Have you ever seen those beautiful, rustic greenhouses made from old windows and thought, “I could do that”? Building an old window greenhouse is not only an eco-friendly way to recycle vintage materials, but it also creates a really nice space for your plants.

Whether you’re an experienced gardener or just starting out, this project is a fantastic way to add character to your garden while giving new life to old materials.

In this article, we’ll guide you through the simple steps to create your very own old window greenhouse, perfect for growing your favorite plants all year round. Let’s get started! 🌲

Looking for the best polycarbonate greenhouses in 2024? The Best Polycarbonate Greenhouses To Buy In 2024 For People On A Budget

What is an Old Window Greenhouse?

These greenhouses aren’t just pretty to look at—they’re practical, too. The windows let in plenty of sunlight, creating a warm and cozy space that’s perfect for growing plants. You can customize the size and shape to fit your space and needs, making it a fun project for anyone who loves gardening or DIY. Plus, it’s a great way to give new life to old materials and add a special touch to your garden.

9 Simple Steps To Build A Greenhouse Made From Old Windows

Our first job is to collect the materials that we need to build the old windows greenhouse.

Here’s a simple guide to help you get started:

Materials Needed

1. Old Windows: As many as needed for your desired size.
2. Wooden Frame: Lumber for the base, frame, and roof support.
3. Screws and Nails: For assembly.
4. Hinges and Latches: For the door and any windows you want to open.
5. Caulk or Weatherstripping: To seal gaps and make it weatherproof.
6. Gravel or Concrete: For the foundation.

And of course – let’s not forget the tools.

Tools Needed

• Drill and screwdriver
• Hammer
• Saw
• Level
• Measuring tape
• Safety gear (gloves, goggles)

Step #1: Planning & Design

💡 Etsy is a great place to find old window greenhouse plans if you’re stuck in the planning & design phase.

Step #2: Prepare The Foundation

To start, pick a level and sunny spot in your yard for your old window greenhouse. Sunlight is essential for plant growth, so choose a location that gets plenty of it throughout the day. Once you’ve chosen the spot, it’s time to prepare the foundation.

For a simple and budget-friendly option, spread a layer of gravel to create a stable base. This helps with drainage and keeps the area from getting muddy. If you’re looking for something more permanent and sturdy, consider pouring a concrete slab. This provides a solid, level surface and is especially good for larger greenhouses.

Here is a detailed guide on greenhouse flooring to help you choose your foundation: Greenhouse Flooring Ideas: The Best Materials For Plant Growth

Here is more detailed instructions on the foundations:

Step #3: Building The Frame

To build the frame for your old window greenhouse, start by constructing a base using treated lumber, which helps prevent rot. Then, add upright supports at each corner and along the sides where needed. These will hold up the windows and give the structure stability.

Next, create a roof frame, making sure it’s sturdy enough to support the windows or any roofing material you choose. As you build, use a level to check that everything is even and square, and measure diagonally to ensure the structure is properly aligned. This careful setup will make installing the windows much easier and ensure the greenhouse stands strong.

The frame can be as simple or complicated as you want it to be.

Step #4: Installing The Windows

To install the windows, start by attaching them to the wooden frame with screws. Begin with the walls, making sure each window is securely fastened. Leave a space for the door, so you can easily enter the greenhouse. After the walls are done, move on to the roof. If you’re using windows there, be careful to secure them well, as they’ll bear some weight.

For ventilation, consider hinging a few windows so they can open like vents, which helps control the temperature and airflow inside. This setup will keep your plants healthy and your greenhouse comfortable to work in.

Here are some great instructions for installing a window:

Step #5: Adding The Roof

When adding the roof to your old window greenhouse, start by securely attaching the windows if you’re using them. Make sure they’re watertight to prevent leaks. Use caulk or weather-stripping where needed. Alternatively, you can opt for clear plastic or polycarbonate panels for the roof. These materials are lightweight, let in lots of light, and are less likely to leak.

Whichever you choose, consider building a sloped roof to help with water drainage. This will keep water from pooling on top and reduce the risk of leaks, ensuring your greenhouse stays dry inside.

