Selling a Maine Home After Mold: What to Disclose and Keep

Maine Listings released the August numbers on Friday: 1,542 single-family homes sold statewide, down about 10 percent from August 2025, with the median price up to $424,550. The association’s president said buyers now have more inventory and more room to negotiate. If your house has had a mold problem, the question we hear this time of year is some version of: do I have to tell them, and what do I need to have in hand when I do?

Here is how we answer it from the remediation side. We are not lawyers or brokers, and the disclosure questions belong with yours. What we can speak to is what happens when the mold paperwork is thin, because we get the call after the buyer’s inspection.

What Maine law actually asks for

Maine’s residential property disclosure statute, 33 M.R.S. §173, never uses the word mold. It requires the seller to disclose the water supply, the heating system, the waste disposal system, hazardous materials such as asbestos, lead paint, radon and underground oil tanks, flood history, and, on its own line, “any known defects.” Mold you know about lands under that last line. The wet basement that produced it can land under several. Under §174 the statement has to reach the buyer no later than the time they make an offer, and a buyer who receives it late can withdraw within 72 hours without penalty.

The Maine Real Estate Commission’s guidance to brokers describes a material defect as “a physical condition of the property that is significantly adverse,” says the form should carry no blanks or unchecked boxes, and lists fines of $1,000 to $5,000 handed to licensees over incomplete disclosures. The point for you as the owner: “unknown” is a legal answer when it is true. “Fixed” is a much better answer, if you can back it up.

A fixed problem versus a story about one

A buyer’s inspector will find the evidence whether or not you mention it. A pin meter reads 22 percent in a sill that looks dry. Staining on the underside of the subfloor shows through the crawlspace hatch. A fresh coat of paint on one basement wall and not the other three raises the question by itself. The inspector’s report wins over your account unless you have a paper trail.

When we close a job in Gorham or anywhere in the Portland area, the file we hand the owner has five parts: photos before, during and after; the moisture readings that established the source and the readings on the day we finished; the scope, meaning what came out, what was cleaned and what was sealed; the fix on the water source, whether that was a gutter, a grade change, a sump or a plumbing repair, with that contractor’s invoice; and a plain statement of what testing was and was not done. EPA’s guidance defines a finished cleanup as one where the water problem is fully fixed, visible mold and odor are gone, a revisit shows no new growth, and people can occupy the space without complaints. EPA also notes surface sampling may be useful to confirm an area was adequately cleaned, and that it should be done by someone with experience designing sampling protocols. We put all of that in writing because a buyer’s agent will ask for it.

If you are listing this fall, plan in this order

Fix the water first. EPA’s line is that if you clean up the mold but do not fix the water problem, the mold most likely comes back. In practice it comes back between listing and inspection, and now the buyer has photos of active growth next to your disclosure saying it was handled.

Size the job honestly. Under about 10 square feet on a hard surface, EPA says most owners can clean it themselves with detergent and water, and that is a fair answer to put on the form. Do not paint or caulk over it. Paint over mold peels, and a stained joist under fresh white is the fastest way we know to turn a small disclosure into a big one. Read our note on what a remediation scope should say before you sign one, and if the job is over $3,000 Maine requires a written contract anyway.

Put the packet with the disclosure. Photos, readings, invoices, the water fix. A buyer who sees the problem, the cause and the correction in one folder tends to move on to the next item. A buyer who sees “basement mold, remediated” with nothing behind it tends to order their own testing and ask for a credit.

Keep the humidity down through showings. September and early October in southern Maine still bring warm, wet afternoons against a slab that has cooled off. EPA’s target is below 60 percent relative humidity, ideally 30 to 50, and a $10 to $50 meter tells you where you stand. A basement that smells musty on a Saturday open house undoes the packet.

Landlords selling with tenants in place

If the building is occupied, the tenant side runs on a separate clock. Since July 29 mold is part of Maine’s warranty of habitability, and the inspection and notification duties in the new rental mold law apply while you own the building, sale pending or not. A buyer of a tenanted building will want the same packet plus the tenant correspondence.

When you do not need us

A small patch on a hard surface with the source already fixed is a homeowner job, and the disclosure can say exactly that. If the growth is larger, you cannot find the source, or you need documentation a buyer’s agent will accept, start with a free assessment. Our cost page covers what typical jobs run. Tyler Chandler holds a Maine Board of Pesticides Control commercial applicator license, and every job is written up so it holds up at a closing table. Call (207) 464-8202.