3643 20th Street

Mission · San Francisco, CA 94110

  • Built 1900
  • Single-family house
  • 2 stories
  • Zoned RH-3
  • District 9
  • Historic status: historic resource
37.7582, −122.4222 Street View appears here once a Google Maps embed key is configured.
1,250 sq ftBuilding area
2,874 sq ftLot area
11Rooms · 3 bed, 3 bath

Permit history

  1. Nov 2025

    Reroofing. no hotworks or torch down.

    Complete Permit 202511179790 $$$ $25,000
  2. Feb 2022

    Modify entrance stairs, roof deck at front, expand garage storage.

    Cancelled Permit 202202017078 $$$ $60,000
  3. Jul 2019

    Administrative permit to pay penalty fees on nov#201969421 that were not assessed on permit application 201903014147 - 2 x $20, 000 per sfbc106a.4.

    Complete Permit 201907297259 $$$ $1
  4. Jul 2019

    Revision to app#201803163818 including revision to main floor bathroom and closet layout and addition of construction details.

    Complete Permit 201907014834 $$$ $1
  5. Mar 2019

    Addition of living space to existing 9'-3" tall basement within building envelope. addition shall include new bedroom, 2 bathrooms, entertainment room and den. new stairs from main floor to basement.

    Complete Permit 201903014147 $$$ $45,000
  6. Aug 2018

    Remove existing wood windows and door at rear and replace with new aluminum-clad wood windows and door; change in window area not to exceed 81 square feet total. infill with wood siding in-kind as necessary. excavation for new stair and patio.

    Complete Permit 201808278447 $$$ $40,000
  7. Jun 2018

    Rev to permit application 201712217172; revised details for south wall foundation.

    Complete Permit 201806040919 $$$ $1
  8. May 2018

    Revision to permit application 201712217172 revised detail at west property line foundation.

    Complete Permit 201805219650 $$$ $1
  9. Mar 2018

    Interior remodel including remodel of existing bedrooms & kitchen remodel. addition of new loft space within building envelope.

    Complete Permit 201803163818 $$$ $40,000
  10. Dec 2017

    Foundation replacement & new slab on grade in crawl space. voluntary seismic upgrades.

    Complete Permit 201712217172 $$$ $50,000
  11. Feb 1990

    Foundation restoration.

    Complete Permit 9002304 $$$ $10,000

4 nominal $1 street-space permits are omitted.

Not yet documented: the architect and builder and the early residents. Know any of it? Tell us — just describe it in plain words.