Entryway addition question

[Robert Macejak]

Good Evening, My wife and I just purchased our first home that was built in 1973 with a 6' addition to the front of the house put on more recently. They used a thicker rebar in the addition so the floor has a slope to meet up with the rest of the home. We want to make it a raised portion with a step down into the living room. Is this a DIY'able project or do I need to call someone in? I believe we would also have to raise the door frame to make it match as well.

[Josue Vargas]

@Robert Macejak

This looks like an easy fix for an experienced floor guy.  I would't do it myself.  You have to tear down the plaster on that small room to the actual foundation/slab, and most likely is sloped towards the door.  

Few suggestions:

1. Remove the plaster on the floor and try leveling up, more than 2" leveling will required some topping with sand/gravel in order to avoid non-sounded surface. 

2. If the floor is actually sloping down towards that door, you may need to rise the door.  Carpet doesn't help to see the full picture. 

3. You have the room to make it work, but like you said, it will look awkward due to lack of headroom from the door to the ceiling.  Might as well remove the remaining wall and make it-up with some small glass paneling.  Rising the floor 6-8" seems a bit too much, current slope should be around 2-3% (translated to a max of ~1.5"-2.0" against the wall/door).

4. Roughly bust the surface of the current slab so there is roughness to adhere the new leveling surface (stay away with the self leveling stuff if you want to level more than 2")...