DIY Greenhouse

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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!

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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!

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 :)


Thu, 05/17/2012 - 16:09

I of course would have no idea of how to do this on my own. Yet another reason you are loved by us all. I will totally be building one of these instead of buying when I get my spot of land!

Emily Frazier

Thu, 05/17/2012 - 19:15

Isnt it really nice to get what you want for mothers day. Ana I am so glad you finally got your greenhouse. I got a stanless steel laser miter saw. Now I can build almost anything, got my Kreg Jig for Valentines. Cant wait for my birthday next month. I am thinking air compressor. Keep bringing these wonder projects. I talk you up to everyone I know. Send them to you sight. Thanks for being an inspiration to all the women that think the could not come out of their comfort zone and create.



Ana White

Fri, 05/18/2012 - 10:54

Thank you everyone for your wonderful comments! This was actually a very easy project! We ourselves couldn't believe how fast it came together.

We asked locally what people do for venting and most people said on a small greenhouse, having the door open provides enough ventilation. But if we find we need more, we can always add vents.

At this point, we are just looking for a greenhouse to grow tomatoes and cucumbers and herbs and peppers - just extending our growing season a little on each side. But we would at some point like to consider a true arctic greenhouse and I love the suggestions of creating thermal mass. Really got me thinking! Thanks for the input, we really appreciate it!

We designed this plan so it's exactly 48" on the sides. Anyone like to see this as a shed too???? I'd love to modify the plans!

Thanks again for reading and commenting!


Fri, 05/18/2012 - 21:41

I was just thinking how great this would be as a shed. I would love to build a space where I can store my tools and "play" with them too. Thanks Ana!

Bryanna Djibril (not verified)

Wed, 07/11/2012 - 10:26

You are, as always, impressive! I would LOVE to see this as a shed! We really need one and my husband loves this design.

Thank you!

Randy from Bla… (not verified)

Tue, 12/11/2012 - 17:13

I'm searching your newly found site now (found by googling loft bed) for a shed, and saw this.

I am curious how the clear corrugated siding is holding up (did you only build this in May 2012?).

Kosodate Farm (not verified)

Fri, 05/18/2012 - 14:27

Hi Ana,

I'd like to see this greenhouse with a smaller footprint . Any outbuilding over 100 sq. ft. would require a permit in my city.

Thanks for the plans! This the the perfect fall work party project!

In reply to by Kosodate Farm (not verified)

Ana White

Sat, 05/19/2012 - 12:36

Hi! The easiest way to do a smaller footprint is to just make it 8 feet long instead of 12! Then you just buy 8 foot sheets of tin and greenhouse plastic, make the side walls 8 feet long instead of 12, and drop 2 sets of common rafters. Super easy mod and would get you just under 100 square feet :)


Fri, 05/18/2012 - 17:52

This looks about just the right size for my greenhouse!

I'll be curious to see what you do for winterizing it. Maybe use bubble wrap in "ceiling?"

Looks like it would support the snow load and I am thinking about heating with a fish tank -- about 500 gallons of warm water should be able to keep the veggies growing... and allow me to harvest fish too!

Thanks Ana!!!

In reply to by Kosodate Farm (not verified)

Ana White

Sat, 05/19/2012 - 12:31

Hi! The greenhouse isn't that heavy - we moved it by putting it on a trailer and then taking it off with just my husband and father-in-law. The best option is to build your trusses and walls on a flat level surface, and then assemble and add the tin and greenhouse panels in place.


Sat, 05/19/2012 - 15:43

I would love to see this as a shed. We don't have a garage and need to build a bigger shed to store the snowblower, bikes, tools, etc.

llconcloud9 (not verified)

Sun, 05/20/2012 - 19:33

I love this idea! And the step by step plans are wonderful! Can you give me a guesstimate of the cost to build this they way you built it?

nan harp (not verified)

Sun, 05/20/2012 - 19:39

About how long timewise was the project? What was the rough cost of materials?

nan harp (not verified)

Sun, 05/20/2012 - 19:43

About how long timewise was the project? What was the rough cost of materials?

nan harp (not verified)

Sun, 05/20/2012 - 19:45

About how long timewise was the project? What was the rough cost of materials?

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!

