Building a Shed under a Deck

How to build a shed under a deck. The following youtube video covers some important factors to consider when building such a deck.

I used 3dsmax to model my deck and shed.
I recently converted the 3D deck & shed plans into sketchup so that others can benefit.

Feel free to download the sketchup file and use Google Sketchup to view, measure, and modify my shed/deck plan for your own use.

FREE Google Sketchup Plans for my deck and shed.

Back in 2001 my new home needed a deck. I designed a deck that was small and simple.
The 2 posts and single beam were massive screwed and glued planks.
I am proud of the fact that I single handedly designed and built my deck.
It was a lot of fun figuring out how to lift that heavy, wet, pressure-treated beam onto the posts all by myself.
The posts weren’t small either, when you consider they are almost 6 feet underground!

Overkill should be my new middle name.

Designing my deck with only 2 posts, allowed plenty of space for a shed.
The first stage of building my shed was to build the roof within the joists of the deck.
This stage took a long time and a bunch of thought.
I decided to build an angled trough system with curved sheets of aluminum flashing.

Here you can see the underside and the gradual slope for rain runoff.

This was an incredibly tedious process. I used a large quantity of industrial caulk to seal the aluminum to the joists.
This tedium will be worth it because it maximizes my sheds headroom.
I’m 6′ 3″ and there is just 1″ of headroom from the joists.

The next time I need to cut bricks… I’ll get a diamond blade.
It sure took me a long time to cut them with an abrasive disc.

The shed roof survived the winter and showed no leaks. Now the next stage. I had a concrete pad poured. I decided to put my shed entry on the left side of the deck, so I had to dig the hillside down and create a patio for the doorway. This summer was incredibly hot and moving my sprinkler lines was no fun.

It’s took an eternity to figure out how to build the walls. I had to leave a gap between the walls and the deck. I expected the concrete to heave in the winter.

My excitement is building and I can see the light at the end of the tunnel!

The doorway is short and non-standard. I had to build a custom double door.
Another month or so would pass before I could finish my custom shed doors, but I’m happy with the result. I wanted my shed to look as nice as I could make it… so I wrapped it in matching vinyl siding. My trailer-lift project may have been my most gratifying project, but my shed has been the most useful. Good thing I allowed space for the concrete to heave in winter… because it did just that!

YAAA! My garage is clean and useable again.


  1. July 4th, 2014 at 05:24 | #1

    Building a storage shed under a deck is one tough job. Storage Sheds need to be built very carefully. For building a shed under a deck, you can screw sheets of corrugated metal or fibreglass roofing to the furring strips. This acts as a roof over the storage area. You can cut and install wood lattice around the deck foundation, so as to hide the storage area from view. For this purpose thicker lattice should be used, as it holds up better than the thinner lattice.

  2. Ethan
    September 2nd, 2014 at 08:37 | #2

    Did u used house wrap?

  3. September 2nd, 2014 at 10:08 | #3

    @Ethan, I didn’t use house wrap, but in hindsight it may have been a good idea. I’ve seen no signs of mold or rot and I don’t think there will be, since I was thorough with the vinyl siding installation. The shed still looks great, but my doors need refinishing now.

  4. Ethan
    September 2nd, 2014 at 12:53 | #4

    Thx, love ur shed. Buliding the same one right now hehe thank you for sharing. Just done with the roof, now working on the framing.

  5. February 6th, 2015 at 21:06 | #5

    Dear Alan,

    I have been surfing the internet while the snow flies and I enjoyed the blog.

    For longevity did you use an ice and water shield or rubber under the aluminum to protect the OSB? I am a deck and porch contractor in Massachusetts and our climate is similar.

    And since you mentioned it to another poster have you noticed any heaving of the concrete?

  6. February 6th, 2015 at 22:37 | #6

    @Boston Deck, Thanks… I didn’t use anything between the aluminum and the OSB, but there are no signs of any problems. It might be a good idea, but in my case everything looks good. The concrete heaves every winter … at least 1/2 inch and usually more. Since I designed a space between my shed walls and the deck… there has been no problem. I hope to refinish the doors in the spring and I will try to shoot some new HD video of the condition of the shed. Except for the doors… it looks as good as the day it was built.

  7. Scott
    February 12th, 2015 at 12:31 | #7

    I really appreciate that you shared this project. I’m going to build it this spring. I’m a Minnesotan exiled to Indiana for work purposes. One question, what did you use on the exterior of the rear shed wall?

  8. February 12th, 2015 at 13:57 | #8

    @Scott The inside wall next to the house is actually bare plywood. It was built tight enough to the house and the deck shielded it from the elements. The vinyl siding corners of the shed completely the obscure the ability to see the plywood.

  9. Brenda
    March 20th, 2015 at 09:09 | #9

    Thank you for the great blog! I too live in MI, a suburb west of Grand Rapids and have a similar home built in 2001 (bi-level). I’m considering this task but I was wondering if you had to pull any permits from your city/township to build the shed and if there were footage requirements for a stand alone structure? I think I read on my township website that it has to be so many feet from my home.

Comment pages
  1. March 20th, 2011 at 11:56 | #1
  2. April 13th, 2011 at 12:05 | #2
If you want a pic to show with your comment, get a gravatar!