Alexander Nachum Stadtner
- Listed as
- authorized agent-others, contractor
- Firm
- Healthy Building Science Inc
- Based in
- San Rafael
- On San Francisco permits
- Jul 2022 to Aug 2026
7 permits since 2000 (contractor on 7 permits, authorized agent-others on 1 permit): 1 completed, 6 in progress.
This is the city’s permit record, not a license check: the role and the number come from what was written on each permit (the number spelled one way). It does not show whether the license is current. Their ranked record as a contractor is on their contractor page. How to read these records
Most recent permits
| Filed | Outcome | Address | Contractor | Work described on the permit | Declared cost |
|---|---|---|---|---|---|
| Aug 28, 2026 | In progress issued Aug 2026 | 2277 33rd Av | Healthy Building Science Inc | revision to pa #202606042578: demo lower roof & sheating +replaced w/sheathing, cover board+membrane roof. the roof deck will be rebuilt over sleepers parapet walls that act as guardrails on the north+south sides of the deck. metal guardrails added on east+west sides of deck. roof guards+ leadersDetails
revision to pa #202606042578: demo lower roof & sheating +replaced w/sheathing, cover board+membrane roof. the roof deck will be rebuilt over sleepers parapet walls that act as guardrails on the north+south sides of the deck. metal guardrails added on east+west sides of deck. roof guards+ leaders | $223,969 |
| Jul 23, 2026 | In progress issued Jul 2026 | 1347 40th Av | Healthy Building Science Inc | revision to #202603167679. material change to wall assembly located in exterior breezeway. replace gympsum with lp fireblock osb to provide fire protection for exterior application.Details
revision to #202603167679. material change to wall assembly located in exterior breezeway. replace gympsum with lp fireblock osb to provide fire protection for exterior application. | |
| Jul 23, 2026 | In progress issued Jul 2026 | 1347 40th Av | Healthy Building Science Inc | bathroom remodel in kind. no change to floor layout. no change to wall layout. no structural work.Details
bathroom remodel in kind. no change to floor layout. no change to wall layout. no structural work. | $25,000 |
| Jun 4, 2026 | In progress issued Jun 2026 | 2277 33rd Av | Healthy Building Science Inc | demolition and reconstruction of (e) roof deck. (e) metal guardrail to be refurbished and re-utilized. add gutter + rain leaders connected to sewer line.Details
demolition and reconstruction of (e) roof deck. (e) metal guardrail to be refurbished and re-utilized. add gutter + rain leaders connected to sewer line. | $25,000 |
| Apr 14, 2026 | In progress issued May 2026 | 1347 40th Av | Healthy Building Science Inc | convert existing conditioned space on street level to adu.Details
convert existing conditioned space on street level to adu. | $185,000 |
| Dec 18, 2025 | In progress issued Dec 2025 | 2277 33rd Av | Healthy Building Science Inc | replacement of install furnace. remove & replace air supply + intake grills, seal all boots to ducting - replace partial crushed duct. install new plenum + air filter bexDetails
replacement of install furnace. remove & replace air supply + intake grills, seal all boots to ducting - replace partial crushed duct. install new plenum + air filter bex | $14,205 |
| Jul 1, 2022 | Completed final sign-off Jul 2022 | 1539 Sanchez St | Healthy Building Science Inc | sidind and trim replacement of north and east facade (backyard). prime and paint not visible from street. entire wall at north and east. replace/repair in kind.Details
sidind and trim replacement of north and east facade (backyard). prime and paint not visible from street. entire wall at north and east. replace/repair in kind. | $60,000 |