I have damp to the base of an internal partition wall. I believe the cause is manifold, but believe it is caused primarily by the fact the outside floor level is the the same as the concrete kitchen floor and that as the drain pipe discharges onto the external ground the water penetrates through the base of the wall into the concrete floor and then on to the internal wall. Now the obvious solution would be to lower the external ground until I find the damp course, if indeed the house has one, it's a Victorian house built on the base of a Georgian cottage so it may not. The problem is that the ground outside is a concrete path that runs down the rear of the terrace, it is a shared access path and runs in a single piece for the entire length of the terrace. I suspect it was laid on top of an older path and that's why it is too high, but if I was to just lower my piece I would be lower than my neighbours and without new drainage it might turn into a paddling pool putting more water against the wall. Installing a new drain might solve the problem, the SVP enters the ground through the concrete so a drain must lie below, close to the wall, I hope that's not the source of the damp, though under the new laws it would likely be the responsibility of the water company if it was. I know you're not meant to drain your roof in to the sewer, but there is nowhere to construct a soakaway as my garden is not contiguous with the property. If it was impossible to lower the path, what are my options? Is it possible to dig a trench and waterproof the wall on the outside then reinstate the path? What if I took up the concrete floor in the kitchen and tanked the wall before reinstating it with a DPM underneath? Though if I did that where would the water go instead? What if I took up the path, inserted a French drain at the far edge, sloped the path towards the French drain and filled above the trench with gravel. What is the closest to the house you can use a French Drain? The path is probably only 3-4' wide. Really unsure how to proceed with this.