Block 3610, lot 049
3421 20th St
- City’s use
- Multi-Family Residential
- Built
- 1906
- Stories
- 3
- Units
- 6
- Rooms
- 6 bathrooms
- Building
- 6,390 sq ft
- Lot
- 2,996 sq ft
- Zoning
- RM1
- Construction type
- D
From the assessor's latest secured roll, which can lag recent work. Lot plans, zoning and planning history on the city’s Property Information Map
Permits filed here
23 permits filed for this property since 2000.
| Filed | Outcome | Address | Contractor | Work described on the permit | Declared cost |
|---|---|---|---|---|---|
| Aug 24, 2026 | In progress issued Aug 2026 | 3421 20th St | to comply nov 201977811 and 202182465- 2- provide repair wood rot, 3- repair hadnrails, 4, provide guard rail. all located at rearDetails
to comply nov 201977811 and 202182465- 2- provide repair wood rot, 3- repair hadnrails, 4, provide guard rail. all located at rear | $3,000 | |
| Feb 10, 2026 | In progress issued Feb 2026 | 3421 20th St | Advance Energy Construction Inc | recommencement and completion of work approved under 201803295058 and 202009275177Details
recommencement and completion of work approved under 201803295058 and 202009275177 | $280,000 |
| Sep 13, 2024 | In progress issued Jul 2025 | 3421 20th St | Advance Energy Construction Inc | as built revision for bpa# 201612306363 and 202002073886: structural plan update framing and foundation.Details
as built revision for bpa# 201612306363 and 202002073886: structural plan update framing and foundation. | |
| Sep 13, 2024 | In progress issued Jul 2025 | 3421 20th St | Advance Energy Construction Inc | replace furnace & water heaters ( no fire rated assembly penetration). 2/f , 3/f & 4/f (total 6 units)Details
replace furnace & water heaters ( no fire rated assembly penetration). 2/f , 3/f & 4/f (total 6 units) | $24,000 |
| Aug 20, 2024 | Completed final sign-off Aug 2024 | 3427 20th St | 1) repair /replace 3 vinyl windows at rear backyard wall, side wall 2) repair broken glass sidewallDetails
1) repair /replace 3 vinyl windows at rear backyard wall, side wall 2) repair broken glass sidewall | $980 | |
| May 6, 2024 | Completed final sign-off Aug 2024 | 3427 20th St | to abate nov 202307809- #2- repair window sill; #5- repair stairs; #11-repair damaged walls; #12-repair floorDetails
to abate nov 202307809- #2- repair window sill; #5- repair stairs; #11-repair damaged walls; #12-repair floor | $3,500 | |
| Dec 20, 2023 | In progress issued Jan 2024 | 3421 20th St | siding replacement at rear walls, waterproofing side wallsDetails
siding replacement at rear walls, waterproofing side walls | $15,000 | |
| Oct 31, 2023 | In progress issued Oct 2023 | 3421 20th St | San Francisco Fire Protection | as builts to pa 202309267461. install 2 new monitor modules on ground fl to tie-in new floor and tamper switches to (e) contorl panel.Details
as builts to pa 202309267461. install 2 new monitor modules on ground fl to tie-in new floor and tamper switches to (e) contorl panel. | $1,000 |
| Sep 26, 2023 | Never finaled issued Sep 2023, no final | 3421 20th St | San Francisco Fire Protection | upgrade (e) fire alarm system to meet sec 1103.7.6.1. (e) control panel & initiating devices stay @ their original location. (e) bells will be replaced w/horn strobes; install new power supply panel; 4 new pull stations & 2 new horn/strobes; new low frequency horns inside all units.Details
upgrade (e) fire alarm system to meet sec 1103.7.6.1. (e) control panel & initiating devices stay @ their original location. (e) bells will be replaced w/horn strobes; install new power supply panel; 4 new pull stations & 2 new horn/strobes; new low frequency horns inside all units. | $15,000 |
| Aug 4, 2022 | Never finaled issued Aug 2022, no final | 3421 20th St | to obtain final inspection for work approved under pa# 2016-1230-6363 and 2020-0207-3886: all work is complete.Details
to obtain final inspection for work approved under pa# 2016-1230-6363 and 2020-0207-3886: all work is complete. | ||
| Aug 1, 2022 | Never finaled issued Aug 2022, no final | 3427 20th St | Advance Energy Construction Inc | 3427/3429/3431 20th street: each unit: remodel (e) kitchen and bathroom including any dry rot repair and replacement all in-kind. each unit add 1 bathroom and washer/dryer laundry box.Details
3427/3429/3431 20th street: each unit: remodel (e) kitchen and bathroom including any dry rot repair and replacement all in-kind. each unit add 1 bathroom and washer/dryer laundry box. | $80,000 |
| Jun 6, 2022 | Never finaled issued Jun 2022, no final | 3421 20th St | Magnum Construction Group Inc | install new fire sprinkler system per nfpa 13 for the ground floor only. included 2" underground fire service. total 26 heads.Details
