License is active
Source: Contractors State License Board (CSLB)
Licensed
Current and in good standing
Bonded
$25,000 surety bond
Insured
Workers' comp coverage on file
Clean record
No complaints or disciplinary actions
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PLONOWSKI ARCHITECTS + BUILDERS
- License Number
- 649916
- State
- California
- Status
- active
- Business Type
- Sole Owner
- Address
- 23 DORSET LANE MILL VALLEY, CA, 94941 Marin County
- Phone
- (415) 389 8047
License Dates
Issued
07/14/1992
Expires
07/31/2026
Expires in 4 months — verify renewal before long contracts
Inactivated
08/01/2006
Reactivated
10/21/2014
CSLB Last Updated
01/13/2026
License Classifications
Personnel & Officers
PLONOWSKI THADDEUS JEFFREY
Sole Owner
Contractor Bond
Amount: $25,000
Company: BUSINESS ALLIANCE INSURANCE COMPANY
Bond #G141223297765
Effective: 02/04/2025
Workers' Compensation
Carrier: TRANSPORTATION INSURANCE COMPANY
Policy #7039131404
Effective: 12/21/2025
Expires: 12/21/2026
CSLB designation: Workers' Compensation Insurance
Complaints & Disciplinary History
This reflects CSLB's bulk license data. For detailed complaint history including pending investigations, check the official CSLB record.
Building Permits
Source: LA City Open Data (LADBS)
otc alterations permit
2135 45th Av, 94116
to obtain final inspection for work approved under pa# 9908627s. all work is complete
$1
2026-03-18
otc alterations permit
1401 39th Av, 94122
interior remodel of 2nd fl apt unit. demo (e) bathroom and (e) bedroom. build (n) 3rd bedroom, (n) kitchen, two (n) bathrooms, and (n) closets. removal wall at lightwell
$260,000
2025-09-11
otc alterations permit
110 Castenada Av, 94116
repair e) front roof deck. remove e) tile & concrete slab. install new waterproof decking & new matel guard
$18,000
2025-06-12
otc alterations permit
2732 Green St, 94123
replace in kind 12 existing wood, double hung windows at the front facade. new replacement windows shall be painted wood framed, double hung, double glazed windows to match existing.
$102,000
2025-06-05
otc alterations permit
4146 Fulton St, 94121
reframe garage door opening, install nw overhead door, install new trench drain. remove extg 2nd f. interior walls, install n post & beams. remodel kitchen with n cabs, counter, elect, lighting $ plmg
$52,000
2018-12-31
otc alterations permit
582 Corbett Av, 94114
revision to pa 2017-0714-1968 - remove (e) dropped header beam in kitchen and install new recessed (flush) beam in ceiling.
$2,000
2017-09-06
otc alterations permit
582 Corbett Av, 94114
unit 580 & 582: in each unit remodel (e) kitchen in-kind, install new cabinets, counter top, new appliances, new electrical & lighting, new sink/faucet. no walls moved/removed/added/infilled. all (e)
$42,000
2017-07-14
otc alterations permit
1825 Sutter St, 94115
remodel 3rd flr bathroom incl (n) shower, lav & w.c., lighting; install 3 (n) skylights & (n) 1-hr rated parapet wall.
$36,000
2014-10-28
Verify this record on the official state licensing board
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