The survey said damp. What that actually means, and what to do next
Further investigation recommended is the survey working, not the surveyor hedging. Why a RICS survey cannot settle it, who the free damp survey is really working for, and how to turn an unpriced finding into a number you can negotiate with.
By The Damp GuyLast updated
The short version
Your survey has handed you an unpriced question, and it was designed to. A RICS Level 2 surveyor uses a damp meter and does not open up the fabric, so recommending further investigation is the service working. The trap is what most buyers do next, which is to call a damp company for the survey it provides at no charge, unaware that the firm assessing the wall is the firm that would treat it. Your actual job is to find out which of the three kinds it is, because they carry completely different bills.
Why the survey could not tell you
Buyers read further investigation recommended as a warning. It is a description of the service's boundary.
RICS publishes a description of what a Home Survey Level 2 is. Two things in it decide everything about your situation: the surveyor uses a damp meter, and the surveyor does not force or open up the fabric of the building.
Put those together and a Level 2 survey structurally cannot settle a damp diagnosis. RICS does not claim it can. The designed response to that uncertainty is a recommendation for further investigation, which means the sentence worrying you is the surveyor doing the job correctly and saying so.
The meter reading, if you were given one, deserves the same scepticism. A conductance meter reports a wood moisture equivalent on anything that is not wood, and salts and buried metal both read as water. The RICS, Historic England and PCA Joint Position Statement tells surveyors not to rely on potentially misleading data and to look for the source. That document is co-signed by the trade body representing the treatment industry.
The next step everyone recommends, and who pays for it
Every page on this subject says get a specialist damp survey. None of them says whose payroll the specialist is on.
A free damp survey is provided by the firm that would quote for the treatment. So the person deciding whether you need work, and how much of it, is the person who would be paid to carry it out.
That is not a claim about anybody's honesty. It is a structural fact about how the service is arranged, and it would apply to any trade organised the same way. But it means the free survey is a sales visit that produces a document, and you are about to use that document to negotiate tens of thousands of pounds. The incentive runs one direction and it is not yours.
If you want an opinion with no interest in the outcome, you are looking for somebody you pay, who does not sell the remedy. That is the whole argument of the damp survey page on this site, and it matters most at exactly this moment, because this is the one point in the process where the answer changes a price.
One word on a survey, three very different bills
This is why an unpriced damp finding cannot be negotiated against until you have narrowed it.
| Kind | How you tell | What it means for the purchase |
|---|---|---|
| Condensation | Tracks the cold. Worse in winter, on the coldest surfaces. | Usually a management and ventilation question rather than a building repair. The cheapest of the three by a wide margin, and the one most often sold as the expensive one. |
| Penetrating | Tracks the rain. Appears at a place, not a height. | A defect with a location, so it prices like a repair: the gutter, the pointing, the sill, the render. Findable, quotable, negotiable. |
| Rising | Tracks neither. Sits at a height up the wall. | The expensive one where it is genuinely present, and the one most often diagnosed without the test that would confirm it. |
Which is why the sequence matters. Establish which kind you are looking at, get the cause identified by somebody with no stake in the remedy, get a price for fixing that cause, and only then go back to the vendor. Going back with "the survey mentioned damp" invites a haggle about a feeling. Going back with a defect and a quote is a negotiation about a number.
What to do, in order
None of this is a verdict on whether to buy the house. That is your money and your decision. This is the sequence that gets you to it informed.
- Read the survey wording precisely. "Further investigation recommended" is the designed output of a service that does not open anything up. It is not a finding of rising damp, and it is not a valuation of anything.
- Go back and look yourself. Ask when the patch is worse, whether it moves with the weather, and what is on the other side of that wall. A second viewing on a wet day tells you more than a meter does. It is also worth knowing what the seller was actually asked, because the form they completed never asks whether the property has damp. The only damp question on it is whether an unexpired damp-proofing guarantee exists.
- Get the cause identified by someone who does not sell the cure. If the report you rely on comes from the firm quoting for the work, you are negotiating using their document.
