Waterproofing near you in Hong Kong
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Typical price: HK$3,000–HK$160,000
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What waterproofing costs in Hong Kong
| Job size | Low | Typical | High |
|---|---|---|---|
| Wet-area / sealant (small) Bathroom re-waterproofing or small sealant job | HK$3,000 | HK$7,000 | HK$15,000 |
| Roof / membrane system Roof or larger membrane waterproofing | HK$12,000 | HK$28,000 | HK$55,000 |
| Full structural waterproofing External-wall or full structural system | HK$40,000 | HK$80,000 | HK$160,000 |
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How to hire a waterproofing pro in Hong Kong
- Diagnose the seepage source (roof, wall, inter-unit) before choosing a system
- Where inter-unit seepage is the cause, expect the Joint Office / building management involvement
- Ask for a written scope, product spec and guarantee
- Confirm access and scaffolding needs for external work
- Check the contractor's insurance and references
Frequently asked questions
How long does waterproofing last?
A properly installed cavity-drain or tanking system can last decades, and quality membranes carry long guarantees. Cheap surface coatings applied over an unaddressed water problem fail fast. Longevity depends on correct diagnosis and installation far more than the product.
What's the difference between damp proofing and waterproofing?
Damp proofing resists moisture and rising damp (like a damp-proof course in a wall); waterproofing resists liquid water under pressure, as in a basement below the water table. Below-ground and wet-area work needs true waterproofing, not just a damp treatment.
Do I need a guarantee or warranty?
Yes — reputable structural waterproofing comes with an insurance-backed guarantee so the cover survives if the contractor ceases trading. Ask whether the guarantee is company-backed or independently insured, because a company-only warranty is worth little if they close.
Why is my damp problem being oversold?
A common trap is a 'free survey' that always diagnoses rising damp and sells a chemical damp-proof course, when the real cause is condensation, a leaking gutter or bridged damp course. Get an independent, qualified diagnosis before paying for injected chemicals.
Can I waterproof a basement myself?
Small sealant jobs on a minor damp patch are DIY-able, but below-ground waterproofing against groundwater pressure is specialist work — get it wrong and you trap water or flood the space. Full basement systems should be designed and installed by a qualified specialist.
What waterproofing does a bathroom or wet area need?
Wet areas need a waterproof membrane behind tiles on floors and walls, correctly detailed at junctions and drains. In many countries this is regulated work with a standard to meet — a failed shower membrane is one of the most common and costly building defects.
How much does waterproofing cost?
It depends on the method and area. Internal sealants and damp-proofing for a small area are the cheapest option; cavity-drain membranes and tanking cost more; a full basement or below-ground waterproofing system is the most expensive, running into five figures. The cause of the water dictates the right system.
What does waterproofing cost in Hong Kong?
A bathroom or small sealant job typically runs HKD 3,000-15,000, roof or membrane systems HKD 12,000-55,000, and full structural waterproofing HKD 40,000-160,000.
Related services
Planning a budget?
See the full waterproofing cost guide or browse all Hong Kong price guides.
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