DPC bridged by external ground or paving levels
What it looks like
Rising damp and tide marks on internal walls next to paths, patios or raised borders; skirtings and plaster deteriorate at floor level.
Why it happens
External ground, screed or paving finished level with or above the damp proof course, so moisture bypasses it into the masonry above.
What it costs if it is missed
Rising damp in the finished dwelling, decorative failure and a warranty claim that usually requires the external surface to be lowered and made good.
How to inspect for it
Measure from finished external level to the top of the DPC at several points around the plot, including where paths meet thresholds. Record the smallest reading.
How to prevent it
Set out external levels from the DPC, not the other way round. Where a level threshold is needed, design a drainage channel and a proprietary threshold detail rather than raising the ground.
Basis in regulation
Last updated 23 August 2026. This is our editorial summary of publicly available regulation and site practice, not building control approval or a warranty determination.