Permit Record

Alteration Residential

21 Mayfair Dr, San Francisco, Ca, 94118

Classificationotc alterations permitMultifamily Alteration
Reliable value$1,500
ContractorNot in source
Permit record
Parties
Contractor
Not in source
Applicant
Not in source
Owner
Not in source
Architect
Not in source
Engineer
Not in source
Contractor license
Not in source
Building & lot · PLUTO
Building class
Not in source
Zoning district
Not in source
Lot area
Not in source
Year built
Not in source
Units (total)
Not in source
Units (residential)
3
Units (commercial)
Not in source
Floor area
Not in source
Parcel & enrichment
Parcel APN
1045 023
Climate zone (IECC)
3C
Roof area (est.)
Not derivable — no building-size signal for this permit
HVAC tonnage (est.)
Not derivable — no building-size signal for this permit
Building type
Not in source
Building subtype
apartments
Geocode & dates
Coordinates
37.7859, -122.4500
Geocode confidence
95%
Geocode source
Not in source
Issued
Oct 19, 2023
Applied
Oct 19, 2023
Work class
Residential
Description
Source description

added layer of sheetrock for sound proofing in ceiling in kitchen and livingroom.

Status
Current status
finaled
Source status
complete
Finaled
Nov 3, 2023
Provenance
First seen by PermitCore
May 2, 2026 · 23:53 UTC
Last seen
May 12, 2026 · 00:07 UTC
Last changed
May 12, 2026 · 00:07 UTC

Open in San Francisco source →

Data-quality checks0 of 12 flagged

0 of 12 data-quality rules flagged anything on this permit.

Checks not flagged

  • Geocode out of bounds
  • Geocode is sentinel
  • Issued date in the future
  • Issued date parse bug
  • Issued date is placeholder
  • Commercial units is placeholder
  • Residential units out of bounds
  • Residential units is placeholder
  • Total units out of bounds
  • Total units is placeholder
  • Valuation out of bounds
  • Valuation is placeholder
Project timeline at this parcel

13 permits at this parcel (parcel 1045 023) · through Oct 19, 2023

  1. Oct 19, 2023This permitAlteration Residential · Finaled$1,500
  2. Jan 31, 20231661109273606Alteration Residential · Finaled$50,000
  3. Jan 31, 20231661110273607Alteration Residential · Finaled$50,000
  4. Apr 1, 2022163970288109Alteration Residential · Finaled$3,000
  5. Jun 20, 20191557065273607Alteration Residential · Finaled$2,000
  6. Jun 20, 2019155706488109Alteration Residential · Finaled$2,000
  7. Oct 24, 20121286592273607Alteration Residential · Finaled$14,985
  8. Oct 24, 20121286591273606Alteration Residential · Finaled$14,985
  9. Oct 24, 2012128659088109Alteration Residential · Finaled$14,985
  10. Date not usable in source689154273607Alteration Residential · Finaled$25,000
  11. Date not usable in source559565273606Alteration Residential · Finaled$20,000
  12. Date not usable in source370928273607Alteration Residential · Expired$5,345
  13. Date not usable in source240887239019Alteration Residential · Finaled$5,000

Full permit history at this parcel · as of Jul 9, 2026.

Developer details
Permit #
1680867273606
Canonical ID
6:1680867273606
Source permit ID
1680867273606
Browse San Francisco permits in the Market Explorer →Pull this permit via /v1/permits →