How to Build a Greenhouse From Old Windows

on September 21, 2023

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In today's eco-conscious world, repurposing old materials is not just a trend but a responsible way to contribute to a sustainable future. If you have a collection of old windows gathering dust, consider transforming them into a charming greenhouse, providing an ideal environment for your plants while reducing your ecological footprint. In this comprehensive guide, we'll walk you through the process of building a greenhouse from old windows, ensuring your gardening project is not only environmentally friendly but also practical and visually appealing.

1. Gathering Materials:

Begin your greenhouse project by gathering the necessary materials. Collect a variety of old windows, each with unique shapes and sizes. These will serve as the walls and roof of your greenhouse. Additionally, you'll need wooden beams for framing, screws, nails, hinges, weather stripping, and polyethylene plastic for insulation and roofing. Essential tools include a screwdriver, drill, saw, measuring tape, level, and a ladder.

2. Designing the Layout:

Plan your greenhouse's structure, taking into account the size and shape of the available windows. Create a solid foundation, ensuring it provides stability and support for the entire structure.

3. Preparing the Windows:

Clean the windows meticulously, repairing any broken glass or frames. Consider painting the frames to protect them from the elements and enhance their aesthetic appeal.

4. Constructing the Frame:

Build a sturdy base using the wooden beams, ensuring it's level and balanced. Install vertical supports at the corners and along the walls to provide adequate support for the windows.

5. Installing Windows and Roof:

Attach hinges to the window frames, allowing them to open for ventilation. Secure the windows to the frame systematically, starting from the bottom and working your way up. For the roof, use sloping windows or create a peaked roof with triangular windows, allowing for proper drainage and snow runoff.

6. Ensuring Ventilation and Sealing Gaps:

Incorporate windows that can be opened and add vents for effective ventilation. Seal gaps between windows and frames using weather stripping and caulk to prevent air leaks. Proper insulation ensures a consistent and favorable environment for your plants.

7. Flooring and Interior Setup:

Choose a suitable flooring option, such as gravel or pavers, or simply leave the natural ground. Install shelves and benches for potting, storage, and displaying your plants, optimizing the interior space for efficient gardening.

8. Final Touches and Safety Measures:

Secure all windows and ensure the greenhouse is stable against wind and other environmental factors. Consider adding decorative elements or a fresh coat of paint to personalize your greenhouse, making it an aesthetically pleasing addition to your garden.

9. Regular Maintenance:

Perform regular checks on your greenhouse, inspecting the windows, frames, and sealing to identify and address any necessary repairs promptly. Regular maintenance ensures the longevity and functionality of your greenhouse.


Building a greenhouse from old windows is not only an innovative way to recycle materials but also a rewarding endeavor that allows you to nurture your plants in a sustainable environment. By following these steps and incorporating the mentioned entities, you can create a greenhouse that not only supports your gardening passion but also showcases your commitment to eco-friendly practices. Happy gardening in your new, sustainable haven!



Q1. Is it necessary to use old windows, or can I use new ones for my greenhouse project?

While using old windows adds a unique charm to your greenhouse, you can certainly use new windows if you prefer. The primary advantage of using old windows is their sustainability and cost-effectiveness.

Q2. What should I consider when choosing the location for my window greenhouse?

When selecting a location, think about sunlight exposure, prevailing wind direction, and access to water. Choose a spot that receives ample sunlight throughout the day, especially during the growing season. Ensure that the location is sheltered from strong winds, as this can damage your greenhouse. Finally, proximity to a water source makes it easier to maintain proper hydration for your plants.

Q3. Are there any specific tools required for this project?

Yes, you will need essential tools like a circular saw, drill, level, measuring tape, and screws. Having a sawhorse or workbench can also be helpful for cutting and assembling materials. Safety gear, including gloves and safety glasses, is crucial to protect yourself during construction.

Q4. What are some alternative roofing options if I can't find enough old windows?

If you don't have access to sufficient old windows, consider using clear polycarbonate sheets or corrugated greenhouse panels for the roof. These materials provide transparency while protecting your plants

Q5. What types of plants are suitable for a window greenhouse?

A window greenhouse can accommodate a wide range of plants. Popular choices include herbs, vegetables, flowers, and even some small fruit trees. The key is to select plants that have similar environmental requirements and adapt well to the conditions you can provide.

Q6. What's the best way to secure old windows within the greenhouse frame?

Secure the old windows using hinges and latches. This allows for easy ventilation and access when needed. Make sure the hinges and latches are securely fastened to ensure the windows stay in place during adverse weather conditions.