Crawl spaces tend to have high levels of moisture and humidity, which is why these spaces are highly prone to mold growth. It is crucial to get rid of the mold immediately to prevent it from spreading all around your home.

Crawl space mold removal cost is around $3,500, ranging between $1,500 and $4,000. At the lower end of the spectrum is a bathroom with the price of $1,000 for mold remediation, while for the whole house of 2,000 sq. ft., the price can go up to $15,000 or more.

Several factors will affect the final cost of your battle with mold in the crawl space. The factors include the location and type of the mold colony.

Let’s clean up your mold!

Description Average cost
National Average$3,500
Average Range$1,500 to $4,000
Low-end $1,000
High-end $15,000
Cost Per Square Foot$15 to $30
Mold Inspection and Testing $450 to $800
Crawl space mold removal cost

Crawl Space Mold Remediation Cost per Square Foot

For mold removal expect to pay from $15 – $30 per square foot or from $500 to $4,000 for the crawl space with the average height.

If your project includes more extensive jobs such as removing mold in crawl space, walls, air ducts, and replacing the contaminated insulation you will have to pay from $2,000 to $6,000 depending on the size and type of the mold, reasons for mold growth, and accessibility.

Mold Removal by Complexity Cost

Type of the mold removalAverage Cost
Crawl space removal - only$500 - $4,000
Crawl space, Air ducts, Walls, Insulation$2,000 - $6,000
Structural damage$10,000 - $30,000

If there is a need for mold testing expect to pay from additional $200 to $400 for a visual inspection and taking samples. Also fixing leaky pipes applies additional fees.

Mold on concrete beams, wood joists, and insulation indicates that water has started to leak or a high level of humidity is present, and you should react immediately.

Crawl spaces are rarely inspected for mold, mildew, and bacteria presence. Most often when the problem is already huge. Spores spread into the walls and HVAC system and penetrate your living space.

It is a well-known fact that exposure to mold can have far-reaching serious consequences and can cause serious health problems such as asthma, allergies, and respiratory issues.

Types of Mold Found in the Crawl Space

Some mold strains are harmless, more or less. While others are highly dangerous to people. Crawl spaces provide perfect conditions for mold to invade and thrive there. The following mold strains are the most common in the crawl space:

Toxic Black Mold

Black mold, also known as Stachybotrys, is definitely the most toxic mold strain on the earth. It tends to grow in areas that have been exposed to water or moisture. Mold remediation companies can ascertain the type of mold in your crawl space.

Toxic black mold

White Mold

This type of mold is very susceptible and difficult to spot because of its white color. Penicillium, Aspergillus, and Cladosporium are among the most common species that grow in the crawl space. When white mold is in a developmental stage it will change color after some time.

White mold

Yellow Mold

Organic materials such as moisture and oxygen are the perfect food for yellow mold. These materials exist in your crawl space and they create a perfect environment for this strain to grow. Yellow mold vigorously attacks wooden structures, causing them to decay and fall apart. That’s why when you notice it growing, call a mold remediation specialist to eradicate it.

Yellow mold

Professional Mold Removal Cost by Type

More than 100 different types of mold exist, each of them differing in appearance, location, side effects, and cost for removal. The more toxic the mold is the higher the price for mold removal will be due to the need for safety equipment.

The table below highlights the most common types of mold and the removal cost, including labor and materials:

Type of moldRemoval Cost
Chaetomium mold removal$500 - $3,500
Ulocladium mold removal$1,000 - $4,000
Alternaria mold removal$1,500 - $5,000
Aspergillus mold removal$1,500 - $5,000
White mold removal$1,500 - $5,000
Cladosporium mold removal$1,500 - $5,000
Green mold removal$1,500 - $5,000
Black mold removal $2,000 - $6,000
Serpula Lacrymans mold removal$2,000 - $6,000
Fusarium$2,000 - $7,000

Four Signs of Mold in a Crawl Space

A humid crawl space provides the perfect environment for mold. It quickly affects the wood, causes structural problems, health issues, and many more damages.

The following four clues are signs of mold presence in your crawl space:

Strong and Musty Odors

If you notice that unpleasant mold odors continually migrate upward and through the foundation wall, and also low indoor air quality, then you have to inspect.

Allergic Reactions

It is very common for mold in the crawl space to cause allergic reactions, running nose, itchy eyes, headaches, and respiratory problems.

Moldy Baseboards

As mold spreads from the crawl space it will affect baseboards on the floor above.

Crawl Space Components Discolorations

The following color-coded clues will definitely indicate mold:

  • Black – Most common molds
  • Green – Maybe Aspergillus, Cladosporium or Penicillium
  • Greenish Black – Slimy in appearance
  • White – Variants of Aspergillus, Cladosporium or Penicillium
  • Brown – Common Aureobasidium pullulans or Pithomyces chartarum
  • Yellow – Wood-damaging Serpula lacrymans or Epicoccum nigrum
  • Orange – Variants of Serpula lacrymans

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Crawl Space Repair

I think that this might be valuable information for you, my reader. If you need to remove mold from your crawl space then repairing and cleaning will be needed too. For cleaning costs, you can read a little below in this article. First, let’s repair your crawl space:)

  1. Foundation repair – $2,000 – $8,000
  2. Wet crawl space repair – $1,500 – $5,000
  3. Structural damage repairing – $1,500 – $4,000
  4. Crawl space insulation replacing – $900 – $3,600
  5. Encapsulation – $1,500 – $15,000

When you reach this point my recommendation for you and your home is a full treatment that includes cleaning, pest control, and installing a dehumidifier, drainage system, and encapsulation. This will help you prevent mold growth in the future.

