How Much Does Water Leak Test Cost in Hong Kong?

There are three main water leak testing methods used in Hong Kong: (1) Water Ponding Test — water is retained on the suspected source area for 24–48 hours to observe seepage below; the lowest cost method but time-consuming. (2) Thermal Imaging — infrared cameras detect temperature differences to locate hidden moisture; fast and non-destructive. (3) Tracer Dye Test — a non-toxic dye is added to the water source to trace leakage paths; suitable for complex pipe systems. Most cases combine water ponding tests with thermal imaging, as the latter significantly reduces investigation time.

Both methods have strengths and limitations, and combining them delivers the highest accuracy. Water ponding tests directly verify the seepage source but are limited to surfaces that can hold water (e.g., floors, rooftops) and require a 24–48 hour waiting period. Thermal imaging is faster and can cover walls and ceilings that cannot hold water, but can be affected by ambient temperature, wall thickness, and material, occasionally producing false readings. Professional leak detection companies typically use thermal imaging to narrow the search area, then confirm with water ponding tests. This combination is the most accurate and is also accepted by the BD/FEHD Joint Office (JPC).

The Joint Office of the Buildings Department and Food and Environmental Hygiene Department (JPC) handles seepage disputes between residential units. Where an owner suspects seepage is coming from an upper-floor unit, a complaint can be submitted to the JPC free of charge. JPC staff will conduct a preliminary inspection and request cooperation from relevant owners for testing. If the source of seepage is confirmed, the JPC may issue a repair notice to the responsible party. However, JPC investigations typically take several months, and findings do not include any determination of compensation. For a faster resolution or for use in legal proceedings, owners may engage a private seepage detection company to conduct an independent test at their own expense.

Seepage detection costs are mainly influenced by the testing method, the extent of the seepage, and the intended use of the report. A water ponding test at a single location is the most affordable option, while thermal imaging scans or comprehensive multi-room inspections cost more. Fees also increase if a written test report is required for legal or insurance purposes. Cases requiring cooperation from both upper and lower-floor owners — such as bathroom seepage disputes — involve greater coordination, and some companies may charge accordingly. It is advisable to obtain quotes from at least three seepage detection companies and confirm whether the report meets the requirements of the JPC or your insurance provider.