Unwanted raised 4" concrete slab bathroom floor
Our home is built on slab with an extra 4" slab at one end of our bedroom upon which sets our bathroom vanity area and toilet. The entire vanity area is open to the bedroom. You walk down into a large shower area shared by the toilet, which has a door. We wish to remove this raised slab area to house floor level. Our bedroom is 15x15' and this raised area at one end of the bedroom is 8x14'.
Would it be likely that the raised concrete slab is part of the foundation, or probably poured later and is a separate piece of concrete? Is it possible to remove this concrete? We also want to lower the toilet. Several houses in our area have these raised concrete slabs or step down living rooms. Our home was built in 1978.
Thank you for your input.