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Contractor, San Francisco License 850407

Sf Twin Boys Corp. Dba Master Builders

The city has issued 53 of the 57 San Francisco building permits that name Sf Twin Boys Corp. Dba Master Builders since 2018. The work is mostly residential, led by apartments and multifamily. Their median plan-review permit, across all project types, took 7.6 months from filing to issue. Their busiest neighborhoods are North Beach, Russian Hill and Chinatown.

Issued by the city
53 of 57 filed since 2018
Median plan-review time, all types
7.6 mo filing to issue
Rank for apartments and multifamily
No. 116 of 221 by apartments and multifamily issued
Overall rank
No. 213 of 226 contractors

What they work on

Every San Francisco building permit with Sf Twin Boys Corp. Dba Master Builders on the record since 2018, by project type. Most filed: 23 apartments and multifamily, 21 home remodels, 7 offices.

Residential and commercial, by permits filed

83% residential
18% commercial
Permits by project type, filed and issued
  1. Apartments and multifamily Residential 21 of 23 issued 40% of filings.
  2. Home remodels Residential 19 of 21 issued 37% of filings.
  3. Offices Commercial 7 of 7 issued 12% of filings.
  4. ADUs Residential 3 of 3 issued 5% of filings.
  5. Hotels, clinics, schools and other commercial Commercial 2 of 2 issued 4% of filings.
  6. Restaurants and bars Commercial 1 of 1 issued 2% 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
2022
16 permits filed
Latest filing
Apr 2026
93% of 57 issued
Permits filed per year: 2018: 11, 2019: 8, 2020: 3, 2021: 9, 2022: 16, 2023: 2, 2024: 1, 2025: 4, 2026: 3. The 2026 figure runs through October 20, 2026.

One building per year, its height the permits filed. Each floor line marks 2 permits; the 2026 building is dashed because it counts permits filed through October 20, 2026.

Issued by the city: 53 of 57 permits filed

93%

All San Francisco project permits since 2018 in this data

93% issued

4 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. Sf Twin Boys Corp. Dba Master Builders has 6 of those across all project types; the citywide comparison is for apartments and multifamily, their most filed type, where 3,633 of 59,927 permits went through plan review and the rest were approved over the counter.

