Relay internal concrete floor

nj78

We have a few problems with the floor in our kitchen/dining area. It is in an extension to the original house (approx 35 m2) and was built in 2 parts in the 70s and 80s. One half has a tiled floor and the surface is very uneven and bumpy, so there are broken tiles all over the place. The other half has damp problems (the structural engineer doubts there was any damp proofing and thinks it may have been built on the original yard). The sellers had plywood fixed on top of the concrete floor and lino over that, which I presume was a temporary measure to stop the damp coming up, and would be replaced every few years... Also both halves of the floor are at a slightly different level.
My initial thoughts were to get the whole concrete floor taken up, and basically start it from scratch, damp-proofed and relaid with concrete. However, budget is a big consideration so I wondered if there are any other options, i.e. could the current floor be salvaged by some means?
Also, would like to hear thoughts on underfloor heating. Is it costly, efficient, worthwhile, etc? It is quite a large area with only one radiator and was probably poorly constructed, so we may need to add heating of some sort. What sort of flooring can be put on a floor that has heating underneath (e.g. will wood flooring warp?)

Thanks,

BryanF

forget underfloor heating unless your willing to deal with insulation at floor and wall and associated junctions.

there is very little you can do with the floor unless you dig it up and damp proof as best you can. the external levels, water pipes, foul pipes etc is a consideration in this also