Notice the pattern
Wet windows and cold corners in colder weather can suggest condensation. A stain that follows rain may point towards an external route.
Neither pattern is definitive. Mixed causes are possible, and plumbing leaks should also be considered.
Choose the relevant response
Humidity and cold surfaces call for a different plan from rain entry or rising ground moisture. DPC injection does not address all three.
Tell us when it appears, which surface is affected and what changes it.
Compare the source and the pattern
Rising damp involves ground moisture moving through masonry. Low deterioration, salts or tide marks can prompt that investigation, but similar damage may have other sources. Condensation relates to moisture in the air meeting a cold surface; wet windows and mould in cold corners can be clues.
The patterns can overlap, and more than one cause may affect a property. A high electrical reading, mould or a photograph does not settle the distinction.
Why the treatment differs
A suitable remedial DPC restricts rising moisture through a wall. It does not control room humidity or repair rain entry. Ventilation and moisture control address different conditions and do not replace a necessary masonry or plumbing repair.
Ask how the assessment supports the proposed treatment and what other relevant causes have been checked.
