4106 20th Street

Castro (Eureka Valley) · San Francisco, CA 94114

  • Built 1905
  • Single-family house
  • 1 story
  • Zoned RH-1
  • District 8
  • Historic status: unevaluated
37.7580, −122.4328 Street View appears here once a Google Maps embed key is configured.
1,050 sq ftBuilding area
2,448 sq ftLot area
6Rooms · 1 bath

Permit history

  1. May 2026

    Solar permit: installing 17 solar pv modules, 440 watts per module, total no. of rating 7.48 kw. mounted: roof, ballasted: n, including 2 energy storage unit, with 13.5 kwh each in capacity, ess units will not be closer than 3 feet | installation of roof-mounted utili.

    Issued Permit S20260514610 $$$ $46,561
  2. Jan 2026

    Reroofing: remove and replace roofing material / existing roofing material (in-kind).

    Complete Permit 202601284772 $$$ $14,000
  3. Feb 2015

    Replace existing skylight with new velux 2'x4'. remove 10 sq ft. of rotten siding on back wall. replace rotten casings around base door. install new 2 flashing over back window & door.

    Complete Permit 201502138301 $$$ $3,000
  4. Oct 2005

    Replace concrete front stairs. new foundation (section). remove/replace rotten wood. replace basement window.

    Complete Permit 200510075057 $$$ $10,000
  5. Jul 2005

    Install 2 18"x18" x24" depth underpinnings to west side of front stair where current fndtn is sink.

    Issued Permit 200507147551 $$$ $2,500
  6. Jan 2004

    Remove brick chimney from roof to 1st floor level. patch hole in roof. chimney not visible from the.

    Complete Permit 200401083567 $$$ $1,200
  7. Apr 1997

    Reroofing.

    Complete Permit 9706277 $$$ $7,880

1 nominal $1 street-space permit is omitted.

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