- Convert it into a price before you negotiate. An unpriced worry gets split down the middle. A quoted repair gets deducted.
- Find out what your lender is going to do. A valuer's view can change the shape of the purchase entirely, which is what a retention is, and it is better to know before exchange than after.
About this resource
The RICS wording is from RICS's own published description of the Home Survey Level 2, already sourced and checked for the damp survey pillar on this site. The meter material and the Joint Position Statement come from the damp meter readings pillar, sourced from the meter manufacturer's own documentation and from RICS. Nothing here is our characterisation of what a surveyor does; it is what the institution publishes.
There are no costs on this page and no devaluation figure. Repair costs live on this site's cost pages with their own sourcing and their own dates, and a general percentage for what damp knocks off a house does not exist in any defensible form: it turns on the kind, the extent, the finance and the market.
There is also no verdict here on whether to proceed, renegotiate or walk. That is your decision with your money, and anyone offering you a rule for it on a web page has not seen the house. This site does not survey, treat, quote or refer, and it cannot diagnose a wall from a description.
Common questions
Is it wise to buy a house with damp?
It depends entirely on which of the three kinds it is, and the survey almost certainly has not told you. Condensation is a management problem that often costs very little. Penetrating damp is a building defect with a location, so it is priced like a repair. Rising damp, where it is genuinely present, is the expensive one. "Damp" on a survey is not one risk with one price, it is three risks with three very different bills, and your job before negotiating is to turn it into a number.
My survey says "further investigation is recommended". Is that bad?
It is the service working correctly, not the surveyor hedging. RICS's own published description of the Home Survey Level 2 says the surveyor uses a damp meter and does not force or open up the fabric of the building. A survey that cannot open anything up structurally cannot settle a damp question, and RICS does not claim it can. So the recommendation is the designed response to uncertainty. What it hands you is an open question, and open questions are what stall sales.
Is the free damp survey worth having?
Know who is paying for it. A free damp survey is provided by the firm that would quote for the treatment, which means the person establishing whether you need work is the person who would be paid to do it. That is not an accusation about anybody, it is how the service is structured. If you want an opinion with no interest in the answer, you are looking for someone you pay, who does not sell the remedy.
What are the first signs of damp in a house?
Watch when it changes rather than what it looks like, because all three kinds can put the same dark patch on the same wall. Condensation tracks the cold, appearing on the coldest surfaces and worsening in winter. Penetrating damp tracks the rain and appears at a place. Rising damp tracks neither and sits at a height. On a viewing you are also looking for fresh paint on one wall, a wardrobe against an external wall, and every window shut on a warm day.
Can you permanently get rid of damp?
You can deal with a cause for good. What you cannot do is immunise a building against water for ever. That distinction matters more than it sounds when you are buying, because a guarantee against recurrence is being offered on the second thing while only the first is achievable. If the source is found and repaired, the damp does not come back. If the treatment addressed the wall rather than the source, it returns, and that is the pattern this whole site exists to point at.
What does the damp meter reading in my survey actually mean?
Less than it looks. A conductance meter reports a wood moisture equivalent on anything that is not wood, so on masonry the number is a reference scale rather than a measurement of that wall. Salts and buried metal both read as water. The RICS, Historic England and PCA Joint Position Statement tells surveyors not to rely on potentially misleading data and to look for the source, and it is co-signed by the trade body representing the treatment industry.
How long does a damp wall take to dry out?
Nobody can honestly tell you from a survey, and this page is not going to invent a figure. It depends on the thickness and construction of the wall and, decisively, on whether the source is still supplying water. A wall with a live source never dries, however long you wait. That is the question to answer first, and it is a different question from how long drying takes.
What happens if I buy it and do not fix the damp?
For condensation, you manage it and it stays manageable. For penetrating damp, water keeps arriving at a defect that is not getting smaller, and the damage moves from decoration into plaster and eventually into timber. For rising damp, the same. The reason to establish which one you have before exchange is not fear, it is that only one of the three is safe to leave alone, and it is the cheapest one anyway.