How much should I charge per square foot for mold remediation?

For straightforward Condition 3 work, roughly $12 to $25 per square foot is a defensible range, climbing to $30+ with heavy demolition or difficult access. But treat that as a sanity check, not a quoting method. Build the number from line items (containment, HEPA AFDs, demolition, antimicrobial, labor, equipment runtime, clearance) and divide back into square footage. A flat per-square-foot quote given before you have moisture and condition-class data is how contractors lose money on clearance failures.

What is condition class and why does it matter for pricing?

Condition class comes from the IICRC S520 standard. Condition 1 is normal fungal ecology (no remediation needed), Condition 2 is settled spores with no active growth (lighter cleaning and air scrubbing), and Condition 3 is active growth requiring full containment, demolition of porous materials, and post-remediation verification. Two jobs of identical square footage can differ by 3x in cost based on class, so you should scope and price each area by its own condition class, room by room.

How do I size HEPA air scrubbers so I do not fail clearance?

Size to at least 4 air changes per hour (ACH) in the contained volume. Calculate cubic feet (length x width x ceiling height), multiply by 4, and divide by 60 to get required CFM. For a 2,000 sq ft basement with 8-foot ceilings, that is 16,000 cubic feet, needing about 1,067 CFM, or two 500-CFM scrubbers minimum. Undersized filtration is one of the most common reasons post-remediation verification fails.

Should I include third-party clearance testing in my quote?

Yes, as an explicit line item. Whether you self-verify with a documented post-remediation verification (PRV) or budget for a third-party industrial hygienist, clearance is a real cost and a real risk. Build it into the estimate so a failed test does not come out of your margin, and keep daily moisture, RH, and negative-pressure records so you can prove the work was done to standard before you called for clearance.

What documentation protects me if a customer disputes the invoice?

Daily moisture-meter and relative-humidity logs by room, containment and negative-pressure verification, equipment-runtime records, a documented PRV, and the third-party clearance result. When these all trace back to the same job file, a customer or insurer challenge is answered with readings instead of arguments. A workbook that ties your scope, daily readings, and clearance log together is the difference between winning and losing a dispute.

How to Price Mold Remediation Jobs (IICRC S520 Guide)

# How to Price Mold Remediation Jobs Without Losing Money on Clearance

Most mold remediation contractors do not lose money because their labor rate is too low. They lose it because they scoped the job on a walk-through, quoted a flat number, and then discovered condition class 3 growth behind the drywall on day two. By then the price is set, the customer expects that number, and the extra containment, HEPA-AFDs, and technician hours come out of your margin.

Pricing a remediation job well means pricing the *scope you can actually defend* against an IICRC S520 clearance, not the scope you hope to get away with. This guide walks through how experienced remediators build a number that survives both the customer's scrutiny and a third-party clearance test.

Start with condition class, not square footage

Square footage alone is a trap. Two 400 sq ft jobs can differ by a factor of three in cost depending on condition class. The IICRC S520 standard is the reference document here, and even though it does not dictate pricing, it dictates the *work*, which is what you are pricing.

Think in terms of the three practical scoping tiers you actually bill:

Condition 1 (normal fungal ecology): you are not remediating. Do not scope work here. If the customer wants a "cleaning," that is a different, cheaper service line.
Condition 2 (settled spores, no active growth): HEPA vacuuming, damp wiping, and air scrubbing. Lighter containment. This is your lower-cost tier.
Condition 3 (actual active growth): full containment, controlled demolition of porous materials, antimicrobial application, and post-remediation verification. This is where the real money and the real risk live.

The first thing your estimate should establish is which class you are in, room by room. A basement might be Condition 3 at the sill plate and Condition 2 six feet up the wall. Price each area on its own class.

Build the number from line items, not a per-square-foot guess

Contractors love a per-square-foot shortcut because customers ask for one. But the honest range is wide: roughly $12 to $25 per square foot for straightforward Condition 3 work, climbing to $30+ when you factor in demolition, hazardous conditions, or hard access. Quote a flat $15/sq ft and you will be right sometimes and badly wrong often.

