Job description

We have a wall in our lower groundfloor/basement living room that had 2 damp patches on it when we moved in. We had hired someone previously to take a look at it. They said they could not find the source and that it was a one off leak. They applied damp proof plastering on the patches & applied a fresh coat of paint.

Now, 3-4 months later, the leak seems to be back & is showing AROUND the damp proof plastering. The paint is bubbling in some places and turning powdery in others.

We need someone to come and detect the source of the damp/leak and then fix it. We also need someone who will guarantee the detection and the fix for atleast 3 years.