Know This Place

3921 18th Street

Castro (Eureka Valley) · San Francisco, CA 94114

  • Built 1900
  • Single-family house
  • 1 story
  • Zoned RH-3
  • District 8
  • Historic status: unevaluated
37.7609, −122.4311 Street View appears here once a Google Maps embed key is configured.
1,565 sq ftBuilding area
2,848 sq ftLot area
7Rooms · 1 bath

Permit history

  1. Feb 2026

    Improve front facade appearance by adding decorative trims and ornaments.

    Filed Permit 202602276721 $$$ $6,000
  2. Oct 2025

    1st fl convert storage into habitable space to include 2 bedroom, 2 bath and laundry. install a tankless water and furnace in garage. enlarge garage door. 2nd fl: reconfigure interior layout. remove attic at rear.

    Filed Permit 202505065904 $$$ $500,000
  3. Feb 2008

    Reroofing.

    Issued Permit 200802265582 $$$ $7,950
  4. Oct 1993

    Replace existing foundation approx 36' long raise n/foundation.

    Complete Permit 9317693 $$$ $18,000

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