Bath Contractor CheckLook up a bathroom contractor's license before you sign anything

Diamond Bar bathroom contractor license lookup

Before you sign anything in Diamond Bar, CA, search the 7 bathroom contractors we have on file for it. Every result links back to the state's own record.

Licenses checked · California Contractors State License Board

14median years licensed

What Diamond Bar's license record shows

The oldest license among Diamond Bar's bathroom contractors dates to 1998.

Diamond Bar's median time licensed is 14 years.

57% have held a license for a decade or longer, one data point worth weighing alongside whatever a search turns up.

Data: California Contractors State License Board license records, checked 2026-09-30.

Search bathroom contractors based in Diamond Bar, A to Z

Every bathroom contractor based in {city} with an active state license, A to Z by business name, not a ranked or paid list.

  • Big Mango Renovation INC1121648B General BuildingExpires Jun 30, 2028Verify license
  • JH Builder And Remodeling INC751479B General Building / C-36 PlumbingExpires Jun 30, 2027Verify license
  • Kitchen And Flooring Center INC968078B General Building / C-54 TileExpires Dec 31, 2027Verify license
  • Ming's Construction And Hotel Renovation973795B General BuildingExpires Jun 30, 2028Verify license
  • New Life Construction And Renovation1039347B General BuildingExpires Aug 31, 2028Verify license
  • Pjcy Renovation1095968B General BuildingExpires Aug 31, 2028Verify license
  • Zip Renovation & Air762505B General Building / C-36 PlumbingExpires May 31, 2027Verify license

How to check a license in California

  1. Open CSLB's Check a Contractor License tool.[1]
  2. Enter the license number, the business name, or a name tied to the license. Numbers here run digits only, never letters.[1]
  3. Read the license status and disciplinary history, plus the workers' compensation and insurance information on file.[2]
  4. When the contractor arrives to bid the job, ask to see their pocket license and a photo ID, and confirm the person matches it.[2]

CSLB Check a Contractor License

Warning signs

  • A bid that lands far below every other one you collected.[2]
  • No current business address on file, only a cell phone number.[2]
  • A blank or partially blank contract or change order.[3]
  • A deposit request above the legal cap without a bond to justify it.[2],[3]

Rules that protect you

  • Contractor bond of 25,000 dollars, covering every job during the life of that bond, not per project.[2]
  • Down payment capped at 10 percent of the contract price or 1,000 dollars, whichever is smaller, with a single exception for a contractor carrying a Blanket Performance and Payment Bond.[2],[3]
  • Written contract required once a job passes 500 dollars combined for labor and materials; changes must also be in writing.[3]
  • Three-day written right to cancel a signed home improvement contract.[3]

2ZIP codes with listings

Where Diamond Bar's licenses are concentrated

Across Diamond Bar's 2 covered ZIP codes, 91765 carries the largest concentration at 5 listed contractors.

Search results for Diamond Bar are not filtered by ZIP, so a name search will find a contractor from any of them.

9176591789

Data: California Contractors State License Board license records, checked 2026-09-30.

More California license lookups

All cities in California →

Sources

  1. Check a Contractor License or Home Improvement Salesperson (HIS) Registration, Contractors State License Board, accessed 2026-09-30
  2. How do I find the right licensed contractor?, Contractors State License Board, accessed 2026-09-30
  3. What Should I Look for in a Contract and Binding Agreements?, Contractors State License Board, accessed 2026-09-30