Prepared by Home Triage Australia. Updated 6 November 2026. General guidance, not a diagnosis. Not independently reviewed by a qualified tradesperson. How these guides are prepared.
What to do now
Do not drill, strip finishes or cover damp masonry before assessment. Keep clear of damaged electrical fittings. Seek prompt professional help for soft flooring, rapidly worsening damage or unstable masonry.
What could explain it?
- Moisture rising through porous masonry
- Bridged or ineffective damp-proof course
- Plumbing leak or rain penetration
- Condensation or another moisture source
These are possibilities to discuss with the professional, not a confirmed cause.
Useful clues, not a diagnosis
Photograph the affected wall base, nearby ground levels and visible staining without removing finishes. Record whether changes follow rain or plumbing use. A white deposit or moisture-meter reading alone does not prove rising damp.
Investigate before injecting or painting
An assessor should consider drainage, external ground or render bridging, plumbing and other sources. Ask for the evidence supporting the diagnosis and why the proposed treatment is suitable for your wall materials. Older or heritage buildings may need specialist conservation advice.
Link the moisture issues together
Recurring mould, a hidden water leak or gutter overflow may be related, or may be separate problems. Fixing appearance alone does not settle the cause. Ask whether salt-contaminated finishes, drying, ventilation and later decoration are included in the plan.
What the professional may do next
- Map the affected area and timing
- Assess moisture source and salts
- Agree a cause-specific remedial plan
- Allow appropriate drying before reinstatement
Australian cost guidance
Prices checked 25 October 2026. All figures are AUD. These are attributed published examples, not Home Triage quotes or independently verified market averages. Region, access, scope and GST treatment matter. No supplier is endorsed.
Published treatment examples
hipages lists chemical treatment at $75–$300 per linear metre and damp-proof-course installation at $150–$1,000 per linear metre. These are broad method-specific figures, not a diagnosis or whole-house price; the source’s publication date is unclear.
Price source: hipages: damp-proofing cost guide ↗
Price only the diagnosed scope
Ask for wall length and thickness, access, salt treatment, plaster removal, reinstatement, heritage requirements and GST. Get an assessment before choosing a treatment on its metre rate; no single method suits every damp wall.
Before booking
- Ask who will investigate the moisture source and what building, plumbing or other credentials apply to each proposed repair.
- Ask what inspection, parts, labour, GST and follow-up visits are included.
- Get exclusions and approval of extra work in writing.
Find the relevant official licence or authority →
Tenants should report the problem promptly. Responsibility depends on the cause, agreement, common property and local rules; do not assume the person who notices it must pay.
Sources and review status
Safety, licensing and technical starting points are linked below. Price sources are labelled separately. Sources were checked on 25 October 2026; this is not an expert review or an assessment of your home.
Use the checker to organise what you have observed and prepare questions for a professional.
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