INJECTION GROUTING
PU Injection Grouting: HK$2,500-3,500 per Spot, Capped Before We Start
Quick answer
Injection grouting means pumping high-pressure polyurethane (PU) resin into cracks or joints from the wet side to chase and seal water paths, with no demolition — the standard first-line fix for ceiling/wall cracks, window-frame seepage and construction joints. The market price is HK$2,500-3,500 per spot. Note the unit: 'per spot' and 'per job' are two different things, and that ambiguity is exactly what the market's documented fraud pattern exploits (one on-record case escalated from a HK$2,500 quote to HK$26,000 once work started). We write down the spot count and a hard cap before any work begins.
Why injection grouting is the vertical's top fraud vector
Per-spot pricing gives a dishonest operator room to 'discover' more spots once on-site and inflate the bill. One documented case escalated from a HK$2,500 quote to HK$26,000 after work began; a separate injection-related fraud case reportedly cost a customer HK$158,700 (media-reported; case-level details unverified by us). 'Waterproofing blacklist companies' is a common autocomplete search in Hong Kong for a reason.
- We agree a per-spot price and a maximum spot count in writing before work starts — any spot beyond that cap needs your separate sign-off, not a mid-job surprise.
- We photograph and label every spot and provide a written record on completion.
- Watch the unit language: HK$2,500-3,500 is the per-spot price. If a quote uses the same figure for 'the whole job,' ask exactly what it covers before agreeing.
Warranty
The market norm for injection work is around 2 years (per published operator terms). Warranty terms should state in writing what counts as a recurrence at the same spot, not rely on a verbal promise.
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Frequently asked questions
Does injection grouting require breaking tiles or plaster?
No. It's applied from the existing (wet-side) surface without removing tiles or plaster, which is why it's the standard first-line option for localized ceiling or wall seepage.
What exactly does 'per spot' pricing mean?
A 'spot' is one injection point — one crack or one window-frame joint, for example. Before you agree to any quote, ask the contractor to write down the expected spot count and a hard maximum, so there's no room for a mid-job upsell.
What if the same spot leaks again after treatment?
Warranty terms should state in writing what counts as a recurrence at the same spot and what follow-up is included. Confirm both the warranty period and the trigger conditions before you book — don't rely on a verbal promise.