MoldHelpUSAOur editorial team researches mold, moisture, and indoor air quality using guidance from the EPA, CDC, state licensing boards, and industry standards such as IICRC S520. Every guide and city page starts from primary sources: NOAA climate normals for rainfall, Census housing data for the age of local homes, FEMA flood maps, and the current text of each state's licensing and landlord-tenant laws. When a number appears on this site, it comes from one of those sources or from a named price guide, and when we cannot find reliable data, we leave it out rather than estimate. We write for homeowners and renters who need to decide what to do next, so each page explains what is usually safe to handle yourself, when a professional is worth calling, and what insurance tends to cover. Pages are reviewed when laws, deadlines, or price data change, and the date at the top of each page shows the last update. This site is a free connection service for homeowners; it does not perform mold work, sell testing, or publish customer reviews.
Guides by Editorial Team
Removal & Remediation Mold in a Closet: Causes, How to Clean It Without Spreading Spores, and Prevention Closets grow mold because air does not move and walls stay damp. How to clean it without spreading spores, what to do with clothes, and when it means a leak. 
Removal & Remediation Mold on Window Sills: Why It Grows and How to Get Rid of It Mold on a window sill usually comes from condensation or a leak around the frame. Here is how to clean it by material, how to stop it, and when it means more. 
Inspection & Testing Musty Smell in the House: Causes, Where to Look, and How to Get Rid of It A musty smell almost always means moisture and microbial growth somewhere in the house. Here is where to look, what else causes it, and who to call. 
Removal & Remediation Mold on Subfloor and Under Vinyl Plank Flooring: Signs, Causes, and Fixes Mold on a subfloor or under vinyl plank grows out of sight. Here is how to check, when wood can be cleaned or must be replaced, and why slabs matter. 
Removal & Remediation Water Damage and Mold: What to Do in the First 24 to 48 Hours Mold can start on wet materials within 24 to 48 hours. Here is what to do after a leak or flood, a timeline of what happens next, and when to call a pro. 
Removal & Remediation What Causes Mold in a House? The Moisture Sources Behind It, Room by Room Mold in a house comes from moisture that does not dry: leaks, humidity, condensation, and flooding. Here are the common causes by room and how to stop each one. 
Removal & Remediation White Mold in the House: How to Identify It, What Causes It, and How to Remove It White mold is common in basements, attics, and crawl spaces, and it is often confused with efflorescence. Here is how to tell, what causes it, and what to do. 
Removal & Remediation Black Mold in the Shower: How to Remove It and When It Signals a Bigger Problem Black spots on shower grout and caulk are common and usually easy to clean. Here is how to remove them, when to replace caulk, and when they point to a leak. 
Health & Safety Black Mold Symptoms: What Mold Exposure Can Cause and When to See a Doctor Mold exposure mostly causes allergy-like and breathing symptoms, and some people face higher risk. Here is what the CDC and EPA list, and when to get care. 
Health & Safety Black Mold: What It Is, Why It Grows, and What to Do About It Black mold usually means Stachybotrys chartarum, a greenish-black mold that grows on materials that stay wet. Here is what it is, why it grows, and what to do. 
Removal & Remediation DIY Mold Removal vs. Hiring a Professional: When You Can Do It Yourself Small patches of mold on hard surfaces are often a DIY job; large areas, hidden growth, and AC mold are not. Here is how to tell and how to clean safely. 
Insurance & Costs Does Homeowners Insurance Cover Mold? What Is Usually Paid and What Is Not Homeowners insurance usually covers mold only after a sudden, covered loss such as a burst pipe, and often only up to a set limit. Here is how it works. 
Renters Florida Mold Law for Renters: Your Landlord's Duties, the 7-Day Notice, and Your Options Florida has no mold-specific rental law, but landlords must keep units up to code and in repair. Here is how the 7-day notice works and what your options are. 
Inspection & Testing Free Mold Inspection: What You Actually Get and What to Ask Before You Book A free first visit is usually a visual check and a quote, not lab testing or an independent report. Here is what you get and what to ask before you book. 
Removal & Remediation How to Remove Black Mold Safely: Step by Step, and When to Call a Professional You can remove small patches of black mold from hard surfaces yourself. Here are the steps, what works, what to avoid, and when the job needs a professional. 
Inspection & Testing How to Test for Mold in Your Home: Your Options and When You Can Skip It If you can see mold, you usually do not need a test. Here is when testing helps, the main types of tests, what DIY kits can tell you, and what it costs. 