Build from these cost drivers instead:

1. Affected square footage by class. This sets your labor hours and antimicrobial volume. 2. Containment. 6-mil poly, zipper doors, and negative-pressure setup. A single-room containment might run $300 to $700 in materials and setup labor; a multi-room chase is far more. 3. HEPA air filtration device (AFD) sizing. Size to achieve at least 4 air changes per hour in the contained volume. A 2,000 sq ft basement at 8-foot ceilings is 16,000 cubic feet; at 4 ACH you need roughly 1,067 CFM of filtration, so two 500-CFM scrubbers minimum. Undersize this and you fail clearance. 4. Demolition and disposal. Porous materials (drywall, insulation, carpet) that show active growth come out. Bag, haul, dump fees. 5. Antimicrobial and encapsulant. Priced by coverage rate per gallon against affected area. 6. Technician hours. Your loaded labor rate times realistic crew-days, including PPE donning, decon, and daily documentation. 7. Equipment runtime. AFDs and dehumidifiers run 24/7 through the job. That is a rental or depreciation cost you should be capturing. 8. Post-remediation verification (PRV) and clearance. Whether you self-verify or budget a third-party industrial hygienist, this is a line item, not an afterthought.

When you total these and divide back into square footage, you get a defensible per-square-foot figure to *show* the customer. But you built it from reality.

Price the clearance risk explicitly

Here is the mistake that ends careers: treating post-remediation verification as a formality. If a third-party clearance test fails, you are back in the containment redoing work at your own cost, and the customer's confidence is gone.

Protect the number by building in the conditions that pass clearance:

Adequate AFD sizing (the ACH math above).
Daily moisture-meter readings and relative-humidity logs by room, so you can prove the substrate dried below your threshold before you demobilized.
Negative-pressure verification and equipment-runtime records.
A documented PRV before you call for third-party clearance.

The Mold Remediation Project Kit exists precisely because this documentation is where scope disputes get won or lost. A condition-class scoping estimator, daily moisture and RH logs, a containment and equipment-runtime tracker, and a PRV/clearance log in one workbook mean your price and your proof match. When a customer or their insurer challenges the invoice, you produce the readings, not a story.

Common pricing mistakes

Quoting before you have moisture data. Mold is a symptom; moisture is the disease. If you have not found and priced the moisture source, you are pricing a job that will re-grow. Include the drying and the source callout, or scope it as a separate contractor's responsibility in writing.

Forgetting equipment runtime. AFDs and dehumidifiers running 72 to 120 hours are a real cost. Contractors who only bill "setup" and "teardown" leave money on the table every job.

Under-scoping containment to win the bid. The cheapest containment is the one you have to rebuild after cross-contamination. Do not shave poly and zipper doors to hit a competitor's number.

Ignoring certification and CEC overhead. Your IICRC certification and continuing education credits (CECs) are a cost of staying in business. Build a small overhead load into every job so renewals are funded.

No change-order process. When you open a wall and find Condition 3 where you scoped Condition 2, you need a signed change order on the spot. Verbal "I'll add it to the bill" agreements are how you eat the difference.

A realistic estimate walk-through

A 500 sq ft finished basement, Condition 3 along two walls (about 180 sq ft of active growth), water source from a failed sump. Rough build:

Containment and negative pressure: $600
Two 500-CFM HEPA AFDs, 4-day runtime + one dehumidifier: $700
Controlled demolition of affected drywall and insulation, disposal: $900
Antimicrobial and encapsulant: $350
Technician hours (2 techs x 3.5 days loaded): $3,200
PRV and third-party clearance budget: $450
Overhead and margin load: apply your business percentage

That is roughly $6,200 in direct cost before margin, or about $12.40/sq ft on the full footprint before you add profit. Add your target margin and you have a number that survives clearance instead of one that wins the bid and loses the job.

Turn your estimate into an operations system

The estimate is step one. The jobs that stay profitable are the ones where the scope, the daily readings, and the clearance documentation all trace back to the same workbook. If you are building your pricing process from scratch, the free ServiceOpsKits guide walks through the condition-class scoping logic and the clearance-documentation habit that keeps remediators out of disputes. Pair that with a repeatable line-item estimator and you stop quoting from memory and start quoting from a system.

Price the work you can defend, document the readings that prove it, and let the clearance test be a formality because you engineered it to pass.