Two quotations for a damp survey can differ by several hundred pounds, even where the attendance itself appears comparable. The difference lies in what is being purchased. The term covers everything from a brief moisture check in a single room to a full assessment of how a building is managing water, and the fee follows the depth of the work rather than the label attached to it.
Anyone comparing quotations needs to understand what sits behind the figure. The sections below set out our damp survey cost, the reasons the fee varies from one property to another, and what a professional fee ought to include.
How Much Does a Damp Survey Cost?
Our independent damp surveys start from £300 plus VAT.
We do not operate a fixed scale of charges by property size. Every instruction is quoted individually, once we understand the building and the concern that has prompted the enquiry. The reason is straightforward: floor area is a poor guide to the investigation required. A modest terraced house with moisture appearing on three separate elevations can absorb more time than a substantially larger property with one clearly localised patch. A banded price list would overcharge the simple instruction and undercharge the difficult one.
Two points are worth establishing before any quotations are compared. Confirm whether VAT is included, since a fee quoted exclusive of tax lands approximately a fifth higher than it first appears. Confirm also whether the price is fixed, so that the figure agreed at instruction is the figure ultimately payable.
What the Fee Should Include
A professional inspection amounts to considerably more than time spent at the property. Before two prices are compared, establish that both cover:
- External assessment of walls, pointing, render, rainwater goods and ground levels
- Internal inspection of the affected rooms, with moisture readings recorded
- Assessment of ventilation and condensation risk
- Damp-proof course observations, where one is present
- The condition of accessible timbers, skirtings and sub-floor voids
- A written damp report with photographic evidence
A quotation that omits the written report is not a survey. It is a visit, and it leaves the client with nothing to act upon once the surveyor has departed.
What Affects the Cost of a Damp Survey
The fee tracks the scope of the investigation rather than any single measurement of the property. Several factors bear upon it:
- Size and layout. The number of elevations, storeys and rooms requiring inspection, which affects time on site without settling the fee by itself
- Age and construction. Properties built before 1919 commonly have solid walls, lime mortar and suspended timber floors, all of which behave differently from modern construction and take longer to read correctly
- Number of symptoms. One damp patch in one room is a contained exercise. Moisture appearing in several rooms frequently indicates that more than one mechanism is at work, and each has to be separated from the others
- Access. Restricted sub-floor voids, boarded lofts, fitted furniture and heavy vegetation against an external wall all add inspection time
- Equipment. Recorded meter readings are quick to obtain. Thermal imaging, which traces cold and damp surfaces without opening up the fabric, takes longer and is reflected in the fee
- Location. Travel time is chargeable, so properties further from the surveyor’s base generally attract a higher fee
Types of Damp Inspection and How They Are Priced
Not every damp inspection is the same instruction, and price alone will not indicate which is appropriate. The better question is how much is already known about the cause, since that determines how much investigation is required.
Assessments offered by damp-proofing contractors
A damp-proofing company will frequently inspect a property without charge. The absence of a fee does not make the exercise free. The cost of attending is recovered through the treatment that follows, which means the assessment and the sale of the remedy rest with the same party. That arrangement does not render every such assessment wrong, but the incentive runs towards specifying work rather than towards ruling it out.
An independent damp surveyor holds no interest in the remedial work. We do not sell treatment, we receive no commission on it, and we are not appointed by any contractor who does. Where the correct conclusion is that no treatment is required, that is what the report states, and there is no revenue forgone in stating it. The fee represents the entirety of our commercial interest in the visit.
Damp specialists registered with the Property Care Association
Property Care Association members specialise in diagnosing damp and specifying the treatment for it. That instruction is narrower than an assessment of how a building as a whole is managing moisture, and the fee tends to reflect the narrower scope. Where the cause is already established, and the remaining question is what to do about it, the narrower instruction may be entirely appropriate. Where the cause is unclear, or where more than one mechanism may be contributing, the broader investigation is the one that answers the question.
