Adding a floor to garage

Hello all,
This is my first post here. My wife and I purchased a house that was built in 1920. It is great, but it has a detached garage that could use some work. It has a dirt-floor and over the years someone has filled half of it with a home-built storage container. This storage container is completely drywalled in and lifted up on it's own subfloor.

I thought about initially tearing the whole thing down and pouring concrete, but the garage isn't really feasible to use as a garage due to limitation of access via the driveway. (It's all the way in the backyard and you wouldn't be able to get a car through the fence.

So, I have been thinking of using it as a detached office, but again, it has a dirt floor. Instead of pouring concrete, I was thinking a cheaper way to make this a work-able space would be to just tack together some subfloor raised around 4" off the ground and put some cheap carpet or laminate down.

Am I just asking for trouble? Should I just work on getting it filled in with concrete?

Thoughts?

 

Concrete would be better however you could use wood. You will need to run pressure treated floor joists. I would do it by running ledger strip around the perimeter then attaching the joists to the top of it nailing them into each wall stud. I would also use pressure treated plywood and for a good measure put a moisture barrier down.

 

i vote concrete. You might want to use it as a garage or store a car in it eventually. One of these days you are going to say why didn't i put concrete down instead.