By Daniel Stih, founder of Healthy Living Spaces & host of the Mold Money Podcast
If you’ve discovered mold in your home, one question instantly rises to the surface: How do I get rid of it—permanently?
Unfortunately, the mold remediation industry is filled with confusion, outdated guidelines, and—far too often—expensive mistakes. After years as a mold investigator and expert witness, I’ve watched homeowners spend tens or even hundreds of thousands of dollars on projects that were done wrong.
The truth is simple:
Mold remediation isn’t complicated. But it must be done correctly—or not at all.
This article breaks down what “getting it right” really means—how to remove mold, how to hire the right people (or do it yourself), how much it should cost, and how to make sure the mold is truly gone.
Step 1: Fix the Source of Moisture
Mold removal means nothing if you don’t eliminate the moisture problem that started it.
It can come from:
- A roof leak
- A bad window
- An unsealed shower
- Plumbing leaks
- Condensation issues
- Crawlspace humidity
- Flooding
- Air conditioning malfunctions
If the material stays wet, the mold will grow back—no matter how perfectly you “treat” it.
This is non-negotiable.
Step 2: Understand What “Removal” Actually Means
Mold remediation has a professional standard: the ANSI/IICRC S520.
According to this standard, the only way to get rid of mold growth is to remove it.
Forget “killing” it. Forget miracle sprays. Forget vinegar, bleach, fogging, or magic chemicals.
Mold removal depends on the type of material:
1. Non-porous (metal, glass, tile)
Just scrub with soap and water. You’re done.
Example: Mold on a window.
2. Semi-porous (wood framing, OSB, concrete)
You must sand, wire-brush, or aggressively clean the surface until the growth is physically removed.
3. Porous (drywall, insulation, carpet, cabinets with particleboard)
These must be removed and thrown away.
There is no safe or effective way to “treat” porous materials.
This isn’t my opinion. This is the industry standard.
Step 3: Should You Clean Mold Yourself?
The EPA guidelines—and many state rules copied from them—recommend choosing DIY vs. professional remediation based on square footage.
This is flawed.
Because the visible mold is almost never the full extent of the problem.
If you see one square foot on a wall, it’s not unusual to find 10–20 times more inside the wall once it’s opened.
Base your decision on:
- Your comfort level doing the work
- Your ability to follow steps
- Whether you can trust a contractor
- Whether you can supervise the work
Not on the size of the spot on the wall.
Sadly, many professionals do poor work. That’s why I wrote Mold Money: to save homeowners thousands by showing them the right way to remediate—whether they do it themselves or hire help.
Step 4: What Mold Remediation Really Involves
Every mold remediation project—no matter the size—requires these elements:
Containment
Think dust control, not “mold control.”
Containment is simply:
- Hanging plastic from floor to ceiling
- Creating a sealed work zone
- Ensuring debris and dust stay inside that zone
You do this to protect the rest of the home from contamination.
Air Scrubber / Negative Air Machine
These are the same thing: a HEPA-filtered machine that exhausts air outside, creating suction.
It works like a giant vacuum that keeps dust from escaping the containment.
You can even buy your own air scrubber and provide it to your contractor if they don’t have one.
Removal of Materials
This is the core of remediation:
- Remove porous materials
- Sand or wire-brush semi-porous materials
- Wipe non-porous materials with soap and water
Cleaning the Work Area
After removal, everything must be cleaned with:
- Soap and water only
- HEPA vacuum
NEVER fogging machines.
NEVER fragrant “mold treatments.”
NEVER chemicals not listed in your contract.
99% of failed remediations happen because the area was not properly cleaned.
Step 5: How Much Should Mold Remediation Cost?
When you Google it (or ask AI), you’ll see:
$1,500 to $10,000
Real-world?
$5,000–$100,000 for a typical problem.
The only factor that should honestly increase the cost is how much material needs to be removed.
Not the mold.
Not the testing.
Not the scare tactics.
Tearing out cabinets costs money.
Cutting open multiple rooms costs money.
You’re not paying to clean mold.
You’re paying for demolition and labor.
Step 6: Mold Removal vs. Mold Remediation
There is no difference.
Remediation means removal.
Removal means remediation.
If mold growth is present, you remove it. End of story.
Every situation is different. That’s why I offer consulting — to help you decide what’s best for your home, your health, and your budget.
Step 7: How Long Should It Take?
A real, correctly done remediation usually takes:
- Day 1: Set up containment and air scrubber
- Day 2: Remove materials
- Day 3: Let dust settle overnight and perform final cleaning
The rebuild is separate and can take weeks—but remediation itself is typically 2–4 days.
Step 8: Is It Safe to Stay in the House During the Work?
AI often answers:
“Leave the home if there is significant mold or chemical use.”
Two problems:
1. “Amount of mold” is irrelevant.
Once containment is set up, it doesn’t matter if there's a little or a lot.
2. There should be no chemicals used.
Only soap and water.
The real reasons you might leave:
- Air scrubbers are loud
- Workers walking in and out
Otherwise, you can stay— and many people prefer to supervise the work themselves.
Step 9: How to Know the Mold Is Truly Gone
Most companies answer this with:
“We’ll do air sampling.”
This is wrong.
Air samples do NOT tell you if mold was successfully removed.
You confirm successful remediation with this 3-step checklist:
1. No odor
A musty smell means mold remains.
2. Visual inspection
It should be spotless.
You should be able to eat off the floor.
3. Microscopic inspection
A trained inspector examines surfaces directly.
If mold is present on wood or framing, you reopen the case and fix the problem.
Air samples are optional—never the primary test.
Real Example: My Grandmother’s House
My grandmother was becoming forgetful. Doctors thought it was Alzheimer’s.
I found a small amount of mold behind her stove. I removed it—but the odor remained.
So I kept going:
- Removed cabinets
- Removed drywall
- Cut into the floor
- Found an entire underfloor cavity full of mold
It was far worse than the small area originally visible.
Only after full removal did her symptoms improve drastically.
Had I relied on air testing alone, the mold would never have been found.
Final Advice: How to Protect Yourself
Before hiring a contractor:
- Ask exactly what materials will be removed
- Ask about containment—where and how
- Ask what chemicals they plan to use (correct answer: none)
- Insist on seeing the work before they close containment
- Make sure the final area is clean, odor-free, and visibly mold-free
And remember:
If the area is dusty, it’s not done.
If it smells musty, it’s not done.
If you wouldn’t eat off the floor, it’s not done.
Mold problems don’t need to ruin your life—or your finances. With the right information, you can get it done right the first time.
If You Need Help :
- Ask a question
- Book a consultation
- Get step-by-step guidance
- Avoid unnecessary costs
- Get clarity before hiring anyone
Every situation is different. That’s why I offer consulting and DIY Mold Remediation Coaching — to help you decide what’s best for your home, your health, and your budget.