THE DEFECT GUIDE / DAMP
Damp survey.
Diagnosis before treatment.
It is a symptom with three different causes, three different fixes, and three very different bills. The word on your survey matters less than the pattern behind it.
Reading other findings? Red flags guide →THE ANSWER / READ THIS FIRST
Find the water's route before you pay anyone to stop it.
Most “damp problems” are the building telling you where water is getting in — or where your own moisture cannot get out. Diagnose the route and the fix is usually proportionate. Skip the diagnosis and you end up buying the industry’s favourite product: a chemical injection for a wall that never needed one.
01 / THE THREE DAMPS, INTERACTIVE
Same word.
Three problems.
Tap each type: the tell-tale pattern, how it reads in a survey, and the right first fix — which is almost never the most expensive one.
02 / THE INDUSTRY PROBLEM
Free surveys,
expensive answers.
A free inspection from a treatment contractor may be tied to the work that business sells. That does not automatically make the findings wrong, but it does make scope and independence important questions. Establish the moisture pattern and likely route first, then compare any remedial recommendation against that diagnosis rather than allowing a treatment quotation to define the problem on its own.
03 / AFTER THE FINDING
The order of operations.
- 01Establish the type — pattern, salts, readings, season (your survey does this)
- 02Trace the route — gutter, pointing, ground level, ventilation habit
- 03Price the source fix first — it is usually the cheap one
- 04Use the number before exchange — reduce, fix, or walk informed
- 05Re-plaster and redecorate last — after the wall has actually dried
04 / WHAT THE SURVEY COST BUYS
Pay for an independent answer.
Not a treatment quotation.
“Damp survey” can describe three different things: moisture observations inside a broader home survey, a separate specialist investigation, or a free inspection from a contractor selling treatment. Those scopes are not interchangeable, so their prices are not either.
Ask who the inspector works for, what areas and tests are included, what cannot be concluded without opening up, and whether the fee buys a written diagnosis rather than a sales quote. A RICS Home Survey can identify visible moisture risk and recommend the next investigation; it should not claim certainty where non-invasive evidence cannot provide it.
05 / OLD HOUSES, SPECIAL RULES
Solid walls need to breathe. Many “damp problems” are suffocation.
Across Yorkshire’s pre-1919 stone and brick stock, cement renders, plastic paints and sealed floors trap the moisture that lime construction was designed to release. On older buildings the remedy is often removal, not addition — which is exactly the kind of cause-first analysis a Level 3 survey exists to give you.
STRAIGHT ANSWERS
Before you ask.
01The survey found damp — should I still buy the house?+
Usually, yes — once you know the cause and the cost. Damp is one of the most common survey findings and most cases have ordinary causes and proportionate fixes. The mistake is not buying a house with damp; it is buying one without knowing which damp, why, and what it costs to resolve.
02What are the three types of damp?+
Condensation (moist air on cold surfaces — the most common by far), penetrating damp (water entering through a defect like failed pointing or a leaking gutter), and rising damp (ground moisture rising through the wall base — the rarest and the most misdiagnosed).
03How do surveyors check for damp?+
Pattern first: where the moisture sits, how it maps to the building outside, salts and tide-marks, mould distribution — supported by moisture-meter readings at vulnerable points. The pattern usually identifies the type; the type dictates the fix.
04Is rising damp real?+
It exists, but it is heavily over-diagnosed. Many 'rising damp' quotes for chemical injection are actually bridged damp-proof courses — a raised patio, a rendered plinth, debris in the cavity — which are fixed by removing the bridge, not injecting the wall.
05How much does damp treatment cost?+
It depends on the cause, access, affected area and repair specification. Ventilation, rainwater defects, external levels and inappropriate finishes require very different work. Diagnose the moisture route before comparing treatment quotes; a price per metre is not a diagnosis.
06How much does a damp survey cost?+
There is no single tariff because a moisture check within a home survey, an independent specialist damp investigation and a contractor's free sales inspection are different services. Compare the written scope, independence, testing limitations, report and follow-up—not only the inspection fee.