How many plumbing contractors are in DIAMOND BAR, CA?

24 with a current California license, as of 2026-08-31.

How do I check a California contractor license is current?

Every listing shows its state license number and expiry date. Verify any of them directly against the California CSLB licensee database.

Plumbing contractors in DIAMOND BAR, CA

24 listings

Source: California CSLB license records. Last verified 2026-08-31.

There are 24 plumbing contractors in DIAMOND BAR, California with a current state license as of 2026-08-31. The earliest license expiry among them is 2026-10-31; every listing shows its own number and expiry date. All are drawn from the California CSLB register; expired and inactive licenses are excluded.

Business	License	Type	Expires	City	Zip
ACE PLUMBING CO	785570	B, C-36	2026-10-31	DIAMOND BAR	91765	Set up workspace
ADVANCED TANKLESS AND PLUMBING	1121827	C-36	2028-06-30	DIAMOND BAR	91765	Set up workspace
A E D CONTRACTORS	441036	A, B, C-10, C-36	2028-03-31	DIAMOND BAR	91765	Set up workspace
ALL DAY DRAINS	1088634	C-36	2028-03-31	DIAMOND BAR	91765	Set up workspace
AVEO INC	969881	A, B, C-10, C-20, C-36	2028-02-29	DIAMOND BAR	91765	Set up workspace
CANY FIRE PROTECTION INC	1142986	C-16, C-36	2027-09-30	DIAMOND BAR	91765	Set up workspace
C S D M INC DBA CAL STEAM COMPANY	674646	C-4, C-20, C-36	2027-04-30	DIAMOND BAR	91765	Set up workspace
C - THIRTY - SIX INC	739644	B, C-36	2028-05-31	DIAMOND BAR	91765	Set up workspace
ELITE PIPE P	1144688	C-36	2027-10-31	DIAMOND BAR	91765	Set up workspace
EXPEDITE PLUMBING	939646	C-36	2027-10-31	DIAMOND BAR	91765	Set up workspace
GALVAN PLUMBING	1065435	C-36	2028-04-30	DIAMOND BAR	91765	Set up workspace
G C PLUMBING	681446	C-36	2027-12-31	DIAMOND BAR	91765	Set up workspace
HSUEH YU LIAO	769733	B, C-10, C-36	2027-10-31	DIAMOND BAR	91765	Set up workspace
JAY'S PLUMBING	622850	C-36	2027-07-31	DIAMOND BAR	91765	Set up workspace
JH BUILDER AND REMODELING INC	751479	B, C-16, C-36	2027-06-30	DIAMOND BAR	91765	Set up workspace
J H PLUMBING	876263	C-36	2028-04-30	DIAMOND BAR	91765	Set up workspace
JONES PLUMBING	917266	C-36	2028-06-30	DIAMOND BAR	91765	Set up workspace
KENNETH DALEY HEATING & AIR SERVICES	798187	C-20, C-36	2027-08-31	DIAMOND BAR	91765	Set up workspace
MING CHU CHEN CHIEN	820540	B, C-10, C-36	2027-06-30	DIAMOND BAR	91789	Set up workspace
MIRAE CONSTRUCTION CO	876472	A, B, C-36	2028-05-31	DIAMOND BAR	91789	Set up workspace
MONAIR CONTRACTORS	677543	B, C-10, C-36	2027-03-31	DIAMOND BAR	91765	Set up workspace
SERVICE WIZARDS	797071	C-20, C-36, C-42	2027-07-31	DIAMOND BAR	91765	Set up workspace
TODD CLARK DBA ROOTER SHOOTER	800418	B, C-36, C-42	2027-10-31	DIAMOND BAR	91765	Set up workspace
ZIP RENOVATION & AIR	762505	B, C-10, C-15, C-20, C-36	2027-05-31	DIAMOND BAR	91765	Set up workspace

Quick answers

How many plumbing contractors are in DIAMOND BAR?: 24 with a current California license, as of 2026-08-31.
How do I check a license is current?: Every listing shows its state license number and expiry. Verify any of them directly against the California CSLB licensee database.