Surveys & Condition
Damp findings are three different problems in one word
A survey noting damp could mean condensation, penetration or rising damp, and they cost wildly different amounts to fix.
Most explanations of damp in a survey stop at the point where it starts to matter. This one carries on.
The short version
- Condensation is the most common and the cheapest to address.
- Penetrating damp has an external cause and is fixed outside.
- Genuine rising damp is comparatively rare and frequently over-diagnosed.
Why the word is unhelpful
Surveyors record elevated moisture readings, and a meter reading alone does not distinguish the cause. Condensation, penetration and rising damp look similar on a wall and differ by an order of magnitude in cost. A report that says damp without identifying a mechanism is a prompt for investigation, not a diagnosis.
Condensation is a ventilation problem
Black spot mould in corners, behind furniture and around windows, worse in winter, is almost always condensation. The remedy is ventilation, heating and insulation rather than any injected treatment. It is also the cheapest of the three to resolve and the most likely to be misattributed.
Penetrating damp comes from outside
Blocked gutters, failed pointing, cracked render, defective flashing and raised external ground levels are the usual causes. It typically appears as a localised patch that worsens after rain.
The fix is external repair; internal treatment applied first is money spent on a symptom.
Rising damp is over-diagnosed
Genuine rising damp shows a tide mark up to roughly a metre and requires groundwater moving through masonry. Many diagnoses turn out to be bridged damp-proof courses, raised paths or condensation. An independent damp survey from someone not selling the treatment is worth the fee.
Some of this will suit you and some will not, and that is the point.
Negotiating on a damp finding
Get the cause identified and quoted before discussing price, because the range between causes is enormous. Sellers will resist a reduction based on a worst-case assumption and often accept one based on a quote. Old buildings need breathable repairs; cement render and impermeable paint over lime construction cause the damage they were meant to prevent.
The takeaway
Identify the mechanism before anyone quotes for a cure.
The version you keep doing is the version that works.
Questions readers ask
Should I trust a free damp survey?
Treat it as a sales visit. Firms offering free inspections generally sell the treatment. Pay an independent surveyor for a diagnosis.
Does a damp-proof course guarantee no damp?
No. It addresses one mechanism. Condensation and penetration are unaffected by it, and a bridged course stops working regardless.
