Defects
Mold in rental property: rights and rent reduction
Updated on September 5, 2026
At first, it is a dark spot in the corner. A few weeks later, the bedroom smells musty and the wardrobe is detached from the wall. Anyone reporting mold in a rental home often receives the same answer: ventilate more, heat better. Sometimes that is correct. But mold can also be caused by a leak, a thermal bridge, rising damp, or a malfunctioning ventilation system.
When it comes to your rights, the cause makes the difference. If the mold is caused by a structural or technical problem, the landlord must, in principle, rectify the cause. If repairs are not made, a temporary rent reduction, a claim for repairs, or compensation for demonstrable damage may be possible. If the mold is primarily the result of insufficient ventilation or heating, while the property has adequate provisions for this, the responsibility may lie with the tenant.
- Photograph the mold, damp spots, and possible cause. Note the date and the room.
- Report the problem to the landlord in writing and request an investigation and rectification of the cause.
- Continue ventilating and heating as normal. Document that you are doing so to minimize disputes later on.
- Save emails, work orders, measurement data, and photos of recurring mold.
- Do not lower the rent yourself. First have the appropriate procedure for your rental agreement assessed.
Mold in a rental home: who is responsible?
The landlord is responsible if the mold arises from a defect in the property for which he is required to carry out maintenance. Consider a leaking roof, penetrating or rising damp, a thermal bridge, broken mechanical ventilation, or insufficient repairs following a previous leak. The tenant is responsible for normal use, including adequate ventilation, heating, and keeping accessible ventilation grilles clean.
In real cases, that dividing line is rarely so neat. A cold exterior surface can cause condensation, while the tenant also uses little heating. A bathroom may have a drain that is too small and remain blocked for too long after showering. That is why a mold case is not about who shouts the loudest, but about the technical cause and the evidence.
| Sign | Possible cause | Who needs to act? |
|---|---|---|
| Damp spot grows after rain or is located near the roof, facade, or window frame | Leakage or penetrating damp | Usually the landlord: inspection and structural repair |
| Mold low down on a ground-floor wall, with loose plaster or salt efflorescence. | Rising damp | Usually the landlord: have the cause investigated |
| Mold around a cold corner, exterior wall, or concrete edge | Thermal bridge or condensation | Investigation required; structural cause and use may coincide |
| Mechanical extraction is not working or the duct is technically defective | Insufficient ventilation due to technical defect | Usually the landlord |
| Vents are clogged or dirty and windows remain closed for extended periods. | Insufficient ventilation during use | Usually the tenant, unless the facilities themselves are inadequate. |
Anyone looking for a broader overview of leaks, drafts, wood rot, and other problems will find it on our information page about defects in a rental propertyThis page specifically addresses the approach and evidence regarding moisture and mold.
What does the 2026 Defects Book say about mold?
The Rent Commission uses the Defects Book to assess whether a maintenance problem is serious enough for a temporary rent reduction. The July 2026 version distinguishes between very serious damp and mold problems, localized mold caused by rising or penetrating damp, condensation due to a technical deficiency, and insufficient ventilation options. This version applies to cases where the notification of defects was made on or after July 1, 2026.
For localized mold, damp, or soot spots in a living space, the Rent Commission generally uses a surface area of 0,25 square meters as the threshold for a serious defect. That is approximately an area of 50 by 50 centimeters. This is not an automatic guarantee of a rent reduction: the cause, the size, and the technical condition also count.
If mold, present almost constantly, spreads through multiple living or sleeping areas and those spaces are nearly unusable, a more serious category may come into play. Different sections of the Defects Book apply to a bathroom than to a living room or bedroom. Therefore, a black spot in a sealant edge is legally different from a soaked bedroom wall following a facade leak.
Read the current Book of Defects of the Rent Commission In case of doubt regarding the category, a file must still be assessed based on the actual property; a table on the internet does not replace an inspection.
Mold in the bathroom of a rental home
Mold in the bathroom of a rental home is not automatically the tenant's fault. The landlord must investigate and repair any technical defect in the ventilation, facade, or structure. The tenant must, however, make normal use of the available ventilation options and allow moisture to escape after showering.
Does the ceiling remain wet for an extended period, does the extraction system barely draw out any air, or does the mold return shortly after cleaning? If so, document this. Make a video of the extraction system, photograph the area before cleaning, and request an investigation into the capacity and air supply in writing. In the Defects Book, a bathroom is assessed separately from a living room or bedroom.
Black mold in a rental home: does the color mean anything?
Black mold looks alarming, but the color does not indicate who is liable or what type of mold is present. Legally, the extent, location, cause, and consequences are more important. Therefore, do not simply note that there is 'black mold.' Describe where the spot is located, when it recurs, whether the wall feels damp, and what happened just before the growth.
Mold behind a cupboard against an exterior wall can be associated with poor air circulation, but also with a cold or damp facade. Mold that spreads after every rain shower points more towards water ingress. Mold in a bathroom, on the other hand, requires an investigation into extraction, air supply, and shower usage.
