Mould removal cost UK: what landlords should pay

For a typical condensation-mould job, expect £150 to £200 for a single affected wall, £150 to £300 for a full room, and £750 to £1,100 for treatment through a whole property. Severe infestations with structural work — replacing contaminated plaster, timber or insulation — can run £1,500 to £3,300 or more. London and the South East price 10 to 15% above the UK average, and emergency response adds 10 to 30%.

What moves the price: the type of mould (black mould jobs price higher), how far it has spread, access, and how deep it has penetrated. Containment and air filtration on bigger jobs adds £50 to £200, and specialist waste disposal £50 to £150.

Read any removal quote carefully for what it excludes. Almost all of them price the clean-up only — diagnosing and fixing the moisture source is a separate job, and it's the one that actually matters.

The government's damp and mould guidance for rented housing says it in one line: simply removing surface mould will not prevent the damp and mould from reappearing. Landlords are expected to identify and tackle the underlying cause — building defects, inadequate ventilation, or condensation.

The same guidance closes the most common escape hatch: it is, in its words, totally unreasonable to blame damp and mould on the tenant's 'lifestyle choices'. Drying clothes indoors in a property with no working extractor fan isn't a lifestyle problem, it's a ventilation problem.

There are four causes to rule through: condensation (the most common in rentals), penetrating damp from a leak or external defect, rising damp, and what the guidance calls traumatic damp — burst pipes and flooding. Each has a different fix, which is why diagnosis comes first. If a roof leak is the suspect, start with our roof leak repair cost guide.

Ventilation first, because it's usually the answer for condensation mould. Swapping a dead bathroom extractor fan for a working one costs £90 to £150 fitted; a humidistat model £150 to £250; a new install with ducting £250 to £350. A positive input ventilation (PIV) unit — which gently pressurises the whole property with filtered air — typically costs £400 to £1,200 installed, with around £900 the common fixed-price quote, and costs pence per day to run.

Anti-mould paint is £20 to £50 a room in materials, or £250 to £400 for a small room professionally repainted — a finishing step after the cause is fixed, never the fix itself. Dehumidifiers (£50 to £300 to buy) manage the symptom and shift the cost onto the tenant's electricity meter; government guidance doesn't recognise them as a landlord remedy, so treat them as a stopgap while the real work is booked.

Where the cause is a leak or rising damp, the spend is the repair itself — pricing for those sits in our damp survey cost guide and the survey that should precede it.

Serious damp makes a property unfit. Under the Homes (Fitness for Human Habitation) Act 2018, tenants can take a landlord to court directly over a serious damp problem — no council inspection needed first — and courts can order the works and award damages. Damp and mould growth is also one of the 29 hazards councils assess under the Housing Health and Safety Rating System, with enforcement powers behind it.

Awaab's Law adds fixed clocks. Since October 2025 it has applied in the social rented sector: emergency hazards investigated within 24 hours, significant damp and mould hazards investigated within 10 working days, a written summary to the tenant within 3 working days of the investigation, and the property made safe within 5 working days. It does not yet apply to private landlords — the Renters' Rights Act 2025 contains the power to extend it, with the detail going to consultation — but those timescales are the clearest signal yet of what 'prompt' will mean in the private sector. Our Awaab's Law guide covers it in full.

The practical position for a private landlord in 2026: respond to every damp report in writing within days, get the cause diagnosed, and document what you did. That's already what the fitness Act expects, and it's exactly the habit the extended Awaab's Law will eventually require.

If the cause is obvious — a failed extractor fan, a visible roof leak — fix it and treat the mould. If it isn't, pay £150 to £300 for an independent damp survey before paying anyone for treatment. A damp-proofing company offering a free survey earns nothing unless it sells you treatment, so the free survey tends to find the thing they install. The independent surveyor's fee is the price of a diagnosis with no product attached.

FixQuotes sources mould removal and remediation quotes from independent local trades — and damp surveys from surveyors with no treatment to sell. Send the job once and we return three quotes for the same job, free for landlords and letting agents. Start at our damp and mould survey quotes page.