For businesses looking for the ideal location, California provides unmatched commercial benefits. To strengthen any office’s corporate mission, this state provides a critical mass of intellectual resources, financial savviness, business services, transportation infrastructure, and market access. Because of these distinctive assets, California is among the most profitable and effective places to conduct business in the world.

A well-designed workspace promotes a calmer, more productive environment. To function at their best, employees need to feel relaxed and at ease in their physical work environments. Therefore, offices looking for improvements or new designs should look no further than this list of the best office contractors in California. Each company on this list has completed a number of notable projects that showcase its impressive skills and services, and several of these firms are also recipients of notable awards and recognitions. 

Devcon Construction, Inc.

690 Gibraltar Dr. Milpitas, CA 95035

Since its establishment in 1976, Devcon Construction, Inc. has met the demands of every project by utilizing its general contracting expertise and design-build capabilities. This veteran-owned business has had a sizable regional presence in the West for most of the last two decades, having won a total of 154 awards and having completed more than 300 LEED-certified projects. In 2021, the firm was recognized among Engineering News-Record (ENR)’s Top 400 Contractors, and in the same year, it received awards from Silicon Valley Business Journal  for Deal of the Year,  Speculative Project, and Education Project.

Located on a 200,000-square-foot area, the 1212 Bordeaux is a 100,000-square-foot project that consists of a two-story steel structure. The project, completed by Devcon Construction, includes a mezzanine level above the second floor and a steel framework that is exposed and unpainted. This steel framework supports large amounts of column-free space. The vast open workstation has five sawtooth clerestories that are supported by Vierendeel trusses and offer expansive views of the sky and daylight. Exterior adjustable blinds shield large perimeter windows, allowing for responsive management of heat gain and daylight entry throughout the building. This project won numerous awards, including the 2020 AIA Honor Award for Architecture. 

Millie and Severson General Contractors

3601 Serpentine Dr. Los Alamitos, CA 90720

Millie and Severson General Contractors is a full-service business that was incorporated in 1947. Since then, the company has completed many office buildings, hospitals, clinics, industrial buildings, cultural institutions, and educational institutions. It has frequently been ranked among the best contractors in the area, and was named one of ENR’s Top 400 Contracting Firms and San Francisco Business Times’s Largest General Contractors in the Greater Bay Area in 2022. It was also ranked among the Top Office Contractors, Top Contractor Giants, and Top Contractors in California in 2021.

The Long Beach site of Laserfiche was expanded with this new four-story build-to-suit corporate office constructed by Millie and Severson General Contractors. By 2025, the campus is anticipated to grow from 300 to 600 staff. The place was designed by the firm’s design partner, Studio One Eleven, in a Mid-Century style, and was influenced by a nearby structure created by renowned Mid-Century architect Edward Killingsworth. This award-winning project will improve the campus for Laserfiche, who has proudly operated in Long Beach since 2001. The project earned both LEED and WELL Gold certifications and won the 2022 LABJ Best Headquarters Project Bronze Award.

DPR Construction

945 Front St. San Francisco, CA 94111

DPR Construction exists to “build great things.” Operating in Sacramento since 1990, DPR is a self-performing contractor focused on highly complex and technical projects. The firm’s core markets include advanced technology, commercial, healthcare, higher education, and life sciences. From small tenant improvements to large-scale multi-million-dollar complexes, DPR focuses on fulfilling customer needs and providing the highest possible value.

Built by DPR for the City of Roseville, 316 Vernon Street is a four-story, 82,000-square-foot, multi-use, multi-tenant office complex. In creating this project, the firm used target value design and design-assist approaches. Though the building was initially intended to be made of structural steel, the firm used a structural precast instead, as it was found to offer more resilience. In addition, a structural precast was adopted to maximize occupant versatility, since it required fewer columns. The building’s frame serves as both its structural support and architectural veneer. Such innovation allowed for a total construction timetable of 14 months. The impressive work done on 316 Vernon Street was awarded with the 2017 American Society of Civil Engineers (ASCE) Outstanding Sustainable Engineering Project of the Year award. 