install new fire sprinkler system per nfpa 13 for the ground floor only. included 2" underground fire service. total 26 heads. | $20,000 |
| Feb 3, 2022 | Never finaled issued Feb 2022, no final | 3421 20th St | Advance Energy Construction Inc | to comply with boa 21-094 (pa 202103317623). work in unit 3421, 3423 and 3425. kitchen and (e) bathroom remodel and decay repair and replace in kind, add bathroom and washer/dryer. window replacement on 2nd, 3rd, 4th floors as in kind (same size/location and function) with front windows to be woodDetails
to comply with boa 21-094 (pa 202103317623). work in unit 3421, 3423 and 3425. kitchen and (e) bathroom remodel and decay repair and replace in kind, add bathroom and washer/dryer. window replacement on 2nd, 3rd, 4th floors as in kind (same size/location and function) with front windows to be wood | |
| Mar 31, 2021 | Never finaled issued Sep 2021, no final | 3421 20th St | Advance Energy Construction Inc | units 3421, 3423, 3425: relocate kitchen and convert pantry into bathroom, and kitchen into bedroom on all 3 units. window replacement on 2nd, 3rd, 4th flrs in kind. front windows replacement in kind with wood ogee and true dividers.Details
units 3421, 3423, 3425: relocate kitchen and convert pantry into bathroom, and kitchen into bedroom on all 3 units. window replacement on 2nd, 3rd, 4th flrs in kind. front windows replacement in kind with wood ogee and true dividers. | $115,000 |
| Sep 27, 2020 | Never finaled issued Jan 2021, no final | 3421 20th St | Lordan Construction | rev to pa202002073886 & pa201612306363: comply to complaint 201901291-revise foundation & excavate soile at rear of building (approx 126 cy).Details
rev to pa202002073886 & pa201612306363: comply to complaint 201901291-revise foundation & excavate soile at rear of building (approx 126 cy). | $80,000 |
| Feb 7, 2020 | Expired or cancelled expired Jun 2022 | 3421 20th St | Lordan Construction | revise pa# 201612306363; revise fondation and sequenceDetails
revise pa# 201612306363; revise fondation and sequence | $40,000 |
| Oct 11, 2019 | Never finaled issued Oct 2019, no final | 3421 20th St | street spaceDetails
street space | ||
| Mar 29, 2018 | Never finaled issued Mar 2021, no final | 3421 20th St | Lordan Construction | two (n) adu units per ord# 162-17, each w/ 1 bedrm, 1 bath on 1st flr.Details
two (n) adu units per ord# 162-17, each w/ 1 bedrm, 1 bath on 1st flr. | $80,000 |
| Aug 31, 2017 | Completed final sign-off Sep 2017 | 3421 20th St | comply w/complaint # 201795451 to repair holes in floors at rear structure w/in like materialDetails
comply w/complaint # 201795451 to repair holes in floors at rear structure w/in like material | $3,000 | |
| Jun 19, 2017 | Completed final sign-off Jun 2017 | 3423 20th St | Aaa Windows For Less | replace existing aluminum windows with new double pane vinyl windows. all windows located in the back of the bldg. u-0.31, shgc - 0.29.Details
replace existing aluminum windows with new double pane vinyl windows. all windows located in the back of the bldg. u-0.31, shgc - 0.29. | $3,980 |
| May 23, 2017 | Completed final sign-off Jul 2017 | 3421 20th St | San Francisco Fire Protection | like for like voluntary fire system replacement withnew control panel, smoket detector, pull station at same location. install radio communicator to communicate with central station. will comply with sffc sec 1103.761 by 2021Details
like for like voluntary fire system replacement withnew control panel, smoket detector, pull station at same location. install radio communicator to communicate with central station. will comply with sffc sec 1103.761 by 2021 | $3,000 |
| Dec 30, 2016 | Expired or cancelled expired Jun 2022 | 3421 20th St | Advance Energy Construction Inc | mandatory soft story upgrade per ord 6613 retrofit gr fl per a4 cbc 2013 75%Details
mandatory soft story upgrade per ord 6613 retrofit gr fl per a4 cbc 2013 75% | $80,000 |
| Dec 23, 2015 | Completed final sign-off Jan 2016 | 3421 20th St | American Roofing Co **Pls See 432216*** | reroofingDetails
reroofing | $16,700 |
Who worked here
Everyone with a license on these permits, by role, with how many permits each is on.
- Contractors
- Advance Energy Construction Inc (7), Lordan Construction (3), San Francisco Fire Protection (3), Aaa Windows For Less, American Roofing Co **Pls See 432216***, Magnum Construction Group Inc
- Architects
- Ronald Gate Yu (2)
- Engineers
- Ronald Yu (7), Ronald Gate Yu
- Designers
- Jobeen Tsang
Find contractors for work like this
Starts from the last permit filed here; change it to describe your own project. Results cover apartment buildings like this one.