How much does mould treatment cost?

What actually affects the price of mould treatment?

The main factors are the size and location of the affected area, how deeply the mould has penetrated into porous surfaces such as plaster, grout or sealant, and whether treating it also requires identifying and addressing a moisture source behind the wall rather than a surface clean alone. A bathroom ceiling with a small patch from poor ventilation is a smaller job than a bedroom wall with mould that keeps returning because of an unresolved damp problem underneath.

Is mould treatment priced differently from a damp survey?

Yes. A Damp, Mould and Water Damage Assessment (what many people call a damp survey) is a separate service, priced on its own terms, that identifies the cause of damp or mould through inspection and moisture readings and produces a written report. Mould treatment is the work of removing existing growth and addressing the moisture behind it. Some jobs need both, a survey first to establish exactly what is causing the mould, then treatment to deal with it, particularly where the cause is not obvious, such as recurring mould with no clear ventilation or leak in sight. How much a damp survey costs is covered on its own page.

Why does a cheap mould spray or a DIY clean often not solve the problem?

A surface spray or bleach can remove the visible colour of mould, sometimes convincingly, without killing the growth at its roots in a porous surface such as grout or plaster, and without touching the moisture that is feeding it. That is why mould treated this way often returns within weeks in the same spot. Professional treatment costs more than a bottle of spray because it is addressing the cause as well as the visible symptom, which is the only way the result actually holds.

Does treating the mould stop it coming back, or do I need extra work too?

Treating the mould itself removes the existing growth. Whether it comes back depends entirely on whether the moisture source behind it is also dealt with. If the cause is simple, such as running an extractor fan more consistently or improving ventilation, that can be enough alongside treatment. If the cause is a leak, penetrating damp or rising damp, the mould will very likely return unless that underlying problem is fixed as well, which is a separate piece of work from the mould treatment itself.

Will a landlord or property manager be charged differently?

The pricing is based on the job, the area and the cause, not on who owns the property. Where a landlord is treating mould as part of meeting a legal obligation, particularly under Awaab’s Law timescales, the same factors apply: a small, isolated patch costs less than treating mould across multiple rooms or a recurring problem tied to a building fault such as a leak or poor insulation.

How do I find out the cost for my specific mould problem?

Because cost depends on the area affected and what is causing it, an accurate price needs to reflect your actual property rather than a generic figure. We confirm the price on a written quote once we understand the problem. Mould remediation sets out what a treatment visit involves, and where the cause is not obvious, a full survey identifies it first.

Related: how to get rid of black mould on walls for good.

If you've got damp, mould, or a leak, you already know it needs sorting.

The longer it sits, the worse it gets. Get in touch and we will agree a date with you. If it is urgent, say so when you call.