What a useful survey should tell you.
A damp survey should explain the likely source, the evidence supporting it, other possible causes, repair priorities and which areas need attention.
The scope varies between a free homeowner survey and a paid written report for a buyer, landlord or legal file. Ask which kind you are booking and what document you will receive.
History and timing
When did it begin? Does it follow rainfall, winter, occupancy or building work? What has already been tried?
Internal pattern
Survey the affected surface and surrounding areas, finishes, salts, timber and the height and shape of readings.
Humidity and airflow
Consider indoor humidity, cold surfaces, extraction, background ventilation and the routes air takes through the home.
External inspection
Review rainwater goods, roof junctions where visible, pointing, render, openings, ground levels, drainage and obvious defects.
Other possible causes
Compare the signs of leaks, condensation, penetration, bridging and low-level moisture using several consistent clues.
Practical report
Explain priorities, limitations, recommended trades or treatment, making-good and any monitoring needed.
Before you accept a specification.
- What evidence supports this diagnosis?
- Which alternative causes were checked?
- Does the outside defect need repairing first?
- What happens to contaminated or damaged finishes?
- What maintenance, access or guarantees apply?
- What would make the diagnosis change?