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Duffin Construction

General Building Contractor · San Francisco, CA
Active license
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License1 record · Active license
Permits98 on file
Discipline / legalNo board discipline flag
BBBNot yet available
Phone(415) 340-3044
AddressP O Box 210639

Report verdict

Licensed & active (expires 2027-03-31) · No board discipline flag found in covered sources · 98 permits on file

88/100 HomeProFax Score — public-record factors only, not a rating of workmanship. How the score works Full report

The state board is the authority. A flag is a prompt to read the board record, not a verdict. Verify license status with the issuing board before you hire. See methodology and disclaimer & corrections.

What this report checks

✓ License
Checked
1 board record(s) · Active license
✓ Discipline & legal
Checked
No board discipline flag found in covered sources.
✓ Permits
Checked
98 permit(s) on file from covered city sources.
◐ Reviews & complaints
Where available
BBB where researched and approved HomeProFax reviews only; external ratings are linked below, not stored or scored.

Score breakdown

FactorPointsWhy
License status35/35
Active license on file with a state board
Discipline & legal flags20/20
No disciplinary flag on board record
Permit history20/20
98 permits on file
Reviews (BBB + HomeProFax)13/25
No BBB rating on file and no approved HomeProFax reviews yet (neutral). External ratings are linked below, not stored

A simple, transparent sum of public-record factors. How the score works. Not a rating of workmanship.

Source data as of: Report rebuilt from source files on 2026-10-19 · CSLB bond/workers' comp as of 2026-10-14 · most recent permit on file: 2023-04-21.

What we checked

LicenseCheckedCA Sole Owner #760636 · active
BondChecked$25,000 with JET INSURANCE COMPANY · as of 2026-10-14
Workers' compCheckedWorkers' Compensation Insurance (STATE COMPENSATION INSURANCE FUND) · as of 2026-10-14
Years licensedCheckedLicensed since 1999
Business registrationNot available in CAState business registry not loaded yet
PermitsChecked98 permits on record
DisciplineCheckednone on record
OSHANot checked yetOSHA records not checked yet
Reviews & outside linksNot checked yetNo review lookup run yet
Contractor-providedNot checked yetNothing provided by the contractor yet

Public records as of their source dates. Board status is shown as reported by the board. Not a guarantee. Ask the contractor for their verified HomeProFax report.

Licenses

Licensed since 1999 (earliest original issue date on these state license records; not a business start date)

License #TypeStatusIssuedExpiresSource
CA 760636Sole Owner (B)
Workers' comp: Workers' Compensation Insurance (STATE COMPENSATION INSURANCE FUND); Contractor bond: $25000 (JET INSURANCE COMPANY)		clear1999-03-192027-03-31State board

Bond & workers' comp

Contractor bond$25,000 · JET INSURANCE COMPANY · effective 2026-09-01
Workers' compWorkers' Compensation Insurance · STATE COMPENSATION INSURANCE FUND · effective 2023-03-12 · expires 2027-03-12

Source: CSLB Public Data Portal (License Master), as of 2026-10-14. Verify current bond and insurance with CSLB and the insurer before you hire.

