What Causes Mold Issues Rental Property Disputes?

Mold issues rental property disputes usually happen because tenants see mold as a health and habitability problem, while landlords may see it as ordinary cleaning, poor ventilation, or tenant misuse. The disagreement becomes worse when nobody identifies the moisture source.

Mold can grow in a rental property because of:

• roof leaks
• plumbing leaks
• AC condensation
• blocked AC drain lines
• damp drywall
• poor bathroom ventilation
• flooding or rainwater intrusion
• leaking windows
• high indoor humidity
• wet carpets or underlay
• water damage from upstairs units
• delayed maintenance
• furniture blocking airflow
• tenant drying clothes indoors without ventilation
• tenant failing to report leaks early

The EPA explains that the key to mold control is moisture control, and mold cleanup is not finished until the water or moisture problem has been completely fixed. It also notes that mold may grow on many common building materials when moisture is present.

That is why a rental mold dispute should not be handled as “just wipe the wall.” If the mold returns, smells musty, appears around AC vents, or follows a water stain, the root cause must be investigated.

Who Is Financially Responsible: Landlord or Tenant?

Financial responsibility depends on the cause of the mold, the lease terms, local law, and whether either party failed to act reasonably. In many rental systems, the landlord is responsible for keeping the property fit for normal use and repairing defects that affect the tenant’s use of the property. But tenants also have duties to use the property properly, report damage, and avoid creating preventable moisture problems.

In Dubai, Article 16 of Law No. 26 of 2007 states that unless the parties agree otherwise, the landlord is responsible during the lease term for real property maintenance works and repairing defects or damage that affect the tenant’s intended use of the property. Gulf News and Khaleej Times legal explainers also describe Dubai rental maintenance as generally falling on the landlord when the issue affects the tenant’s intended use, unless the lease or tenant-caused damage changes the responsibility.

For a general non-UAE rental context, Nolo explains that even where a state or city does not have specific mold laws, a landlord may still be liable if mold results from failure to provide safe and livable housing. It also notes that a landlord is generally liable when mold is caused by their failure to maintain the property.

The landlord is more likely responsible when mold is caused by property defects

The landlord may be financially responsible if mold comes from:

• leaking roof
• leaking pipes inside walls
• AC system defects
• blocked or faulty drainage
• exterior water intrusion
• damp walls from building defects
• previous untreated water damage
• poor waterproofing
• mold that existed before move-in
• repeated maintenance delays
• hidden defects not caused by the tenant

In these cases, the tenant should not be expected to pay for full remediation caused by property failure.

The tenant may be responsible when mold is caused by misuse or neglect

The tenant may be financially responsible if mold is caused by:

• not reporting a leak early
• intentionally damaging plumbing or AC parts
• leaving water spills or floods untreated
• drying clothes indoors without ventilation for long periods
• never using bathroom ventilation
• blocking vents or airflow completely
• refusing access for repairs
• creating excessive humidity through misuse
• ignoring visible mold until it spreads badly

This does not mean the landlord can blame the tenant automatically. There still needs to be evidence.

Responsibility can be shared

Sometimes both sides share responsibility. For example, the landlord may need to repair an AC drain issue, while the tenant may need to improve ventilation and stop placing large wardrobes tightly against damp exterior walls. The final cost split may depend on inspection findings, lease terms, and local dispute rules.

How to Determine Legal Liability

To determine legal liability, you need to connect the mold to its cause. A dark patch on a wall does not automatically prove landlord negligence or tenant fault.

