HOA and Condo Mold: Who Pays, Unit vs Common Element

Updated September 5, 2026 | Brad Fishbein Table of Contents

Mold in a condo or HOA building is first a question of whose component got wet, then a question of whose contractor opens it. Interior finishes and the drywall you see from inside the unit are often the owner’s job. Shared pipes, the roof, exterior walls, corridors, and building HVAC are often common elements, which means the association. The governing documents control, not a hallway opinion. Document the growth, give the association written notice, and do not DIY a common element. Indoor growth still means moisture. Color is not a diagnosis. Species ID is lab work.

I am a licensed mold assessor. I have stood in units where the owner paid to replace the same bathroom ceiling three times because the roof above the stack was never the association’s priority. I have also stood in units where an owner cut into a wet party wall and flooded the neighbor. The paper you send in week one is cheaper than either of those.

This is not legal advice. Read your declaration, bylaws, and any moisture or mold policy. Talk to an attorney who works association law in your state if the board will not move.

Unit versus common element

Associations split property into three buckets. Names vary. The idea does not.

Component	Typical classification	Who usually handles mold on it
Paint, interior trim, cabinets, flooring you installed	Unit (or unit improvement)	Owner
Drywall on the interior face of a perimeter or partition wall	Often unit, sometimes to the unfinished surface	Owner for the finish; association if the wetness came from a common leak
Party walls, floor/ceiling assemblies between units	Common or limited common	Association, with access through your unit
Roof, exterior cladding, windows in many high-rises	Common	Association
Unit HVAC (in-unit air handler, PTAC)	Often unit	Owner, unless the association maintains them by rule
Building chiller, corridors, shared ducts, cooling towers	Common	Association
Supply lines in a wall that serve only your unit	Split: some docs say unit, some say common	Read the definition of “pipes”
Stacks, mains, and lines that serve more than one unit	Common	Association

Limited common elements (your balcony, a limited patio, sometimes windows or a limited HVAC closet) sit in the middle. The association may own them and still bill you for upkeep. Mold on a limited common balcony that leaked into the bedroom is how people spend a year pointing at each other.

The moisture source decides the politics even when the growth is on “your” drywall. If a common roof or a common stack wet your ceiling, you still photograph your ceiling, but the repair of the source is not a weekend project you owe the building. If your overflowing AC pan wet your own closet, that is usually you.

EPA does not care who pays. EPA cares that the water is fixed and that porous material with growth is discarded. “If you clean up the mold, but don’t fix the water problem, then, most likely, the mold problem will come back.”

What to do in the first week

Photograph and log. Wide shots, close-ups with scale, the suspected leak, and every communication. Same discipline as documenting mold.
Stop DIY on anything that might be common. Do not open a ceiling under a roof, a party wall, or a mechanical closet the association maintains. You can cut a fire-rated assembly, a waterproofing, or a neighbor’s finish.
Write the association and the manager the same day. Location, photos, whether water is active, and a request to inspect the common source. Copy your own insurance if the leak is sudden.
If you rent the unit out, notify the tenant in writing that you have notified the association. Tenant habitability is a separate duty. See tenant mold rights and landlord won’t fix.
If you are buying or selling the unit, disclosure still applies. See mold disclosure, buying a house with mold, and selling a house with mold.

Small hard-surface growth inside the unit, under about 10 square feet, with a moisture source you control (a steamy bath fan you own, a plant saucer) can be your cleanup under EPA’s DIY threshold. Wear an N-95, gloves, and goggles. Drywall, hidden growth, HVAC, and sewage are not DIY, and they are not “the HOA will paint it.” See DIY or professional.

Independent inspection before the blame fight

Boards delay when the only evidence is an owner saying the bedroom smells. An independent mold inspection at $300 to $600 gives moisture readings, photos, and a sentence about whether the wetness appears to come from above, from a wall cavity, or from an in-unit source. The assessor should not be the remediator who wants the job.

Ask the report to state:

Affected square footage and materials.
Whether growth is hidden, on porous goods, or in HVAC. EPA lists the back of drywall, under carpet, and above ceiling tiles as hidden locations, and says not to run a contaminated HVAC system.
The likely moisture path, with the caveat that walls may need to open to confirm.

CDC does not recommend sampling just to name household mold. A tape lift still helps when a board says “that’s dirt.” Species ID is lab work. Do not tell the board the building is full of “toxic black mold” because a stain is dark. That language slows the repair.

Send the report with a second notice. Ask in writing for the association to open the common assembly if the moisture path points there, and for a timeline.

Who pays for remediation

Once the source is identified, money follows the documents and, often, insurance.

Owner-side costs usually include in-unit finishes, contents, and sometimes the drywall if the docs say the unit includes the unfinished interior surface. If your negligence caused the water (overflowed tub, ignored AC pan), expect the association to bill you for common-element repairs too.

Association-side costs usually include the roof, exterior, shared plumbing, and common HVAC, plus the drywall they have to open to reach those things. Some declarations require the association to restore the unfinished common assembly and the owner to restore finishes. That split is how you get a repaired stack and a bedroom with no ceiling paint.

