| Imran A Y Construction Inc | A, B | 2017 | Active |
| Inspired Environments LLC | B2 | 2022 | Active |
| Integrity Construction Partners LLC | B | 2024 | Active |
| J A C Construction Inc | B | 2004 | Active |
| J Chavez General Contractor Inc | B | 2020 | Active |
| J W Rigney Construction Inc | A, B + C10 | 1990 | Active |
| Jam Construction Inc | B | 1994 | Active |
| Jireh Contractor Inc | B | 2025 | Active |
| Jmag Construction Services Inc | B | 2004 | Active |
| Jr Solutions Inc | B | 2018 | Active |
| Jungsten Construction | B | 1988 | Renew by Nov 30, 2026 |
| K R W Construction Inc | B | 2002 | Active |
| Kelly D & Sons Construction Inc | B | 2014 | Active |
| Kelly Pacific Construction Co | B | 1977 | Active |
| Ken Cooper Roofing & Gutter Systems Inc | B + C39, C43 | 1982 | Active |
| Kerr Construction Incorporated | B | 1991 | Active |
| Kokalis Construction Inc | B | 2013 | Active |
| L&L General Construction Inc | B | 2025 | Active |
| Lamperti Contracting & Design Inc | B | 1990 | Active |
| Lawrence Matthew Construction Inc | B | 1979 | Active |
| LH Gao Construction Inc | B | 2000 | Active |
| Lima Construction And Tile Inc | B | 2010 | Active |
| Linscott Engineering Contractors Inc | A | 1985 | Active |
| Lombardi Property Development LLC | B | 2021 | Active |
| Lookinland Custom Building LLC | B | 2022 | Active |
| Lost Boys Construction Corp | B | 2023 | Active |
| Maggiora And Ghilotti Inc | A, B + C8, C12, C21 +3 | 1964 | Active |
| Marin County Roofing Co Inc | B + C39 | 1969 | Active |
| Marin Fencing Inc | B + C13, D28 | 2012 | Active |
| Marin H20 Inc | A, B + C36, C55 | 2004 | Active |
| Marin Mechanical II Inc | A, B + C4, C36, C46 | 1998 | Active |
| Marinkitchenco Inc | B | 2016 | Active |
| Marvin Construction Inc | B | 2026 | Active |
| Mason Dave Building Inc | B | 2005 | Active |
| Masterbuild Works LLC | B | 2025 | Active |
| Matson Construction Management | B | 2021 | Active |
| Max Electric | A, B + C10, C36 | 2025 | Active |
| Maza Bro's Construction Corp | B | 2025 | Active |
| MC Carthy Painting Inc | B + C33 | 1971 | Active |
| MC Phail J W MC Phail Construction Inc | B | 1993 | Active |
| McCowan Berrones & Company LLC | B | 2021 | Active |
| McKeon Finish Carpentry Inc | B | 2006 | Active |
| MCL General Contractor Inc | B | 2024 | Active |
| Meadows Green Building And Design Inc | B | 2004 | Active |
| Merz Bros Construction Inc | A, B + C8, D49 | 2018 | Active |
| Meylan Construction Inc | B | 1993 | Active |
| MGP Builder Inc | B | 2022 | Active |
| Millsap Degnan & Associates Inc | A, B | 2000 | Active |
| Millwood Construction Inc | B | 2025 | Active |
| Modern Design Build | B + C27 | 2019 | Active |
| Morales 502 Construction Inc | B | 2026 | Active |
| Mr Skylight | B | 1978 | Active |
| Muldoon Construction Inc | B | 2015 | Active |
| Murphy Construction LLC | B | 2021 | Active |
| Myers-Ghilotti Bros JV | A | 2021 | Active |
| Nica Construction Inc | B + C10, C36 | 2018 | Active |
| Nickels Golf Group Limited | A | 1996 | Active |
| Nima Construction Company | B | 1998 | Active |
| Nolan Construction Inc | B | 2007 | Active |
| Norman Charles Construction Inc | B | 1985 | Active |
| North Coast Restoration LTD | B | 2002 | Active |
| Northbay Home Solutions | B | 2020 | Active |
| Norwood Construction Inc | B | 2014 | Active |
| Nute Construction LLC | B + C10 | 2002 | Active |
| O Mike's Construction Company Inc | B + C2, C9 | 2000 | Active |
| O'Neill & Neville Construction Inc | B + C10 | 2007 | Active |
| O'Neill Construction Inc | B | 1995 | Active |
| One - Stop Construction Group Inc | B + C35 | 2008 | Active |
| One Stop Plastering Inc | B + C35 | 2012 | Active |
| Orihuela General Contractor Inc | B | 2022 | Active |
| Ov Construction Services Inc | B | 2025 | Active |
| Pac West Painting Inc | B + C33 | 2004 | Active |
| Pacific Edge Construction Inc | B | 2013 | Active |
| Partners Contracting Inc | A, B | 1994 | Active |
| Pederson Construction Inc | B | 2018 | Active |
| Pierce & Son's Construction | B2 | 2024 | Active |
| Plath & Company Inc | B | 1980 | Active |
| PLG Construction Inc | B + C27, C33 | 2024 | Active |
| Premier Home Care | B | 2024 | Active |
| Prime Stone Build | B | 2026 | Active |
| Puroclean Of San Rafael | B2 | 2024 | Active |
| Quigley's Construction Inc | B + C8 | 1997 | Active |
| R W R Construction Inc | A, B + C57 | 1988 | Active |
| Radco & Associates Inc | A, B | 1981 | Active |
| Rake Electric | B + C10 | 2004 | Active |
| Redhorse Constructors Inc | B | 1989 | Active |
| Resilient Marin Construction | B | 2026 | Active |
| Reyes Landscape Construction | B + C27 | 2017 | Active |
| Rise Drilling Inc | A + D09 | 2021 | Active |
| Robbins Trevor D Co Inc | B | 1995 | Active |
| Robinson Renovations | B | 2013 | Active |
| Rockwood Commercial Builders LLC | B | 2024 | Active |
| Rodas Brothers Engineering Construction | A, B | 2021 | Active |
| Rodas L. Construction Inc | B | 2025 | Active |
| Roots Construction Co Inc | B | 1978 | Active |
| Safe Grounds Construction Inc | B + C27, C49 | 2025 | Active |
| San Rafael Rock Quarry Inc | A + C10, HAZ | 1994 | Active |
| Saunders W B Construction Inc | B | 1982 | Active |
| Sausalito Construction Inc | B | 2004 | Active |
| Say Builders Inc | B | 2024 | Active |