Start with these questions:

1. Where is the mold located?
   Mold under a sink, near a ceiling leak, beside an AC vent, or behind a wardrobe may suggest different causes.
2. When did it start?
   Did it appear after rain, after an AC leak, after plumbing repair, after move-in, or after months of high humidity?
3. Was the issue reported early?
   Tenants should report leaks, dampness, and mold quickly in writing. Delayed reporting can weaken a tenant’s position.
4. Did the landlord respond?
   If the landlord ignored a written repair request, delayed inspection, or only painted over mold without fixing moisture, that may support landlord responsibility.
5. Is there a maintenance record?
   AC servicing, plumbing reports, leak repairs, and prior complaints can show whether the problem was structural, mechanical, or behavioral.
6. Is there professional evidence?
   A mold inspection report, moisture reading, AC report, or contractor assessment is more persuasive than opinion alone.
7. What does the lease say?
   Some leases assign minor maintenance to tenants and major maintenance to landlords. But lease terms may not override mandatory local housing duties, depending on jurisdiction.

This is why documentation matters. If the dispute becomes formal, the party with clearer evidence usually has a stronger case.

Actionable Solutions Before the Dispute Gets Worse

The best first step is to stop the mold from spreading while protecting your legal position. Do not destroy evidence, but do not ignore active moisture either.

For tenants

Do this immediately:

• take photos and videos of mold, leaks, stains, and damaged materials
• record the date you first noticed the issue
• write down smell patterns and affected rooms
• check whether the area is damp
• measure humidity if you have a hygrometer
• report the issue to the landlord in writing
• request inspection and repair of the moisture source
• keep copies of all messages
• avoid scraping, sanding, or painting over mold
• avoid actions that make humidity worse
• allow reasonable access for inspection and repair

If there is a small mold patch on a hard cleanable surface, you may clean it carefully after documenting it. But if the wall is wet, soft, musty, or damaged, do not hide the evidence with DIY paint or harsh chemicals.

For landlords

Do this quickly:

• acknowledge the tenant’s complaint in writing
• arrange inspection of the moisture source
• check plumbing, roof, walls, AC, drainage, and ventilation
• send qualified maintenance or mold professionals when needed
• document findings with photos and reports
• repair the water source before cosmetic repairs
• avoid only painting over mold
• confirm when remediation is complete
• give tenant prevention guidance when relevant

A landlord who only tells the tenant to “open the window” without checking leaks, AC, or water damage may worsen the dispute.

Step-by-Step Dispute Actions for Tenants

If the landlord refuses to act or keeps delaying, follow a clear process. Do not jump straight to threats unless the situation is urgent or legally advised.

Step 1: Send a written notice

Send a message or email that includes:

• affected area
• date first noticed
• photos or videos
• description of odor or dampness
• any health or safety concern stated carefully
• request for inspection
• request for moisture-source repair
• reasonable response deadline

Keep it factual. Example:

“Dear [Landlord/Property Manager], I noticed mold growth and musty odor in [room/location] on [date]. The area appears connected to [leak/AC condensation/damp wall, if known]. Please arrange inspection and repair of the moisture source, followed by appropriate mold cleaning or remediation. I have attached photos for reference.”

Step 2: Keep a timeline

Create a simple timeline:

This timeline becomes very useful if the case escalates.

Step 3: Request professional inspection

If the source is unclear, ask for a professional mold or moisture inspection. If you pay for your own inspection, keep the invoice and report. Whether you can recover that cost depends on local law, lease terms, and dispute outcome.

Step 4: Avoid unsafe DIY work

Do not cut open walls, remove drywall, or disturb large mold areas. The EPA says if you hire a contractor, choose someone with experience cleaning up mold and ask them to follow professional guidance.

DIY mistakes can spread contamination and give the landlord an argument that you worsened the damage.

Step 5: Follow up in writing

If there is no response, send a second written notice. Mention the previous date and repeat the request.

Example:

“I am following up on my mold and dampness report sent on [date]. The issue remains unresolved. Please confirm when inspection and moisture-source repair will be arranged.”

Step 6: Check your local rental dispute process

If the landlord still does not act, check your local tenant authority, rental dispute centre, housing department, municipality, or legal aid service. In Dubai, tenant-landlord disputes may be handled through the Rental Dispute Centre, and Gulf News guidance on rental repair disputes advises filing a maintenance case with the relevant authority if the landlord remains unresponsive.

