PLONOWSKI ARCHITECTS + BUILDERS
License
- Status
- CLEAR
- First issued
- July 14, 1992
- Expires
- July 31, 2028
- Entity
- Sole Owner
- Address of record
- 23 DORSET LANE, Mill Valley, CA 94941
- Phone of record
- (415) 389 8047
Contractor bond
- Surety
- BUSINESS ALLIANCE INSURANCE COMPANY
- Bond number
- G141223297765
- Amount
- $25,000
- Effective
- February 4, 2025
Workers’ compensation
- Carrier
- NATIONAL CASUALTY COMPANY
- Policy number
- 8035997164
- Effective
- August 25, 2026
- Expires
- August 25, 2027
Are they licensed for your job?
A California contractor may only contract for work their classification covers. Pick the job and this reads the license on file against it.
Licensed to perform
A contractor may only contract for work within their classifications. See all 141 licensed general building contractors in Mill Valley.
People on this license
| Name | Title | Since | Through |
|---|---|---|---|
| PLONOWSKI THADDEUS JEFFREY | Sole Owner | July 14, 1992 | Current |
| PLONOWSKI THADDEUS JEFFREY | Sole Owner | June 16, 2000 | January 1, 2004 |
Verified status badge
Put this on your website or in a bid packet. It reads the state’s record live every time someone loads it, so it is never a screenshot of a good day. Free, and you don’t need to claim this listing to use it.
<a href="https://bookofbuilders.com/license/649916" target="_blank" rel="noopener">
<img src="https://bookofbuilders.com/badge/649916.svg" alt="PLONOWSKI ARCHITECTS + BUILDERS — California contractor license #649916 status, verified against CSLB records" width="268" height="76">
</a>The badge shows whatever the CSLB record says — including a suspension or lapsed coverage. There is no paid version and no way to change what it displays. That is what makes it worth showing. The same data as JSON if you’d rather build your own.
Is this your license?
Claim this page to add your photos, description, service area and contact details. The state’s record above stays exactly as it is — claiming adds to a page, it never edits or hides anything the CSLB reports.
Source: California Contractors State License Board public records. Coverage lapse is evaluated against today’s date; all other fields reflect the latest weekly CSLB file. Confirm at the CSLB’s official record before signing a contract.