Looks like an easy task but you may need to fill in a few blanks.
How is the exterior wall built below that floor? Poured Found? Stick built? How thick?

What is the "band" material on the front? 2x12? 10? 8?, Surejoist with plywood filling the inset?

 

The wall below that floor is cinder block. On top of the cinder block I am guessing is 2x12 based on what I have seen from the ceiling in the basement...which is finshed. I was able to find an area that I could poke my head up and look around.

 

Carl; The absolute first thing to do is get a structural engineer involved.
At first glance I have to presume the following: the finished level of this is to be level with the interior floor?
2: probably then close it in as an addition.
3. All being likely the span of 24' and wanting NO support underneath, means the size of the "joists" require TJI's of a width that way exceeds the current width of the band joists on the house. This means that you will have to open this building above the band and BELOW the band into the first level to tie all this into the building. This is going to be very expensive but if money no object is doable.
4: I truly hope that your statement of "cinder block" is a figure of speech, if not:{:{ load factor of cinder block very poor.

 

Any posts allowed? Like porch posts?

 

Posts may be an option but not one I'd like to recommend as it would hinder the porch.

How about a cantilever and beam combo? I can definitely get into the flooring in the living room and cantilever joists out to work in combination with the beam joist at the end.

 

Carl; Not totally shure but I believe cantilever requires either 4 or 5 to one. On the front rim joist or double possibly I dont think u will be allowed to just lag bolt the hangers I think you will have to thru bolt them. Engineer is a MUST and talk to building inspector as to his requirements. I would do inspector first then take his requirements to engineer, you are really into a furball if you dont cover all your bases b4 u go farther with home owners. There is NO way to cheap and fast on this:no::whistling

 

Is that gonna be bearing a roof or is there already one over that part of the house? Is there room for floor trusses?

 

It will be bearing a roof. There is already one over that section, but it will be modified into an A frame type roof.

 

beam

The structure depends primarily on the roof design which you don't show and I don't understand how an A-frame roof would be used here.

24 ft is not a long span for an engineered beam like triple LVL's if the corners can take the vertical loads.

Go to a lumberyard with a scaled and measured drawing showing the complete loading condition (especially the roof) with photographs and have their LVL supplier size the beam and give you a stamped drawing or letter for the building department.

Pay close attention to the bearing and connection requirements.

 

Thanks. I've decided to bring this one to my engineer for a look over since the roof plays a role.

 

Carl, I would definetly follow up with an engineer. It looks to me you can carry a cantilever for the whole thing. The span is 3 to 1 so 15 ft in will give you 5 ft out. How ever if there is a roof being supported here you will need to do something similar to cieling or some enormous beam, maybe steel to span the 24 ft. I have an inspector license and although every town is different I am certain the town inspector will not even bother with this unless you have an architect or engineer sign off. They usually wont make any suggestion for liability issues.