The short answer
There is no single mould-removal price: quotes usually depend on the affected area, severity and whether moisture conditions need separate follow-up. HK$1,400 is Averta's starting price for mould removal, not a fixed allowance for area, room count, leak investigation or repairs; preventive coating starts at HK$700 and removal plus prevention at HK$2,100.
The written quote separates removal, any optional coating, follow-up for moisture or leakage issues, and repairs outside the treatment scope where applicable. The coating warranty is 6–12 months, subject to written coverage terms.
These are Averta's own published bands, not a market-rate survey.
How mould removal is actually quoted
Three things drive the price, whichever company you ask:
- Affected area. A larger patch of mould means more material and more labour — the same logic as any home-service quote.
- Severity (light/moderate/severe). Surface spotting is a different job from mould that has penetrated the wall or caused paint to peel — the second usually needs more than a wipe-down.
- Whether moisture conditions require separate follow-up. Ventilation, condensation or leakage may need assessment or separate work; if moisture conditions remain unresolved, surface cleaning alone may not reduce recurrence.
Averta's published bands (a reference point, not a market rate)
These are our own prices, published as a reference point — not a claim about what other companies or the market charge:
| Tier | From | Includes |
|---|---|---|
| Preventive coating | HK$700 | Surface cleaning + preventive coating application |
| Mould removal | HK$1,400 | Treatment of visible mould within the agreed scope |
| Removal + prevention (full package) | HK$2,100 | Removal + preventive coating |
The written quote separates removal, any optional coating, follow-up for moisture or leakage issues, and repairs outside the treatment scope where applicable. Full detail on what each tier includes and the warranty terms is on our mould removal service page. The coating warranty runs 6-12 months with a free re-treat at the same spot if mould recurs within that period — but if the underlying source hasn't been fixed (an ongoing leak from upstairs, for example), we flag that clearly at the assessment stage rather than folding it into the warranty as if it were covered.
Why quotes vary so much between companies
- Scope of work. Ask for separate items for surface cleaning, mould removal, moisture investigation and repairs. These are different services; compare more than the total price.
- Materials and surfaces. Ask which method or product is proposed, the surfaces it is suitable for and its limitations. Removal and any preventive coating should be listed separately.
- Written warranty. Check the period, locations covered, retreatment arrangements and exclusions. Price or the word “warranty” alone does not establish coverage.
- Whether there's an on-site assessment. A preliminary quote given before an assessment should state its assumptions and what could change the scope or cost. Confirm those details before booking.
What to record before asking for quotes
Record what you can observe so each provider quotes against the same situation. Mark uncertain details as unconfirmed.
- Location and extent: note whether walls, ceilings, tiles or other surfaces are affected, and the approximate area. Photos can support an initial discussion but do not replace an on-site assessment.
- History and access: note any previous treatment, when the problem returned, known leaks, and height, furniture or other restrictions that could affect access and work.
Ask the provider to distinguish confirmed details from points requiring assessment, and to itemise removal, optional coating, moisture investigation and repairs. This helps compare scope; it is not a guide to diagnosing the cause or choosing chemicals.
What a proper quote should itemise
- Did they assess the area (in person or from photos) before quoting, or price it over the phone sight unseen?
- Does the quote include a moisture/leak source check, or surface cleaning only?
- What method or materials — chemical treatment or a coating? How long is the coating warranty?
- If mould recurs, is a re-treat at the same spot free, or does it get billed again?
- If the source turns out not to be resolved (a suspected leak, say), how do they handle that — do they still claim it's covered under warranty?
When mould points to a bigger building problem
Persistent dampness on a ceiling or wall can suggest a leak without confirming its source. Mould removal or coating does not repair a leak, and mould may recur while moisture remains. The cause and repair responsibility need separate confirmation. For the questions tenants and landlords should check, see Who Pays for Mould in a HK Rental?. If you'd rather get ahead of the wet season entirely, see our Hong Kong mould season preparation guide.