I have long thought about building a temporary workbench that I could permanently mount on the wall but fold up when not needed. Being that I plan to use the bench I wasn't interested in spending a lot of money on cosmetics.

I put some thought into how I wanted to do this and it will be subject to change as I do use it and find it's weak points. To start with I bolted a 2x4 to the wall using lag bolts into studs. I had some old 2x4's I recycled from a remodel job. The bench top will rest on the 2x4 when in use. Remember to level this 2x4 as it will be the foundation of your bench.

The top is an old door, recycled from that aforementioned remodeling job. It is a hollow core door because that I what I had, If I were buying a door, or had the choice recycled, I would use a solid core door. The hinge is called a piano hinge and it is 72" long with the door being 80", It took about 80 screws to attach both pieces with the hinge. I used #8 x 1 1/4" cabinet screws, they have a larger head to prevent pull through.

The legs are just more recycled 2x4's cut to length. I have the height up to a level that is comfortable for me to work on standing up. This makes the legs longer than 40", so they would hit each other as they fold inward. I notched the ends of the legs to clear when folded. To ensure nothing rolls off I used a level side to side and front to back to ensure the top sat level. I used a normal door hings on each leg to allow it to fold inwards. I can lift the top, grab one leg and fold it in, then hold that leg and top up with one hand and fold the other leg up, then lower the top and it will swing in towards the door and hang up against the wall. See the first picture.

What if I am in the middle of a project and I need to finish it another day? This is normally where my tool cabinet rests when not in use. The height I have it at is tall enough to roll the cabinet underneath it for days when I need to leave the bench up.

Since this is where my cabinet normally rests and there is no need for me to fold up the bench, I have an old canvas tarp I throw over it to tidy it up. The cabinet on the wall on the right is the PPE storage box. Safety glasses, ear protection, gloves, etc. I know it says first aid, but it is not. To the left you can just see the corner of my dry erase board that I use to track things on my project. I write on it with a grease pencil as dry erase will erase way too easily. Grease pencils are also known as china markers and until I found that out I couldn't find a grease pencil anywhere.