Quick answer Put the request in writing (email, not a phone call), cite the moisture and mould risk, and give a 14–30 day deadline. In most places a landlord must provide adequate bathroom ventilation, and a window that opens may or may not satisfy that. While you wait, a portable dehumidifier plus a squeegee keeps the room dry without touching the property.

On this page

  1. Why landlords say no (and what changes their mind)
  2. What the law usually requires
  3. How to ask in writing (template)
  4. The escalation ladder if they refuse
  5. Renter-safe fixes while you wait
  6. What NOT to do
  7. Fix it yourself vs push the landlord
  8. What to buy first

Why landlords say no (and what changes their mind)

When a landlord refuses to install a bathroom fan, the reason is almost always cost and disruption, not malice. A proper ducted fan means an electrician, a hole through an external wall or the roof, and a day of work. In a building where the bathroom sits in the middle of the flat with no external wall nearby, the job can run into four figures.

What changes a landlord's mind is not a complaint about comfort. It is a complaint about damage to their asset. Mould in a bathroom spreads into the ceiling, the plasterboard and the wall behind the shower, and remediation costs far more than a fan. When you frame the request as protecting the property rather than as a personal inconvenience, the conversation shifts.

Three things move a landlord fastest:

  • Photographic evidence of mould or peeling paint, dated.
  • A written request that creates a record, in case the issue escalates.
  • A reference to the local housing code, which puts the obligation on them rather than on your goodwill.

What the law usually requires

In most jurisdictions a landlord must provide adequate ventilation for a bathroom. The detail matters: in many places a window that opens can satisfy the rule, which means a bathroom with a working window may not legally require a fan at all. A fully sealed bathroom with no window and no fan is a different story — that is usually a defect the landlord is responsible for fixing.

Building codes such as the International Residential Code and ventilation standards such as ASHRAE 62.2 treat bathrooms as high-moisture spaces that need exhaust of roughly 50 CFM for a standard bathroom. Local housing codes then translate that into a landlord obligation. The exact wording varies by city and state, so check your local housing authority's rules before you quote anything.

Check your lease too Some leases explicitly list ventilation as a landlord responsibility. If yours does, quote the clause in your request — it is the strongest lever you have.

How to ask in writing (template)

Send this by email so there is a dated record. Keep it factual and unemotional.

Request template Subject: Request for bathroom ventilation repair — [address], unit [number]

Hi [name],

I am writing to report that the bathroom in my unit has no working exhaust fan and no openable window. After showers the room stays damp for hours, and I have noticed [mould in the grout / peeling paint on the ceiling / a persistent damp smell].

Adequate bathroom ventilation is a landlord responsibility under [local housing code / the lease clause on page X]. Could you arrange for a fan to be installed, or let me know how you would like to proceed? I would appreciate a response within 14 days.

I have attached dated photos. I am happy to provide access at any time.

Thanks,
[your name]

Attach photos. Keep a copy of the email and note the date you sent it. If the landlord replies by phone, follow up with an email summarising what was said — "just to confirm what we discussed…".

The escalation ladder if they refuse

Escalate in order. Each step creates a record that makes the next one easier.

  1. Written request with a 14–30 day deadline.
  2. Follow-up email if the deadline passes, referencing the first request.
  3. Local housing authority — many cities have a rental inspection or code enforcement office that will inspect and order repairs.
  4. Tenants' rights organisation for advice specific to your jurisdiction.
  5. Repair-and-deduct — only where local law allows it, and only with advice in writing first.
Do not withhold rent without advice Withholding rent is a legal step with strict conditions and can lead to eviction if you get it wrong. Get advice from a tenants' rights organisation before you do it, and keep paying until you have that advice in writing.

Renter-safe fixes while you wait

You do not have to live with a damp bathroom while the request works its way through. Every option below is removable and deposit-safe.

FixMoisture removedCostDeposit risk
Portable dehumidifierHigh$60–$200None
Squeegee + towel dryMedium$5–$12None
Window fan (if you have a window)Medium$20–$60None
Moisture absorberLow–medium$10–$25None
Ductless recirculating fanLow$40–$120Low (removable)
DIY wiring a fan yourself——High — do not
Renter-safe fixes while you wait for the landlord

What NOT to do

  • Do not wire a fan yourself. Modifying the electrical system in a rental is a lease breach and a fire risk, and it can void your deposit protection.
  • Do not drill through an external wall. That is a structural change, not a repair, and it is the landlord's call.
  • Do not withhold rent without written advice from a tenants' rights organisation.
  • Do not paint over mould. It comes back through the paint within weeks and looks like you tried to hide the problem.
  • Do not let the request go verbal. A phone call leaves no record. Always follow up in writing.

Fix it yourself vs push the landlord

Here is the honest trade-off. Pushing the landlord costs nothing but time and may take weeks. Fixing it yourself with renter-safe tools costs under $150 and works today.

ApproachCostTime to resultDeposit risk
Written request + wait$02–8 weeksNone
Dehumidifier + squeegee now$70–$150Same dayNone
Escalate to housing authority$0Weeks to monthsNone
DIY fan installation$40–$120Same dayHigh
Cost and risk of each approach

The sensible play is both: send the written request today, and buy a dehumidifier so the room stays dry while you wait. That way the mould does not get a head start, and you have a record if the problem recurs.

What to buy first

If you only buy one thing while the landlord deliberates, buy a dehumidifier. It removes water from a sealed room, needs no installation, and moves with you when the lease ends.

Portable dehumidifier for a rental bathroom

Dehumidifier for a Rental Bathroom

★★★★☆ 4.5 · 12,000+ ratings

No installation, no drilling, no landlord permission. Just plug it in and dry the room.

Check Price on Amazon →

Pair it with a squeegee and a refillable moisture absorber, and you have a complete system for under $150 — less than a typical mould-remediation deduction from a deposit.

Frequently asked questions

Can my landlord refuse to install a bathroom fan?
In many places a landlord must provide adequate ventilation, but a window that opens can satisfy the rule. A fully sealed bathroom with no window and no fan is usually a defect they must fix. Check your local housing code.
How do I force my landlord to fix ventilation?
Start with a written request and a 14–30 day deadline. If nothing happens, escalate to your local housing authority or a tenants' rights organisation. Repair-and-deduct is only an option where local law allows it.
Can I install a bathroom fan myself in a rental?
No. Wiring a fan modifies the electrical system, breaches most leases, and is a fire risk. Use renter-safe options like a dehumidifier or window fan instead.
What can I do right now about a damp bathroom?
Squeegee the walls after every shower and run a portable dehumidifier with the door closed for 20–30 minutes. That removes most of the moisture without touching the property.
Is it worth buying a dehumidifier if the landlord might fix it?
Yes. It works today, costs under $150, needs no permission, and moves with you. It also stops mould getting a head start while the request is processed.
Bottom line A landlord who refuses a fan is a problem you can work around. Send the request in writing today, escalate in order if nothing happens, and buy a dehumidifier so the room stays dry in the meantime. That protects your health, your deposit, and your record of the issue.
A

Apartment Air Fix Editorial Team

We test and write about the appliances that break in apartments. Our recommendations are based on hands-on use, manufacturer specs and verified owner reviews — never on commission rates.

Related guides