The 'Waterproofing Blacklist Company' Guide: Patterns to Watch For

The documented fraud pattern

The core exploit is unit ambiguity — injection work is priced 'per spot,' which gives a dishonest contractor room to 'discover' more spots once on-site and inflate the bill. A documented case escalated from a HK$2,500 quote to HK$26,000 once work began, with the contractor citing 'more spots found' (Oriental Daily, 2 July 2025); separate media reporting describes an injection-related scam that reportedly cost a customer HK$158,700 (case-level details unverified by us, media-reported only). 'Waterproofing blacklist company' is itself a common Google autocomplete search in Hong Kong — a sign of how widespread this trust concern is.

• HK$2,500 → HK$26,000: a documented case of on-site upselling by claiming 'more spots found' (Oriental Daily, 2025-07-02).
• HK$158,700: a media-reported injection-related scam loss (case details unverified independently, media-reported only).
• Hong Kong's Trade Descriptions Ordinance has produced real convictions for related misrepresentation (Sing Tao Daily reporting) — this isn't just talk; there are legal consequences.
• 'Waterproofing blacklist company' is a common Google autocomplete search — a widespread market concern, not an isolated complaint.

What a legitimate quote looks like

Transparent pricing starts with a quote that clearly states its unit — 'per spot' and 'per job' are two completely different things, and that ambiguity is exactly what the market's documented fraud pattern exploits. A responsible quote should include:

• A clearly stated pricing unit (per spot / per sq ft / per job) — no vague language.
• An expected spot count and a hard cap agreed in writing before work starts; anything beyond that cap needs your separate sign-off.
• Warranty period and trigger conditions in writing (e.g. what counts as a recurrence at the same spot), not just a verbal promise.
• A written record or photos of the completed work.

Our pricing page publishes every range we currently have reliable evidence for — and is equally upfront about the items we don't (like window seepage or surveyor reports), rather than making up a figure just to have one.

Red flags

• The contractor 're-quotes' on-site, claiming to have found more cracks or spots.
• The quote never states a unit (per spot vs per job), and stays vague when you ask.
• Insists on full cash payment on the spot with no written record.
• Warranty terms are verbal only, with no written trigger conditions.
• High-pressure, deadline-style sales tactics (e.g. 'this price is only good if you book today').

Any single flag on its own may not mean fraud, but several appearing together — especially combined with pressure not to compare quotes — is a strong reason for caution.

What to do if it happens to you

First, keep every piece of written evidence — the quote, WhatsApp messages, payment records, photos of the work. Per media reporting, Hong Kong's Trade Descriptions Ordinance has produced real convictions for related misrepresentation, meaning this kind of case isn't without recourse. If money is involved, the Small Claims Tribunal is one avenue; for legal advice, the Community Legal Information Centre (CLIC) offers free initial consultations. We are not legal representatives — the above is general information, not legal advice.

Related reading

• Our Price List: We Only Publish What We Have Evidence For
• PU Injection Grouting: HK$2,500-3,500 per Spot, Capped Before We Start
• Leak Detection with a Written Report: You Can't Fix What You Can't Find