Damp Proofing

Water in my sub floor from party wall

Sumaya 31/03/2026 - 2.00 PM

Hi im in a semi detached house probably built in 1940s in east Birmingham. We've been noticing water in our subfloor pooling in from a gap in the mortar of brick wall shared with our neighbour. To the point where we can hear the water coming in. A builder has told me its normal flood water that's draining from neighbours side and down into our subfloor which is normal. Our property sits lower than theirs so gravity makes this water trickle in... I just wanted to check with other people for their opinion as i think this is one of reasons we have damp there as well as a lack of ventilation in our sub floor. Sometimes its happening after it rains sometimes it'll be days after it rains or just randomly.