Sf Twin Boys Corp. Dba Master Builders, all project types

7.6months

Median months from filing to issue for plan-review permits. Sf Twin Boys Corp. Dba Master Builders, all project types: 7.6 months. San Francisco, apartments and multifamily: 6.2 months. Middle half of city permits: 2.7 to 12.3 months.
72 other contractors ranked for apartments and multifamily have a median for it; Sf Twin Boys Corp. Dba Master Builders has fewer than 3 issued plan-review permits for apartments and multifamily with usable dates Each circle is a firm's median for its plan-review permits for apartments and multifamily. Dashed line: the median of all San Francisco plan-review permits for apartments and multifamily, 6.2 months. Shaded: the middle half of those permits, 2.7 to 12.3 months.
0 3 6 9 12 15 18 21+ months Axel8 Construction: 13.6 months Sure, Inc.: 9.0 months Ps2 Inc: 5.4 months Halyard Inc: 5.7 months Sft Construction Corp: 5.4 months U S Prime Contractor Inc: 2.8 months S F Garage Company Inc.: 4.0 months Cahill Contractors Llc.: 4.1 months Saarman Construction,Ltd.: 7.8 months Magnum Construction Group Inc: 3.8 months De Brus Construction Inc: 16.3 months Nibbi Bros Assoc Inc.: 5.2 months Level 10 Construction Lp: 3.0 months Aguilera Construction Company: 18.5 months Amone Corp: 7.0 months Sabah International Incorporated: 1.8 months Block 12 Construction: 13.4 months Swinerton Builders: 3.2 months A J O Group Build Inc: 33.6 months Convergint Technologies Llc: 5.8 months Doherty Restoration, Inc.: 29.3 months Nabi Construction & Engineering Inc: 11.2 months Centric Construction Inc: 7.8 months Reliable Construction Inc: 10.0 months Pineda Construction Inc: 10.2 months Landmark Construction Inc.: 2.8 months Build Group Inc.: 3.4 months D.F.P.F Corp Dba Fine Line Construction: 5.1 months Velox Construction Inc/Velox Des & Const: 7.0 months John O'donovan: 17.9 months Mulhall Construction Inc.: 14.0 months Achill Beg Construction Inc: 5.6 months Plant Construction Co, Lp: 8.1 months Pacific Engineering & Construction Inc.: 43.4 months Hathaway Dinwiddie Co.: 7.1 months Rei Build Up Construction Corp: 15.2 months Webcor Construction Lp: 3.6 months Recon 360 Llc: 3.6 months Guzman Construction Group Inc.: 6.7 months L H Construction: 14.0 months Mastec Network Solutions Inc: 6.7 months Ward-Tek Inc.: 13.1 months Cookline Construction Inc: 5.5 months Trim Fit Constr. - O'reilly Engineering: 6.8 months Bobcomm Llc Dba Pacific Das Llc.: 3.0 months Bryan J. Valverde Co: 8.0 months Granite Excavation & Demolition Inc: 4.8 months Cbs Construction Inc.: 5.0 months Sandbank Construction, Inc: 5.5 months Wickman Development And Construction: 13.4 months Pribuss Engineering Inc: 3.7 months Area Development Inc.: 24.8 months Qse Construction: 7.7 months Thorpe Design Inc: 3.6 months Dajani Construction: 31.7 months K 2 Builders Inc: 21.8 months Terra Nova Industries: 6.3 months Turner Construction Co: 6.5 months G B U Construction Development: 14.4 months Citidev Inc.: 15.2 months The Toboni Group: 5.0 months Bevilacqua & Sons: 13.9 months C B 2 Builders Incorporated: 14.7 months Flmc Development Corp Dba Adamo Campagna: 11.4 months Winder Construction Inc.: 10.6 months Clear Channel Outdoor Llc: 2.2 months Charles Pankow Builders Ltd: 2.0 months Eastwood Development Incorporated: 13.3 months Thompson Suskind L P: 7.6 months Narrowback Construction Co.: 24.1 months Singular Builders: 2.5 months Truebeck Construction: 6.3 months 0 3 6 9 12 15 18 21+ months Axel8 Construction: 13.6 months Sure, Inc.: 9.0 months Ps2 Inc: 5.4 months Halyard Inc: 5.7 months Sft Construction Corp: 5.4 months U S Prime Contractor Inc: 2.8 months S F Garage Company Inc.: 4.0 months Cahill Contractors Llc.: 4.1 months Saarman Construction,Ltd.: 7.8 months Magnum Construction Group Inc: 3.8 months De Brus Construction Inc: 16.3 months Nibbi Bros Assoc Inc.: 5.2 months Level 10 Construction Lp: 3.0 months Aguilera Construction Company: 18.5 months Amone Corp: 7.0 months Sabah International Incorporated: 1.8 months Block 12 Construction: 13.4 months Swinerton Builders: 3.2 months A J O Group Build Inc: 33.6 months Convergint Technologies Llc: 5.8 months Doherty Restoration, Inc.: 29.3 months Nabi Construction & Engineering Inc: 11.2 months Centric Construction Inc: 7.8 months Reliable Construction Inc: 10.0 months Pineda Construction Inc: 10.2 months Landmark Construction Inc.: 2.8 months Build Group Inc.: 3.4 months D.F.P.F Corp Dba Fine Line Construction: 5.1 months Velox Construction Inc/Velox Des & Const: 7.0 months John O'donovan: 17.9 months Mulhall Construction Inc.: 14.0 months Achill Beg Construction Inc: 5.6 months Plant Construction Co, Lp: 8.1 months Pacific Engineering & Construction Inc.: 43.4 months Hathaway Dinwiddie Co.: 7.1 months Rei Build Up Construction Corp: 15.2 months Webcor Construction Lp: 3.6 months Recon 360 Llc: 3.6 months Guzman Construction Group Inc.: 6.7 months L H Construction: 14.0 months Mastec Network Solutions Inc: 6.7 months Ward-Tek Inc.: 13.1 months Cookline Construction Inc: 5.5 months Trim Fit Constr. - O'reilly Engineering: 6.8 months Bobcomm Llc Dba Pacific Das Llc.: 3.0 months Bryan J. Valverde Co: 8.0 months Granite Excavation & Demolition Inc: 4.8 months Cbs Construction Inc.: 5.0 months Sandbank Construction, Inc: 5.5 months Wickman Development And Construction: 13.4 months Pribuss Engineering Inc: 3.7 months Area Development Inc.: 24.8 months Qse Construction: 7.7 months Thorpe Design Inc: 3.6 months Dajani Construction: 31.7 months K 2 Builders Inc: 21.8 months Terra Nova Industries: 6.3 months Turner Construction Co: 6.5 months G B U Construction Development: 14.4 months Citidev Inc.: 15.2 months The Toboni Group: 5.0 months Bevilacqua & Sons: 13.9 months C B 2 Builders Incorporated: 14.7 months Flmc Development Corp Dba Adamo Campagna: 11.4 months Winder Construction Inc.: 10.6 months Clear Channel Outdoor Llc: 2.2 months Charles Pankow Builders Ltd: 2.0 months Eastwood Development Incorporated: 13.3 months Thompson Suskind L P: 7.6 months Narrowback Construction Co.: 24.1 months Singular Builders: 2.5 months Truebeck Construction: 6.3 months

