- License number
- 939370
- Licensed for
- Plumbing
- First issued
- 2009
- Valid through
- Mar 2027
- Bond
- Bonded $25,000
- Source checked
- Jul 28, 2026
Public evidence profile · Checked May 2026
James Cooper Plumbing
Credentials & registries
California Contractors State License Board
No Trust Score yet
- Rated 4.7 from 34 reviews
- 1 credential shown
Based on rating, review volume, independent sources and credential evidence. Evidence context, not a guarantee of workmanship.
Reviews · public evidence
What customers say
These review totals are published independently on the named public source below, not testimonials this business chose to show. We show the aggregate rating, review volume, and source attribution we hold so you can weigh the evidence yourself.
4.7out of 5
Where these reviews are published
- Porch34 reviews · 4.7 avg
Credentials and associations
1Credentials and memberships
These credentials and memberships are attributed to named public sources. Check the source before relying on them.
Sources
2 named public sourcesWhere this information comes from
Everything on this page is drawn from named public sources. Where a source provides a public link, you can open the original and dig deeper.
Review sources
Registers and membership directories
Public evidence last checked May 2026
About
Full service plumbing company
Your own checks
What to check before you hire
Worth checking yourself
Always confirm credentials and quotes with the business directly before hiring.
Agree the callout fee, the hourly or fixed rate, and whether parts are charged on top, in writing, before an emergency plumber starts. Out-of-hours overcharging and 'while I'm here' add-ons are common complaints.
Be wary of a plumber who, on a first visit, says your whole system or boiler must be replaced. Get a second opinion and an itemized quote (parts and labor separately) before agreeing to major work.
Gas work is licensed separately from general plumbing in most states. Make sure anyone working on a gas appliance or gas line is licensed for gas work under your state's rules, and ask for proof of that license before they start.
Want an extra legitimacy check? Run the Rogue Contractor Check on James Cooper Plumbing before you contact them.
Run Rogue Contractor Check →Good to know
Common questions about James Cooper Plumbing
Is James Cooper Plumbing a legitimate business?
James Cooper Plumbing has 34 independent public reviews, rated 4.7 out of 5. This is independent public evidence gathered from named public sources (no ads, no paid placement), not a guarantee of workmanship. If anything here is out of date, the business can request a correction.
What do customers say about James Cooper Plumbing?
James Cooper Plumbing has 34 public reviews, averaging 4.7 out of 5. The reviews section shows the aggregate rating, review volume, and review source information we hold.
How do I know James Cooper Plumbing's reviews are genuine?
James Cooper Plumbing's 34 public reviews come from a named public review source. MyTrustedTraders brings this public evidence together with no ads and no paid placement: we show the review source information and aggregate rating we hold rather than selling rankings, so you can weigh the evidence for yourself.
Is James Cooper Plumbing qualified and accredited?
We hold 1 independently sourced credential for James Cooper Plumbing, including California Contractors State License Board. Each is attributed to the body that issued it in the credentials section. For example, California Contractors State License Board is California's Contractors State License Board: the state body you must be licensed with to do contracting work in California.
