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Engineer, San Francisco License C80734

Erwin O'toole

The city has issued 213 of the 235 San Francisco building permits that name Erwin O'toole since 2018. The work is mostly residential, led by home remodels. Their median plan-review permit for home remodels took 5.3 months from filing to issue, 40% faster than the citywide median. Their busiest neighborhoods are Mission, Marina and Pacific Heights.

Also filed as
architect, designer
Issued by the city
213 of 235 filed since 2018
Median plan-review time, home remodels
5.3 mo city median 8.9 mo
Rank for home remodels
No. 23 of 491 by home remodels issued
Overall rank
No. 30 of 1,146 engineers

What they work on

Every San Francisco building permit with Erwin O'toole on the record since 2018, by project type. Most filed: 129 home remodels, 65 apartments and multifamily, 12 home additions.

Residential and commercial, by permits filed

92% residential
9% commercial
Permits by project type, filed and issued
  1. Home remodels Residential 116 of 129 issued 55% of filings.
  2. Apartments and multifamily Residential 59 of 65 issued 28% of filings.
  3. Home additions Residential 11 of 12 issued 5% of filings.
  4. ADUs Residential 6 of 7 issued 3% of filings.
  5. Offices Commercial 7 of 7 issued 3% of filings.
  6. Hotels, clinics, schools and other commercial Commercial 7 of 7 issued 3% of filings.
  7. Retail and shops Commercial 2 of 3 issued 1% of filings.
  8. Restaurants and bars Commercial 3 of 3 issued 1% of filings.
  9. New homes Residential 2 of 2 issued 1% of filings.

Permits over time

Permits filed each year, drawn as a street with one building per year, and how many of all their permits the city has issued.

Busiest year
2025
57 permits filed
Latest filing
Oct 2026
91% of 235 issued
Permits filed per year: 2018: 17, 2019: 36, 2020: 12, 2021: 13, 2022: 20, 2023: 14, 2024: 22, 2025: 57, 2026: 44. The 2026 figure runs through October 20, 2026.

One building per year, its height the permits filed. Each floor line marks 10 permits; the 2026 building is dashed because it counts permits filed through October 20, 2026.

Issued by the city: 213 of 235 permits filed

91%

All San Francisco project permits since 2018 in this data

93% issued

22 not issued as of October 20, 2026. Source: SF Department of Building Inspection permits via DataSF.

How fast their permits come through

Filing to issue for permits that went through plan review. Erwin O'toole has 55 of those across all project types; the citywide comparison is for home remodels, their most filed type, where 3,361 of 93,498 permits went through plan review and the rest were approved over the counter.

Erwin O'toole, home remodels

5.3months

That is 40% faster than the citywide median for home remodels.