Here are some great polycarbonate panels to buy:

DGSL Polycarbonate Panels

These 14 pcs of 2′ x 1′ x 0.16” twin-wall polycarbonate panels by DGSL are perfect for any weather, keeping your garden or greenhouse cozy in winter and cool in summer. Made from durable, double-wall polycarbonate, they let in 80% of sunlight, boosting plant growth while being tough enough to resist shattering and severe weather. Cutting and installing them is a breeze, making them a great pick for greenhouses, gardens, or even building roofs. They’re a solid upgrade from traditional iron sheds, offering better light and protection against water seepage.

Check Price ➡️ Amazon

Step #6: Sealing & Waterproofing

After installing the windows, it’s important to seal any gaps between them and the wooden frame. Use caulk to fill these spaces, which will help keep your greenhouse warm and prevent drafts. Apply the caulk carefully along the edges where the windows meet the frame.

For extra protection, you can add weatherstripping around the windows and door. This creates a better seal and keeps out cold air and moisture. Proper sealing is essential for maintaining a consistent temperature inside, protecting your plants from the elements, and ensuring that your greenhouse stays cozy and efficient year-round.

Gorilla Caulk

Gorilla Waterproof Caulk & Seal is a white, 100% silicone sealant that seals out water, air, and moisture. It’s perfect for indoor and outdoor use on windows, doors, and more. It’s water-ready in 30 minutes, mold and mildew resistant, and doesn’t shrink or crack over time.

Check Price ➡️ Amazon

Step #7: Door Installation

To install a door in your old window greenhouse, you can either use an old window or make a simple door frame from wood and add a window to it. Start by attaching the door frame to the greenhouse structure, making sure it’s level. Then, use sturdy hinges to hang the door securely. Make sure it swings open and closed smoothly.

For added security and to keep the door closed tightly, install a latch. This will help keep the greenhouse warm and secure. If you’re using a window as the door, ensure it’s properly sealed to prevent drafts.

Step #8: Finishing Touches

For the finishing touches in your old window greenhouse, consider adding shelving or benches to maximize space and make plant care easier. You can use sturdy wood or metal shelves, depending on the look and durability you want.

Plant stands are also great for displaying different types of plants at varying heights. To make the greenhouse more comfortable and functional, think about adding a pathway or flooring. Gravel, paving stones, or even bricks can create a neat and practical surface, keeping the area dry and making it easy to walk around. These additions will make your greenhouse both beautiful and functional.

Recommendation: Eagle Peak Shelving

Check Price ➡️ Amazon

Step #9: Decorate & Enjoy

Once your old window greenhouse is complete, it’s time to add some personal touches. You can paint the frame to match your garden’s style or leave it natural for a rustic look. Consider adding decorations like hanging planters, fairy lights, or decorative signs to make the space inviting.

For a practical addition, install a rainwater collection system to water your plants sustainably. This can be as simple as a gutter and barrel setup. Don’t forget to bring in comfy seating if you have space; it’s a great spot to relax and enjoy the fruits of your labor.

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Cost Breakdown For An Old Window Greenhouse

Building an old window greenhouse can be affordable if you plan carefully. Here’s a rough cost breakdown:

1. Old Windows: Often free if salvaged, or you might find them for $5-$20 each at salvage yards or online.
2. Lumber for Frame: Depending on size, expect to spend around $100-$300 on treated wood.
3. Screws, Nails, Hinges, and Latches: These small hardware items might cost around $30-$50.
4. Caulk and Weatherstripping: Sealing materials can range from $20-$40.
5. Foundation Material: Gravel is cheap, about $50, while a concrete slab can be more expensive, around $200-$400.

Total Estimate: This puts your total at roughly $200-$800, depending on your choices and resources.

Budgeting Tips:

• Scavenge and Salvage: Look for free or discounted materials in your community.
• Shop Sales: Check for sales at hardware stores or online.
• DIY Skills: Doing the work yourself saves labor costs.
• Plan Ahead: Draw up your design and list materials to avoid extra trips and costs.

Keep an eye out for free or low-cost materials, and don’t be afraid to get creative with what you find!

Where Can You Find Old Windows?

Finding old windows for your greenhouse can be a fun treasure hunt! Start by checking out local salvage yards or architectural salvage stores, where you can find all sorts of vintage building materials. You can also look at flea markets or garage sales, where people might be getting rid of old windows.

Don’t forget to browse online marketplaces like Craigslist, Facebook Marketplace, or eBay; you can often find great deals there. Sometimes, simply asking around in your neighborhood or posting on community boards can lead you to people who are renovating and looking to get rid of old windows.