Do not withhold rent, terminate the lease, or deduct repair costs without checking local law or getting legal advice. In many places, doing that incorrectly can hurt your case.

Step 7: Seek medical evaluation if symptoms are involved

If you have persistent coughing, wheezing, asthma symptoms, eye irritation, skin irritation, or worsening respiratory symptoms, speak with a healthcare professional. A mold report does not diagnose illness, but it can support environmental context.

Step-by-Step Dispute Actions for Landlords

Landlords also need a structured process to avoid liability and unnecessary costs.

Step 1: Respond quickly

Acknowledge the complaint and schedule inspection. Silence makes the dispute worse.

Step 2: Inspect the source

Check the likely causes before blaming the tenant. Look at AC, plumbing, roof, windows, bathrooms, kitchens, humidity, leaks, and ventilation.

Step 3: Document everything

Take photos, videos, moisture readings, and maintenance notes. Keep contractor reports.

Step 4: Repair moisture before cleaning

Do not repaint before fixing the water issue. Mold can return and make the landlord look negligent.

Step 5: Use qualified mold remediation if needed

For larger or hidden mold, hire trained remediation professionals. This protects the property and helps show reasonable action.

Step 6: Communicate prevention duties

If tenant habits contribute, explain them clearly in writing. For example, ventilation use, reporting leaks, avoiding blocked vents, or moving furniture away from damp walls.

Step 7: Keep invoices and completion records

If the tenant caused the mold, evidence may support recovering costs. If the landlord is responsible, records show the issue was handled properly.

Possible Mold Remediation Solutions in a Rental Property

The right solution depends on the cause, size, and material affected.

Moisture-source repair

This is always first. It may include plumbing repair, AC drain cleaning, roof leak repair, waterproofing, window sealing, or humidity control.

Surface cleaning

Small mold on hard, non-porous surfaces may be cleaned with appropriate products, wiping, and drying.

Material removal

Moldy porous materials may need removal if they are contaminated or damaged. This may include drywall, ceiling boards, insulation, carpet, underlay, MDF, or swollen baseboards.

AC or duct cleaning

If mold is connected to AC odor, vent growth, dirty coils, drain pans, or duct contamination, HVAC cleaning or AC repair may be needed.

Containment and HEPA cleaning

Professional remediation may include sealing the work area, using HEPA vacuums, air filtration, controlled removal, and safe disposal.

Drying and prevention

Dehumidifiers, ventilation improvement, better drainage, and humidity control may be needed to prevent recurrence.

Post-remediation verification

In bigger disputes, inspection or testing after remediation may help confirm that the visible mold is removed, the area is dry, and the moisture source has been corrected.

How to Avoid Getting Blamed Unfairly

Whether you are a tenant or landlord, the way you behave after discovering mold matters.

Tenants should:

• report leaks and mold early
• avoid creating excess humidity
• use ventilation reasonably
• keep access available for repairs
• avoid damaging property
• keep records of all communication

Landlords should:

• respond quickly
• inspect professionally
• repair defects
• avoid cosmetic-only fixes
• keep maintenance records
• document tenant-caused issues fairly

The central principle is cause and evidence. Whoever caused the moisture problem, ignored it, or allowed it to worsen may become financially responsible.

The Bottom Line

Mold issues rental property disputes are rarely solved by arguing about the mold color or wiping the wall. The real issue is moisture source, responsibility, evidence, and proper remediation.

In general, landlords are more likely responsible when mold comes from property defects, leaks, AC failures, water intrusion, or maintenance delays. Tenants may be responsible when mold comes from misuse, failure to report leaks, preventable humidity, damage, or blocked ventilation. Sometimes responsibility is shared.

The best action is to document the problem, report it in writing, request inspection, fix the moisture source, remediate properly, and follow the rental dispute process if the other party refuses to act. For legal liability, always check your local rental law, lease terms, and qualified legal guidance before withholding rent, deducting repair costs, ending the lease, or filing a claim.