Do you offer free consultations or second opinions?

Yes. Louis has reviewed reports and answered questions for prospective clients without charging, and has called back same-day with professional opinions on other inspectors' findings.

What areas do you serve?

Charleston, Mt Pleasant, Summerville, Daniel Island, Goose Creek, James Island, and Hanahan.

Are your inspectors certified?

Their website states they employ Board Certified Indoor Environmental Consultants through the American Council For Accredited Certification.

GLS Mold Testing Charleston Mt Pleasant Summerville

Updated 2026-07-21 · 1,187 reviewed · 45 listed · Scored from 15 Google reviews · How we rank ›

4.8(15) 75 composite score See reviews on Google ✓ Google-verified

Mold Remediation

GLS Mold Testing Charleston Mt Pleasant Summerville

Service: Mold Remediation
Reviews: 15

What recent reviews say

Louis at GLS combines deep moisture and mold expertise with an unusual willingness to advise prospective customers even without immediate payment. Most reviewers praise his ability to pinpoint underlying causes and explain solutions clearly, often going beyond standard inspection scope. One family's experience stands sharply against this pattern: an inspection Louis conducted missed significant ductwork mold, leading to $40,000 in subsequent remediation and health costs; they note he did not respond to their follow-up photos.

Praised for

knowledgeable staff, especially Louis
thorough diagnostics and root-cause analysis
patient explanation in layman's terms
generous with time and advice
responsive and available

Watch-outs

incomplete inspection missed ductwork mold
no follow-up after negative finding

skilled-staffresponsive-24-7friendly-stafftransparent-pricingpunctual

Best for: homebuyers, property owners, and HVAC contractors seeking expert moisture diagnostics

Think twice if: your home has complex ductwork or hidden moisture sources; one family's experience suggests inspection scope may vary

Strengths

scientific, root-cause diagnostic approach
founder Louis known for deep expertise and accessibility
willing to advise even without immediate billing
explains findings in clear, non-technical language

Worth knowing

Founder Louis Schweers known by name across reviews dating back 9 years
willing to provide free consultation and second opinions on other inspectors' reports
has served construction company clients for 13+ years with no mold recurrence
construction and HVAC industry background cited by reviewers

What reviews say by service

Mold Remediation: Praised for diagnosing root causes and explaining solutions; one case where inspection missed ductwork mold
water-extraction-drying: Moisture analysis and humidity control guidance regularly mentioned as strong suit

How it compares

Rated 4.8 against a 4.9 average across the 40 mold remediation businesses listed here.
Has more Google reviews than 43% of the businesses in this directory.

How we scored this

Scoring Method

Star rating 90

Review volume 52

Review recency 89

Review sentiment 70

Profile completeness 75

Verification 30

Rating breakdown

Contact

Phone: +1843-881-4803
Website: https://www.glsengineering.com/

Last verified 2026-07-21

Opening hours

Monday: 09:00-16:00
Tuesday: 09:00-16:00
Wednesday: 09:00-16:00
Thursday: 09:00-16:00
Friday: 09:00-16:00
Saturday: Closed
Sunday: Closed

As listed on Google.

From their website

Services listed

Mold Testing & InvestigationMoisture AnalysisAir Quality SolutionsHumidity ControlOdor InvestigationsCrawl Space Moisture InspectionCupping Floors InvestigationAttic Moisture Investigation

Credentials claimed:Board Certified by the American Council For Accredited Certification as a Council-Certified Indoor Environmental Consultant

Operating:since 2003

As published by the business on its own website; not independently verified.

Common questions

Do you offer free consultations or second opinions?: Yes. Louis has reviewed reports and answered questions for prospective clients without charging, and has called back same-day with professional opinions on other inspectors' findings.
What areas do you serve?: Charleston, Mt Pleasant, Summerville, Daniel Island, Goose Creek, James Island, and Hanahan.
Are your inspectors certified?: Their website states they employ Board Certified Indoor Environmental Consultants through the American Council For Accredited Certification.