Licensed Contractors in Sonoma, California

Sonoma has 357 licensed contractors registered with the California Contractors State License Board across 48 trade classifications. The most common specialties are Electrical Contractor (44), Landscaping Contractor (35), Plumbing Contractor (24). 184 contractors hold general contractor licenses (Class A or B).

All license data is sourced from the California Contractors State License Board (CSLB). Last data update: April 05, 2026.

Contractors by Trade

Building (201)
Electrical (48)
Landscaping (36)
Painting (35)
Plumbing (27)
Limited (27)
HVAC (21)
Welding (10)
Earthwork (9)
Fire (9)
Roofing (8)
Solar (3)
Napa Sonoma Builders Active
License #117102 B Sonoma, CA Est. 1950
Peterson Mechanical Inc Active
License #171486 B, C-4 +7 more Sonoma, CA Est. 1957
William Botieff Contractor Active
License #193984 B Sonoma, CA Est. 1960
Calleja Paint Co Active
License #249669 C-33 Sonoma, CA Est. 1967
E K Excavating Inc Active
License #275372 A, C-12 +1 more Sonoma, CA Est. 1972
Northern Lights Electric Active
License #295695 C-10 Sonoma, CA Est. 1974
Bill Yeo Electric Active
License #309625 C-10 Sonoma, CA Est. 1975
Robert O'Gorman General Contractor Active
License #321530 B Sonoma, CA Est. 1976
R J Lely Construction Active
License #325380 B Sonoma, CA Est. 1976
Waldron Landscaping Inc Active
License #346260 C-27 Sonoma, CA Est. 1977
D J S Steel Company Inc Active
License #348316 C-50 Sonoma, CA Est. 1977
Larbre Well Drilling And Pumps Inc Active
License #348203 C-57, D21 Sonoma, CA Est. 1977
Steve C Burlington Active
License #375816 B, C-10 Sonoma, CA Est. 1979
Dunham'S Back-Hoe Service Active
License #379304 A Sonoma, CA Est. 1979
Atelier Wellander Inc Active
License #381200 C-27 Sonoma, CA Est. 1979
Golden West Glass Co Active
License #381756 C-17 Sonoma, CA Est. 1979
Versaggi Construction Active
License #389865 A, B Sonoma, CA Est. 1980
Sculptural Gates Llc Active
License #394536 C-10, C-23 Sonoma, CA Est. 1980
Jon Ray & Sons Construction Active
License #397968 B Sonoma, CA Est. 1980
Infusion Inc Active
License #403444 C-27 Sonoma, CA Est. 1981
Ledson Construction Active
License #404946 B Sonoma, CA Est. 1981
Gerald Stanley Rupiper Active
License #416906 B Sonoma, CA Est. 1982
Ed Sammon Construction Active
License #418048 B, C-51 Sonoma, CA Est. 1982
American Builders Active
License #427930 A, B +4 more Sonoma, CA Est. 1982
Castelli Construction Active
License #428801 B Sonoma, CA Est. 1982
Voltair Electric Active
License #447266 C-10 Sonoma, CA Est. 1983
Ferrando'S Plumbing & Heating Inc Active
License #449417 C-36 Sonoma, CA Est. 1983
Scandia Landscaping Active
License #452594 C-27 Sonoma, CA Est. 1984
Abide International Inc Active
License #462833 A, B Sonoma, CA Est. 1984
Serres Corporation Active
License #471196 A Sonoma, CA Est. 1985
Bazzani Building Company Active
License #477282 B Sonoma, CA Est. 1985
Brady Construction Company Active
License #479385 B Sonoma, CA Est. 1985
Lennon Heating & Air Conditioning Inc Active
License #486309 C-20, C-43 Sonoma, CA Est. 1986
Szanyi Construction Inc Active
License #508018 B Sonoma, CA Est. 1987
Severson Heating & Cooling Active
License #508393 C-20, C-38 Sonoma, CA Est. 1987
Spiffy'S Active
License #508794 D63 Sonoma, CA Est. 1987
Nyberg Landscaping Incorporated Active
License #510617 C-27 Sonoma, CA Est. 1987
Portello Construction Active
License #518418 B Sonoma, CA Est. 1987
Phelim J Sweeney Construction Active
License #520619 B Sonoma, CA Est. 1987
Woebcke Painting Active
License #534999 C-33 Sonoma, CA Est. 1988
Arbor Fence Inc Active
License #543558 C-13, C-60 +1 more Sonoma, CA Est. 1988
Sonoma Security Lock Safe & Key Active
License #549458 D16 Sonoma, CA Est. 1988
Wudtke Built Dba Portal Construction Active
License #552858 B Sonoma, CA Est. 1989
Daniel Stephen Szumski Active
License #566657 B Sonoma, CA Est. 1989
The Sungarden Company Inc Active
License #577385 C-27 Sonoma, CA Est. 1989
Harvest Moon Active
License #581888 B Sonoma, CA Est. 1989
Demings Demolition Active
License #581967 C-21 Sonoma, CA Est. 1989
De Martini Electric Inc Active
License #584784 C-10 Sonoma, CA Est. 1990
Hoh Builders Active
License #587755 B Sonoma, CA Est. 1990
Stephen Kardum Painting Active
License #599749 C-33 Sonoma, CA Est. 1990

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Licensing Resources

How to verify a contractor license
Deposit and payment rules for California contracts
Home improvement contract requirements

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