Mould in rented properties is one of the most common — and most disputed — maintenance issues in the UK. Both landlords and tenants frequently believe the other party is responsible, and both are sometimes right. The legal picture is more nuanced than most people realise, and the outcome often depends on the specific cause of the mould rather than a blanket rule.
This guide explains the legal framework that applies to mould in rented properties in England and Wales, what landlords are and are not required to do, what rights tenants have when a landlord fails to act, and how disputes typically resolve.
The Legal Framework: Three Key Laws
Homes (Fitness for Human Habitation) Act 2018
This is the most important piece of legislation for mould disputes. It requires that all rented properties in England are fit for human habitation at the start of the tenancy and throughout. The Act specifically lists damp and mould growth as factors that can make a property unfit. If a property has significant mould caused by a structural defect or a condition the landlord is responsible for maintaining, tenants can take the landlord to court under this Act without first obtaining a local authority inspection.
Section 11, Landlord and Tenant Act 1985
Section 11 places a legal obligation on landlords to keep in repair and proper working order the structure and exterior of the property, including walls, roofs and drains; and the installations for heating and hot water supply. Mould caused by a defective roof allowing water penetration, failed cavity wall insulation, or a broken heating system is clearly within the landlord's Section 11 obligations.
Housing Health and Safety Rating System (HHSRS)
The HHSRS is the system used by local authority housing enforcement officers to assess hazards in rented properties. Damp and mould growth is a Category 1 hazard (the most serious) if it poses a significant risk to occupant health. Where a council inspector finds a Category 1 hazard, they have a duty to take action — which can include issuing an Improvement Notice requiring the landlord to remedy the issue within a specified timeframe.
When Is the Landlord Responsible?
Landlord responsibility is most clear-cut when the mould arises from a condition that is the landlord's duty to maintain or repair:
- ✓Structural defects allowing water penetration — failed roof, cracked render, defective guttering, rising damp through the floor slab
- ✓Inadequate or absent ventilation — extraction fans not installed in bathroom or kitchen, or fans that vent into the loft rather than externally
- ✓Failed cavity wall or loft insulation creating cold spots that generate condensation
- ✓Broken or inadequate heating system making it impossible to maintain a reasonable temperature
- ✓Plumbing leaks within the fabric of the building (as opposed to tenant-caused damage)
- ✓Mould that was present before the tenancy began and was not disclosed
When Can Responsibility Fall to the Tenant?
Where mould arises purely from tenant lifestyle — particularly in a structurally sound, adequately ventilated property — the landlord may have a legitimate argument that the mould is not their responsibility. The most common tenant-behaviour causes include:
- Consistently failing to heat the property to a reasonable temperature
- Drying laundry indoors without adequate ventilation
- Never opening windows or using extractor fans
- Blocking air vents or covering radiators
- Failing to report maintenance issues that then cause water ingress
Important: In practice, most mould cases involve a combination of factors — both a structural inadequacy and lifestyle behaviour. A court will typically look at all the evidence and apportion responsibility accordingly. Landlords who try to blame tenants entirely for mould in properties with poor insulation or inadequate ventilation frequently lose these disputes.
What Tenants Should Do: Step by Step
- 1Document the mould thoroughlyPhotograph every affected area with a date-stamped camera. Note where it is, how large it is, and whether it is getting worse. This evidence is critical if the matter escalates.
- 2Report in writing to your landlordSend a written notice (email is fine) describing the mould, its location, and requesting that it be assessed and treated. Keep a copy. A verbal report is not enough — you need a paper trail.
- 3Allow a reasonable response timeLandlords are generally expected to respond to repair requests within a reasonable time — typically 14–28 days for non-emergency issues, sooner if health is at immediate risk.
- 4Contact your local council if they fail to actIf your landlord ignores or dismisses the report, contact your local council's private housing enforcement team. They can carry out an HHSRS inspection and issue formal notices.
- 5Consider a Rent Repayment OrderIf the council has issued an improvement notice and the landlord has not complied, tenants in England can apply to the First-tier Tribunal for a rent repayment order of up to 12 months' rent.
Advice for Landlords
If you own rental property in Yorkshire and receive a mould complaint, the correct response is:
- ✓Respond promptly in writing, acknowledging the report
- ✓Arrange a professional inspection — ideally by a qualified mould specialist — to identify the root cause
- ✓If structural or ventilation defects are found, arrange repair before or alongside mould treatment
- ✓Commission a professional treatment and obtain a written treatment report
- ✓Keep records of all communication and works undertaken
We work with landlords and letting agents across Yorkshire to provide professional mould inspections, treatment and written compliance reports. See our landlord enquiry page or call 07746 632 949.
Frequently Asked Questions
Is a landlord responsible for mould?
Yes, in most cases. Under the Homes (Fitness for Human Habitation) Act 2018, landlords must ensure rented properties are free from hazards including damp and mould. If mould arises from a structural defect or inadequate ventilation that is the landlord's responsibility to maintain, the landlord must remedy it.
Can a tenant withhold rent because of mould?
Tenants should not unilaterally withhold rent as this risks eviction. Instead, report the issue in writing to your landlord and allow a reasonable time to respond. If they fail to act, contact the local council housing team or seek legal advice before taking further action.
What can tenants do if a landlord ignores mould?
Report the issue to your local council's housing enforcement team. They can inspect the property and issue an improvement notice or prohibition order under the Housing Health and Safety Rating System (HHSRS). You can also apply to court for a rent repayment order if conditions breach the Homes Act.
Does a landlord have to provide a mould certificate?
There is currently no legal requirement for a specific mould certificate, however landlords have a duty to ensure properties meet the Decent Homes Standard and are free from category 1 HHSRS hazards including damp. Some landlords obtain professional treatment reports as evidence of compliance.