Health & Safety Is Black Mold Dangerous? What Health Agencies Actually Say Black mold can cause the same allergy and breathing problems as other molds, and some people are at higher risk. Here is what the CDC and EPA actually say. 
Inspection & Testing Do Home Inspections Check for Mold? What Buyers and Sellers Should Know A home inspection notes visible moisture and possible mold but does not test for it. Here is when to add a mold inspection and what to do if mold turns up. 
Removal & Remediation Mold Behind Drywall: How to Tell, What Causes It, and How It Is Removed Mold inside walls usually starts with a hidden leak. Here are the signs, why moldy drywall usually has to come out, how removal works, and what it costs. 
Health & Safety Mold Exposure Testing: What Medical and Home Tests Can and Cannot Tell You Testing for mold exposure can mean testing your body or your home. Here is what doctors use, why urine mycotoxin tests are not recommended, and where to start. 
Removal & Remediation Mold in the Attic: Causes, What It Looks Like, and How It Is Removed Attic mold usually comes from roof leaks, poor ventilation, or moist air from the house. Here is how to spot it, what removal involves, and what it costs. 
Removal & Remediation Mold in the Basement: Causes, Signs, and How to Get Rid of It Basements are a common place for mold because they sit below ground. Here is why it grows, how to tell mold from efflorescence, and how to remove it. 
Removal & Remediation Mold in the Crawl Space: Signs, Causes, Removal, and Encapsulation Crawl space mold grows out of sight but affects floors and air upstairs. Here are the signs, how remediation works, and when encapsulation helps. 
Removal & Remediation Mold in the AC and Air Ducts: Signs, Causes, and How It Is Removed Mold in the air conditioning system can spread odor and spores through the house. Here are the signs, why it grows, what the EPA says about ducts, and costs. 
Insurance & Costs Mold Inspection Cost: What You Pay for an Inspection, Testing, and a Report A mold inspection costs about $300 to $1,000, average near $670. Lab tests add $50 to $350 each. See testing costs, what is included, and how to compare quotes. 
Inspection & Testing What Is a Mold Inspection? How It Works, What It Finds, and When You Need One A mold inspection finds mold and the moisture feeding it. See what happens during the visit, when sampling makes sense, how long it takes, and who can do it. 
Removal & Remediation Mold on the Ceiling: Causes, How to Clean It, and When It Means a Leak Ceiling mold comes from steam in the room or water from above. Here is how to tell which, how to clean a bathroom ceiling, and when the drywall has to go. 
Removal & Remediation Mold on Walls: What It Means, How to Clean It, and When It Is Inside the Wall Mold on a wall can be surface growth or a sign of water inside the wall. Here is how to tell which, how to clean it, and when to call a professional. 
Insurance & Costs How Much Does Mold Remediation Cost? Prices by Size, Location, and Scope Most mold remediation jobs cost a few thousand dollars, but prices run from under $1,000 to $30,000. See costs by size and location and what drives them. 
Removal & Remediation What Is Mold Remediation? The Process, the Timeline, and What Happens After Mold remediation removes mold growth and fixes the moisture behind it. Here is what the process involves, how long it takes, and how to know the job is done. 
Removal & Remediation Mold Under Carpet: Signs, How to Check, and Whether the Carpet Can Be Saved Mold under carpet grows in the pad and on the floor below. Here are the signs, how to check safely, and when carpet can be dried or must be replaced. 
Removal & Remediation Mold vs. Mildew: How to Tell the Difference and What to Do About Each Mildew is a type of mold that stays on the surface, while other molds grow into materials. Here is how to tell them apart, including black mold vs. mildew. 
Renters Does Renters Insurance Cover Mold? Your Belongings, Your Landlord, and Your Options Renters insurance may pay for belongings damaged by mold after a sudden, covered loss. Cleaning up the unit itself is usually the landlord's job. 
Inspection & Testing Signs of Mold in Your House: What to Look, Smell, and Check For A musty smell, stains, peeling paint, and a recent leak are common signs of mold at home. Here is what each one means and where hidden mold tends to grow. 
Health & Safety Types of Mold in Houses: The Common Ones and What They Look Like A few mold types show up in most homes: Cladosporium, Penicillium, Aspergillus, Alternaria, and Stachybotrys. Here is how they differ and what to do. 
Health & Safety What Does Black Mold Look Like? How to Recognize It, and What It Might Be Instead Black mold is usually greenish-black and often looks slimy or sooty, but many molds are dark and some dark stains are not mold at all. Here is how to tell.