DIY Greenhouse

Submitted by Ana White on Mon, 03/04/2019 - 16:31
| Print this plan

DIY Greenhouse plans - build your own DIY greenhouse, free step by step plans by


Building your own greenhouse is something you can tackle and save a ton.  We built this greenhouse about six years ago, and it still looks brand new and is as sturdy as ever.  We are happy to share our plans with you - see below.

Here's some photos of the build -

Near completion of the framing stage. We used 12' long pieces of corrugated metal roofing for the side walls.

We ran the corrugated roofing horizontal.  This was very easy to install and we have had zero issues with this design.

We also trimmed the corners out with metal flashing to make everything look nice and finished.

The greenhouse plastic wrapped right over the corrugated metal - like it was meant to be!

The only part that was slightly tricky was the ends - but really no big deal to add the greenhouse plastic panels.

Our DIY greenhouse turned out great and we are so excited to share the plans with you.

Please post a pic or share if you build!

Pin For Later! 

DIY Greenhouse

Greenhouse plans
Dimensions are shown above for the DIY Greenhouse. It's a good size for a standard family of 4 or 5


Shopping List
  • 3 - 2x4 @ 10 feet long - use on back wall
  • 5 - 2x4 @ 12 feet long - use on sides/ridgepole DO NOT CUT
  • 32 - 2x4 @ 8 feet long
  • 11 - 12 foot x 26" standard corrugated plastic greenhouse panels
  • 1 - 8 foot long x 26" wide standard corrugated plastic greenhouse panel (use on door side)
  • 3 - 12 foot long tin panels (use on sides and back)
  • 1 - 8 foot long tin panel (use on front)
  • Tin screws
  • 28 - 4' long ribbing strips
  • L flashing (optional for the corners)
  • You'll need either metal gussets for the trusses or to cut plywood ones from 1/2" plywood
Common Materials
3 inch screws
Cut List

Cut list is in plan at each step

Tape Measure
Speed Square
Safety Glasses
Hearing Protection
Kreg Jig
Circular Saw
Miter Saw
Drill Bit Set


Step 1

Back wall framing.  Cut 2x4s as listed below.  Screw together with 3" screws or nail together.

  • 2 – 2x4 @ 118 3/8”
  • 6 – 2X4 @ 32”


Step 2

Side Wall Framing - Build TWO

  • 4 – 2X4 @ 144”
  • 14 – 2X4 @ 32”


Step 3

Front Wall Framing

  • 4 – 2X4 @ 32”
  • 4 – 2X4 @ 42 ½”
  • 2 – 2X4 @ 81 ½”
  • 1 – 2X4 @ 33 3/8”

Build the front walls as shown.

Step 4

Attach the four walls together with 3" screws at corners.

Step 5

Step 6

  • 1 – 2X4 @ 117 7/8” (BOTH ENDS CUT AT 22 1/2" DEGREES, ENDS NOT PARALLEL)
  • 1 – 2X4 @ 55 3/8 (TOP CUT TO DOGEARED POINT, 22 ½ DEGREES)

The back truss is built same as front. See next step for close up of the center cuts

Step 7

This board was a little tricky to cut - practice first!

Step 8

1 – 2X4 @ 141”

NOTE: If you use gussets - we used 1/2" plywood - this will affect your ridgepole length. 

Step 9



  • 10 2X4 @ 47 1/4” (BOTH ENDS CUT AT 22 ½ DEGREES ENDS NOT PARALLEL) - shorter rafters go up to meet the ridgepole.  I marked all shorter rafters to avoid confusion.


For the common rafters of this barn style greenhouse, we ended up using plywood gussets to save money. After cutting quite a few, I figured out how to cut gussets the super quick and easy way - got gusset cutting down to less than a minute each.

We put gussets on both sides of each rafter joint with glue and screws. We made all of the small trusses first on the ground, then it was just a matter of stacking them on the ridgepole and attaching to the studs. We used 8 screws per gusset. Common rafters are installed flush to top of ridgepole and flush to outside of side walls. We had to "toenail" the screws in - meaning they are screwed in at an angle. We used glue and 3" screws from both sides.

Step 10

The plan will get you through the framing.

At this point, you could use plastic paper, lexan glass panels, you name it to seal the frame in.

We used the corrugated plastic panels detailed earlier for installation. IMPORTANT: If you do not use panels you will need some sort of lateral support to keep the greenhouse from swaying side to side. Try 12 foot long 2x4s. 

Finishing Instructions
Preparation Instructions
Fill all holes with wood filler and let dry. Apply additional coats of wood filler as needed. When wood filler is completely dry, sand the project in the direction of the wood grain with 120 grit sandpaper. Vacuum sanded project to remove sanding residue. Remove all sanding residue on work surfaces as well. Wipe project clean with damp cloth.

It is always recommended to apply a test coat on a hidden area or scrap piece to ensure color evenness and adhesion. Use primer or wood conditioner as needed.



Thu, 05/17/2012 - 11:57

My sister and I were just talking about greenhouses. I have always had a little dream of having one (gardening was my first hobby love). It looks great!


Mon, 02/15/2021 - 07:13

If you enjoy woodworking and are considering building some furniture or crafts, then TedsWoodworking collection of 16,000 plans isn't something you SHOULD check out, it's something that you would be insane not to... The level of precision saved me thousands of dollars and provided me the joy of building my own custom bookshelf. The wife loves it! here is the link to downlaod the entire "TedsWoodworking" 16,000 plans package.

Rory (not verified)

Thu, 05/17/2012 - 12:37

Love this! Just wondering about what it costs to build? Couldn't find it in the description.

Cindy from Indiana (not verified)

Thu, 05/17/2012 - 12:51

This project is awesome! I've been planning out how to arrange our yard - this is going to have to go into the plan. Love it!


Thu, 05/17/2012 - 12:52

Ana I am so glad to see the greenhouse finished. What a wonderful Mother's Day gift that was. Thank you for sharing the plans with us. Wishing you and your family lots of joy in your gardening adventures...Vi


Thu, 05/17/2012 - 13:01

Thanks Ana for the apron shout out, perfect for gardening in the greenhouse! Your advice proved perfect (and my husband wrong!) as we got both giant wall pieces in and upstairs no problem, just finishing up and I'll send you pics tomorrow.

BookladyDavina (not verified)

Thu, 05/17/2012 - 15:47

Very nice job on this. Will be looking at this as a possible basis for the one we need to build, though it will have to wait til next year (this year I'm more concerned about the master suite renovations we're in the middle of.. the old man who built our house ages ago didn't understand the difference between dry wall and and the waterproof greenboard.. so we've had to gut and redo all the bathrooms one at a time. we decided to take the necessity and turn it into an excuse to redo the master suite the way we want, but doing it ourselves, on the weeks hubby's home from the slope, seems to be taking forever.. and there was a lot i can't/couldn't help with for health reasons.. but it's getting there..)
Meanwhile, I have 2 lovely bay windows that I use as an indoor mini-greenhouse.. keep my tomatoes and peppers in those and they do wonderful.. I'm in Palmer, AK and I have to literally kill them off or they would keep producing all winter. had one that got left in the bedroom all winter and ignored.. it has come back and is covered in new bell peppers. it's crazy :)

Free Plans Made Possible By Our Sponsors