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Electrical contractorMontclair, CA

Klaus & Sons Plumbing Heating & Air Conditioning

Licensed since 1976 · Corporation · 5 building permits on record

CSLB #320990 · ActiveWorkers' comp insuredBonded $25,000Verified website
License classes
C-10 ElectricalC-16 Fire ProtectionC-20 HVACC-36 Plumbing
5
Permits on record
2 jurisdictions
1
Permits in 3 years
last May 22, 2024

Work history

Building permits: City of Los Angeles, City of Anaheim

Permits by year

4201912024
Data covers City of Los Angeles 2006–Oct 2026; City of Anaheim 1999–Sep 2026.

What they build

HVAC
3
Electrical
2

Most recent permits

IssuedWorkJurisdictionZIP
May 22, 2024HVACCity of Anaheim—
Oct 8, 2019ElectricalCity of Los Angeles90039
Oct 8, 2019HVACCity of Los Angeles90039
Sep 17, 2019ElectricalCity of Los Angeles90039
Sep 17, 2019HVACCity of Los Angeles90039
Only the type of work, date and ZIP are shown — never homeowner names or street addresses.
Permits are matched to this contractor by CSLB license number on the permit

Where they work

Building permits

Jurisdictions

Los Angeles
4
Anaheim
1

Top ZIP codes

  • ZIP 900394
Area is where permits were issued, not the office address

License, bond & insurance

California Contractors State License Board
  • CSLB license#320990 · Active
  • Business typeCorporation
  • Issued · expiresJun 25, 1976 · Jul 31, 2028
  • OfficeMontclair, CA 91763
  • CSLB record updatedJun 19, 2026
  • Contractor bond$25,000 · since Jan 1, 2023
  • Bond companyAmerican Contractors Indemnity Company
  • Workers' compensationWorkers' Compensation Insurance · until Dec 1, 2026
  • InsurerPreferred Employers Insurance Company

License classes

C-10 ElectricalC-16 Fire ProtectionC-20 HVACC-36 Plumbing
Always confirm a license on cslb.ca.gov before signingCheck another license

About the company

klausandsons.com

Services

CommercialFinancingHVAC
  • Founded1973
  • Websiteklausandsons.com
From the company's own website, checked Oct 8, 2026. Claims are the company's; we show where each came from.
Facts with links to the page they came from

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Questions & answers

Is Klaus & Sons Plumbing Heating & Air Conditioning licensed?
CSLB license #320990 is active, issued Jun 25, 1976 and valid through Jul 31, 2028, with classes C-10, C-16, C-20, C-36.
Is Klaus & Sons Plumbing Heating & Air Conditioning insured and bonded?
CSLB lists workers' compensation insurance with Preferred Employers Insurance Company until Dec 1, 2026 and a $25,000 contractor bond with American Contractors Indemnity Company.
How many jobs has Klaus & Sons Plumbing Heating & Air Conditioning done?
Building permits name the company on 5 jobs, including 3 hvac, 2 electrical.
Where does Klaus & Sons Plumbing Heating & Air Conditioning work?
Most permits are in City of Los Angeles, City of Anaheim.

Sources

  1. Contractors State License Board — license, bond and workers' comp records (Jun 19, 2026).
  2. Building permits — City of Los Angeles, City of Anaheim.
  3. Company website — klausandsons.com (checked Oct 8, 2026).
Answers use only the facts on this pageIs this your business? Update listing