| J & E Engineering And Construction | A, B | 2019 | Active |
| J & G Precision Excavation | A | 2026 | Active |
| J & M Leyva General Engineering | A + C33 | 2016 | Active |
| J & N Crabtree Enterprises Inc | B | 2025 | Active |
| J & O Remodeling | B2 | 2024 | Active |
| J B C Design & Build Co | A, B + C8, C27 | 2013 | Active |
| J C F Construction Co Inc | B + C8 | 2006 | Active |
| J Francis Company | A, B + C2, C8, C33 +4 | 1990 | Active |
| J H Construction | B | 2015 | Active |
| J Mark Enterprises Inc | B | 2021 | Active |
| J R General Construction Company | B | 2025 | Active |
| J V J Construction Service | A | 2015 | Active |
| J&J's General Construction Corp | B | 2025 | Active |
| Jacobs/Pcl A SF Joint Venture | A, B | 2026 | Active |
| JDB Builders Inc | B + C8 | 2021 | Active |
| Jgar Construction | B | 2026 | Active |
| JJ Builders Ca | B | 2026 | Active |
| Jj&M Builders Inc | B | 2020 | Active |
| JJC Project Management Group Inc | B + C8, C10 | 2003 | Active |
| JLS General Construction Inc | B | 2025 | Active |
| K & Bath Renovations Inc | B | 2021 | Active |
| K G E L Steel Inc | B + C10, C51 | 2017 | Active |
| Kana Development Group Inc | A + HAZ | 2021 | Active |
| Kana Pipeline Inc | A + HAZ | 1984 | Active |
| Kana Subsurface Engineering | A + C10 | 2015 | Active |
| Kassel Contracting Incorporated | A | 2003 | Active |
| KB Climate Services Inc | B + C20 | 2025 | Active |
| Kenmex Engineering Inc | A | 2024 | Active |
| Kincaid Development Inc | B | 1981 | Active |
| Kirby L P Excavation Inc | A | 2007 | Active |
| Kirchner Construction Inc | A | 2024 | Active |
| Kirmina Construction | B | 2025 | Active |
| Kitchen Masters Construction Services Inc | B | 2021 | Active |
| Kngdm Builders LLC | B | 2026 | Active |
| KSK Builders | B | 2022 | Active |
| L A One Corp | B + C10 | 2018 | Renew by Nov 30, 2026 |
| L Diamond Construction | B | 2024 | Active |
| La Casa Bella Design Inc | B | 2009 | Active |
| La Roca Construction Inc | B + C35 | 2026 | Active |
| Lamwood Seating Products Inc | B | 2015 | Active |
| Lartek Construction | B | 2022 | Active |
| LBD 1 Construction Corp | B | 2015 | Active |
| Legacy General Engineering Incorporated | A | 2024 | Active |
| Life Saver Safety Systems | B | 2025 | Active |
| Light Energy Inc | B + C10, C39 | 2020 | Active |
| Lightning Construction Inc | B | 2025 | Active |
| Lira's Prestige Companies Incorporated | B + C15, D63 | 2002 | Active |
| Liscio Development Inc | B | 1991 | Active |
| Loc Building Company Inc | B | 2026 | Active |
| Logan Construction | B + C27 | 2015 | Active |
| Los Makitas Builders | B | 2020 | Active |
| Luna's General Contractors | B | 2024 | Active |
| Luxe Contractors Corp | B | 2022 | Active |
| Luxury Home Redezigns | B | 2019 | Active |
| M & S Equipment Inc | A + C10, C34, C36 | 1989 | Active |
| M C Walk-Ins Inc | B | 2019 | Active |
| M D T Inc | B | 2019 | Active |
| M E A Construction Inc | B | 2015 | Active |
| M G B Construction Inc | A, B + C8, C12, C32 | 2001 | Active |
| M M C Hernandez | B + C8, C12 | 2003 | Active |
| M N S Builders LLC | B | 2018 | Active |
| M S G Construction Inc | B | 2018 | Active |
| M S Innovative Construction Corp | B | 2017 | Active |
| M Z Scaffold & Construction Inc | B + C35, D39 | 2008 | Active |
| Magana Construction Group | B | 2022 | Active |
| Magnon Companies The | B | 1980 | Active |
| Malier Contractors Inc | A, B + C8 | 1992 | Active |
| Masonry Solutions | B + C29 | 1992 | Active |
| Master Restoration & Construction Inc | B | 2019 | Active |
| Masters Electric | B + C7, C10, C46 | 1999 | Active |
| Mav Construction Inc | B + C36, C39 | 2021 | Active |
| Mayan Renovation Group Inc | B | 2019 | Active |
| Mayo's General Construction | B | 2018 | Active |
| MC Kinney Construction Company Inc | A | 1983 | Active |
| MC Minn James Inc | A | 2006 | Active |
| McLain And Sons Incorporated | B | 1988 | Active |
| McMinn Equipment Rental & Leasing Inc | A | 2005 | Active |
| Medina Builders | B | 2023 | Active |
| Mep Construction Services | A, B | 2017 | Active |
| MGK Remodeling | B2 | 2026 | Active |
| MGL Tech Construction Inc | B | 2023 | Active |
| MH General Construction Inc | B | 2023 | Active |
| Middle Housing Construction | B | 2023 | Active |
| Milato Construction Inc | B | 2008 | Active |
| Miller Blades Inc | A | 1983 | Active |
| Miracle Method Of Riverside | B + D12 | 2017 | Active |
| Mission Building Specialties Inc | B | 2021 | Active |
| Mitchell Construction & Development Inc | B | 1984 | Renew by Nov 30, 2026 |
| Modern Construction Services | B + C20 | 1983 | Active |
| Moisin Group Inc | B + ASB, C36 | 2015 | Active |
| Mojica Royal Construction Inc | B | 2024 | Active |
| Montoyas Construction | B | 2020 | Renew by Oct 31, 2026 |
| MPB Restorations | B | 2026 | Active |
| Munoz Enterprises, Inc. | B, B2 + C21 | 2015 | Active |
| My Home Enterprise Inc | B | 2026 | Active |
| Nangies Construction LLC | B | 2025 | Active |
| Nationwide Surveying Inc | B | 2014 | Active |
| Neal D J Construction Inc | B + C10 | 1995 | Active |
| Neighborhood Service Restoration LLC | B | 2023 | Active |
| Netgain Networks Inc | B + C7, C10 | 2008 | Active |