Certified & Credentialed Roofing in Seattle & King County
When you hire Mass & Mass, you're hiring a fully licensed, bonded, and insured contractor — backed by manufacturer and EPA certifications. Here's the proof behind every roof we install.
The Certifications Behind Every Roof
These aren't badges we bought — they're earned credentials that hold us to manufacturer, federal, and state standards.
CertainTeed ShingleMaster™
CertainTeed ShingleMaster is an installer credential. Review the eligibility and registration requirements for the warranty on your selected system.
EPA Lead-Safe Certified Firm
Firm #NAT-F310484-1. Certified to safely contain and manage lead-based paint on older homes, keeping your family protected during the work.
Washington State Licensed
Washington contractor registration #MASSMML832MJ. Search this number or Mass & Mass LLC in Washington L&I Verify to review the current registration, bond and insurance information.
Licensed, Bonded & Insured
Full Washington State bonding and liability coverage, so you're protected from the first nail to the final cleanup — no gaps, no excuses.
Fully Insured — $2 Million in Coverage
A roofing project shouldn't put your home or your finances at risk. We carry comprehensive coverage on every job.
Protected on Every Project
Mass & Mass carries $2,000,000 in total liability coverage so that, in the rare event something goes wrong, you and your property are protected — not left holding the bill.
- $1,000,000 commercial general liability — per occurrence
- $1,000,000 general aggregate
- $1,000,000 commercial umbrella policy
- $2,000,000 in total liability coverage
- Washington State contractor bond
- Licensed, bonded & insured in Washington State
Coverage figures reflect Mass & Mass LLC's commercial general liability and umbrella policies plus our Washington State contractor bond. Certificates of insurance are available on request before your project begins.
Why Credentials Matter for Homeowners
Hiring a certified, licensed contractor isn't just paperwork — it directly affects your warranty, your safety, and your recourse.
Warranty Eligibility
Warranty eligibility and coverage depend on the selected system and written project terms. Review material and workmanship coverage, exclusions, registration requirements, and any additional cost before approving the work.
Lead-Safe on Older Homes
Homes built before 1978 can contain lead paint. Our EPA Lead-Safe certification means disturbed paint is handled to federal RRP safety standards.
Real Accountability
A verifiable state license and bond mean you have genuine recourse — and a contractor held to Washington standards, not just a handshake.
Proven Since 2016
Our credentials are backed by years of 5-star work across Seattle and the Eastside — paperwork and performance, together.
Certifications & Credentials FAQ
Everything you need to know about the licenses, certifications, and insurance behind our work.
Mass & Mass holds the CertainTeed ShingleMaster installer credential. Warranty eligibility and coverage depend on the selected system and written project terms. Review material and workmanship coverage, exclusions, registration requirements, and any additional cost before approving the work.
The EPA requires firms working on homes built before 1978 to be Lead-Safe certified so any lead-based paint is handled without putting your family at risk. Mass & Mass is EPA Lead-Safe Certified Firm #NAT-F310484-1 and follows the federal Renovation, Repair, and Painting (RRP) rule.
Our registration number is MASSMML832MJ. Search the number or Mass & Mass LLC using Washington L&I Verify to review current registration information. L&I also explains what homeowners can check in the tool.
Yes — we carry $2,000,000 in total liability coverage: $1,000,000 in commercial general liability (per occurrence and general aggregate) plus a $1,000,000 commercial umbrella, along with our Washington State contractor bond. You're protected throughout your project, and a certificate of insurance is available on request.
Request a Free Estimate
Tell us what you need. We’ll review your request and contact you to arrange the next step.
Roofing You Can Trust — Backed by Proof
Get a free, no-obligation estimate from a fully certified, licensed, and insured Seattle roofing team.