Foundation Repair

Foundation repairing may require replacing piers or underpinning to raise or increase strength, fixing cracks, releveling the house using mudjacking, or other repairing methods. Foundation repair contractors can charge you from $2,000 to $8,000 or even more for fixing sinking or settling.

RepairAverage Cost
Pier and beams replacing$1,000 - $2,000 per pier
Cracks repairing$250 - $800 per crack
Mudjacking costs$2,000 - $6,000
Foundation walls stabilizing$5,000 - $10,000

Wet Crawl Spaces Repair Cost

Regular clean-up of water-damaged crawl space costs from $1,500 to $5,000. On the other hand, severe flooding in a crawl space can cost you up to $10,000 for removal and repairs. To prevent further issues waterproofing and encapsulation will be needed and for that, expect to pay between $5,000 to $15,000.

RepairAverage Cost
Wet crawl space repairing$1,500 - $5,000
Severe flooding repair $3,000 - $10,000
Damage restoration$500 - $5,000
Drainage system$800 - $3,000
Crawl space encapsulation $5,000 - $15,000

If additional things such as replacing the wet insulation, walls, or remediating mold are needed it can add up to $5,000 or more.

Replacing Support Beam Cost

Engineer’s plan$250 - $400
Beam replacement$1,500 - $4,000

If you need to replace a support beam in the crawl space you will have to pay between $1,500 and $4,000 for structural repairs. The overall cost depends on the beam’s size, weight, material, what it supports, and accessibility. If it can be replaced in place it will cost you 50% less.

A structural engineer’s inspection and design plan for the replacement is required in most locations to get a building permit and start construction

Insulation Removal and Replacing Cost

Type of insulationCost per square footAverage cost
Board/Batts$1.50 - $2.50$900 - $3,000
Spray foam$2.50 - $3.50$1,500 - $3,600

*Prices refer to both removal and replacement of the insulation.

Old and wet insulation is a perfect host for a mold of all types, mildew, and rodent excrement. If your crawl space is properly insulated the energy efficiency of your home will increase. Also, the entry of moisture and outside air will be reduced.

Before you replace the insulation it is very important to perform proper moisture control so trapped moisture is removed and rotting of the wood framing is avoided.

Spray foam insulation is your best option. Its costs range from $1,500 to $3,600 it lasts longer, and it is more moisture-resistant than other forms of insulation. But there is one drawback with spray foam insulation when installed in the crawl space. It can prevent future pipe or electrical repairs and may not be suitable for your crawl space.

Crawl Space Cleaning Cost

The basic crawl space clean will cost you from $500 to $2,000 while deep cleaning that includes mold removal, fungus treatment, sewer water cleanout, or extensive pest control will cost you from $500 to $4,000. Several factors will affect the overall cost of the crawl space cleaning, those are size, condition, accessibility of the crawl space, and type of the cleaning.

Clean upCost
Basic cleaning$500 - $2,000
Mold removal$500 - $6,000
Fungus treatment$500 - $4,000
Asbestos removal$1,200 - 2,800
Sewer water cleanout $1,000 - $5,500
Minor pest removal$200 - $700
Extensive pest control and cleaning$1,500 - $4,000

Get Rid of the Crawl Space Mold Like a Pro – Six DIY Steps

Crawl space mold removal process can be a DIY project. But, it is very important for your safety to be fully protected. That includes a face mask (with OSHA-rated respirator recommended), non-vented goggles, heavy gloves, and throw-away coveralls. I hope that the following steps will help you.

Step 1 - Assess the Situation

When you are fully equipped and protected assess the extent of mold in the crawl space. Set up lights in the crawl space and lay down plastic sheets to catch mold as it’s cleaned from the surfaces. While you are still at this point call in the professionals if the job seems too big.

Step 2 - Use a Foaming Spray

Spray the affected areas with a foamy spray specially formulated for mold. Let it work its magic and loosen the mold, and then begin carefully cleaning the surface.

Step 3 -Soak With a Mold Killer

Soak any remaining thin coats of the mold with a homemade killing mixture. On the other hand, commercial products are more effective, and they will provide you with better mold stains removal.

Step 4 - Scrub Off Residue

First let affected areas dry, and then with a stiff bristle brush scrub away any remaining mold. This can take you some time, but it is very important to remove as much mold as you can.

Step 5 - Dispose of Everything

Fold up all the plastic sheeting that you have used and seal them properly in a heavy thrash bag. Do the same with the rest of the contaminated protective gear such as coveralls and brushes you have used.

Step 6 - Control Crawl Space Climate

Few possibilities are there for you to settle the crawl space climate, but a dehumidifier is in most cases the most effective and most affordable solution for you. It doesn’t kill the mold but it can prevent further growth by reducing the humidity.

Tips for Saving Money on Mold Removal

  • Act fast and don’t consider whether or not to remove mold;
  • A small mold infestation is manageable;
  • Large mold colonies can be devastating both financially and healthwise;
  • Once your mold is removed, schedule regular cleaning to prevent new mold spores from settling in again;
  • Mold remediation professional service can save you money in the long run;
Benjamin McInerny
Author: Benjamin McInerny - is a qualified arborist with 20 years of industry experience. Ben has a wide knowledge of renovation and DIY projects around the house such as lawns, fencing and painting. Ben shares his skills with DIY and gardening enthusiasts.