Insurance is a third bucket. Your HO-6 policy may cover sudden water in the unit, often with a mold sublimit. The association’s master policy may cover the building. Neither policy likes slow leaks or poor maintenance. The Insurance Information Institute’s general rule is that standard policies exclude mold from lack of maintenance. Sudden discharge can be different. See mold insurance and insurance claims. Put both carriers on notice early. Do not wait for the board meeting.

Professional mold remediation cost for most jobs is $1,200 to $3,750, averaging about $2,300 to $2,400, or $10 to $25 per square foot of affected area. In a condo the number climbs when the contractor needs after-hours access, elevator pads, corridor containment, and work in a neighbor’s ceiling. HVAC involvement is often $3,000 to $10,000. Use the mold calculator for a unit-level estimate, then expect the building add-ons.

Demand clearance testing by an independent assessor before the plastic comes down, especially if the work crossed a corridor or a party assembly. Neighbors will ask. A clearance report is the answer.

Where the state licenses mold remediators, the association should use a licensee. Check mold laws.

Do not DIY common elements

Owners who mean well cut a hole in a wet ceiling and find a common pipe. Then they have an open fire assembly, a wet neighbor, and a board that will bill them for the rest of the repair.

Do not:

Open roofs, exterior walls, or party walls.
Service building HVAC, shared ducts, or cooling towers.
Run ozone or fogger machines into corridors. See mold fogging.
Keep running an in-unit handler that is pulling from a wet common plenum. EPA: do not run an HVAC system you know or suspect is contaminated.

You can, inside the unit you control, dry personal property, run a dehumidifier, and clean small hard-surface patches after you have photographed them. You cannot make the association’s leak go away with vinegar.

If a contractor the association hired is working in your unit, ask for the scope in writing, for containment that protects your contents, and for who pays if they open more wall than planned. Photograph the unit before they arrive.

Health and occupancy

CDC: damp, moldy environments may cause health effects or none at all. People with asthma or mold allergy may have severe reactions. Immunocompromised people and people with chronic lung disease may get infections in their lungs from mold. If someone in the unit is in a higher-risk group, put that in the notice as an occupancy fact and ask the association not to delay source repair. EPA says consult a health professional before cleanup if you have health concerns.

Relocation during a large job is a documents and insurance question: loss-of-use on your HO-6, association responsibility if they made the unit uninhabitable, or neither. Do not assume someone is paying for a hotel until it is in writing.

Final Thoughts from Brad

In a house, you hire the plumber and the remediator. In a condo, you hire the file. Notice the association, identify the wet component, and refuse to be the person who bleaches a ceiling under a roof leak.

If the growth is on your tile and your fan, that is you. If the growth is on a ceiling under a common roof, that is a building problem that happens to be visible in your unit. Mix those up and you will pay twice.

Frequently Asked Questions

Does my HOA have to pay for mold in my condo?

Only if the moisture source or the affected component is the association’s under the governing documents. Interior finishes are often yours. Roofs, shared pipes, and building HVAC are often theirs. Wet drywall from a common leak is the usual gray zone. Read the declaration.

Can I hire my own remediator in a condo?

For work limited to your unit finishes, often yes, subject to association contractor rules and insurance. For common elements, no. The association has to control those assemblies. Do not open them yourself.

Should I wait for the next board meeting?

Not if water is active. Send written notice immediately, photograph, and call management. A monthly meeting is not a water-extraction plan. Follow up with an independent inspection if they stall.

Is a bleach wipe enough to satisfy the association?

No. EPA does not recommend bleach as a routine mold cleanup method, and porous materials with growth may have to be discarded. A wipe without a moisture repair is why the same ceiling fails again.

Do I need species testing for an HOA claim?

CDC does not recommend sampling just to name household mold. Moisture mapping and a written scope matter more. A lab result can help if the board denies that the stain is mold. Color is not a diagnosis.

Sources

A Brief Guide to Mold, Moisture and Your Home (EPA) — 10 square foot DIY threshold, moisture control, discarding porous materials, HVAC caution
Mold Remediation in Schools and Commercial Buildings Guide: Chapter 3 (EPA) — hidden mold locations, containment, do not run a contaminated HVAC system
About Mold and Moisture (CDC) — damp indoor environments may cause health effects or none at all; asthma and allergy reactions
Which disasters are covered by homeowners insurance? (Insurance Information Institute) — mold and maintenance exclusion
Can mold cause health problems? (EPA) — allergens, irritants, asthma attacks in people with asthma who are allergic to mold

Explore Related Topics:

Mold Detection Guides

Meet the author

Brad Fishbein is an ACAC council-certified Microbial Investigator. In the fall of 2012, he became a Licensed Mold Assessor in the State of Florida through the Department of Business & Professional Regulation. Brad has helped homeowners with over 5,000 successfully completed Mold Inspections since 2009.

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