12 Free DIY Greenhouse Plans

DIY Barn Greenhouse

This free greenhouse plan is for a barn-style greenhouse that will help you grow your plants while looking stylish with its sturdy corrugated metal and greenhouse plastic sides. You should choose this greenhouse if you're looking for a beautiful structure and have the land to do so.

The free greenhouse plan includes photos, diagrams, a materials and tools list, written instructions, and videos.

Barn Greenhouse from Ana White

GeoDome Greenhouse

Northern Homestead has shared its free plan for building its GeoDome greenhouse. Use this plan and you'll get a multifaceted, geometric greenhouse that's lightweight yet secure, absorbs lots of light, has a lot of ground growing space, and makes quite a statement. There's a materials list, tools list, written directions, diagrams, and photos to help you build it. This option is great if you are looking for a portable greenhouse that requires no permit, yet is also stable in heavy weather and absorbs light well.

It also has other posts on its greenhouse about how to arrange plants within it, how to cover it, how to add a hot water tank and more.

GeoDome Greenhouse from Northern Homestead

Greenhouse With Sleeping Loft

If you're feeling ambitious, then this free greenhouse plan from Mother Earth News might be just for you. You'll get a completed greenhouse that's solar-heated and even has a sleeping loft, which almost makes this a tiny house. This rustic, bungalow-like greenhouse would be ideal if you are into the idea of your greenhouse doubling as a guest house, or if you would like to use the loft area for extra storage.

Scroll through the pages of this free greenhouse plan to find a materials list, images, and directions for building this great-looking greenhouse, all for under around $4,000 even with purchased materials and some hired helping hands.

Greenhouse With Sleeping Loft from Mother Earth News

Polythene Greenhouse

This free greenhouse plan by BuildEazy is conveniently built out of mostly 2-by-4-inch wood studs. Click through this free greenhouse plan to find shopping lists, directions, and diagrams. There are also photos of the greenhouses built by other readers who have used this simple greenhouse plan.

Choose this greenhouse if you do not have severe winter frosts, as it is lightweight and held into the ground with stakes. You can also make easy modifications to this greenhouse, according to the designer to customize it to your needs.

Polythene Greenhouse from BuildEazy

14-Foot Greenhouse

HowToSpecialist has a free wood greenhouse plan that will only take you a few weekends to build. Included in the free greenhouse plans are a materials list, diagrams, tools list, and tips. The style of this greenhouse is simple, with a frame entirely made from wood and an additional peak at the roof, which features two windows on either side of the upper region for ventilation.

Before you begin building, you will need to level the ground. This greenhouse works well in an area that gets ample sunlight and can be built durable with the right materials, such as pressure-treated lumber or cedar.

14-Foot Greenhouse from HowToSpecialist

Recycled Window Small Greenhouse

Instructables has a free greenhouse plan that uses a unique building material—old windows. It's one of the most affordable ways to build your own greenhouse if you can scavenge up a few windows that are about to be tossed.

Use all different shapes and sizes to make a bold statement that really creates some interest. It creates a great-looking structure that's environmental and budget-friendly. There are lots of color photos and written instructions to help you build one for your yard.

Recycled Window Greenhouse from Instructables

DIY 16-Foot Greenhouse

This free greenhouse plan by HowToSpecialist will give you everything you need to build a 16-foot-long greenhouse that is perfect for your backyard. You'll be able to grow your own vegetables, all year around with this DIY greenhouse. This free greenhouse plan includes lots of diagrams and illustrations along with written instructions. Select this DIY greenhouse plan if you are looking for a little extra space, but also quick assembly and a lower-budget project.

16-Foot Greenhouse from HowToSpecialist

DIY 10-Foot Small Greenhouse

Here's another free greenhouse plan from HowToSpecialist. This plan for a small DIY greenhouse is perfect for a small backyard. If you'd like to have a bigger greenhouse, you can adjust these plans for your space. It's a pitched roof with a door, giving everything you need for a successful greenhouse.

You can use the written instructions, materials, and tools list, as well as tips and diagrams to build this greenhouse.

10-Foot Greenhouse from HowToSpecialist

Little Window Greenhouse

Make a DIY greenhouse budget-friendly with free materials you thrift. This free greenhouse plan from Crafts a la Mode takes some old windows and makes them into a greenhouse just big enough for a few plants. It's a gorgeous greenhouse that doubles as yard decor.

The best part is that you can easily add more windows to make this larger if you'd like. It's certainly a unique look that's going to look great in any yard. There are lots of photos taken along the way to show you how to build it. This is an easy project that even the beginner can handle.

Little Window Greenhouse from Crafts a la Mode

Arched PVC Greenhouse

Here's a free plan by PVC Plans for an arched greenhouse that uses PVC pipes. Download the free greenhouse PDF plan and you'll get a material list, diagrams, and written directions. This is a great starter greenhouse if you're just starting to experiment with growing in a greenhouse.

PVC pipes are also pretty affordable and using them is a budget-friendly way to build a greenhouse. This greenhouse is arched and includes two doors, one in the front and one in the back.

Arched PVC Greenhouse from PVC Plans

32-Foot Greenhouse

FloridaGardener.com has a bigger greenhouse plan that you can print and use for free. A combination of wood and PVC pipes are used to build this large, hooped greenhouse that's 32 feet by 10 feet by 10 feet. Though, it is easy to add or subtract square footage to or from this large-yard design to suit your needs exactly. The half-cylinder shape is vapor-tight and features an opening on each end for ventilation.

There's plenty of room for all your plants and vegetables and you won't have to worry about outgrowing this greenhouse anytime soon.

32-Foot Greenhouse from Florida Gardener

DIY 8-by-10-Foot Greenhouse

BuildEazy has another free DIY greenhouse plan, this one builds a large 8-by-10-foot greenhouse that you'll be able to fit all kinds of plants into. This design is a great option for a gardener looking for some extra ventilation, as the entirety of the upper roof portion is made up of windows that can crack open. It has a good amount of storage with shelves on either side. There are 13 pages in this free plan that includes drawings, photos, diagrams, and instructions on how to build it.

8-by-10-Foot Greenhouse from BuildEazy