GCI General Contractors

875 Battery St. Floor 1, San Francisco, CA 94111

GCI General Contractors is a renowned, award-winning general contracting company with over 30 years of experience. The company’s goal is to create spaces where people flourish, whether by establishing vibrant start-up offices or cutting-edge labs. It has constructed projects all over the country and for clients in numerous industries. These projects have included renovations, infrastructure, labs, and interiors, and several of these completed projects are recipients of LEED Gold and Silver certifications. GCI is a U.S. Green Building Council (USGBC)-accredited and certified firm, and its team members are LEED APs and Green Associates (GA). 

GCI General Contractors has been featured in numerous publications, including Interior Design Magazine, Architect Magazine, Silicon Valley Business Journal, and The Registry SF. In 2021, it received the Metal Construction News Metal Building Award. It was also featured by Office Snapshots in 2022 for its work on this featured project. For this project, about 3,400 square feet of 2180 Sand Hill Road were intended to be leased out as individual offices. However, a banking company saw its quality and decided to take it over while making a few changes and enhancements that were completed by GCI. 

Quiring General

6660 Owens Dr. Pleasanton, CA 94588

In addition to remarkable structures, Quiring General has been creating strong relationships, communities, and teams since its founding in 1947. It is renowned for completing projects for a very reasonable price, and it displays an unrivaled level of construction expertise with each job. It specializes in projects related to healthcare, multifamily housing, mixed-use, elder living, business, education, hospitality, and religion. Josh Sherfield, the firm’s CEO, has been in the industry for more than 16 years, and is regarded as an expert with an excellent track record of managing teams and individuals from the planning stage to project completion. Before taking over at Quiring General, Sherfield held the positions of vice president and division manager at a reputable structural concrete and concrete prefabrication subcontractor, McClone Construction.

Quiring General completed this renovation and conversion of a warehouse into Class A offices. The project is around 152,000 square feet of office space and includes 36 conference rooms, eight training rooms, three main break areas, and a large patio that can house up to 450 workers. Also included for the project was an additional exterior package, which provides improvements to the signage, landscaping, painting, and mobility of the building. This project was awarded the 2019 Associated Builders & Contractors (ABC) NorCal Excellence in Construction award. 

Environmental Contracting Corporation

880 East 1st St. Los Angeles, CA 90012

Environmental Contracting Corporation (ECC) is among Southern California’s top commercial interior construction companies. Established in 1984 by Aram Arakelian, the firm has since continued a longstanding reputation for offering top-notch interior building services from the start of the project all the way to its completion. Throughout its 40 years, the ECC group has constructed buildings for some of Los Angeles’ most notable clients, including Banc of California, LA Studios, Netflix, Spotify, and the Writers Guild of America. Its diverse client base spans a wide variety of sectors, including corporate, financial, entertainment, media, sports, law, restaurants, retail, hospitality, and higher education.

An office refurbishment was necessary for company Paul Hastings, a longtime client of ECC in Century City. The purpose of the refurbishment was to accommodate the company’s entertainment and media practice, along with its clientele. As you step into the new room constructed by ECC, you’ll notice that it features a simple yet elegant design that is full of new upscale finishes. The firm also sustainably repurposed existing pieces when feasible, and used utmost accuracy and meticulous attention to detail in order to accomplish the clean, sophisticated design. This project won the 2020 International Interior Design Association (IIDA) SoCal Caliber Award for Work Medium.

Howard CDM

17434 Bellflower Blvd. Suite 300, Bellflower, CA 90706

Howard CDM has grown in experience over the past 50 years through executing projects for a wide variety of clients. Its diverse client base includes Sprout LA Restaurant Group, Robertson Properties Group, The Eli and Edythe Broad Foundation, Laemmle Theatres, and Orange County School of the Arts. Founded in 1972, the firm has successfully built a significant reputation for prioritizing the requirements of its clients, cultivating connections, and efficiently realizing project plans. For one of its projects, the Steelcraft Garden Grove, the firm received two 2020 Urban Design Merit Awards from the American Planning Association (APA) Orange Chapter and California Chapter. The project also won the 2019 LABJ  Best Retail/Restaurant Award and the 2016 USGBC Merit Award for Sustainable Sites.