Median months from filing to issue for plan-review permits. Erwin O'toole, home remodels: 5.3 months. San Francisco, home remodels: 8.9 months. Middle half of city permits: 5.0 to 15.6 months.
5.3 months for home remodels, faster than 81 of 93 other engineers ranked for home remodels that have a median for it Each circle is a firm's median for its plan-review permits for home remodels. Dashed line: the median of all San Francisco plan-review permits for home remodels, 8.9 months. Shaded: the middle half of those permits, 5.0 to 15.6 months.
0 3 6 9 12 15 18+ months Ecr Engineering: 13.8 months Double D Engineering: 9.8 months Hom & Pisano Engineering Inc.: 6.8 months Enertia Designs: 9.8 months Lawrence Liao Str. Eng: 6.5 months Atrium Structural Engineer: 5.8 months Ice Design Inc.: 11.0 months Kevin O'connor Inc.: 6.7 months Altos Engineering: 14.8 months Innovative Const: 15.5 months Rs Engineering: 14.1 months Design Everest Consulting: 8.1 months Semco Engineering Inc.: 6.8 months Base Design: 8.6 months Jingbo Yang: 7.8 months Design Consultants Group, Inc: 11.1 months Zfa Structural Engineers: 7.1 months Doug Lee: 9.0 months One Design: 12.6 months Yuflux Engineering Llc.: 8.3 months Horn Lee: 8.2 months Ftf Engineering Inc.: 6.9 months Inncon Design: 18.0 months Mercury Engineering Group: 18.5 months Ashley & Vance Engineering: 6.7 months Dwong Engineering Inc.: 10.9 months Himmati Engineering Inc.: 6.0 months Strandberg Engineering: 9.0 months Holmes Culley: 5.8 months Sia Consulting Corp: 15.9 months Ny Engineering Consulting: 9.4 months William Liang: 3.7 months Gfds Engineers: 5.7 months Q Architecture: 14.7 months L Wong Engineering: 8.8 months Framework Engineering: 6.3 months A & J Design Associates Inc.: 6.9 months Gregory Paul Wallace Struct: 14.0 months Massoudi Consulting Engineer: 8.4 months Ca Voong: 6.4 months Hcg Associates, Inc.: 9.0 months Mosswood Engineering: 11.1 months Puns And Assoc: 10.3 months Jian Huang: 9.2 months Az Design & Engineering Inc: 16.0 months Wmstructural: 8.4 months Julia Y. Chen Design Inc.: 18.1 months Bkg Structural Engineers: 4.2 months Pat Buscovich: 7.4 months Michael Metiu Design Studio: 6.2 months Harrell Kane S.E. Inc.: 10.0 months David Yadegar, Pe: 5.0 months Thomas Podesta Engineer: 10.9 months Exforma Design: 11.4 months Lx Engineering: 8.8 months Jon Brody Structural Engineers: 6.8 months Dolmen Structural Engineer: 4.8 months Duane Tran: 8.6 months Ekw Engineering: 9.7 months Tsa Structural Engineers: 12.5 months Integrand Structural Engineer: 10.3 months Kris Johnson: 5.2 months Meece Engineering Inc.: 7.3 months Eas Designers: 4.4 months Benjamin Lai & Associates: 13.7 months Halterman Engineering: 3.1 months Ma Engineering: 8.9 months Patrick Donato: 9.4 months Murphy Burr Curry Inc.: 6.2 months W.H. Consultant Inc.: 7.0 months Ladc Engineering Inc: 4.9 months Bahman Ghassenmzadeh: 11.9 months Duquette Engineering: 8.5 months Seri Ngerwattana, Pe: 7.4 months Smithworks Engineering: 7.6 months Holmes: 4.5 months Tangobuilder: 7.1 months Hahbach-Lewin Inc: 10.8 months Lea & Braze Engineering, Inc: 5.3 months Powell And Associates: 5.9 months Double D Enginneering, Inc: 13.6 months W.H.Yang Structural Engr: 9.2 months St Onge & Assoc.: 7.1 months Pivot: 15.6 months Townsend Brown: 15.6 months Monterey Energy Group: 5.4 months Emc2 Structural Design Inc.: 15.3 months Qi Structural Engineering: 10.6 months Spi Consulting Engineers, Inc.: 4.0 months Prostruct Engineering: 20.8 months Dago De La Rosa: 7.2 months Engineering 350: 6.2 months Romig Engineers: 1.9 months Erwin O'toole 0 3 6 9 12 15 18+ months Ecr Engineering: 13.8 months Double D Engineering: 9.8 months Hom & Pisano Engineering Inc.: 6.8 months Enertia Designs: 9.8 months Lawrence Liao Str. Eng: 6.5 months Atrium Structural Engineer: 5.8 months Ice Design Inc.: 11.0 months Kevin O'connor Inc.: 6.7 months Altos Engineering: 14.8 months Innovative Const: 15.5 months Rs Engineering: 14.1 months Design Everest Consulting: 8.1 months Semco Engineering Inc.: 6.8 months Base Design: 8.6 months Jingbo Yang: 7.8 months Design Consultants Group, Inc: 11.1 months Zfa Structural Engineers: 7.1 months Doug Lee: 9.0 months One Design: 12.6 months Yuflux Engineering Llc.: 8.3 months Horn Lee: 8.2 months Ftf Engineering Inc.: 6.9 months Inncon Design: 18.0 months Mercury Engineering Group: 18.5 months Ashley & Vance Engineering: 6.7 months Dwong Engineering Inc.: 10.9 months Himmati Engineering Inc.: 6.0 months Strandberg Engineering: 9.0 months Holmes Culley: 5.8 months Sia Consulting Corp: 15.9 months Ny Engineering Consulting: 9.4 months William Liang: 3.7 months Gfds Engineers: 5.7 months Q Architecture: 14.7 months L Wong Engineering: 8.8 months Framework Engineering: 6.3 months A & J Design Associates Inc.: 6.9 months Gregory Paul Wallace Struct: 14.0 months Massoudi Consulting Engineer: 8.4 months Ca Voong: 6.4 months Hcg Associates, Inc.: 9.0 months Mosswood Engineering: 11.1 months Puns And Assoc: 10.3 months Jian Huang: 9.2 months Az Design & Engineering Inc: 16.0 months Wmstructural: 8.4 months Julia Y. Chen Design Inc.: 18.1 months Bkg Structural Engineers: 4.2 months Pat Buscovich: 7.4 months Michael Metiu Design Studio: 6.2 months Harrell Kane S.E. Inc.: 10.0 months David Yadegar, Pe: 5.0 months Thomas Podesta Engineer: 10.9 months Exforma Design: 11.4 months Lx Engineering: 8.8 months Jon Brody Structural Engineers: 6.8 months Dolmen Structural Engineer: 4.8 months Duane Tran: 8.6 months Ekw Engineering: 9.7 months Tsa Structural Engineers: 12.5 months Integrand Structural Engineer: 10.3 months Kris Johnson: 5.2 months Meece Engineering Inc.: 7.3 months Eas Designers: 4.4 months Benjamin Lai & Associates: 13.7 months Halterman Engineering: 3.1 months Ma Engineering: 8.9 months Patrick Donato: 9.4 months Murphy Burr Curry Inc.: 6.2 months W.H. Consultant Inc.: 7.0 months Ladc Engineering Inc: 4.9 months Bahman Ghassenmzadeh: 11.9 months Duquette Engineering: 8.5 months Seri Ngerwattana, Pe: 7.4 months Smithworks Engineering: 7.6 months Holmes: 4.5 months Tangobuilder: 7.1 months Hahbach-Lewin Inc: 10.8 months Lea & Braze Engineering, Inc: 5.3 months Powell And Associates: 5.9 months Double D Enginneering, Inc: 13.6 months W.H.Yang Structural Engr: 9.2 months St Onge & Assoc.: 7.1 months Pivot: 15.6 months Townsend Brown: 15.6 months Monterey Energy Group: 5.4 months Emc2 Structural Design Inc.: 15.3 months Qi Structural Engineering: 10.6 months Spi Consulting Engineers, Inc.: 4.0 months Prostruct Engineering: 20.8 months Dago De La Rosa: 7.2 months Engineering 350: 6.2 months Romig Engineers: 1.9 months Erwin O'toole

