I just bought a home that was built in 1889. The basement is currently finished but has a lot of water damage. The drywall and panelling are warped and there is some mold present. However, the basement does not smell damp and I have not seen any water. We want to rip out all the finishing in the basement, seal the stone (limestone or sandstone I think), and refinish it. We also plan on re-landscaping to slope away from the house. The floor has drains but there is no sump pump (which may be banned by our city).
My question is, how do we seal the basement? We would prefer to do it from the inside because digging up the exterior may cause damage to the integrity of the foundation. If we had someone seal it for us, how much can we expect to pay?