I'm looking for cost efective means to level our basement floor. We have a 1907 brick victorian home and the foundatioin has setlled which heaved the center of the basement floor. The floor is 3 to 4 inches higher in the middle relative to the perimeter. It is approximately 1500sf. I looked into removing and replacing the concrete floor but it was quite expensive. I inquired about self leveling concrete and this was quite expensive. My wife suggested possibly filling the lowspots with sand and then covering with a plywood subfloor. Not to keen on the plywood sub floor but ??? Any thoughts or suggestions? I'm DIY type and would appreciate any input now.