Kim from Texas (not verified)

Sat, 08/25/2012 - 17:08

Well now, that's about the cutest lil greenhouse I ever did see! My husband and I were inpsired. We bought the materials and we'll be constructing the "lil cutie" next week. I read the post about the horizontal placement of sheeting along with the one on venting. Snow is not an issue in our part of Texas but we do have lots of rain. We are using environmentally recommended treated lumber for the entire project. I will take notice and comment how it holds up over time. (I do not think it'll be a problem) We will, however, need some sort of venting for mid summer as it's disgustingly hot down here. However, we thought the plan was laid out perfectly fine for our needs. We will figure out the venting problem next summer. I'll let you know how it works for our weather and I'll post a link to your site onto our site along with pics after it all said and done. Thanks again!! The Reshards

In reply to by Kim from Texas (not verified)


Mon, 10/14/2013 - 13:03

Seriously...the Gambrel framing is great however Ana got it all wrong with the corrugated polycarbonate (not corrugated glass as she stated). Rain or snow it will rot the wood eventually because water will leak in. Also she should have used foam gaskets/inserts instead of wood. Wood will rot.
Here's a link for Lexan Corrugated Polycarbonate panel installation

Actually the metal side walls should be vertical as well.

Vi Wood (not verified)

Fri, 09/07/2012 - 09:19


Can't thank you enough for the plans, we've been looking for some plans for a long time now.
However I will build the greenhouse double length, I need a larger greenhouse and will make the pitch on the roof steeper.

A vent is a must and if I need heat then I will build one of this solar panel:…

Good luck planting your dream garden.

Liv (not verified)

Sat, 09/08/2012 - 19:01

This is amazing! Thank you so much for sharing the plans and sharing the knowledge to the community out here! We appreciate it. I know what you mean about putting things off until you decide "why not RIGHT NOW?" That's how I've finally started getting things done!

I miss Alaska like crazy; I love living vicariously through other people's blogs!


Heidi from the… (not verified)

Sat, 10/06/2012 - 15:53

Hubby and I want to have a green house really bad and this just might fit the bill.
Wondering if you secured it to the ground? We get wind storms and I know that it blew away one of those metal kit garden sheds you can buy.

NormaJean Mahar (not verified)

Sun, 10/07/2012 - 10:38

I really like the looks of this greenhouse. It also looks easy to build. What I have a question about is, shouldn't the plastic greenhouse panels be turned the other way for people who live in the Northern climates where there is sometimes 1-3 ft. of snow? Othen that I really love this idea.

Guest named Gary (not verified)

Sat, 10/13/2012 - 07:10

Nice page however it's unfortunate you attached the corrugated polycarbonate horizontally which is not recommended by Sabic, Sun Tuff etc. The panel should be
installed with the hills and valleys aligned vertically. This allows snow ( I would imagine in Alaska you get plenty of snow) to slide off the roof and looks a lot better. See greenhouses at to see what I mean they use Lexan Corrugated I purchased on a few years back.

Jack and Pams Place (not verified)

Fri, 12/07/2012 - 05:15

Hi there, I am semi retired and my wife and I are looking to open a small Business on our 30 acres. We both love gardening and making candles, birdhouses and such. I am curious about the greenhouse plans I found of yours while searching. I see people asking about a smaller version but what if I make it say, 20 ft long? Just adjust the measurements as I would with the shorter version I would think. I would like to attach a shed, store to it and it looks like if I build the trusses closer together it would take the winter snow. I may just make the outside walls higher for the head room and butt the greenhouse to it. Any thoughts? Am I on the right track with it? Thanks in advance, Jack and Pam

teresa hansen (not verified)

Sat, 12/08/2012 - 08:28

hey ana the green house looks great i just have a few questions 1. Im relatively new at this and my husband and sons and ok me we built this beautiful green house frame out of angle iron and outside out of plexiglass we snagged a deal at the local restore from habitat for humanity but the plexiglass is not durable on the outside so we r going to have to replace it with that corrugated stuff you have on yours,Im curious if it islong lasting in the conditions up there in alaska and we were thinking of angling it the other way so as to allow the snow here in utah to fall off the roof but still not sure give me your best synopsis please. 2. also the heating and cooling we only need it for maybe a 6-8 weeks prior to planting so the best possible economical outcome that you have found woud be most helpful. excited spring planter Teresa!