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).

屋宇署及食物環境衞生署聯合辦事處（JPC）負責調查住宅單位之間的滲水糾紛。當業主懷疑滲水來自上層單位，可向JPC提交投訴申請（免費）。JPC會委派人員進行初步視察，並要求相關業主配合測試。如確認滲水來源，JPC可向責任方發出維修通知。惟JPC調查需時，一般可達數月，且調查結果不涉及賠償裁決。若需迅速解決或用於法律程序，業主可自行委聘私人驗滲水公司進行獨立測試，費用自付。

驗滲水費用主要受測試方法、滲水範圍及報告用途影響。單一位置水浸測試費用最低；需熱成像掃描或多房間全面調查則費用較高。如需提供法律或保險用途的書面測試報告，費用亦會相應增加。此外，需要上下層業主同時配合的個案（如廁所滲水糾紛），協調難度較高，部分公司會酌情加收費用。建議向最少三間驗滲水公司索取報價，並確認報告是否符合JPC或保險公司的要求。