Top 10 Largest Architecture Firms In The World 2026: The Architects Behind Global Growth

The architecture industry continues to evolve, shaped by global demands for innovative, sustainable, and functional designs. As urban environments expand and technological advancements redefine building possibilities, certain architecture firms have distinguished themselves as global leaders. Our publication presents the Top 10 Largest Architecture Firms In The World 2026, a comprehensive ranking derived from authoritative industry assessments.

To compile this definitive list, we weighed criteria primarily based on the Building Design's World Architecture 100 (WA100) 2026 report, a respected annual survey of the largest global architectural practices. This ranking considers key metrics such as the total number of architects employed worldwide and the reported fee income for architectural services, providing a clear measure of each firm's scale and market impact. We also cross-referenced insights from other prominent industry reports, including Architectural Record's Top 300 list, to ensure a robust and well-supported analysis. These firms are recognized not only for their sheer size but also for their extensive project portfolios, their influence on urban development, and their consistent commitment to design excellence across diverse sectors. They represent the forefront of architectural innovation, delivering projects that shape cities and communities worldwide.

The List Of The Top 10 Largest Architecture Firms In The World 2026:

1. Gensler

Gensler, headquartered in San Francisco, California, firmly holds its position as the largest architecture firm globally. According to the WA100 2026 report, the firm employs 2,716 architects and reported a fee income exceeding $1.5 billion in 2026. Gensler's dominance is well-established, having consistently topped industry rankings, including Building Design's World Architecture 100 for the ninth consecutive year as of 2024 data, and Architectural Record's Top 300 for 12 consecutive years through 2023. The firm is known for its forward-thinking approach, integrating design with behavioral data to create impactful spaces. Gensler maintains a significant global footprint, operating offices in 53 cities across 17 countries, influencing diverse projects from high-rise structures to interior design and sustainable urban planning.

2. HDR

Securing the second position, HDR is a recognized global leader with multidisciplinary expertise spanning architecture, engineering, and environmental services. Headquartered in Omaha, Nebraska, the firm was established in 1917 and has grown to employ over 10,000 people across more than 225 locations worldwide. For 2026, HDR reported 1,868 architects and a fee income between $800 million and $899 million. HDR particularly excels in healthcare, science, and civic architecture, delivering significant projects across 60 countries. This extensive reach and diversified project base underscore its position as one of the most comprehensive firms in these specialized sectors.

3. Arcadis

Arcadis, based in the Netherlands, is a prominent global design and consultancy firm. While its service offerings extend beyond pure architecture, its substantial architectural division positions it third on the WA100 2026 list. The firm was ranked second in the WA100 2025 survey, demonstrating its consistent presence among the world's largest practices. In 2026, Arcadis employed 1,781 architects and reported a fee income between $330 million and $339 million. Arcadis is widely recognized for its dedication to sustainable solutions and its efforts to enhance the quality of life across various built environments, contributing to urban development, infrastructure, and environmental stewardship.

4. Aecom

Aecom, a US-based multinational engineering firm, holds a significant position within the architecture sector due to its expansive scale and diverse project portfolio. The firm reported 1,529 architects employed in 2026, with an architectural fee income between $500 million and $599 million. While Aecom's total company revenue reaches billions, a considerable portion is specifically attributed to its architectural services. The firm plays a critical role in delivering large-scale infrastructure, design, and construction management projects globally, showcasing its capacity to manage complex and extensive developments across numerous industries, including government, energy, water, and transportation.

5. Sweco Group

Sweco Group, headquartered in Sweden, is a leading European architecture and engineering consultancy. The firm employs 1,491 architects and a total of 17,000 professionals, specializing in architecture, urban planning, and infrastructure across Northern Europe. For 2026, Sweco's architectural fee income was reported between $190 million and $199 million. Sweco is renowned for driving large-scale infrastructure projects and developing climate-resilient designs. Its consistent appearance in the global top five by architect count from Europe highlights its significant influence and expertise in creating sustainable and functional built environments.

6. Nikken Sekkei

Nikken Sekkei, based in Tokyo, Japan, is a global architectural leader with a rich history spanning over a century. The firm consistently delivers innovative and impactful projects, employing 1,427 architects in 2026 and reporting a fee income between $400 million and $499 million. Nikken Sekkei specializes in architecture, urban design, planning, and environmental design, shaping built environments across the world. With its extensive global presence and enduring focus on innovation, the firm continues to be a prominent force in the architectural industry, balancing aesthetic appeal with environmental responsibility and practicality.

7. DLR Group

DLR Group, headquartered in Omaha, Nebraska, USA, is dedicated to integrating design and functionality across its diverse portfolio. The firm employed 901 architects in 2026 and recorded a fee income between $500 million and $599 million. DLR Group is particularly recognized for its projects in education and public work, including innovative sports complexes, educational facilities, and art museums. The firm places a strong emphasis on sustainable design, as exemplified by projects such as the Safe Credit Union Performing Art Center, harmonizing environmental considerations with aesthetic appeal to create meaningful community spaces.

8. Heerim Architects & Planners

Heerim Architects & Planners, a leading firm based in South Korea, maintains a strong presence among the world's largest architectural practices. In 2026, the firm employed 887 architects and reported a fee income between $160 million and $169 million. Heerim is known for its comprehensive architectural services, which encompass planning, design, and construction supervision across various project types. The firm's consistent high ranking reflects its substantial contributions to both domestic and international projects, showcasing its expertise and reliability in the competitive global market.

9. Perkins&Will

Perkins&Will, a prominent US-based firm, is highly regarded for its commitment to advancing sustainability and equity in its architectural designs. The firm employs 876 architects and reported a fee income between $400 million and $499 million in 2026. Perkins&Will consistently ranks among the top practices in the United States and globally. The firm specializes in a wide array of sectors, including healthcare, education, and civic projects, where it prioritizes creating inclusive and accessible environments that effectively serve community needs and foster positive social impact.

10. CannonDesign

CannonDesign, a major US-based firm, rounds out our list of the Top 10 Largest Architecture Firms In The World 2026. The firm employed 875 architects and recorded a fee income between $280 million and $289 million in 2026. CannonDesign is recognized for its integrated design approach, which combines architecture, engineering, and consulting services to deliver comprehensive solutions. The firm focuses on creating transformative environments in critical sectors such as healthcare, education, and science and technology, consistently appearing in leading industry rankings for its impactful and forward-thinking work.