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Thaddeus Jeffrey Plonowski

Architect · Plonowski Architects+Builders · Mill Valley

Public records

From the licensing board and the city of San Francisco.

The short answer

Licensed?
License activeArchitect C-23049First issued Feb 20, 1992, expires Jun 30, 2027.

Source: DCA license roster, retrieved Nov 5, 2026

Verify on DCA License Search

Any board discipline?
None found.

We searched the California Architects Board enforcement list on Nov 5, 2026.

Worked in San Francisco?
16 permits since 2005, 16 in the last 5 years. Latest filed Sep 10, 2025.
What kind of projects?
Home remodel 7 · Addition 3 · Legalize or fix a violation 2
How long do their permits take?
Home remodel: within 1 month. City typical for the same review: within 1 month.

Permits filed each year

San Francisco permits by the year they were filed. The last 5 years are in blue.

What are you planning?

Pick your kind of project to see their permits for it.

Permits
19 permits that name Thaddeus Jeffrey Plonowski, newest first, including 3 revisions or supplements that are not counted. Select a permit to see the full record.
FiledProjectOpen
May 8, 20261401 39th Av

Revision for as-built floor plans to 202509105036: add coat closet, revise bathroom layout, relocate laundry. new furnace under separate permit.

Issued
Sep 10, 20251401 39th Av

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

Complete
Jun 12, 2025110 Castenada Av

Repair e) front roof deck. remove e) tile & concrete slab. install new waterproof decking & new matel guard

Complete
Aug 17, 2023233 Lincoln Wy

Interior remodeling to build a new 1-bedroom unit at 1st flr. (legal unit under density), new unit to include new kitchen, living and closets and laundry closet.

Complete
Dec 27, 2019450 14th St

Legalization of (e) unit built w/o permit per ord# 43-14. install (n) elec. in (e) kitchen. install (n) fire sprinklers in unit.**maher n/a**

Filed
Dec 28, 20184146 Fulton St

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, install n washer/dryer at 3rd fl. replace e clay f.p. flue w/new metal pipe.

Issued
Sep 6, 2017580 Corbett Av

Revision to pa 2017-0714-1968 - remove (e) dropped header beam in kitchen and install new recessed (flush) beam in ceiling.

Complete
Oct 16, 20151825 Sutter St

Remodel kitchen @ 2nd floor - install (n) cabinets, counters, appliances, (2) new sinks & faucets, (n) lighting /electrical. replace exisitng windows & french doors w/new. build wood 8" box for shelf niche.

Complete
Oct 1, 20141825 Sutter St

Remodel 3rd flr bathroom incl (n) shower, lav & w.c., lighting; install 3 (n) skylights & (n) 1-hr rated parapet wall.

Issued
Mar 4, 20142123 Bush St

Remodel 1st floor apartment. kitchen, 2 baths, laundry room, new windows/doors. remove walls at rear of apt and install new stuctural. remove (e) shed and porch at rear and install new deck at grade.

Withdrawn
Mar 26, 20121 Panorama Dr

Install approx 7 lin ft of new 1 hour rated 2x4 wall in e garage, to form new tv room. install new 20 min rated door in new wall

Complete
Jan 20, 2012180 Guerrero St #0

Remove (e) kitchen on 1st floor. install (n) rooms, (n) bath and (n) staircase on 1st floor. including (n) structural work for stair. remodel (e) kitchen and bathroom on 2nd foor - unit #180. (interior remodeling). comply with his nov #

Complete
Jun 3, 20101821 Sutter St

Work is 1821 sutter st.: interior remodeling to (e) apartment unit at the 1st. flr.; install (n) post & beams, remodel kitchen & bathroom, install (n) window & doors. (n) elec., plumbing, flooring & gypsum board & paint.

Expired
Jun 19, 20081343 Oak St

Rebuild in kind existing exterior front entry staircase,including new reinforced concrete footings, new cmv walls, new concrete treads and risers. also includes demo of existing staircase. revision to appl. # 200507016684, 200806104037.

Issued
Dec 11, 2007215 Tingley St

Rebuild existing front entry staircase in kind. (e) top landing to remain.

Expired
Sep 11, 2007215 Tingley St

Build new 3rd story addition (partial) +/-20'x25' including (n) bedroom, roof deck and bathroom. remodel 1/f to include (n) living, kitchen, bath and laundry, minor interior remodeling at 2/f

Expired
Mar 30, 2007195 Alhambra St

Unit #3; 2nd floor-note: fire alarm for elevator recall on seperate permit. install new elevator and new 1 hour rated shaft in garage at the 1st floor through to the apartment on the 2nd floor. note: private elevator serving one apartment#3.

Complete
Dec 20, 2005205 Cotter St

Raise house 3 ft. install new foundation, build new 3rd story addition. rebuild (e) sotricases, add new stair from 3rd flr, install new elevator. minor interior remodeling @ (e) 1st & 2nd floors.

Complete
Jul 1, 20051343 Oak St

New foundation & support for building. excavate to extend (e) garage for storage space. w/(e) bldg

Issued

Sources: DataSF i98e-djp9, 3pee-9qhc, retrieved Nov 5, 2026. Names on permits are matched to licenses by license number and name; unmatched records are not shown.

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