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.
These aren't badges we bought — they're earned credentials that hold us to manufacturer, federal, and state standards.
CertainTeed ShingleMaster is an installer credential. Review the eligibility and registration requirements for the warranty on your selected system.
Firm #NAT-F310484-1. Certified to safely contain and manage lead-based paint on older homes, keeping your family protected during the work.
Contractor license #MASSMML832MJ — registered and in good standing with Washington State L&I, and verifiable by anyone, any time.
Full Washington State bonding and liability coverage, so you're protected from the first nail to the final cleanup — no gaps, no excuses.
A roofing project shouldn't put your home or your finances at risk. We carry comprehensive coverage on every job.
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.
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.
Hiring a certified, licensed contractor isn't just paperwork — it directly affects your warranty, your safety, and your recourse.
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.
Homes built before 1978 can contain lead paint. Our EPA Lead-Safe certification means disturbed paint is handled to federal RRP safety standards.
A verifiable state license and bond mean you have genuine recourse — and a contractor held to Washington standards, not just a handshake.
Our credentials are backed by years of 5-star work across Seattle and the Eastside — paperwork and performance, together.
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 license number is MASSMML832MJ. You can confirm it's active and in good standing using the Washington State Department of Labor & Industries "Verify a Contractor" tool at lni.wa.gov — just search the license number or "Mass & Mass LLC."
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.
Work with a certified, licensed, and insured roofing team. We'll call you within 1 business day.
Get a free, no-obligation estimate from a fully certified, licensed, and insured Seattle roofing team.