My favorite places:

• Flea markets
• Garage sales
• Craigslist
• Facebook Marketplace
• Ebay

Facebook Marketplace is a goldmine for finding old windows (just check the price)

Choosing The Right Windows

When choosing windows for your old window greenhouse, consider a few key factors to make sure they fit your needs and project:

1. Size and Shape: Start by measuring the space where each window will go. Ideally, the windows should be similar in size for a uniform look, but mixing shapes can add character. Just ensure they can fit together neatly.
2. Type of Glass: Single-pane windows are common and work well, but double-pane windows provide better insulation. This can be especially useful if you plan to use the greenhouse year-round in colder climates.
3. Condition: Look for windows that are in good condition without cracks or major damage. Minor scratches or peeling paint can be fixed up, but avoid windows with compromised seals, especially in double-pane varieties.
4. Frame Material: Wooden frames are easy to work with and can be painted, but make sure they’re not rotting. Metal frames are durable but can be harder to cut to size. Vinyl frames are lightweight and low maintenance.
5. Ventilation: Consider including a few windows that can open to help with ventilation. This is crucial for controlling temperature and humidity levels inside the greenhouse.
6. Availability and Cost: Sometimes your choice will depend on what’s available. Check out local salvage yards, online marketplaces, and garage sales. You can often find a good deal on windows being removed from older homes.

By keeping these factors in mind, you can select the best windows for your greenhouse that will not only look great but also function well for your plants’ needs.

Best Plants to Grow in an Old Window Greenhouse

An old window greenhouse can be a cozy home for a variety of plants. With plenty of natural light and a controlled environment, you can grow many things year-round. Herbs like basil, mint, and parsley thrive here, enjoying the light and slightly warm conditions.

Leafy greens like lettuce, spinach, and kale also do well, providing fresh, home-grown salads. If you like flowers, consider growing orchids or African violets; they love the humidity and filtered light. For a touch of color and fragrance, try geraniums or petunias. Tomatoes and peppers are great for vegetable lovers, as they thrive in warm, sunny spots. Remember to consider your local climate and adjust your greenhouse’s conditions to suit the plants you choose.

Here is a list of some plants that thrive in DIY greenhouse old windows:

Basil	African Violets
Mint	Geraniums
Parsley	Petunias
Lettuce	Tomatoes
Spinach	Bell Peppers
Kale	Cucumbers
Orchids	Strawberries

Conclusion:

Building an old window greenhouse is a rewarding project that combines creativity with sustainability. It’s a great way to recycle vintage materials, add charm to your garden, and create a cozy space for your favorite plants. Whether you’re growing herbs, veggies, or flowers, this greenhouse will be a beautiful and practical addition to your home. By carefully choosing your materials and following these simple steps, you can enjoy a unique and functional greenhouse all year round.

So, gather your tools and windows, and start building your own little garden sanctuary. Happy gardening!

Here are our favorite accessories: 14 Best Greenhouse Accessories That You Need In 2024

FAQs

Can I use old windows for a greenhouse?

Yes, you can definitely use old windows to build a greenhouse! It’s an eco-friendly way to recycle materials, and it gives your greenhouse a unique, rustic charm. Just make sure the windows are in good condition and properly sealed.

Can you make a greenhouse with single pane windows?

Yes, single pane windows can be used to make a greenhouse. While they don’t insulate as well as double-pane windows, they still let in plenty of light and create a warm environment for your plants. Just be sure to seal any gaps to keep the warmth in.

Why do greenhouses have glass windows?

Greenhouses have glass windows because glass allows sunlight to enter, which warms the interior. This natural heat helps create a suitable environment for growing plants. Glass is also durable and can last a long time, making it a popular choice for greenhouse construction.

What is the alternative to greenhouse windows?

An alternative to traditional glass windows in a greenhouse is using clear plastic or polycarbonate panels. These materials are lightweight, often more affordable, and provide good insulation. They also allow plenty of light to enter, similar to glass.

What can I use instead of glass for a greenhouse?

Instead of glass, you can use materials like clear plastic sheeting, polycarbonate panels, or acrylic sheets. These options are generally more shatter-resistant than glass and can be easier to install. They also offer good light transmission for plant growth.

Can you make a greenhouse out of old windows?

Absolutely! Making a greenhouse out of old windows is a fantastic DIY project. It not only recycles old materials but also creates a charming and functional space for your plants. Just make sure to properly support the structure and seal the windows well to keep the greenhouse warm and protected.