How To Build A Shed Foundations

A Short Illustrated Guide

This is just a quick kick-start guide. For other types of foundations or more detailed guides check the links at the bottom of this page.

In this short guide we will assume you are building a rectangle shed - like most outdoor storage sheds are. If the foundations of your shed will have more complex shape you should apply the same to each rectangle.

Step 1.

Measure a square area in your yard and flatten the ground if needed (some ideas here). The area should be few inches larger than the actual shed dimensions.

Install 9 deck piers - one in every corner, one in the middle of each side and one in the geometrical center of the foundations.

There is no need of concrete in the foundations especially if you have chosen a place with hard ground.

A rectangle area with nine deck piers
Installing a deck pier

Step 2.

Here is how to install the deck piers: dig a hole which is wider than the deck beam pier.

Fill the bottom few inches with sand and gravel and compact the filling. Put a paver over it to ensure stability

Center the deck pier and level it carefully.

Fill the hole with gravel and ground and make sure the deck pier is stable enough. You need to ensure there will be no water going inside.

If you need more info on installing deck piers, check this guide on Wikihow.

Step 3.

Attach three parallel beams over the deck piers as shown on the image.

Use nails or screws to join the parts. Make sure everything is aligned.

Installing beams in shed foundations
Installing joists over deck piers

Step 4.

Install as many joists as needed perpendicular to the 3 beams.

You may need to use secondary wooden blocks to stabilize the joists.

Make sure there is equal distance between the joists.

Step 5.

Attach two boards at the both sides where are the joist ends. This will fix the joists.

The edges of the boards must be aligned with the ends of the boundary joist.

The entire construction looks as a lattice as seen on the picture.

This forms a very stable construction.

You are almost ready!

Shed foundations as seen from the top
Attaching plywood

Step 6.

Cut a piece of thick plywood with the size of the shed bottom.

If you don't have a large enough piece you can use several small ones.

Step 7.

Here you go!

Use nails and screws to attach the plywood to each of the joists and your shed foundation is ready!

Shed foundations as seen from the top

Do you want to get started? I recommend you to check these shed plans, pick a model you like and go ahead!

Other Foundation Types and Guides

User comments:

RAY at Oct, 20 '10 21:45
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Bob at Nov, 11 '10 08:37
Just fixed! Thanks for your comment
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Check Also These Interesting Articles:

  1. Materials for Building a Shed
  2. Main Types Of Garden Fences
  3. Pole Shed: What Is It and How Can You Build One?
  4. Are Timber Sheds Better Than Metal Sheds?
  5. Attached Sheds

What Else:

1. Here's another more detailed guide on building a shed floor.

2. For better performance you may want to poor in cement blocks in the holes.

3. Plywood may attract rats and termites. Keep it dry and not too close to the ground. Paint it!