Mould in Rented House Ireland: Tenant or Landlord Responsibility?

Mould in rented house Ireland questions nearly always come down to two sets of duties. The landlord must provide a home free of damp with ventilation that works. The tenant must report problems, use that ventilation and keep surfaces clean. Most arguments are about which of those failed first.

Who is responsible for mould in a rented house in Ireland?

The landlord is responsible for the causes of damp and for ventilation; the tenant is responsible for reporting problems and for everyday condensation habits. Both duties are written into law, not just tenancy agreements.

The landlord’s side comes from the Housing (Standards for Rented Houses) Regulations 2019, known as S.I. No. 137 of 2019. They require the home to be in “a proper state of structural repair” and “not defective due to dampness or otherwise”. The RTB summarises this as: the building “must not have damp”.

The tenant’s side comes from section 16 of the Residential Tenancies Act 2004. Tenants must notify the landlord of “any defect that arises in the dwelling that requires to be repaired”. They must also not cause deterioration beyond normal wear and tear. Surface growth can be removed by a professional mould cleaning service, but the cause still needs fixing.

What do the 2019 rental standards say about damp and ventilation?

The 2019 Regulations require adequate ventilation in every habitable room and specific ventilation to remove water vapour from kitchens and bathrooms. Regulation 8 also says all means of ventilation “shall be maintained in good repair and working order”.

That covers extractor fans, window vents and openable windows. A bathroom fan that has not worked for months is a landlord repair, not a tenant habit. The RTB adds that tenants must be able to control the heating and ventilation, and each bathroom should have a fixed heater.

The Regulations came into operation on 1 May 2019 and apply to most rented houses, including flats and maisonettes, with some exceptions. They replaced the 2017 Regulations.

Which mould problems are the tenant’s and which are the landlord’s?

The cause decides who deals with it. This table sets out common situations and the rule that usually applies.

Grey areas are common. A cold bedroom with no working vent can still show mould when the tenant airs it daily. Keep a record of what you did, with dates, before you argue the point.

What should a tenant do about mould in a rented house?

Report it in writing, photograph it, and keep cleaning the surface while you wait. Under section 16 you must tell the landlord about defects, and you must allow reasonable access for repairs.

The HSE gives simple prevention steps for damp homes. Use an extractor or open a window when cooking or showering, keep bathroom curtains clean, and dry washing outside if you can. Those habits matter even when the root cause is the landlord’s.

For patches on sealant, window frames, walls and ceilings, a professional clean removes the surface growth. We charge from €95 for one room and €120 for a whole bathroom. Cleaning removes what you can see; it does not fix a leak or a broken fan.

If you clean it yourself, read the label and never mix products. The Health and Safety Authority’s home chemicals guidance is plain: “Don’t mix chemicals.” Our step-by-step post on cleaning mould from walls covers safe methods.

What can you do if the landlord will not fix the damp?

If the landlord does not act within a reasonable time, you can apply to the RTB and ask your local authority to inspect. The RTB sets out three steps: tell the landlord in writing, refer the matter to the RTB if nothing happens, and contact the local authority.

Local authorities enforce the standards. After an inspection, they can issue an Improvement Notice telling the landlord what to fix. If that is ignored, a Prohibition Notice can stop the landlord from re-letting until the work is done.

Do not stop paying rent. The RTB says tenants must pay rent in full and on time even if there is a dispute. For an RTB case about the standard of the property, its evidence guide suggests the letting agreement, correspondence, photos and repair invoices.

Can mould in a rented house affect your deposit?

Yes, if the landlord can show the tenant caused it. A landlord can deduct for damage beyond normal wear and tear, but the RTB says the landlord “must give you evidence to justify the deduction”.

Mould from blocked vents or years without airing is the classic tenant case. Mould from a leaking roof or a fan that was reported broken is not. Your written reports are what separate the two.

Clean any surface mould before the final inspection and photograph the result. Our guide on whether a landlord can keep your deposit explains the deduction rules.

Condensation peaks in the colder months, when windows stay shut and washing dries indoors. Our post on winter condensation in Dublin homes covers the habits that help most.