A longtime client of Howard CDM, Bixby Land Company bought 1501 Quail in the revitalized Newport Beach Tech Zone. This corporation had the concept for Avalon, a state-of-the-art, multi-tenant office building that takes advantage of Southern California’s nearly ideal climate. In order to accomplish this, Howard CDM completely renovated the 45,000-square-foot, two-story structure. The refurbishment included new common area corridors, a new second-floor open atrium, and a new building entry façade and lobby. Howard CDM also added separate office suites with new outdoor pop-outs and personal patios.

McCormick Construction

2507 Empire Ave. Burbank, CA 91504

Over 100 years ago, McCormick Construction was established on a foundation of esteem, knowledge, and experience. The firm offers construction and consulting services for both the public and private sectors, and it exercises meticulous attention to the client, contractors, materials, and environment on all of its projects. Its initiatives have improved the built environment and commercial landscape in Nevada, Oregon, Arizona, Utah, Washington, and California. The firm is family-owned and operated by brothers Michael and Steve McCormick, the former of which is principal and CEO. Both brothers have around four decades of professional experience.

McCormick Construction worked on constructing Harlow Sunset Las Palmas. This project is a brand-new, 130,000-square-foot, four-story core and shell office complex with functional floor plates and underground parking. Some of the project’s highlights include a 32,000-square-foot, two-story mezzanine located on the fourth floor, and a parking garage that features secure VIP parking and an electric vehicle (EV) charging outlet. Harlow Sunset Las Palmas is a LEED Gold-certified project and a winner of the 2021 American Concrete Institute (ACI) Southern California Concrete Award Categories: Decorative.

MarketOne Builders

1200 R St. Suite 150, Sacramento, CA 95811

Commercial contractor MarketOne Builders, Inc. creates environmentally friendly workplaces to reflect each company’s distinct vision and goals. The firm was founded in 1997 by Tom Ford and James Fitzgerald on the pillars of trust, confidence, and integrity, and it continues to provide services today from its location in downtown Sacramento’s historic R Street Area. Catering its services to the science, healthcare, and mission-critical sectors, the firm has completed projects that range from landmark urban infill and seismic renovations to award-winning commercial office environments. MarketOne Builders’ involvement in such projects has greatly contributed to Sacramento’s growth and development. 

Design-build team MarketOne Builders and DGA Architects worked together to transform 731 K Street, a three-story downtown corner building. With its huge lettering and contemporary style, the firm’s work on the project has turned it into a widely noticeable landmark. The renovation drew inspiration from art and restoration, while preserving the structure’s historical significance from its origin in the 1960s. The construction also features contemporary elements with a mid-century flair, such as the inclusion of wood, glass, and steel. 3,600 square feet of the 22,000-square-foot structure’s ground floor are designated for  restaurants or other commercial uses, though building tenants may also use the new rooftop patio for exclusive, small gatherings. This project won the 2020 ABC Excellence in Construction award.


  • Jake Gustafson

    Jake has served as Senior Editor at General Contractors and brings a wealth of experience rooted in his passion for building. Holding a degree in Construction Engineering Management from Oregon State University, he actively engaged in industry-related activities, including membership in the Associated General Contractors of America student chapter and participation in the Associated Schools in Construction student competition. Previously, Jake served as a project engineer for a prominent general contractor in Portland, where he played a pivotal role in various aspects of construction projects, from pre-construction to subcontractor management. His expertise extends to working on innovative projects, such as North America's largest CLT commercial building. Expertise: Commercial Construction, Commercial Remodeling, Home Design and Build Key Highlights: Editor at General Contractors, Project Engineer for Portland-based general contractor, Field Engineer for the largest CLT commercial building in North America Education: Oregon State University, Degree in Construction Engineering Management