Cornerstone Inspections LLC

What They Do

Mold Testing

• 11th month warranty inspections
• Annual maintenance checkup
• Indoor allergen sampling
• Manufactured home inspections
• Mold sampling
• Multi-unit inspections
• Pre-listing inspections
• Rental property inspections
• 203k Rehab
• Foundation Certifications
• Home / Property Inspections
• Home Inspection Inspection
• Inspection Inspection
• Inspection Report
• Inspection Services
• Manufactured Home Certifications
• Manufactured Home Foundation
• Manufactured Home Foundation Certifications
• Manufactured Homes
• Property Inspections
• The Home Inspection
• The Home Inspection Process

Before You Call Cornerstone Inspections LLC

1. Do you also do remediation? If so, who checks your work?
2. How many air samples will you take, and will you take an outdoor control sample?

Ask for the company’s contractor registration number and look it up with the Washington State Department of Labor and Industries. Also ask for proof of insurance and industry certification for the technicians.

How Their Reviews Break Down

Counts from public listings as of September 23, 2026. A handful of reviews says less than a few hundred.

Read This While You Wait

• Call a proMold Testing, When It Is Worth It and How to Read a Lab ReportWhen a mold test is worth paying for, which kind to ask for, why store kits mislead, and how to read spore counts, outdoor controls and a lab report yourself.
• DIY with careAttic Mold on Roof Sheathing, Causes and FixesWhy mold grows on attic roof sheathing, how to find the cause, the fixes that stop it for good, and how to tell a cosmetic stain from a roof that needs work.