So about half of the houses in my neighborhood have this step in the garage. It is 3 1/2" high 4' deep and runs the length of the garage. My wife and I just bought a new car and it doesn't fit with this step in here. Is it possible to break this out and resurface the floor? Is it a difficult job to do n your own or should I leave it to the pros?
I designed and built numerous homes with that step. It was fashionable and served a few purposes. Some places required it.
It keeps snow and rain and spilled gas (And gas vapors) and oil in a depressed area relative to the rest of the house. It also served as a stop, to keep you from driving through your garage wall.
It created a raised area for storage, also away from snow and water etc.
And it served as a step, reducing the distance between garage finished floor level and the house finished floor level, thus usually eliminating the need for a small step that would take up room, and be dangerous to use.
How difficult it will be to change, depends on how it was installed. It could be twice the thickness of the rest of the floor slab. That would make removal and replacement more difficult.
But if I was the installer, I would have left finished grade higher in that area to save concrete.
In any case, you are going to have to saw cut and demo and remove this area of the slab and then excavate as needed and re-pour the concrete floor in this area. Chipping out and resurfacing isn't a reasonable option.
The question is what kind of slab do you have? If it is floating, with the walls on a separate foundation, you can just rip it out. If the walls are built on the slab you will have to saw cut the perimeter.
Since it is difficult to saw-cut right along the existing exterior walls, you may end up with a small curb there.
Your best thing is to look at all your options.
You maybe could add on to the front of your garage or even add another bay on the side or front. You might could build a whole new garage and shop, elsewhere on the property.
Or you could just demo and re-pour in just the minimum area required for this one car.
Bill