It sounds like your experience level is such that you'll need a general contractor, whatever you do. So start out by considering how much more space you need and what you'd want changed, then get some estimates. Costs very regionally, but as a ballpark guess, figure about $100-150/square foot to expand the existing home. This assumes that it's structurally sound and that the existing structure doesn't require any major renovations/repairs. If you're just adding bedroom/familyroom space, maybe $80-100/square foot. Kitchen and bathroom renovations are more expensive because of the materials used (some kitchen run well over $500/foot)

If you're able to do a lot of the labor yourself, you might cut those costs by a 1/3rd or more. When I was 14, my family expanded our 3-bed ranch up and out, adding a second floor and over 2,500 square feet. My dad was an engineer, so we were able to eliminate ALL non-material costs, including design and engineering. We did everything ourselves except for pouring the slab, and our total cost was less than half of the contractors bids.

A concrete slab is, in fact, a "real foundation". If expanding the existing house, you can pour additional slab to expand the "footprint", or you can "build up", adding a second floor (an older home may require reinforcing of the slab foundation to support a second floor). If going with a modular home, it can sit on the slab- any part of the slab that's not covered by the new house becomes your patio.

Demolition costs vary regionally, and, obviously, by the size of the structure. But figure around $10-15,000 to have the entire house taken down to dirt - maybe $5-8,000 to demo the house but leave the slab. You might save $2-3,000 if you do a lot of the tear-down yourself.

What I mean is, Is it because the wood is exspanding or the sliders need oiling or replaceing? if the wood is warped then you might need to Ask someone who knows if you need new wheels or sliders then you can do that your self. but Oil them first that is what I would do. Hope I helped

you should renovate it. the price for a mobile home is very comprable to that of a stick framed home. the only advantage is that with a trailer you get an "instant house" the disadvantage is that it won't last nearly as long as a stick framed home. Luck with it.