Opinion & analysis

Mould complaints deserve a proper investigation

The first question about mould should concern what is happening and how to address it. Automatically blaming either occupant or landlord is a poor beginning. The strongest reaction does not establish cause. A useful approach connects observations, technical investigation, use and repair agreements. It requires more than a quick cleaning visit or generic ventilation instruction, while leaving room for evidence to change the initial explanation.

In this article
  1. Begin with the moisture
  2. Make ventilation advice specific
  3. Investigation does not predetermine a defect
  4. Separate repair and rent consequences
  5. Turn the occupant’s experience into useful evidence
  6. Look for demonstrable attempts to resolve the problem

Begin with the moisture

The GGD explains moisture and mould prevention. Cleaning the visible surface does not necessarily resolve recurrence. A patch may be evident while its cause remains uncertain. A photograph identifies something worth investigating without independently establishing responsibility for every aspect of the problem.

We would start with location, development and circumstances. Where does mould appear, when does it return and what changed? Are leaks or failed ventilation also present? The mould guide organises these questions. Factual reporting strengthens the request by identifying what is unknown and what investigation should establish.

Make ventilation advice specific

Use of the home reasonably belongs in moisture investigation. The GGD distinguishes continuous ventilation and brief airing. A suggestion simply to open a window says little without knowing available facilities and whether they work. Advice needs a connection to the actual room and system.

This works both ways. Occupants should use facilities appropriately and report failures; landlords should investigate a reported technical limitation instead of repeating identical instructions. Our position takes use and building conditions seriously together. A possible behavioural contribution does not exclude a technical fault, nor does technical uncertainty remove the relevance of appropriate use.

Investigation does not predetermine a defect

A legitimate counterargument is that every report does not prove major maintenance is required. Landlords need to establish conditions and discuss reasonable access. Extent and seriousness can matter. Careful investigation does not promise that every requested measure will prove necessary or that initial suspicions will be confirmed.

That uncertainty supports a concrete next step. Identify the investigator, missing information and how findings will be shared. Describe any disagreement about cause recognisably. A reasoned technical report is easier to discuss than an unsupported message. It creates room to assess solutions without pretending the outcome was known beforehand.

Separate repair and rent consequences

The Rijksoverheid recommends demonstrable reporting before maintenance follow-up. We think the requested result needs equal clarity: investigation, actual repair or assessment of financial consequences. A forceful complaint can still fail to identify which of these is being requested.

The objectives overlap without being identical. The temporary reduction guide distinguishes lower rent from compelled repair. Agreement and sector affect procedure. Independently stopping payment is not a general solution. Obtain assessment when arrangements fail or the investigation and desired remedy no longer address the same question.

Turn the occupant’s experience into useful evidence

Someone living daily with damp need not know construction terminology to deserve a serious response. Personal experience still cannot independently decide every technical or legal issue. Information should bridge those positions: acknowledge the observation and help convert it into questions that can be examined.

The defects-letter tool gathers locations, earlier reports and requested action, without becoming an expert report. Track appointments and changes after repair. Health symptoms require appropriate personal medical assessment, which tenancy guidance cannot supply. The technical record and care for the resident each deserve their own suitable attention.

Look for demonstrable attempts to resolve the problem

We favour an approach where both sides can show efforts to understand and resolve the issue. Occupants should provide concrete reports, relevant information and reasonable cooperation. Landlords should respond substantively, investigate where necessary and explain agreed next steps. That is a practical standard without promising every dispute will disappear.

A useful mould file includes findings and agreements alongside photographs, with observation and receipt dates. Read leaks if water from outside or pipes may be relevant. The eventual objective is usable accommodation. Remaining in an argument about blame alone provides too little direction towards that result.

Sources and editorial accountability

These sources provide the factual and legal background to this opinion article. The positions, assessments and recommendations are editorial.

Sources consulted on

  1. GGD LeefomgevingGGD Leefomgeving — preventing and removing mouldggdleefomgeving.nl
  2. GGD LeefomgevingGGD Leefomgeving — ventilationggdleefomgeving.nl
  3. RijksoverheidRijksoverheid — addressing poor maintenancerijksoverheid.nl

The links open the original publications, usually in Dutch.

Our editorial approach

Read more about your next step

Mould in your rented home: cause, reporting and next stepsA leak in your rented home: limit damage and request repairsDefects, mould or overdue maintenance?Temporary rent reduction for serious defectsCreate a repair request letterBuild your tenancy file

Legal review

Not legally reviewed yet

This version has not been reviewed by a lawyer or legal professional. Checking sources or editing text is not legal approval.

Editorial team Huurrecht in Nederland

We connect explanations to sources and record targeted changes. Legal review is attributed only to the actual reviewed version, with a real reviewer, date and scope. Human legal review of these articles remains open.

Ricardo van der Spoel

Ricardo van der Spoel

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