Real Estate Due Diligence

Real estate IAQ assessments: answers before you close

A licensed home inspection gives you a broad review of the home's structure and major systems. An ESG indoor air quality assessment adds a complementary layer of due diligence: mold, moisture intrusion, odors, and air quality conditions a general inspection is not designed to evaluate. Schedule early. Due diligence windows close fast.

Schedule Your IAQ Assessment Call 336-373-1538

Independent Testing No Conflict of Interest Council-certified staff IICRC-Referenced Standards

Bright residential living room of a home under purchase contract

Beyond the home inspection

A home can look fine and still have air quality concerns

A home inspection is an essential step, and it is not designed to evaluate indoor air. Mold growth behind walls, moisture intrusion under floors, and chemical off-gassing from materials are often invisible to a visual walkthrough. Lab-analyzed sampling helps determine whether suspect microbial growth is actually mold, rather than assuming based on appearance alone.

Modern kitchen that appears clean while hidden air quality conditions go untested

Home inspection scope

Built to evaluate the structure, not the air

A licensed home inspection reviews the home's structure and major systems, and it is a vital part of due diligence. Indoor air quality evaluation, mold sampling, moisture mapping, and odor source investigation are simply outside the scope of most standard inspections.

ESG air quality meter running inside a residential room during an assessment

After ESG IAQ Assessment

Documented findings before your due diligence closes

ESG uses advanced equipment to evaluate mold, moisture, odors, and air quality red flags that direct next steps. You receive a written report a few business days after payment, giving you time to review findings, line up contractor quotes, and make an informed decision before your due diligence deadline.

What's included

A science-based IAQ assessment built for real estate decisions

ESG's real estate IAQ assessment evaluates conditions connected to health concerns, odors, mold, and moisture intrusion, identifying potential hidden problems that may be affecting the air quality of the home you're considering purchasing. Findings apply to the accessible areas, conditions, locations, measurements, and samples evaluated at the time of service. They do not establish conditions throughout the building or guarantee future conditions.

Mold and microbial growth assessment: lab-analyzed sampling helps determine whether suspect microbial growth is actually mold, rather than assuming based on appearance alone

Moisture intrusion evaluation: advanced equipment identifies moisture conditions that are often invisible to visual inspection but create conditions for mold growth and structural damage

Odor evaluation: ESG uses advanced equipment to identify air quality "red flags" that help direct recommendations and next steps, rather than guessing by smell alone. Combined with building history and field observations, that data may help narrow potential sources

Remediation contractor guidance: ESG maintains a referral list based on non-biased, industry-standard qualifications and can help you understand what standards a remediation contractor should meet (IICRC-certified, following ANSI/IICRC S520)

Due diligence timeline guidance: ESG advises on how to protect your decision window, including when to seek contractor quotes and whether to request a due diligence extension if issues are discovered

Written report delivered about 1 week after payment: clear findings and recommendations suitable for sharing with your real estate agent, attorney, or remediation contractors when requesting quotes

Moisture meter pressed against a residential wall to detect hidden moisture

Technician swabbing suspect microbial growth on a wall for lab analysis

Open case of calibrated air sampling equipment used during assessments

Printed ESG report pages showing moisture readings and findings

Why ESG

We test. We never remediate. That separation helps reduce financial conflicts.

ESG is an independent third-party testing and consulting company and does not perform remediation. This separation helps reduce financial conflicts between evaluation and corrective work. We don't refer contractors for a fee, we don't perform cleanup work, and we don't profit from the size of the problem we find. Our only product is independent, documented information.

This independence matters in real estate. When a testing provider also sells or refers remediation for a fee, financial incentives can creep into what gets found. ESG maintains a referral list based strictly on non-biased, industry-standard qualifications so that if you need contractor guidance, it's grounded in professional standards like the ANSI/IICRC S520, not referral economics.

ESG recommends calling as soon as your purchase contract is signed. The earlier you schedule, the more time you have to review findings, get contractor quotes, and make confident decisions before your due diligence window closes.

Schedule Your Assessment

~1 wk

Written report delivered after payment

S520

ANSI/IICRC mold remediation standard we reference

Remediation services sold or performed by ESG

Certified

Council-certified IAQ professionals on staff

Our process

Schedule the day your contract is signed

Due diligence windows are short. ESG's process is designed to give you maximum time to review findings, consult contractors if needed, and make an informed decision before deadlines close.

ESG consultant reviewing paperwork with a client at a table

Schedule immediately

Call ESG as soon as your purchase contract is signed. This maximizes the time available for assessment, reporting, and, if issues are found, contractor estimates, all within your due diligence window.

