The details on Cornerstone Plumbing LLC
- WA L&I registration
- CORNEPL798NZ
- Registration checked
- September 14, 2026
- Registered since
- 2021
- Expires
- August 2027
- Contractor bond
- $6,000 · Ohio Cas Ins Co
- Liability insurance
- $1,000,000 · NATIONWIDE GENERAL INSURANCE C
- Insurance through
- July 2027
- Primary trade
- Plumbing
- L&I specialty
- JOURNEY LEVEL
- Registered principal
- PARKS, MICHAEL WESLEY · since 2021
- Service area
- Spokane Valley
Something here wrong or out of date? The business can claim this listing and correct it.
Questions worth asking Cornerstone Plumbing LLC
Is Cornerstone Plumbing LLC a registered contractor?
The number you want is CORNEPL798NZ — Cornerstone Plumbing LLC's Washington State L&I contractor registration, expiring August 2027. Last checked September 14, 2026. Washington's contractor lookup is free and open if you want to confirm it today. L&I also lists a $6,000 contractor bond (Ohio Cas Ins Co) and $1,000,000 of liability insurance with NATIONWIDE GENERAL INSURANCE C through July 2027. Get current certificates for the bond and the insurance before anyone starts.
Does Cornerstone Plumbing LLC cover my part of Spokane?
Spokane Valley. Service areas change, so confirm they cover your address when you call.
How did Cornerstone Plumbing LLC end up on this page?
Cornerstone Plumbing LLC is licensed and working in the Spokane area — that's the whole bar for a page here. The registration gets checked against the state's record and the date sits on this page, so you can judge how current it is.