Why nobody can quote this over the phone
Mould remediation is priced from what is actually happening in the building, and the same visible patch can be a one-visit job or a multi-day one depending on what is behind it. Any contractor who quotes a fixed figure from a photograph is either guessing or planning to revise the number once they arrive.
We do not publish prices for this work, and we would treat a phone quote from anyone else with some caution. What we can do is be specific about what moves the number, so you can judge a quotation when you get one.
The seven things that change the price
1. The affected area. A metre of bathroom silicone is a different job from a bedroom wall and ceiling. This is the obvious one, and the least important of the seven.
2. Whether the substrate is porous. Growth on sealed tile wipes off. Growth rooted into plasterboard, wallpaper, MDF cabinet carcass or insulation cannot be cleaned out — that material has to be cut out and replaced. This is the single biggest cost driver.
3. Whether the material is still wet. If the build-up is saturated it has to be dried before anything is closed up, which means equipment on site and a return visit. Closing a wet wall traps the problem.
4. Access. A ceiling void above a fixed ceiling, a wall behind fitted wardrobes, or a chilled water riser in a service shaft all cost more to reach than an open wall.
5. Containment requirements. In an occupied home or a working office the area has to be sheeted and isolated so disturbed spores are not carried through the building. In an empty villa that is simpler.
6. Whether the moisture source is known. If a leak has already been found and fixed, the job is remediation. If it has not, part of the visit is investigation — and sometimes the answer is that the durable fix belongs to a plumber or an MEP contractor rather than to us.
7. Scale and repeat risk. A warehouse with humidity-driven growth across racking and stock is scoped as a programme, not a visit.
What a quotation should tell you
A quotation worth accepting says what is included and what is not. Ours separates them explicitly. Included: inspection and moisture investigation, containment, removal, antifungal treatment, drying of the substrate, HEPA vacuuming, and a photo report identifying the cause.
Not included, and quoted separately if you want them: plumbing and MEP repairs, AC servicing and condensate clearing, replacing saturated plasterboard or ceiling tiles, structural waterproofing, and repainting beyond the treated area.
If a quotation does not distinguish those, you are likely to have a conversation about extras later.
The cheapest quote is often the most expensive outcome
The low quote in this category is usually low because it is surface cleaning: wipe the growth off, spray something on it, leave. It looks identical on the day. The patch returns in four to eight weeks because nothing was done about the water.
You then pay twice, and in the meantime the material behind the surface has been wet for another two months.
What to ask before booking
- What do you think is causing the moisture, and how will you confirm it?
- Will you contain the area before disturbing the growth?
- What happens if the plasterboard behind it is saturated?
- What is included, and what would be extra?
- Will I get photographs of what you found?
Full detail on our process is on the [mould and fungus remediation](/services/cleaning-crew/mould-fungus-remediation) page. If the problem is a musty smell from the air conditioning rather than visible growth on a wall, the relevant scope is [AC mould and coil disinfection](/services/cleaning-crew/ac-mould-coil-disinfection).