4 firms with medians over 18 months are drawn at the right edge.

Where they rank

Ranked by permits the city has issued since 2018, first across every project type, then for home remodels alone.

  1. 28 Yuflux Engineering Llc. 219
  2. 29 Tim O'sullivan Structural Eng 216
  3. 30 Erwin O'toole 213
  4. 31 Levi Abarte 208
  5. 32 Doug Lee 205

All permits issued, 1,146 engineers Full ranking

  1. 21 Yuflux Engineering Llc. 126
  2. 22 Horn Lee 126
  3. 23 Erwin O'toole 116
  4. 24 Ftf Engineering Inc. 107
  5. 25 Inncon Design 106

Home remodels issued, 491 engineers

Where they work

The neighborhoods where Erwin O'toole files the most permits, and how many engineers count each one among their top 4 neighborhoods.

  1. 01 Mission 298 engineers count Mission among their busiest neighborhoods
  2. 02 Marina 102 engineers count Marina among their busiest neighborhoods
  3. 03 Pacific Heights 123 engineers count Pacific Heights among their busiest neighborhoods
  4. 04 Potrero Hill 93 engineers count Potrero Hill among their busiest neighborhoods

Questions for the first call

  1. Which of your recent San Francisco permits are closest to my project in type, size and neighborhood, and can I see the permit numbers?
  2. How long did those permits take from filing to issue, and what did plan check send back?
  3. Who on your team draws the set, who stamps it, and who answers the city's comments?

Other engineers for home remodels

Firms ranked near Erwin O'toole by permits issued for home remodels.

  1. 20 One Design 135 home remodels issued · 12.6 mo median for home remodels
  2. 21 Yuflux Engineering Llc. 126 home remodels issued · 8.3 mo median for home remodels
  3. 22 Horn Lee 126 home remodels issued · 8.2 mo median for home remodels
  4. 24 Ftf Engineering Inc. 107 home remodels issued · 6.9 mo median for home remodels
  5. 25 Inncon Design 106 home remodels issued · 18.0 mo median for home remodels
  6. 26 Mercury Engineering Group 103 home remodels issued · 18.5 mo median for home remodels
Sheet
S-030 No. 30 of 1,146
Drawing
Permit record, Erwin O'toole
Engineer, San Francisco
License
C80734 check with BPELSG
Data as of
Oct 2026
Scale
Not to scale

Built only from public San Francisco Department of Building Inspection records (permits, permit contacts), updated 2026-10-20. It is not a review or an endorsement, and Erwin O'toole has not paid to be listed. Project addresses are never shown.

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