An independent damp survey
An independent damp survey assesses the moisture within the context of the building as a whole: the construction, the condition, the alterations made over time and the way the property is used. Our fees for this work start from £300 plus VAT.
Damp and timber survey
Damp and timber problems tend to travel together, since sustained moisture is what permits rot and wood-boring insect activity to take hold. Where both are addressed during a single inspection, the combined fee is lower than commissioning the two investigations separately. This is the usual choice where a period property shows moisture at low level with accessible timbers nearby, such as joist ends, skirtings or a cellar.
Damp inspection alongside a home survey
Where a Homebuyers Survey or Building Survey is already being instructed, extending that same inspection to cover damp is the most economical route: one visit, one set of travel costs. The damp inspection is quoted as an addition to the home survey fee rather than as a standalone instruction, and is arranged as an additional service under separate terms of engagement.
Is the Fee Worth Paying?
Set against the cost of the work it may prevent, the fee is modest. Chemical damp-proof course injection is commonly quoted at £70 to £120 per linear metre, and that figure ordinarily excludes the removal and replacement of salt-contaminated plaster, which is where the greater part of the expenditure usually sits. Treating a ground floor and making good afterwards routinely runs into several thousand pounds.
A survey that correctly identifies condensation, and establishes that no damp-proof course work is required at all, therefore saves a substantial multiple of its own fee. Buyers and landlords alike tend to find that the report proves its value as much by excluding causes as by confirming them.
Final Thought
Our damp survey cost starts from £300 plus VAT, with the final figure set by the number of symptoms present, the age and construction of the property, and how far the investigation must go to reach a defensible conclusion. Each enquiry is priced on its own terms rather than against a fixed scale.
The figure worth comparing is not the fee but what it purchases: a recorded diagnosis that can be acted upon, rather than an opinion that cannot. Our damp surveys are carried out by independent, qualified surveyors who are members of RICS, RPSA, CIOB and FODCS (Federation of Damp Certified Surveyors). Contact us with the details of the property and we will provide a fixed quotation before any commitment is made.
Damp Survey FAQs
Why is the fee not fixed by property size?
Because the size of a property indicates how long an inspection will take, not how much investigation the damp will require. A compact flat with moisture in three rooms and no obvious source can absorb more time than a larger house with a single damp patch beside a downpipe. Pricing by band would overcharge the straightforward instruction and undercharge the difficult one. Our surveys start from £300 plus VAT, and each is quoted once the property and the concern are understood.
Is the quoted fee fixed, or can it change after the visit?
Ask at the outset, as practice varies between firms. A fixed-price quotation is agreed before the inspection and does not move afterwards, whereas an hourly arrangement leaves the figure open until the work is complete. For damp, where time on site depends upon what is found, that distinction matters. We quote on a fixed basis.
Is a damp survey already included in a Level 2 or Level 3 home survey?
No. A home survey records damp and rates its severity, but it is not a diagnostic investigation and seldom establishes the cause, which is precisely why such reports recommend a specialist survey as a further step. Where damp is suspected beforehand, pairing the two within one instruction usually costs less than commissioning them separately.
Why do two surveyors record different moisture readings on the same wall?
The common electrical resistance meter measures electrical conductivity rather than water itself. Hygroscopic salts within older plaster conduct readily and can register high on a wall that is dry, which is why a meter reading alone cannot establish the cause of damp. A reliable conclusion comes from reading the ground levels, the ventilation, the construction and, where appropriate, thermal imaging together. That interpretive work accounts for much of the difference between one fee and another.
Should I accept a free survey from a damp-proofing company?
It may be worth hearing, but it should not be treated as a diagnosis. The inspection is funded by the treatment that follows, so the party assessing the problem is also the party selling the remedy. Where expenditure of any significance is contemplated, an independent assessment obtained first is the sounder basis for a decision, and it can be set against any quotation subsequently received.