This is how you report mold to the landlord
A phone call is quick, but difficult to prove later. Therefore, send an email or letter. Do not just ask to wipe away or paint over the mold. Ask for an investigation into the source of the moisture and for lasting repair. Otherwise, the wall may appear clean while the problem persists behind the paint.
- Describe the place exactly. Name the room, wall, corner, or ceiling and mention since when the mold has been visible.
- Document the development. Add overview photos and detail photos, preferably from the same angle and with a date.
- Name possible causes without making a diagnosis yourself. For example, write that the spot gets bigger after rain or that the extraction does not seem to be working.
- Request an inspection and a remediation plan. Request for investigation of the cause, a date for inspection, and written feedback.
- Save everything. Save your report, acknowledgment of receipt, work orders, and responses. Take screenshots of a tenant portal.
On the page about a written notification of defects to the landlord A sample letter is also included. Always adapt it to your property, dates, and previous reports.
How do you prove that you ventilate and heat sufficiently?
In cases involving mold, landlords often argue that the tenant is not ventilating or heating sufficiently. Simply stating that you open a window every day is not always enough. Make it verifiable. For a few weeks, briefly keep track of when you ventilate and what temperature and humidity you measure.
- Photograph open ventilation grilles and note when you clean them.
- Make a short video showing whether mechanical extraction is working audibly or tangibly.
- Store measurement data for temperature and relative humidity, with date and room.
- Note when condensation forms on windows and whether it disappears after ventilating.
- Place furniture a few centimeters away from a cold exterior wall and record whether the mold returns.
A cheap hygrometer can make a pattern visible, but it is not a structural report. Measurements become stronger when they match photos, weather conditions, signs of leaks, and the findings of a mechanic or inspector.
How long does the landlord have to resolve the mold?
There is no fixed statutory repair period that is the same for every mold problem. The landlord must act within a reasonable timeframe. What is reasonable depends on the severity, health risks, the cause, and the necessary investigation. An active leak requires faster action than a small, old discoloration.
The well-known six-week period applies primarily to proceedings regarding serious defects before the Rent Commission. The tenant must report the problem in writing and, in principle, give the landlord six weeks to remedy it before submitting a request. This does not mean that a landlord can leave an urgent danger unaddressed for six weeks.
If a promised repair fails to materialize, confirm this again via email. Take new photos if the spot grows. This creates a timeline showing that it was not a single isolated report. Our explanation regarding overdue maintenance in a rental home show how to build such a file.
Can you get a rent reduction for mold?
Yes, a temporary rent reduction may be possible if the mold constitutes a serious defect and the landlord does not take sufficient action after a proper report. The Rent Commission or subdistrict court judge examines the cause, severity, duration, and consequences for the use of the home. The reduction generally lasts until the serious defect has been remedied.
A rent reduction is not the same as an order to the landlord to remove the mold. The Rent Commission can temporarily reduce the rent, but cannot enforce repairs in the same way as the subdistrict court. If you primarily want the cause to be remedied quickly, a different or additional route may be necessary.
| What do you want to achieve? | Possible route | What do you have to prove? |
|---|---|---|
| Temporary rent reduction due to severe mold | Rent Commission or subdistrict court, depending on contract and situation | Defect, timely notification, cause, severity and duration |
| Enforcing repair of the cause | Sub-district court judge; sometimes the municipality can enforce | That repairs are necessary and are at the landlord's expense |
| Claiming compensation for damaged items | Liability claim, insurance, or subdistrict court | Amount of damage, cause, connection and liability |
| Health or emergency advice | General practitioner/Public Health Service and, in the event of a structural hazard, the municipality | Complaints and factual circumstances; medical assessment is separate from rent reduction |
Determine in advance which procedure is appropriate. On our page about rent reduction in the event of defects you can have your situation assessed and start an application.
Mold in a privately rented home or an unregulated-sector rental home
In the case of mold in a private rental property or a free-market rental property, the landlord is also required to repair defects for which he is responsible. The difference lies primarily in the procedure. The options at the Rent Commission are more limited in the free market sector and may depend on the rental agreement. For a binding decision regarding repairs, rent reduction, or damages, the sub-district court may be required.
That makes a solid case file all the more important. The subdistrict court judge can consider the statutory defect regulations, the notification to the landlord, and the impairment of the enjoyment of the dwelling. In a case handled by Huurteam Nederland, a former tenant received a rent reduction of over 9.000 euros following proceedings. The success story about rent reduction after moving also shows why paying less rent in advance yourself remains risky.
Are you allowed to pay less rent yourself?
Do not lower or stop the rent on your own initiative. Even if the mold is severe, the landlord can claim the withheld amount as rent arrears. A legal claim for suspension, set-off, or rent reduction involves conditions and risks. Have this assessed in advance.
In the meantime, continue paying the agreed rent, unless there is a valid agreement or decision in place. Focus your energy on evidence, a clear notice of repair, and the correct procedure. This provides a much stronger starting position than payment arrears around which the dispute subsequently revolves.
Damage caused by mold in the rental property
Clothing, a mattress, curtains, books, or flooring can be damaged by moisture and mold. This damage is not automatically reimbursed simply because mold is present. You must demonstrate what is damaged, the value or repair costs, the cause of the damage, and why the landlord is liable for it.
