Understanding a problem

Defect investigation

A damp patch that keeps coming back. A crack that seems to be growing. A door that has stopped closing properly. Living with a problem you don’t understand is unsettling — and the property trades are full of people who will happily diagnose it as whatever they happen to sell.

Damp, cracking and movement are patterns to interpret—not products to sell against.
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    Associate Member, RICS

  • MCIOB

    Chartered Construction Manager

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    Professional indemnity insurance

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  • A decade in industry

    Contracting, surveying and claims

What the service is really for

A defect investigation is diagnosis, not description — and certainly not a sales pitch. The aim is to establish the cause of the problem, because until the cause is known, any repair is guesswork. Much of what gets sold as “rising damp” turns out to be condensation, a leak or an outside defect that costs far less to fix; most cracking turns out not to be subsidence at all.

Surveyology carries out no repair work and takes no referral fees, so the diagnosis you get is the one the evidence supports — nothing more, nothing less. Reports set out the evidence, the cause, and a clear repair scope you can hand to any contractor for like-for-like quotes.

Fit and deliverables

Find the cause before specifying the cure.

01 / FIT

When to commission a defect investigation

  • Damp patches, staining, mould or musty smells you can’t explain
  • Cracking, sloping floors, sticking doors or other signs of movement
  • A problem that has been “fixed” before and keeps returning
  • A contractor has quoted for work and you want the cause confirmed before spending
  • A purchase survey has flagged an issue and recommended further investigation
02 / OUTPUT

What you get

  • A focused inspection of the defect and the building elements around it
  • Moisture readings, crack mapping, photographs and measurements as the problem requires
  • Thermal imaging where temperature patterns can test the working hypothesis, interpreted alongside moisture readings and construction rather than used as a standalone answer
  • Investigation that distinguishes condensation, penetrating damp, rising damp and leaks — or subsidence, settlement and thermal movement — rather than lumping them together
  • A plain-English written report: what is happening, why, how serious it is, and what to do about it
  • A recommended repair scope you can put to contractors for comparable quotes

From question to answer

How it works

One named surveyor. One clear brief. No handover to a report factory.

  1. 01

    Describe the problem

    The more history you can give — when it started, what has been tried, photos over time — the sharper the investigation. You get a fixed fee before anything is booked.

  2. 02

    Inspection

    A methodical inspection of the defect, tracing the evidence back to its source rather than stopping at the visible symptom — including the outside factors most missed diagnoses ignore: ground levels, gutters, ventilation, drainage.

  3. 03

    Diagnosis and report

    A written report explaining the cause, what needs doing, in what order — and, just as importantly, what does not need doing.

Before you instruct

Ask better questions than “what treatment do I buy?”

Clear scope now prevents disappointment later. If another service—or no paid service—is the better answer, that is what you will hear.

Is the crack in my wall subsidence?

Statistically, probably not — most cracking is settlement, thermal or moisture movement, or plaster shrinkage. But the honest answer needs evidence: crack pattern, width, direction, location and history all matter. That is exactly what the investigation establishes, and if it does point towards subsidence, the report sets out the sensible next steps, including how to approach your insurer.

Why not just get a free damp survey?

Because free surveys are usually sales visits funded by the chemical treatments they recommend. That does not make every recommendation wrong, but it means the diagnosis is not independent. Paying for an independent investigation once is usually far cheaper than paying for the wrong treatment.

Will the report tell a builder what to do?

Yes — it includes a recommended scope of repair in enough detail for contractors to price against. A defined scope is the single best way to get comparable quotes and avoid being upsold on site.

Can you investigate a house I’m buying rather than one I own?

Yes, with the owner’s permission for access. This is common where a purchase survey has flagged something and you want it properly understood — and priced — before exchange.

What if the problem turns out to be minor?

Then the report says so, and you stop worrying. “This is fine, monitor it and spend nothing” is a perfectly common conclusion — and getting it in writing from an independent surveyor is worth having.

End of sectionNext decision / 01

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