Converted · ground-floor conversion · Chinatown
1342 Mason St
In progress+1 unit on this lot · now 87 permits
Addition of one (1) accessory dwelling unit (ADU), per state law, to an existing seven (7) unit building; total of 8 units. The proposed ADU will be located within existing building envelope at the ground floor.
filed May 2021issued Mar 2023 · permit wait 1 year 10 months3 years 8 months since issue
waiting for permitconstructionrelated building permitelectrical permitplumbing permit
Declared value
$118,642
declared across 3 permits: the ADU permit plus its sub-permits
Permit wait
1 year 10 months
filed → issued
Build time
in progress
issued → completed
Permits in this project
| Permit | What | When | Declared | |
|---|---|---|---|---|
| ADU permit | Addition of one (1) accessory dwelling unit (ADU), per state law, to an existing seven (7) unit building; total of 8 units. The proposed ADU will be located within existing building envelope at the ground floor. 202105100075 · B M D C Llc | filed May 2021 · issued Mar 2023 | $73k | city record |
| Related permit | Structural alteration per ADU project under 202105100075. Structural alteration to 2nd floor framing. Notch joiste to increase ceiling height of unit 1342c near gridline a. New landing and concrete steps. New wall footing and load bearing shearwall along grid 4. 202304065229 · cites 202105100075 · B M D C Llc | filed Apr 2023 · issued Apr 2023 | $15k | city record |
| Sprinklers | Install a new nfpa 13r aytinatuc wet pipe, fire sprinkler system in one apu only on the first floor only if 4 story building install new dedicated underground fire service 2' copper-k propress fitting. Ref pa# 202105100075. 202304266520 · cites 202105100075 · All Systems Approved INC | filed Apr 2023 · issued Aug 2023 | $31k | city record |
| Electrical | New fire alarm system. EW202305251378 | May 25, 2023 | — | |
| Electrical | ADU unit electrical wiring. EW202306061639 | Jun 6, 2023 | — | |
| Electrical | Wire in additional ADU. Studio unit with sub panel. EW202512181618 | Dec 18, 2025 | — | |
| Plumbing | Work category: 1p; this permit is to continue ADU work began under permit # pp20230420552. One bathroom, 1 kitchen 1 laundry. PW20251117606 | Nov 17, 2025 → Jul 20, 2026 | — |
1 other permit on this lot during the project, not counted
| Other | Unit# a: new sheetrock and finishes throught one bedroom unit, install 5 new windows in lightwells, same opening size and type. 202304055103 · B M D C Llc | filed Apr 2023 · issued Apr 2023 · done May 2023 | $5,125 | city record |
Trade permits show what work was done and when; the city does not record who pulled them.
- Lot
- block 0180, lot 043
- Why we call it an ADU
- SF DBI flagged the permit as an ADU.