Attached · Noe Valley
755 Duncan St
Completed Jun 2026+1 unit on this lot · now 28 permits
Proposed horizontal & vertical addition to expand the existing unit & add one additional ADU unit.
filed Mar 2023issued Oct 2025 · permit wait 2 years 7 monthscompleted Jun 2026 · built in 8 months
waiting for permitconstructionrelated building permitelectrical permitplumbing permit
Declared value
$1,560,320 + other work
the permit also covers work unrelated to the ADU, so this is not an ADU price
Permit wait
2 years 7 months
filed → issued
Build time
8 months
issued → completed
Permits in this project
| Permit | What | When | Declared | |
|---|---|---|---|---|
| ADU permit | Proposed horizontal & vertical addition to expand the existing unit & add one additional ADU unit. 202303103512 · O Donoghue Construction INC | filed Mar 2023 · issued Oct 2025 · done Jun 2026 | $1.4M | city record |
| Related permit | Provide excavation sequence and shoring to accommodate foundation installation. Bpa#: 202303103512. 202510167472 · cites 202303103512 · O Donoghue Construction INC | filed Oct 2025 · issued Oct 2025 · done Jun 2026 | $80k | city record |
| Sprinklers | Install new fire sprinkler system for the building throughout include 1. 25 in underground combination fire service total heads 55. 202602115727 · Magnum Construction Group INC | filed Feb 2026 · issued Feb 2026 · done Jun 2026 | $68k | city record |
| Revision | Revision to 202303103512. Add new roof deck at e roof. Provide new operable skylight for roof access. Provide new interior from 3rd floor to roof deck. Provide new 30' high 1 hr rated parapet adjacent to skylight opening for fire protection. 202604240047 · cites 202303103512 · O Donoghue Construction INC | filed Apr 2026 · issued Jun 2026 · done Jun 2026 | $13k | city record |
| Electrical | Rewiring entire house. Upgrade electrical service to 200 a and wiring ADU. EW202511170938 | Nov 17, 2025 → Jun 15, 2026 | — | |
| Plumbing | Work category: 2pb; 1). Ground floor ADU two bathrooms. One kitchen and one catch basin in the back yard. 2) second floor two bathrooms, one laundry and one kitchen 3) third floor. Two bathrooms this job total have two bathtubs four showers and with underground work. PW20260114845 | Jan 14, 2026 → Jun 12, 2026 | — | |
| Plumbing | Work category: 1m; install 3 heat pump system including one for the ADU. PMW20260220767 | Feb 20, 2026 → Jun 10, 2026 | — | |
| Plumbing | Work category: 4pa; install new fire sprinkler for the building throughout. , including 1-1/4" underground fire service. Total =55 heads. PW20260303029 | Mar 3, 2026 → Jun 17, 2026 | — |
Trade permits show what work was done and when; the city does not record who pulled them.
- Lot
- block 6605, lot 026
- Why we call it an ADU
- Two independent model reviewers agreed the permit creates an ADU: “"proposed horizontal & vertical addition to expand the existing unit & add one additional adu unit"; units 1 → 2, 1 family dwelling → 2 family dwelling”