The largest architectural firms across the globe are recognized for their worldwide reach, impacts, and innovations in the fields of sustainable development, urbanism, and technology. These firms undertake various kinds of projects, such as commercial, residential, health care, and infrastructure projects, indicating their wide range of portfolios. In terms of ranking, the number of architects in the firm, the international revenue, and the project details demonstrate how each firm holds sway in the construction world.
The largest architectural firms undertake projects that establish benchmarks across continents, striving to reconcile beauty with functionality and sustainable practices to address current urban challenges. British architectural firms, namely, Foster + Partners, BDP, Zaha Hadid Architects, and Allford Hall Monaghan Morris, are also ranked in the list, with global positions of 22, 24, 31, and 43, respectively. With the increasing need for sustainable infrastructure, these companies are well-positioned to develop resilient, striking, and green cities.
Here are the ten largest architectural firms around the globe:
1. Gensler
Headquarters: San Francisco, California, United States
Gensler, a San Francisco architectural firm, is recognized as the largest architectural firm, with around 3000 architects working in all its branches globally. Established in 1965, Gensler has become a pioneer in different sectors of design, including landscapes, interiors, and structure. Its range of works encompasses notable projects such as the Shanghai Tower and Silicon Valley’s Facebook headquarters. Gensler is famous for its innovative style and responsible architecture, making use of green principles and ethos, of which many are LEED-certified projects that seek to use energy more efficiently and reduce the impact on the environment. Approaching $1 billion in revenues every year, Gensler keeps on raising the bar in contemporary architectural practice.
2. Arcadis
Headquarters: Amsterdam, Netherlands
With a workforce of almost 2,000 architects, Arcadis has emerged as one of the largest architectural companies in the world. Arcadis was started as a design and consultancy firm but later acquired Canada’s IBI Group architecture firm in 2022 to enhance its architectural market in North America. The company is known for its specialization in infrastructure and urbanism through signature works such as the Abu Dhabi Metro and Changi Airport in Singapore. In turn, Arcadis has also played a key role in investing in sustainable infrastructure, corresponding to its strategic desire to promote green cities and efficient transit systems.
3. Henningson, Durham, and Richardson, Inc. (HDR)
Headquarters: Omaha, Nebraska, United States
Established in 1917 and located in Omaha, HDR has more than 1,400 architects on its staff and specializes in healthcare, science, and transportation projects. HDR has initiated many mega projects as a result of their interdisciplinary approach, including the Chengdu Transit-Oriented Development in China and the reconstruction of research sanctuaries in Canada. HDR has shined in extending sustainable design into projects where there is environmental concern and urban green areas inherent. With such an articulated philosophy regarding landscape improvement, HDR places high regard in both architecture and engineering.
4. Nikken Sekkei
Headquarters: Tokyo, Japan
Having existed for more than 100 years, Nikken Sekkei is the second-largest architectural firm in Japan, with approximately 1,300 architects on staff. Based in Tokyo, Nikken Sekkei is known for effectively combining the elements of conventional Japanese art and skills with modern architectural practices. The Tokyo Skytree, a present-day iconic architectural structure, is one of a few examples of Nikken Sekkei’s ability to design and construct beautiful structures that are both culturally emphatic and technologically innovative. To further illustrate this point, the company’s contributions to the Narita International Airport reflect its design attitude and ability to create spaces that process millions of people, exhibiting user-centered design.
5. Sweco
Headquarter: Stockholm, Sweden
About 1,300 architects work in the Swedish-based architectural firm Sweco, which focuses on environmental design and sustainable architecture. It is a well-known urban planning company that incorporates ‘green’ concepts in its work, such as the revitalization of the Nordic rail networks. The combined engineering and architectural practice of Sweco enables it to handle very large infrastructure projects all over Europe. This emphasis on design integration has enhanced its standing among the urban centers in Europe as a firm that promotes eco-friendly design and infrastructure that can withstand the effects of climate change.
6. Perkins & Will
Headquarters: Chicago, Illinois, United States
Perkins & Will is a Chicago-based architectural firm with over 1200 architects on board and has been noted for its projects in the healthcare, education, and commercial sectors. Perkins & Will was established in 1935 and has earned its reputation by promoting green building design and sustainability. Some of the prominent works include the Shanghai Natural History Museum and the Art Museums at Harvard University, which illustrate the firm’s principles of balancing functionality with effective ecological concepts. Perkins & Wills focuses on clean healthy sustainable design that has brought the firm many accolades and strong international growth.
7. Architecture, Engineering, Construction, Operations, and Management (AECOM)
Headquarters: Dallas, Texas, United States
The Texas-headquartered AECOM is a multinational firm that recruits architecture, engineering, and planning professionals across both the public and private sectors. AECOM is known for its infrastructure works and has engaged in massive projects such as urban renewals, hospitals, and schools. One of the ways AECOM has shown its commitment to the challenges of architecture today, particularly concerning climate change, is by facilitating the construction of sustainable cities. The combination of AECOM’s wide-ranging services and dedication to resilience and sustainable practices has made it one of the leaders in architecture and engineering works across the globe.
8. Perkins Eastman
Headquarters: New York City, United States
Known for its human-centered architectural design approach, Perkins Eastman employs roughly 800 architects and makes much revenue from healthcare, senior living, and educational projects. The firm has its headquarters in New York City. The most acclaimed project by the firm is the modernization of the public school system of New York City, which employs a great deal of emphasis on inclusivity and access in its designs. The core values of Perkins Eastman consider people as the most important element, which makes the firm a leader in designing comfortable and functional spaces that support the needs of the community.
9. Dana Larson Roubal and Associates (DLR Group)
Headquarters: Omaha, Nebraska, United States
Based in Omaha, Nebraska, DLR Group has a workforce of about 700 architects and is dedicated to combining design and functionality. With projects in education and public work, DLR Group is known for its creative efforts in creating sports complexes, educational facilities, and art museums. The Safe Credit Union Performing Art Center in United States stands out among DLR Group projects as a sustainable design dedicated to the needs of the community. The firm maintains its well-respected place in the balancing architecture by harmonizing conflicting environmental management and aesthetic considerations.
10. Harwood Knox Smith (HKS)
Headquarters: Dallas, Texas, United States
HKS is headquartered in Dallas, Texas, and is known primarily for hospitality and healthcare architecture with a team of more than 700 architects. Projects such as the SoFi Stadium in Los Angeles and other luxurious hotel complexes depict HKS’s ability to design spaces that immerse the end user. HKS is also a proponent of green buildings, with an increasing number of its projects qualifying for LEED rating. Its diverse portfolio across industries makes HKS a very powerful architectural firm in the field.
