15 Free DIY Greenhouse Plans to Help You Build One in Your Garden This Weekend

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o you like the idea of being able to extend your growing season?

What about having a great space to start seeds a little earlier?

Then you need a greenhouse.

They are a great addition to any homestead. Any expense you accrue in building one can quickly be made back with the extra product they help produce.

Here are 84 of the best (and free!) greenhouse plans to help you build the greenhouse of your dreams.

1. The ‘Barn’ Greenhouse

This greenhouse gets its name honest. It is shaped just like a barn. Its appearance is one that will fit right in on any homestead.

The site includes all plans (all for free) on how to construct this greenhouse. It also includes a list of all tools.

Ana does advise that you read everything over thoroughly before jumping into building. It is nice that the medal slabs that are used for the side do not have to be cut to fit the sides. You can just throw them right up!

From the looks of it, this greenhouse would be easier to build and look great to boot.

Dimensions (feet): 12 x 11.5

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2. The Big Greenhouse

The ‘big’ greenhouse is going to be a large 10×16 structure. These plans are very basic but would certainly do the job.

This greenhouse is a simple A-frame structure. It is a personal preference, but you will probably have to build shelving or above ground beds inside of it. However, you could just plant directly in the ground if you choose.

With these plans, you will have plenty of room to decide how you want to lay out the inside of the structure. You will also have ample amount of room to grow almost anything your heart desires.

Dimensions (feet): 16 x 10

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3. The ‘Hoop’ Greenhouse

This design is a little different from the others mentioned. It has a round formation. It is very simple to build and is less complex than most.

It requires very little tools but the tools that are needed are listed along with the plans. Most people that build this form use it in a cold frame fashion. You can add grow light to it if you choose, though.

This is the type of greenhouse I have on my own homestead. You can read all about how we built ours for less than $200 on the very bottom of this page.

If you are looking for an inexpensive option, this is a great fit.

Dimensions (feet): 32 x 12

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4. The 50-Dollar Greenhouse

I love this option for an inexpensive greenhouse. They used lots of ingenuity and built a structure that will fulfill its purpose without breaking the bank.

That is what homesteading is about after all.

All of the plans and tools are listed together. They also give you a step by step tutorial with pictures of how to build this structure.

It is states up front that in order to build this greenhouse for around $50 it will take some upcycling and scouting of free items on your part.

They provide a price list for what they did spend so it gives you a good idea of how and where to find these items.

Dimensions (feet): 15 x 8

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5. The Geo Dome

This greenhouse reminds me of part of a jungle gym I use to play on at the park as a kid. It is a circular shaped greenhouse and very interesting to look at.

Since this greenhouse is a circular shape it makes it better for withstanding high winds.

The plans and tool are available, along with pictures of this project being built.

This appears to be a really cool greenhouse. It is said to have the most growing space in comparison to most any other greenhouse available.

The only thing I notice when looking at the project being built is that it is a great option for those with great carpentry skills.

It does not appear to be for first-timers.

Dimensions (feet): 18 (diameter)

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6. The Storm Windows Greenhouse

Maybe you aren’t looking to grow mass amounts of food in your greenhouse. Maybe you just want to prolong a plant’s life or start a few seeds.

What about you?

No worries. We have not forgotten you. This is the greenhouse for you.

Another great thing about this greenhouse is that is can be fairly cheap.

It is built out of old storm windows. If you have a second hand home store in your area, you should be able to find the materials at a reasonable price.

If you’d prefer to go with brand new windows, you can do that to. She provides pictures, plans, and all of the items you will need to build this little beauty.

Dimensions (feet): 1 x 1

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7. The Upcycled Old Windows Greenhouse

This greenhouse is a lot like the previous one. However, it uses all old windows.

This is a great option for someone looking to build a smaller greenhouse without a lot of cost added to it.

You can make this greenhouse larger if you choose. All of the plans are available and the tools listed with them that you will need in order to construct it.

I love this greenhouse because it is very quaint looking. It could also potentially be free to build. You can find old windows on sites like Craigs List for free at times.

Dimensions (feet): 10 x 6

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8. The BuildEazy Greenhouse

This greenhouse looks really cool. There are no other words for it.

It has windows on top that can be opened when ventilation is necessary. It also includes a door in the front and back as well.

These features can be optional, but they are great features so if you can add them I would recommend it.

