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Croydon Damp Answers

For tenants & landlords

What does a damp survey cost — and what does it involve?

An independent damp survey usually costs around £150–£400 for a focused inspection, and more if it's part of a full building survey. It involves a surveyor inspecting the damp, taking moisture readings, identifying the real cause, and giving you a written report with recommended works. Be cautious of 'free surveys' from firms that sell the treatment.

Who's responsible? Shared
  1. Tenant-managed
  2. Shared
  3. Landlord's legal duty

For a rented home, the landlord should arrange and pay for the diagnostic survey, as it establishes the cause of a building defect they're responsible for.

Typical cost
£150–£400 for an independent focused damp survey
Free surveys
Often from firms that profit from the recommended treatment — treat with caution
What you get
Moisture readings, the real cause, and a written report with recommended works
Who pays (rented)
The landlord — it diagnoses a building defect that's their responsibility

What you’ll actually pay

For a focused, independent damp survey — a surveyor coming out specifically to diagnose a damp or mould problem — expect roughly £150 to £400 in the Croydon and wider London area, depending on the property’s size and how much investigation is needed.

If the damp assessment is part of a full building survey (for example when buying), the overall cost is higher because it covers the whole property, but the damp element is included.

A quick reality check on cost: the survey is the cheap part. Its job is to stop you spending thousands on the wrong fix.

The “free survey” trap

You’ll see plenty of “free damp surveys.” Here’s the honest catch: many are offered by damp-proofing companies that make their money from the treatment they recommend. That’s a built-in incentive to find expensive work — classically, to diagnose “rising damp” and sell chemical injection plus replastering.

Free surveys aren’t worthless — they’re fine for getting a quote once you know the cause. But for an unbiased diagnosis, the gold standard is an independent surveyor who has no financial stake in the remedial work. An independent professional is just as happy to tell you “this is condensation, you need ventilation, not injection” — which a treatment salesperson rarely will.

What a good damp survey involves

A proper survey is more than someone waving a moisture meter for five minutes. It should include:

  • Internal inspection of the affected rooms and the pattern of the damp.
  • External inspection — gutters, downpipes, render, pointing, ground levels, the damp-proof course line.
  • Moisture readings (and, where needed, deeper diagnostic methods rather than surface meters alone).
  • Assessment of ventilation and insulation — crucial for condensation diagnosis.
  • A clear written report stating the cause, the evidence, and the recommended works in priority order.

If a report just says “damp present, recommend treatment,” it isn’t telling you what you’re paying for.

Why the diagnosis is the whole point

Because the three damp types — condensation, penetrating and rising — each need a different fix, the survey’s value is getting the cause right. Treat condensation as rising damp and you’ll inject a wall, replaster, and watch the mould return. A £250 survey that prevents a £3,000 mistake pays for itself many times over.

Who pays, in a rented Croydon home

For a tenant, the short answer is: the landlord. Damp is almost always a building defect, which is the landlord’s responsibility to investigate and remedy. You shouldn’t be paying to diagnose a fault with someone else’s property. If your landlord resists, Croydon Council’s environmental health team can effectively force the issue by inspecting and serving a notice.

For a landlord, commissioning an independent survey early is the smart play: it pins down the real cause, gives you a written record that you took the problem seriously, and scopes the work so you only pay for what’s needed.

Frequently asked questions

An independent, focused damp survey typically costs between £150 and £400 depending on the property size and how much investigation is needed. A damp assessment included within a full RICS building survey costs more overall but covers the whole property. Prices vary by area and surveyor; always confirm what's included and whether the surveyor is independent of any firm that would do the remedial work.

Be careful. Many 'free damp surveys' are offered by companies that make their money from the treatment they then recommend — so there's a built-in incentive to diagnose expensive work like chemical injection. They can still be useful for a quote, but for an unbiased diagnosis pay for an independent surveyor with no stake in the remedial work.

A surveyor inspects the affected areas inside and out, uses a moisture meter (and sometimes deeper diagnostic tools), looks for the real cause — condensation, penetrating or rising damp — checks ventilation, insulation and external defects, and produces a written report setting out the cause and recommended remedial works. A good report tells you what's wrong and why, not just 'damp present'.

The landlord should arrange and pay for it. Damp is usually caused by a building defect, which is the landlord's responsibility to investigate and fix. A tenant shouldn't have to pay to diagnose a problem with the landlord's property — and a landlord benefits from an independent report that pinpoints the real cause.

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