7 firms with medians over 21 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 apartments and multifamily alone.

  1. 211 Kilrea Construction Inc. 54
  2. 212 Bryan J. Valverde Co 53
  3. 213 Sf Twin Boys Corp. Dba Master Builders 53
  4. 214 Ace Drilling & Excavation 53
  5. 215 Narrowback Construction Co. 53

All permits issued, 226 contractors Full ranking

  1. 114 Beyond The Horizon Construction 21
  2. 115 Curran & Associates General Contractors 21
  3. 116 Sf Twin Boys Corp. Dba Master Builders 21
  4. 117 Field Construction Inc. 20
  5. 118 Itu Construction 20

Apartments and multifamily issued, 221 contractors

Where they work

The neighborhoods where Sf Twin Boys Corp. Dba Master Builders files the most permits, and how many contractors count each one among their top 4 neighborhoods.

  1. 01 North Beach 16 contractors count North Beach among their busiest neighborhoods
  2. 02 Russian Hill 30 contractors count Russian Hill among their busiest neighborhoods
  3. 03 Chinatown 27 contractors count Chinatown among their busiest neighborhoods
  4. 04 Noe Valley 55 contractors count Noe Valley 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 contractors for apartments and multifamily

Firms ranked near Sf Twin Boys Corp. Dba Master Builders by permits issued for apartments and multifamily.

  1. 113 Bevilacqua & Sons 21 apartments and multifamily issued · 13.9 mo median for apartments and multifamily
  2. 114 Beyond The Horizon Construction 21 apartments and multifamily issued
  3. 115 Curran & Associates General Contractors 21 apartments and multifamily issued
  4. 117 Field Construction Inc. 20 apartments and multifamily issued
  5. 118 Itu Construction 20 apartments and multifamily issued
  6. 119 Aurora Builders 20 apartments and multifamily issued
Sheet
C-213 No. 213 of 226
Drawing
Permit record, Sf Twin Boys Corp. Dba Master Builders
Contractor, San Francisco
License
850407 check with CSLB
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 Sf Twin Boys Corp. Dba Master Builders has not paid to be listed. Project addresses are never shown.

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