These plans are also free. They do not include pictures of the building process like some of the others that I’ve mentioned.

So be sure that you read them thoroughly before jumping into this project.

Dimensions (feet): 10 x 8

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9. The Plastic Bottle Greenhouse

If you hate or love plastic bottles, this greenhouse is for you. This is another greenhouse that could be potentially free if you know where to look for the materials.

You can shape it in any form that you wish. They show pictures of a typical A-frame greenhouse as well as a hoop greenhouse too.

There are no actual plans but certain tips are offered since the building process is rather self-explanatory.

It is important to keep the bottles lined up so your walls are even.

This greenhouse should work effectively for any need you might have. You should also have ample amount of growing space.

The actual process might be a little tedious but when you are building something for free, that extra bit of effort is worth it.

Dimensions (feet): 8 x 6

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10. The Basement Greenhouse

This is another really awesome greenhouse. If you have a basement, this is the greenhouse for you!

You will actually construct the frame right outside of your walk-out basement door. This allows you to walk straight from your home into your greenhouse.

Pictures of the build are available as well as instructions on how to build it. From the pictures this is a very functional greenhouse. You cannot plant directly into the ground.

However, you can start many seeds on shelves inside this greenhouse. You could also plant produce in pots and grow them year round in this greenhouse as well.

Dimensions (feet): 10 x 6.5

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11. CD Case Greenhouse

This is the wildest greenhouse I have ever seen!

This talented individual took old CD cases and utilized them by turning them into a greenhouse.

She openly states in the beginning of her tutorial that there are many instructions to building this greenhouse.

However, she doesn’t want you to be scared away from trying to build this masterpiece yourself. There are just many minute details that she wanted to be sure you understood.

It is a smaller greenhouse. The actual picture shows that it holds only about 3 large plants. I am sure you could change it to fit your individual needs as well.

Dimensions (feet): 3.75 x 2.5

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12. The IDEA Donna Greenhouse

This greenhouse is a great greenhouse for the beginner.

It has a strong wooden frame that should help it to last. While also being simply built.

The plastic sides still allow for ample amount of sunlight to get through while still holding heat in during the colder temps.

The person that wrote the instructions on this greenhouse actually got the idea from another blog. The only problem was there were no instructions.

She fixed that problem by building this greenhouse from those pictures and creating very detailed instructions (and pictures) for those that want to give it a try.

The details are all there, the functionality is there, and the budget is on point too. If you are working on a tight budget and in need of a greenhouse, this could be the one for you.

Dimensions (feet): 8 x 8

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13. The $25 Cold Frame

This is another budget friendly greenhouse idea.

It is actually a smaller greenhouse. The purpose of it is to encompass small potted plants.

It has a hoop shape design that is constructed mainly of PVC pipe and plastic. The building materials are what make this such an inexpensive design.

The site offers very detailed instructions on how to construct this greenhouse and a detailed list of all materials needed.

This greenhouse could help those needing it for only a few plants. You could also build a multitude of these greenhouses in the place of one larger one as they are mobile.

Dimensions (feet): 5 x 12

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14. The Tomato Fort

This greenhouse costs about $50 to build. This is not a kit.

It requires different materials to be purchased and put together to build this little greenhouse.

The reason it is named the tomato fort is because the person that designed this intended it to protect her tomatoes from a lot of rain.

Tomatoes do not like rain. It is actually better to water them from the ground.

So she built her tomatoes a little fort that can be opened on the sides during prettier days and closed on rainy days.

It is a hoop construction that is mainly made from PVC pipe and plastic.

The site provides a list of all the materials needed and detailed instructions on how to build. It says that it only takes about an hour to construct.

Dimensions (feet): 8 x 3

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15. The Garage Greenhouse

I called this one the ‘Garage Greenhouse’ because it kind of works like a garage. It is actually a very original and unique design.

You place all of your plants up against your house. You can even create a little garden next to your house and add some shelving for your potted plants.

Let them grow in this convenient spot. However, when it gets cold you’ll have a greenhouse that can be pulled down over them.

This is obviously a cold frame style greenhouse but is really neat that it can be folded back when it is not in use.

This would be a great option for someone with a smaller yard that may not want a greenhouse freestanding all year long and taking up unnecessary space.

Dimensions (feet): 8.25 x 5

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