Building permits

DatePermitTypeAddressValue
2023-04-21202303294602otc alterations permit639 34th Av$10,000
2022-09-08202010096277additions alterations or repairs321 Coleridge St$80,000
2022-08-19202109148427additions alterations or repairs639 34th Av$500,000
2022-01-25202201256589otc alterations permit48 Clarendon Av$1
2021-09-03202109037750otc alterations permit88 Entrada Ct$50,000
2021-05-20202105200668otc alterations permit887 28th Av$1,000
2021-05-13202104289491otc alterations permit65 Almaden Ct$10,000
2021-05-04202103035748otc alterations permit887 28th Av$20,000
2020-12-08202012080442otc alterations permit88 Entrada Ct$80,000
2020-09-14202009144125otc alterations permit16 Entrada Ct$40,000
2020-07-22202007210596otc alterations permit1816 Lake St$1
2020-03-12202003126921otc alterations permit457 Tehama St$300,000
2020-01-30202001303098otc alterations permit60 Arguello Bl$30,000
2019-08-28201810243988otc alterations permit4238 23rd St$40,000
2019-08-16201908169023otc alterations permit1501 Beach St$30,000
2019-05-28201905281785otc alterations permit453 Douglass St$20,000
2019-05-28201905221375otc alterations permit6725 California St$65,000
2019-03-20201903205805otc alterations permit586 Duncan St$1
2019-03-20201903205804otc alterations permit233 Garfield St$1,500
2019-02-06201902062268otc alterations permit2645 Baker St$5,000
2019-02-06201902041962otc alterations permit3595 21st St$15,000
2018-09-13201809130093otc alterations permit2206 Pine St$50,000
2018-08-29201808238173otc alterations permit453 Douglass St$25,000
2018-08-23201808238124otc alterations permit876 43rd Av$20,000
2018-08-03M959947otc alterations permit745 Parnassus Av—
2018-07-18201807184832otc alterations permit1410 Innes Av$15,000
2018-07-18201807184831otc alterations permit876 43rd Av$25,000
2018-07-18201807184829otc alterations permit1 Daniel Burnham Ct$25,000
2018-06-01201806010792otc alterations permit2322 18th Av$60,000
2018-05-29201805239914otc alterations permit876 43rd Av$40,000
2018-02-15201802070672otc alterations permit1410 Innes Av$25,000
2018-01-23201801168631otc alterations permit65 Almaden Ct$270,000
2017-12-05201712055561otc alterations permit2828 Greenwich St$5,000
2017-11-03201708084225otc alterations permit586 Duncan St$80,000
2017-10-11201710060658otc alterations permit851 42nd Av$220,000
2017-10-04201710040330otc alterations permit20 Sherwood Ct$50,000
2017-10-04201710040333otc alterations permit1150 Lombard St$161,000
2017-09-11201709117635otc alterations permit238 Staples Av$55,000
2017-09-11201709117598otc alterations permit4430 24th St$65,000
2017-04-19201704194380otc alterations permit1816 Lake St$8,000
2016-12-19201612195341otc alterations permit1816 Lake St$85,000
2016-07-26201607263416otc alterations permit1501 Beach St$40,000
2016-05-05201412304694additions alterations or repairs2745 Octavia St$700,000
2016-05-02201605026246otc alterations permit1501 Beach St$75,000
2016-01-22201503312320otc alterations permit1927 Mcallister St$15,000
2016-01-21201601217640otc alterations permit48 Clarendon Av$130,000
2015-09-09201509096514otc alterations permit852 42nd Av$50,000
2015-08-07201508063470otc alterations permit2395 34th Av$64,800
2015-08-07201508063473otc alterations permit2395 34th Av$18,000
2015-03-09201503050015otc alterations permit848 42nd Av$50,000
2015-03-06201503060154otc alterations permit177 College Av$25,000
2015-02-20201502107866otc alterations permit1927 Mcallister St$75,000
2015-01-26201501266700otc alterations permit813 47th Av$20,000
2014-11-20201402037636additions alterations or repairs18 Moore Pl$250,000
2014-06-02201405276700otc alterations permit909 Central Av$15,000
2014-04-28201311131777otc alterations permit1451 Montgomery St$9,000
2014-03-27201403271859otc alterations permit2366 21st Av$25,000
2014-03-12201403120520otc alterations permit72 06th Av$25,000
2014-02-14201402128402otc alterations permit4375 23rd St$20,000
2013-12-30201305287959additions alterations or repairs1511 Clement St$25,000
2013-08-01201308013378otc alterations permit647 14th Av$1,000
2013-06-04201306048647otc alterations permit647 14th Av$1
2013-05-30201108112225additions alterations or repairs457 Tehama St$750,000
2013-02-13201302130156otc alterations permit420 Noe St$1
2012-07-31201207255734otc alterations permit4167 24th St$5,000
2012-03-23201203236759otc alterations permit496 38th Av$200,000
2011-10-24201110247429otc alterations permit420 Noe St$3,000
2011-06-20201106208499otc alterations permit647 14th Av$1
2010-11-29201011295717otc alterations permit7919 Geary Bl$20,000
2010-10-01201010012106otc alterations permit126 Springfield Dr$4,000
2010-09-13201009130768otc alterations permit66 Rico Wy$10,000
2010-08-13201008138714otc alterations permit4431 Irving St$2,700
2010-08-11201008118539otc alterations permit4431 Irving St$4,500
2010-01-08201001084442otc alterations permit446 28th Av$1
2010-01-08201001084444otc alterations permit446 28th Av$1
2009-04-22200904226878otc alterations permit465 Oak St$24,389
2008-12-29200812017500otc alterations permit1821 Lyon St$1
2008-12-29200812017501otc alterations permit1821 Lyon St$1
2008-12-29200812017502otc alterations permit1821 Lyon St$1
2007-07-06200311130080additions alterations or repairs496 38th Av$150,000
2006-09-08200609081773otc alterations permit444 Oak St$25,100
2005-04-25200504250789otc alterations permit1821 Lyon St$1
2005-02-09200502095147otc alterations permit753 Oak St$7,000
2004-11-09200411098845otc alterations permit4152 26th St$1
2004-11-09200411098843otc alterations permit130 Madrone Av$1
2004-09-21200409214753otc alterations permit65 Hartford St$1
2004-03-18200403188966otc alterations permit101 17th Av$500
2003-10-27200310278624otc alterations permit1033 York St$900
2003-05-19200305194955otc alterations permit960 Haight St$4,500
2003-01-15200301155240otc alterations permit1269 04th Av$15,000
2003-01-14200301145145otc alterations permit649 05th Av$2,000
2003-01-03200301034541otc alterations permit252 Collingwood St$3,000
2002-03-22200203222085otc alterations permit197 Guerrero St$600
2002-03-22200203222082otc alterations permit1511 Clement St$1
2002-03-22200203222084otc alterations permit550 45th Av$3,000
2001-08-16200108166221otc alterations permit550 45th Av$30,000
2001-06-04200106040640otc alterations permit550 45th Av$12,000
2001-02-22200102222716otc alterations permit120 Santa Monica Wy$8,000

Source: DataSF (Building Permits + Building Permits Contacts)

Source: DataSF, City and County of San Francisco (Building Permits; Building Permits Contacts).

Discipline, complaints & legal

No board discipline or complaints found in our current sources. Federal court search (CourtListener): no state-consistent possible match in our last sample run, or not yet run for this contractor.

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Reviews

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Duffin Construction · General Building Contractor
San Francisco, CA
License on file: CA ••••0636
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Sources for this report

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