The cost of concrete has gone up in price and out of reach for many buyers!
American-SteelGarages.com (aka ASG) can anchor your steel building to concrete, or gravel, dirt, and blacktop.
There are other options!
Some customers are going with crushed concrete for their site prep, and we can mount your Steel Building on that also.
Then after your building is up, they water down the crushed concrete which sets up like concrete.
Others are adding paver bricks inside after the building is up. (use styrofoam as a expantion / contraction barrier around the inside of building.)
Some are asking about pouring concrete inside the building frame after the garage is up.
If you do that, make sure to put a styrofoam or wood framing around the inside of your garage to keep the concrete away from the steel base rail as fresh poured concrete is acidic. Plus using the styrofoam or wood frame act as an expansion / contraction for your slab.
Tell the concrete guy, you got options!

Options are at buyers disgression, no warranty implied.