Permit GraphShortlistSan Francisco building permits since 2000

Block 2057, lot 008

1839 20th Ave

City’s use
Single Family Residential
Built
1927
Stories
1
Units
1
Rooms
3 bedrooms, 3 bathrooms
Building
2,202 sq ft
Lot
2,996 sq ft
Zoning
RH1
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

3 permits filed for this property since 2000.

CompletedIn progressNever finaledExpired or cancelled
FiledOutcomeAddressContractorWork described on the permitDeclared cost
Sep 30, 2025Completed
final sign-off Nov 2025
1839 20th AvAmerican Standard Roofing Incre-roofing: remove and replace roofing material / existing roofing material (in-kind)
Details
Permit
202509306385
Status
complete
Filed
Sep 30, 2025
Permit issued
Oct 1, 2025
Final sign-off
Nov 25, 2025
Declared cost
$16,000
Address
1839 20th Av

re-roofing: remove and replace roofing material / existing roofing material (in-kind)

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$16,000
Sep 21, 2015Completed
final sign-off Sep 2015
1839 20th AvSure Roofing Systems/R.O.Choyreroofing
Details
Permit
201509217522
Status
complete
Filed
Sep 21, 2015
Permit issued
Sep 21, 2015
Final sign-off
Sep 24, 2015
Declared cost
$22,000
Address
1839 20th Av

reroofing

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$22,000
Mar 11, 2011Completed
final sign-off Feb 2012
1839 20th AvT J Constr Inc***Ck Id,Tie Liu Only*****add family room, office & full bath @ ground floor. rebuilt interior stair. enclose lower space for office.
Details
Permit
201103111897
Status
complete
Filed
Mar 11, 2011
Permit issued
May 4, 2011
Final sign-off
Feb 13, 2012
Declared cost
$45,000
Address
1839 20th Av

add family room, office & full bath @ ground floor. rebuilt interior stair. enclose lower space for office.

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$45,000

Who worked here

Everyone with a license on these permits, by role, with how many permits each is on.

Contractors
American Standard Roofing Inc, Sure Roofing Systems/R.O.Choy, T J Constr Inc***Ck Id,Tie Liu Only*****
Architects
Michael Hsiao
Engineers
Emmanuel Pun

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