How many insulation & weatherization contractors are in DIAMOND BAR, CA?

3 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.

Insulation & Weatherization contractors in DIAMOND BAR, CA

3 listings

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

There are 3 insulation & weatherization contractors in DIAMOND BAR, California with a current state license as of 2026-08-31. The earliest license expiry among them is 2027-01-31; 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
ALL ABOUT T-BAR	570421	C-2	2027-06-30	DIAMOND BAR	91765	Set up workspace
HAMMOND DRYWALL CONSTRUCTION	956694	C-2, C-9	2027-01-31	DIAMOND BAR	91765	Set up workspace
LIGHT CONTRACTING	1122793	C-2	2028-06-30	DIAMOND BAR	91765	Set up workspace

Quick answers

How many insulation & weatherization contractors are in DIAMOND BAR?: 3 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.