Sigma Gen III

Sigma Gen III (9.8 ft wide) – The new version of the Sigma Greenhouse, offering a fixed 3m width and expandable length for larger or evolving growing setups.

  • Sigma Urban (Gen III)
    55 psf (265 kg/m²)Snow Load

    Sigma Urban (Gen III)

    Sigma Urban (Gen III)

    Size: 10' × 13' × 7'
    4.7
    Rated 4.7 out of 5 stars
    89 Reviews
    $2,850 USD
    $3,050 USD Save $200 Sale $2,850 USD
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  • Sigma 20 (Gen III)
    55 psf (265 kg/m²)Snow Load

    Sigma 20 (Gen III)

    Sigma 20 (Gen III)

    Size: 10' × 20' × 7'
    4.7
    Rated 4.7 out of 5 stars
    89 Reviews
    $3,500 USD
    $3,800 USD Save $300 Sale $3,500 USD
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  • Sigma 26 (Gen III)
    55 psf (265 kg/m²)Snow Load

    Sigma 26 (Gen III)

    Sigma 26 (Gen III)

    Size: 10' × 26' × 7'
    4.7
    Rated 4.7 out of 5 stars
    89 Reviews
    $4,150 USD
    $4,550 USD Save $400 Sale $4,150 USD
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  • Sigma 32 (Gen III)
    55 psf (265 kg/m²)Snow Load

    Sigma 32 (Gen III)

    Sigma 32 (Gen III)

    Size: 10' × 32' × 7'
    4.7
    Rated 4.7 out of 5 stars
    89 Reviews
    $4,800 USD
    $5,300 USD Save $500 Sale $4,800 USD
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  • Sigma 39 (Gen III)
    55 psf (265 kg/m²)Snow Load

    Sigma 39 (Gen III)

    Sigma 39 (Gen III)

    Size: 10' × 39' × 7'
    4.7
    Rated 4.7 out of 5 stars
    89 Reviews
    $5,450 USD
    $6,050 USD Save $600 Sale $5,450 USD
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Sigma Medium

Sigma Medium (8.2 ft wide) – The new version of the Sigma Greenhouse, built with a fixed 2.5m width and modular length extensions for added growing space over time.

  • Sigma 250 (Gen III) greenhouse with transparent panels in a warehouse setting
    55 psf (265 kg/m²)Snow Load

    Sigma Medium Urban (Gen III)

    Sigma Medium Urban (Gen III)

    Size: 8' × 13' × 7.5'
    $2,750 USD
    $2,950 USD Save $200 Sale $2,750 USD
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  • Sigma Medium 20 (Gen III)
    55 psf (265 kg/m²)Snow Load

    Sigma Medium 20 (Gen III)

    Sigma Medium 20 (Gen III)

    Size: 8' × 20' × 7.5'
    $3,400 USD
    $3,700 USD Save $300 Sale $3,400 USD
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  • Sigma 250 (Gen III) greenhouse in a garden setting with trees and flowers
    55 psf (265 kg/m²)Snow Load

    Sigma Medium 26 (Gen III)

    Sigma Medium 26 (Gen III)

    Size: 8' × 26' × 7.5'
    $4,050 USD
    $4,450 USD Save $400 Sale $4,050 USD
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  • Sigma Medium 32 (Gen III)
    55 psf (265 kg/m²)Snow Load

    Sigma Medium 32 (Gen III)

    Sigma Medium 32 (Gen III)

    Size: 8' x 32' x 7.5'
    $4,700 USD
    $5,200 USD Save $500 Sale $4,700 USD
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Sigma Small

Sigma Small (6.5 ft wide) – The new version of the Sigma Greenhouse, featuring a fixed 2m width with extendable length to grow with your needs.

  • Arch-shaped Sigma 2x4 (Gen III) greenhouse in a garden with flowers and a stone path by Planta Greenhouses EU.
    55 psf (265 kg/m²)Snow Load

    Sigma Small Compact (Gen III)

    Sigma Small Compact (Gen III)

    Size: 6.5' × 6.5' × 8'
    $2,000 USD
    $2,100 USD Save $100 Sale $2,000 USD
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  • Clear Sigma 200 (Gen III) greenhouse with open door in a garden setting - by Planta Greenhouses EU.
    55 psf (265 kg/m²)Snow Load

    Sigma Small Urban (Gen III)

    Sigma Small Urban (Gen III)

    Size: 6.5' × 13' × 8'
    $2,650 USD
    $2,850 USD Save $200 Sale $2,650 USD
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  • Sigma 200 (Gen III) greenhouse with transparent panels on a grassy area in front of a house.
    55 psf (265 kg/m²)Snow Load

    Sigma Small 20 (Gen III)

    Sigma Small 20 (Gen III)

    Size: 6.5' × 20' × 8'
    $3,300 USD
    $3,600 USD Save $300 Sale $3,300 USD
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  • Sigma 2x8 (Gen III) greenhouse with a curved glass roof and walls on a grassy area.
    55 psf (265 kg/m²)Snow Load

    Sigma Small 26 (Gen III)

    Sigma Small 26 (Gen III)

    Size: 6.5' × 26' × 8'
    $3,950 USD
    $4,350 USD Save $400 Sale $3,950 USD
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  • Sigma Small 32 (Gen III)
    55 psf (265 kg/m²)Snow Load

    Sigma Small 32 (Gen III)

    Sigma Small 32 (Gen III)

    Size: 6.5' × 32' × 8'
    $4,600 USD
    $5,100 USD Save $500 Sale $4,600 USD
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All Sigma Greenhouse Sizes

  • Sigma Small
    Sigma Small
    A compact 6.5 ft wide greenhouse with a classic look and heavy duty build. The galvanized steel frame and premium polycarbonate panels stand up to snow, wind, and cold winters, with expandable length to grow as you do.
    View Sigma Small →
  • Sigma Medium
    Sigma Medium
    At 8.2 ft wide, the Sigma Medium offers generous growing space with modular length extensions. Built from galvanized steel and high quality polycarbonate, it performs reliably in harsh weather conditions.
    View Sigma Medium →
  • Sigma Gen II
    Sigma Gen II
    The original Sigma design features a traditional shape, durable galvanized steel frame, and expandable length. Built to handle snow, wind, and cold weather season after season.
    View Sigma Gen II →

See More Greenhouses

See All Greenhouse Models