SKU 104401 104411 104421 104431 104441 104381 104271 104281 104291 104301 104241 104251 104261 104341 104351 104361 104371 104311 104321 104331 143541 143531 143421 143411 143401 143391 143381 149401 143431 104391

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free freight to lower 48

Whether you are at high elevation or near sea level, the Summit is at the top of the line with it's height, durability, aesthetics, and more.

This beautiful barn-style greenhouse gives you a year-round growing space with a heavy-duty aluminum frame and 10mm twin-wall polycarbonate panels.

Engineered to perform in harsh environments, the Grandio Summit's rugged durability makes it one of the most insulated greenhouses on the market. Its barn shape design is both elegant and functional, allowing plenty of growing space while looking great in your yard.

Made to meet the highest standards of hobby and professional gardeners alike, the 1.6mm profile aluminum frame provides a stronger and more durable build than its competitors.

The Summit's range of features and accessories provides a well ventilated growing space with ample roof windows and re-engineered sliding double doors. The UV-protected 10mm paneling has an (R) value of 1.89* and heat loss (U) value of 0.53, allowing for optimal insulation in all climates.

The doors are hung from above which eliminates jamming and the door wheels are made from high-quality nylon for durability. The door wheel bolt is turned from solid brass with a smooth shank to reduce wear. The doors come standard with heavy-duty lockable door handles and included key.

Carefully engineered to the highest standards, gardeners of all types will love the combination of strength, quality, performance, and value that Grandio Greenhouses are known for.

Reach the Summit with Grandio!

Cover Your Bases

Concrete Slab or Wood Deck Installation: If you plan on constructing your Summit on a concrete slab or wooden surface, the included Flat Mount Base Kit will offer solid footing. The Flat Mount Base Kit includes your choice of anchors for concrete slab or wooden surfaces.

In-earth Installation: If you plan to install your Grandio Summit Greenhouse directly into the earth, we highly recommend our Steel Base Kit with Earth L-Bolt Anchor Kit. The Steel Base Kit is powder coated to resist rust and decay and is designed to be buried into the ground or back filled with gravel providing a solid foundation to combat wind and other extreme environments. Just select "Base Kit (Earth L-Bolt Anchor Kit)" when you checkout and you'll get everything you need.

Grandio Summit 12x20

Basic Kit Includes:

10mm Twin-Wall Panels

(10) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

Actual Size:

12' W x 19.78' L x 9.25' H

Premium Kit Includes:

10mm Twin-Wall Panels

(10) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

(10) Auto Roof Window Openers

(2) Packs of 10 Plant Hangers

(2) 8 oz. Brillianize Cleaner

(1) Trellis Kit

(1) Drip Kit

Grandio Summit 12x24

Basic Kit Includes:

10mm Twin-Wall Panels

(12) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

Actual Size:

12' W x 23.68' L x 9.25' H

Premium Kit Includes:

10mm Twin-Wall Panels

(12) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

(12) Auto Roof Window Openers

(2) Packs of 10 Plant Hangers

(2) 8 oz. Brillianize Cleaner

(1) Trellis Kit

(1) Drip Kit

Grandio Summit 12x28

Basic Kit Includes:

10mm Twin-Wall Panels

(14) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

Actual Size:

12' W x 28' L x 9.25' H

Premium Kit Includes:

10mm Twin-Wall Panels

(14) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

(14) Auto Roof Window Openers

(2) Packs of 10 Plant Hangers

(2) 8 oz. Brillianize Cleaner

(1) Trellis Kit

(1) Drip Kit

Grandio Summit 12x32

Basic Kit Includes:

10mm Twin-Wall Panels

(16) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

Actual Size:

12' W x 32' L x 9.25' H

Premium Kit Includes:

10mm Twin-Wall Panels

(16) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

(16) Auto Roof Window Openers

(2) Packs of 10 Plant Hangers

(2) 8 oz. Brillianize Cleaner

(1) Trellis Kit

(1) Drip Kit

Grandio Summit 12x8

Basic Kit Includes:

10mm Twin-Wall Panels

(4) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

Actual Size:

12' W x 8.1' L x 9.25' H

Premium Kit Includes:

10mm Twin-Wall Panels

(4) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

(4) Auto Roof Window Openers

(1) Pack of 10 Plant Hangers

(1) 8 oz. Brillianize Cleaner

(1) Trellis Kit

(1) Drip Kit

Grandio Summit 12x12

Basic Kit Includes:

10mm Twin-Wall Panels

(6) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

Actual Size:

12' W x 12' L x 9.25' H

Premium Kit Includes:

10mm Twin-Wall Panels

(6) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

(6) Auto Roof Window Openers

(1) Pack of 10 Plant Hangers

(1) 8 oz. Brillianize Cleaner

(1) Trellis Kit

(1) Drip Kit

Grandio Summit 12x16

Basic Kit Includes:

10mm Twin-Wall Panels

(8) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

Actual Size:

12' W x 15.89' L x 9.25' H

Premium Kit Includes:

10mm Twin-Wall Panels

(8) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

(8) Auto Roof Window Openers

(2) Packs of 10 Plant Hangers

(2) 8 oz. Brillianize Cleaner

(1) Trellis Kit

(1) Drip Kit

Grandio Summit 12x20

Basic Kit Includes:

10mm Twin-Wall Panels

(10) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

Actual Size:

12' W x 19.78' L x 9.25' H

Premium Kit Includes:

10mm Twin-Wall Panels

(10) Roof Windows

Rain Gutters

Drain Kit

Extreme Snow Load Kit

Flat Mount Anchor Kit

(10) Auto Roof Window Openers

(2) Packs of 10 Plant Hangers

(2) 8 oz. Brillianize Cleaner

(1) Trellis Kit

(1) Drip Kit

free freight to lower 48 For locations outside the lower 48, shipping costs apply if parts are defective or missing or damaged from the original shipment.