Designed for a lifespan of 10 to 20 years

Meet Polygrow Greenhouses

Polygrow brings polycarbonate greenhouses for American homeowners and gardeners who want to grow year-round. Twin-wall panels in 4 mm or 6 mm, a galvanized steel frame, and an arch that lets snow, hail, and wind slide off. Designed for a lifespan of 10 to 20 years, backed by a 10-year warranty and a US-based team.

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    10-year warranty on frame and panels

    Galvanized steel frame and polycarbonate panels, covered for 10 years against rust, structural damage, cracks, wear, and loss of performance.

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    14-day returns, no restocking fee

    Changed your mind? 14 days from delivery, unused, unassembled, in original packaging. No restocking fee. You pay return shipping.

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    Free shipping to all 50 states

    Every order ships free by FedEx, tracked. Greenhouses arrive on a pallet at your curb or driveway in an estimated 2 to 3 weeks.

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    US-based customer service

    Our US-based team answers by phone and email, Monday through Friday, 9 AM to 5 PM Mountain Time. We reply within 1 business day.

    Our Polycarbonate Greenhouses

      5 accessories included, a $420 value

      Every greenhouse ships with these 5 accessories at no extra cost, over $420 at the list prices on our site.

      • Universal Reinforcement Kit (Value: $89.90)
        ✔ Removable galvanized support arch that increases snow load resistance in winter. Installs without tools.

      • Additional Door (Value: $109.90)
        ✔ Better airflow and access from both ends of your greenhouse.

      • Raised Garden Bed 47 × 31 × 8 in (Value: $129.90)
        ✔ Grow at a comfortable height, no bending required.

      • Greenhouse Shelf 30 × 17 in (Value: $74.90)
        ✔ Room for pots, tools, and seedlings, right where you need them.

      • Climbing Plant Support Kit (Value: $15.90)
        ✔ Support for tomatoes, cucumbers, and vines as they climb.

        Up in a day, no special tools

        With the printed manual and video tutorials, two people can assemble a Polygrow greenhouse in 6 to 10 hours (4 to 6 for The Family). It installs on any surface: garden soil, concrete slab, field, or lot. Rather not lift a finger? On-site assembly is available for $990.

        Expandable in 6.6 ft modules

        Need more growing space? Every Polygrow model is expandable with extension modules and runs from 6.6 ft up to 39.4 ft long. Size your greenhouse to your garden, one 6.6 ft module at a time.

        Join our gardening community

          Frequently Asked Questions (FAQs)

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          Are there doors at both ends of the greenhouse?

          Every model comes with one hinged door and two manual vent windows, one at each end, for cross ventilation. Want a door at both ends? Add the Additional Door accessory for your model, it installs on the opposite gable.

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          Do you offer lean-to greenhouses?

          We do not currently offer lean-to greenhouses.

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          Can I order a custom-made greenhouse?

          Our greenhouses are prefabricated, but you can add 6.6 ft extensions to increase the length. You can also increase the height by installing a base (up to 5 ft extra).

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          How do I anchor my greenhouse to the ground?

          Every greenhouse kit comes with ground anchors that can be set directly into the ground for extra stability.

          Several options are available:

          • Directly in the soil: simple and natural.
          • Concrete slab: maximum stability.
          • Wooden frame or concrete blocks: a practical, modular alternative.
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          Can I add vent windows later?

          Yes, our vent windows can be installed after the greenhouse has been assembled.

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          Can I add accessories such as fans, heaters or lights?

          Absolutely! Our greenhouses are compatible with a wide range of accessories, such as:

          • Ventilation systems
          • Electric or gas heaters
          • LED lighting for growing plants at night
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          Can I assemble my greenhouse myself?

          Yes! Our greenhouses are designed for easy assembly without special tools. Each kit includes:

          • A detailed manual
          • YouTube tutorial videos
          • Customer support if needed
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          What help is available for assembly?

          We offer several resources:

          • YouTube videos: step-by-step tutorials
          • Manual (printed): included with your greenhouse
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          Why choose a polycarbonate greenhouse over a glass greenhouse?

          Polycarbonate panels offer several advantages:

          • Better thermal insulation (reduces heating costs)
          • Impact resistance (virtually unbreakable compared to glass)
          • UV filtering (protects plants from sunburn)

          Our Blog Articles

          View all
          • Why Choose a Polycarbonate Greenhouse?

            Why Choose a Polycarbonate Greenhouse?

            Grow all year round, simply and efficiently Whether you are a passionate hobby gardener or simply want to grow your own vegetables, a polycarbonate greenhouse is an essential tool. It...

            Why Choose a Polycarbonate Greenhouse?

            Grow all year round, simply and efficiently Whether you are a passionate hobby gardener or simply want to grow your own vegetables, a polycarbonate greenhouse is an essential tool. It...

          • How to Lay Out a Path in Your Greenhouse

            How to Lay Out a Path in Your Greenhouse

            Optimize space and make gardening easier with well-planned paths Laying out a path in your greenhouse is an essential factor in optimizing your growing area. Well-planned paths not only make...

            How to Lay Out a Path in Your Greenhouse

            Optimize space and make gardening easier with well-planned paths Laying out a path in your greenhouse is an essential factor in optimizing your growing area. Well-planned paths not only make...

          • Climate Change and Growing Tomatoes: How to Adapt

            Climate Change and Growing Tomatoes: How to Adapt

            Climate change and growing tomatoes: how to adapt? The challenges of global warming and solutions for a successful tomato crop With climate change, weather conditions are becoming more and more...

            Climate Change and Growing Tomatoes: How to Adapt

            Climate change and growing tomatoes: how to adapt? The challenges of global warming and solutions for a successful tomato crop With climate change, weather conditions are becoming more and more...

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            Polygrow Greenhouses

            Built for winter. Built to last.

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            10-year warranty

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            Free shipping to all 50 states

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            14-day returns, no restocking fee

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            US-based customer service