20+ Best DIY Greenhouse Plans on the Internet

This charming gable roof greenhouse has been built thousands of times by DIYers around the world—and for good reason. With its classic style, smart design, and simple construction, it’s the perfect backyard dream come true.

Building your own greenhouse is something you can tackle and save a ton.  We built this greenhouse about fifteen years ago, and it still looks brand new and is as sturdy as ever. This amazing plan has been built thousands of times by people everywhere.  Featuring a unique design to make it easy to build and sturdy, see why this greenhouse plan is so popular.

This greenhouse is roomy, measuring 12 x 16 feet at the base.  The height is about 10 feet overall, including a floor if using.  This greenhouse plan uses standard lumber and framing techniques, and is completely enclosed, so it's dry inside and easy to maintain.  We used twinwall polycarbonate panels - this plan is optimized for attaching these panels.  The door is sized for a standard storm door.

"Lean-to greenhouses offer a budget-friendly alternative to stand-alone greenhouses. Built next to an existing structure, you get space to cultivate plants while saving on building costs." Empress of Dirt did a magnificent job modifying our DIY Barn Greenhouse Plan for this one!

Keep the critters out with this enclosed garden design!

"We based the design on plans from Ana White's DIY Greenhouse but altered the roof line (I love the barn look!) and some of the supplies since we wanted an open air “greenhouse.” 

The design plans are stellar and include ALL the wood and tools you will need for the framework so we knew exactly what to get."

This charming greenhouse packs a punch with it's 5'x8' footprint making it focal point of the garden with plenty of room to grow year around!

Turn your raised garden beds into a greenhouse easily with these simple step by step plans! We love how it's totally enclosed and raises up to access your crops.

Build your own garden enclosure and keep your plants safe and contained! The ideal wood choice is cedar.  If you don't have cedar or cedar is too expensive, you can use regular framing lumber.  We recommend douglas fir if possible, treated with a non toxic exterior stain or oil (ask at your local hardware store stain for raised beds).

Create a garden bed with a hinged top using basic lumber and pvc pipe! This smart design will keep the critters out, won't take up a lot of space and easy to customize!

Low on space or need a little extra growing space? How cute is this mini greenhouse! "What is great about my mini greenhouse is that the roof folds back, and you can let the plants get air and sun during the day.  It also prevents them from getting too hot during the day and burning up."

"You can learn to make your own old window greenhouse with the help of today’s guest blogger Chris Peterson. Chris is the author of the fabulous book Building with Secondhand Stuff: How to Reclaim, Re-use & Upcycle Salvaged & Leftover Materials and this upcycled greenhouse is just one of many inspired projects from the book." Be sure to click over and check it out!

This darling sweet pea model is the perfect set up for a small closet sized greenhouse. The Hillside Market has multiple plans to choose from, just as darling as this one, check them out! 

"This DIY mini greenhouse is great for small outdoor spaces! It only takes up a few feet, and has removable shelf slats for taller plants." This would make a great seed starter shelf indoors too, just add grow lights!

"A simple cold frame is just what you need to get more out of your garden, from getting an early start coming into spring to extending your growing season well into fall and winter. Cold frames are easy to build — you can make one in an hour or two — and the materials are inexpensive." An easy addition to get the growing season started sooner!

How cute is this!

"Does anyone else have a penchant for anything that is miniature? I have always loved conservatories and greenhouses, but seeing as they are normally quite large and would take a lot of effort to build and maintain, I had a thought to create my own mini version! With the popularity of indoor plants rising and the troubles some of us have in keeping them alive, how about keeping the smaller and more delicate ones in a mini greenhouse instead?!" 

We love the simplicity of this one, perfect size for the deck! Pallet wood or cedar fence pickets make it even more economical. Plus its easy to modify for size!

This greenhouse folds up or collapses for the off season.  Plans are a PDF download with lots of photos from Rockler.

Very detailed plan to build a cedar greenhouse with video.  

Not a detailed plan, but great step by step photos showing the build process of a hoop greenhouse.  It's always easier to start with a square base!