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.


Ron Ortoli (not verified)

Sun, 05/20/2012 - 19:46

This looks easy to build, we like the basic structure, but may use corrigated plastic panels on the sides as we live in a cold area of vermont.

Carol H. (not verified)

Wed, 05/23/2012 - 20:17

Hi Ana: I too would love to see this plan as a shed but a bit smaller.

I also wondered about the venting. I don't think that it could be used during the hot summer months around my parts. Then again there is such a product as shade cloth.

Dianna (not verified)

Thu, 05/24/2012 - 00:54

I'm in Alaska too and I was wondering what it cost to build this. I also want to be able to grow stuff like tomatoes, peppers and herbs. We have done cold frames made out of pallets but I would like to build a greenhouse.


Thu, 05/24/2012 - 19:30

As I was reading the plans I was trying to figure out how to make it a shed. I would love to see the plans.
Thanks Ana for all you do. I started building a few weeks ago and dont want to stop.

Aida Nieves (not verified)

Fri, 05/25/2012 - 11:41

Love this , just emailed it to my hubby in hopes that he gets inspired to build this for me as i love to garden and this is perfect ... thanks for sharing .

Darlene (not verified)

Fri, 06/15/2012 - 21:45

I noticed that you placed the clear roofing side ways on the greenhouse instead of placing it vertical so that the rain and snow would run off faster. Did you have any problems during this last winter in Alaska with the snow load? I built a similar shed last year and the roof was strong enough for all the snow this year. Here are the plans,


Greg (not verified)

Wed, 06/20/2012 - 06:50

I agree with Darlene. The ribbed panels need to be vertical to shed water. With your horizontal panels the water will run to the ends and then soak into the wood framing. I would expect the wood at the front and back of your greenhouse will begin to rot sooner rather than later.

HILDA (not verified)

Mon, 07/02/2012 - 17:54

I am new (just today) and have seen some of your plans. I am awed!!! But when I saw this... OMG... I was in love. I have been wanting a greenhouse for quite a while now and this is actually something attainable for me. Thank you so much for all your sharing and keep up your wonderful work.


Sun, 07/29/2012 - 18:12

I would LOVE to see this as a shed. How hard would it be to make it two doors wide and a bit longer? This looks like just the shed we need for all our gear for our trips :) always an Ana Fan!!!!!

Craig C. (not verified)

Fri, 08/03/2012 - 08:48


Where did you get the ribbing strips for the corrugated? I would like to build your shed / greenhouse and send you pics! I already have the space and we are leveling now!

Free Plans Made Possible By Our Sponsors