Technician using an infrared thermometer to check surface conditions in a home

On-site assessment

ESG visits the property with advanced equipment to evaluate mold, moisture intrusion, odors, and air quality conditions. The home should be undisturbed before testing: avoid cooking, smoking, cleaning, open windows, or walkthroughs during the assessment.

Labeled surface sample collected for laboratory analysis

Lab analysis & written report

Samples are submitted for laboratory analysis. ESG delivers a written report a few business days after payment, detailing findings, air quality red flags, and professional recommendations for next steps.

ESG technicians assessing indoor air quality at a building window wall

Clear report, confident decision

Use ESG's findings to negotiate repairs, request contractor estimates, or make an informed decision to proceed or walk away. If widespread issues are found, ESG advises obtaining all quotes before due diligence ends, or requesting an extension.

IAQ assessment vs. home inspection

Two different tools for two different jobs

ESG IAQ assessment

Focuses on conditions that may relate to health, odors, mold, and moisture, using data-driven methods that document indoor air quality at the time of service and can identify issues that may not be visible to the eye.

Lab-analyzed sampling to help determine whether suspect growth is mold
Advanced equipment helps locate hidden moisture and narrow potential odor sources
No conflict of interest: ESG never performs remediation
Report detail contractors can use when preparing quotes

A home inspection alone

Reviews the home's structure, major systems, and visible conditions. It is an essential step in due diligence, and health-related conditions, especially mold, moisture, and air quality, are generally outside its scope.

Confirming whether visible growth is mold typically requires laboratory analysis
Hidden moisture intrusion often missed without advanced equipment
Air quality parameters and odor sources are outside the standard scope
Laboratory sampling is typically not part of the scope

Why home buyers choose ESG

Independent, accountable, and staffed by certified professionals

ESG has provided independent environmental testing from Greensboro, NC since 2002. Every real estate assessment is built on the same standards.

Independent since 2002: 23+ years of environmental testing experience

We test, we never remediate, which helps reduce financial conflicts between evaluation and corrective work

Technical reports receive review appropriate to the service and scope before delivery

ESG's team includes a Council-certified Indoor Environmental Consultant (CIEC), a Council-certified Indoor Air Quality Manager (CIAQM), Council-certified Residential Indoor Environmentalists (CRIEs), and staff certified in BPI Infiltration and Duct Leakage testing

BBB A+ rated and family-owned, based in Greensboro, NC

Serving home buyers across NC, VA and TN

Common questions

Frequently asked questions

Do I need an IAQ assessment if I already have a home inspection?

Yes. They serve different purposes. A licensed home inspection provides a broad review of the home's structure and major systems. An IAQ assessment adds a focused evaluation of odors, mold, and moisture using field instruments and laboratory analysis. Lab-analyzed sampling helps determine whether suspect microbial growth is actually mold, rather than judging by appearance alone.

When should I call ESG during the home buying process?

Call immediately after your purchase contract is signed. This gives ESG more time to assess the property and prepare your findings, and gives you more time to review recommendations and, if needed, line up qualified contractors for quotes before your due diligence deadline closes.

How should the home be prepared before testing?

To avoid inaccurate readings, the home should have minimal disturbance before testing. Avoid high activity and movement in the home, cooking, smoking, showering, cleaning, laundry, open windows or doors, spraying airborne products like hairspray, and conducting walkthroughs or other inspections during the test period.

What if the home inspector found visible suspect microbial growth?

Start researching certified remediation contractors right away and plan for quotes to take time, since it can take weeks to schedule and receive estimates. Contractors can provide more accurate pricing after reviewing ESG's full written report. You may also need multiple specialists: remediation contractors, HVAC consultants, waterproofing professionals, or structural engineers.

Can ESG tell me how much remediation will cost?

No. ESG provides independent testing and assessment only. We do not perform remediation work and cannot provide cost estimates; that requires a quote from a licensed remediation contractor. ESG's written report gives contractors detail they can use when preparing pricing.

What mold remediation standard should contractors follow?

ESG recommends using remediators certified by the IICRC and following the ANSI/IICRC S520 Standard and Reference Guide for Professional Mold Remediation, the industry-recognized standard for professional mold remediation. ESG maintains a referral list based on these non-biased, industry-standard qualifications. Contractor information is provided as a convenience. ESG does not guarantee, supervise, or accept responsibility for a contractor's pricing, schedule, workmanship, licensing status, or performance. The client selects and contracts with the contractor independently.

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