Take photos before you throw away items and keep proof of purchase, quotations, and invoices. Also report damage to your contents insurer in a timely manner. The Rent Commission does not address compensation for movable property; for that, an insurance or civil route is often required.
A rent reduction compensates for reduced use of the home. Compensation for damages concerns specific items of damage. On our page about compensation for reduced living comfort we will explain that difference further.
Mold and health problems
Damp living conditions and mold are associated with an increased risk of respiratory complaints and worsening of asthma, among other things. This does not mean that every complaint is automatically caused by the home. Discuss persistent or severe symptoms with your GP and mention that there is dampness or mold in the house.
De Information from the RIVM about moisture in homes describes the health risks. In some municipalities, the GGD can offer advice regarding the indoor environment, but does not resolve the structural problem itself and does not decide on rent reductions.
What makes a mold case strong?
The best mold cases are not a folder full of loose screenshots, but an understandable timeline. Date the first discovery, every report, inspection, cleaning, and return of the mold. Add a few clear photos for each moment. Note who came to look and what that person said about the cause.
- Photos of the entire wall and close-ups of the spot.
- A measuring tape or recognizable object to show the size.
- Notices to the landlord and proof of receipt.
- Work orders and reports from plumber, ventilation company, or inspector.
- A simple ventilation and temperature diary.
- Photos after the wall has been cleaned and when the mold returns.
- Receipts and photos of damaged items.
Paintwork that turns black again or a damp spot that returns after every rain shower often reveals more than a one-off assessment. Therefore, during an inspection, do not just ask for cleaning, but for a written conclusion regarding the cause.
Mold in your rental home and no solution?
Have your photos, reports, and rental agreement reviewed before you lower the rent yourself. Huurteam Nederland assesses whether mediation, the Rent Commission, or the sub-district court is appropriate for your situation.
Frequently asked questions about mold in a rental home
Who is responsible for mold in a rental home?
That depends on the cause. The landlord is likely to be liable for mold in the event of a leak, rising or penetrating damp, a thermal bridge, or a technical defect in the ventilation system. The tenant is required to ventilate and heat normally and keep vents clean. Because both causes can coincide, a technical investigation is often decisive.
Does the landlord have to remove black mold?
The landlord must remedy the cause if the black mold stems from a defect for which he is responsible. Simply cleaning or repainting is usually insufficient in such cases. If the mold develops primarily because existing ventilation facilities are not being used or the property is insufficiently heated, the responsibility may lie with the tenant.
What can I do about mold in my rental home?
Take photos before cleaning, report the mold in writing, and ask the landlord to investigate the source of the moisture. Continue ventilating and heating as usual, and keep responses and work orders. If the mold returns or repairs are not carried out, have the possibility of a rent reduction or repairs assessed through the subdistrict court.
Can I get a rent reduction due to mold?
Yes, a temporary rent reduction may be possible if the mold is a serious defect, is not attributable to the tenant, and the landlord fails to take sufficient action following a written notification. The cause, extent, affected area, and supporting evidence determine the outcome. Do not reduce the rent yourself, but initiate the appropriate procedure.
How large does a moldy spot need to be for the Rent Commission?
In the Defects Book of July 2026, the Rent Commission generally applies 0,25 m² as the limit for a serious defect for certain mold and damp spots in living spaces. That is approximately 50 by 50 centimeters. Surface area alone is not sufficient: cause, location, and technical condition also count.
How do I report mold to my landlord?
Send an email or letter stating the exact location, extent, start date, and consequences of the mold. Include photos and request an investigation into the source of the moisture, an inspection date, and a lasting repair. Save the sent report and every response. Reporting only by telephone often provides insufficient evidence later on.
Does the landlord have six weeks to remove mold?
Not in every situation. The general repair period must be reasonable and depends on the severity and urgency. The six-week period is particularly relevant before a tenant initiates defects proceedings with the Rent Commission. In the event of an active leak, danger, or rapidly growing damage, the landlord must act sooner.
What can I do if the housing association does nothing about the mold?
Repeat the notification in writing, request the technical cause, and build a file with photos and work orders. After the applicable repair period, you can have it assessed whether a Rent Commission procedure, complaints committee, municipal report, or procedure before the sub-district court is appropriate. Continue paying the rent as long as no valid reduction has been established.
Can I claim back for damage to clothing and furniture?
That is sometimes possible, but not automatically. Document the items and mold, keep proof of purchase, and report the damage to your insurer and landlord. You must be able to substantiate the cause, liability, and extent of the damage. The Rent Commission does not reimburse movable property; a different route is required for that.
What can I do about mold in a private sector rental home?
In the private sector as well, the landlord must repair defects for which he is responsible. Report the mold in writing and gather evidence. The Rent Commission has more limited options in the private sector; for a binding decision regarding repairs, rent reduction, or damages, the sub-district court may be required.
Can the Municipal Health Service determine that I am sick due to mold?
The GGD can advise on damp, mold, and the indoor environment, but does not automatically establish legally that complaints were caused by the home. Discuss medical complaints with your GP. In addition, for a tenancy case, the technical cause, extent, written notification, and the landlord's response are important.
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