Has anyone ever removed or built upon an old house slab?

I wouldn't build anything on it unless it's some kind of shed or storage.

Who knows how well the original slab was built and it is almost a certainty the slab sustained damage if the original house burned to the floor.

I certainly wouldn't build a modern house on it.

Do the plumbing drains just happen to fall out where you want them? Seems hard to believe.

Id build next to it and plan for a shop or patio or something. 18k would probably pay for a large portion of what you want to put on it.

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Do the plumbing drains just happen to fall out where you want them? Seems hard to believe.

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Add to that, 35 years of drains being exposed to the elements----leaves, dirt, etc. and no telling how clogged they'd be to start with.

If you're set on building a house on that exact area, why not think about putting up a raised house using the old slab as the foundation to put the piers on. The outer part of the slab should have a concrete footing much thicker and deeper than the slab used for living area.

You could have a structural engineer check it out to see if that is feasible or not.

I just don’t want a raised house. I thought about using it as a shed but it’d be close to the new house.
With everyone agreeing that the old slab is not worthy of building on I’ll just remove it.

Thx for the advice. Hopefully can get a better removal price