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Costs, timelines, pitfalls and the right questions to ask before any damp proofer starts on damp Survey.
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Free survey bias
Contractor offering free survey finds work to recommend. Always pay for independent.
Salt contamination misdiagnosed
Salt residue in plaster can show high moisture reading without damp. Trained surveyor recognises.
One-cause focus
Many homes have multiple damp issues. Survey should address all.
Brief reports
Quality reports include photos, moisture readings per location, recommendations with ballpark costs.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Standard damp survey1–2 hour visit, written report
£120–£300
Full RICS Level 2/3 with dampPre-purchase, includes damp
£400–£900
Specialist damp & timber surveyIncluding woodworm, dry rot
£250–£500
Heritage damp survey (SPAB)Pre-1919 properties
£400–£1.2k
Free contractor "survey"Sales tool — not independent
£1–£1
Mortgage retention damp surveyFor mortgage approval
£180–£400
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Damp Proofer explained
An independent damp survey is the single best investment if you suspect damp problems. Expect to pay £120–£400 for a UK PCA-qualified damp survey — far less than the £000s wasted on misdiagnosed treatment.
What Does the Work Invovle?
PCA-qualified surveyor inspects internally and externally. Tools: moisture meter (Tramex), salts test kit, sometimes hygrometer for monitoring. External inspection: pointing, render, gutters, roof, flashings. Internal: visible damp areas, moisture readings on walls, ventilation review. Reports findings: cause identified (rising, penetrating, condensation, leak), recommendations, ballpark costs.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Standard damp survey | 120 | 300 | 1–2 hour visit, written report |
| Full RICS Level 2/3 with damp | 400 | 900 | Pre-purchase, includes damp |
| Specialist damp & timber survey | 250 | 500 | Including woodworm, dry rot |
| Heritage damp survey (SPAB) | 400 | 1,200 | Pre-1919 properties |
| Free contractor "survey" | 0 | 0 | Sales tool — not independent |
| Mortgage retention damp survey | 180 | 400 | For mortgage approval |
| Independent expert witness report | 500 | 2,000 | For legal disputes |
How Long Does It Take?
Visit: 1–2 hours. Report: 2–5 working days. Specialist surveys with sampling: longer for lab analysis.
DIY or Professional?
Professional only — proper diagnosis requires training and equipment. Cheap DIY moisture meters are unreliable.
Choosing the Right Tradesperson
PCA (Property Care Association) member — verified surveyor accreditation. RICS surveyor for pre-purchase. SPAB-accredited for heritage. Independent surveyor (not contractor doing remedial work) for unbiased diagnosis.
UK Regulations
PCA Code of Practice. RICS standards for surveys. SPAB guidelines for heritage. Awaab's Law requires landlords to obtain independent diagnosis for damp issues.
Common Problems
- Free survey bias: Contractor offering free survey finds work to recommend. Always pay for independent.
- Salt contamination misdiagnosed: Salt residue in plaster can show high moisture reading without damp. Trained surveyor recognises.
- One-cause focus: Many homes have multiple damp issues. Survey should address all.
- Brief reports: Quality reports include photos, moisture readings per location, recommendations with ballpark costs.
Frequently Asked Questions
Free survey vs paid?
Free: contractor sales tool, biased toward finding work. Paid (PCA-qualified): independent, focused on accurate diagnosis. Pay £120–£400 to save £1,000s on wrong treatment.
What does a damp survey include?
External inspection (pointing, render, gutters, roof), internal moisture readings, salt analysis if needed, written report with photos, recommendations with ballpark costs.
Should I get a survey before buying?
For any property with visible damp signs: yes. RICS Level 2/3 survey includes damp assessment — add specialist damp/timber survey if RICS flags concerns.
Who pays for survey, buyer or seller?
Buyer typically. Some sellers commission a survey to support asking price. Buyer always wants their own independent survey.
Can the survey be wrong?
Yes — even PCA-qualified surveyors disagree. For high-value treatments, get second opinion. Be wary if surveyor recommends £000s of work without clear diagnosis.
Will the survey identify the underlying cause?
Quality survey: yes — surveyor's job is to identify cause, not just describe damp. Cheap surveys describe but don't diagnose.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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