Hi there,
My neighbour has done loft conversation and now I have a leakage in my rear side of the house where I can see the joining of old and new roof tiles is in my area

although from the chimney to the front joining is at the centre

but the back from the chimney is around 6 inches inside in my area from the main wall. I have confirmed it by accessing my loft. From the attached pics you can clearly figure out. I believe the leakage is due to the joining and it should be at the middle of the wall.
Please advise, how I can resolve it?
Many thanks
Ref
My neighbour has done loft conversation and now I have a leakage in my rear side of the house where I can see the joining of old and new roof tiles is in my area

although from the chimney to the front joining is at the centre

but the back from the chimney is around 6 inches inside in my area from the main wall. I have confirmed it by accessing my loft. From the attached pics you can clearly figure out. I believe the leakage is due to the joining and it should be at the middle of the wall.
Please advise, how I can resolve it?
Many thanks
Ref
