,650
Sale$7,050
$6,550
Sale$8,050
$7,450
About
Beds along both sides and a bench for seed trays: room for a full season of tomatoes and peppers.
Room for in-ground beds, trellised crops and a potting bench.
Long beds on both sides, tall crops at one end and a wheelbarrow-wide path.
Several crop zones, a propagation corner and space for a heater.
The largest Sigma: beds, benches, storage and a work area for year-round growing.
Width
10 ft width
10 ft width
10 ft width
10 ft width
10 ft width
Length
13 ft length
20 ft length
26 ft length
32 ft length
39 ft length
Height
7 ft height
7 ft height
7 ft height
7 ft height
7 ft height
Sq ft
130 sq ft
200 sq ft
260 sq ft
320 sq ft
390 sq ft
Owner reviews
4.8 Read all 89 reviews
Read all 89 reviews
Open the full story page →
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.

Winter-Ready Greenhouses
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.

Arrives in labeled boxes
Shipping & assembly

Arrives in labeled boxes

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.

Questions? Talk to a grower.

Mon–Fri 9am–5pm EST or Send a Message

Call us 1-877-669-1286