Top Architectural & Engineering Services Companies

AECOM is the world’s trusted infrastructure consulting firm, delivering professional services throughout the project lifecycle – from planning, design and engineering to program and construction management. On projects spanning transportation, buildings, water, new energy and the environment, our public- and private-sector clients trust us to solve their most complex challenges. Our teams are driven by a common purpose to deliver a better world through our unrivaled technical expertise and innovation, a culture of equity, diversity and inclusion, and a commitment to environmental, social and governance priorities. See how we are delivering sustainable legacies for generations to come at aecom.com and @AECOM.

We deliver impactful global solutions to create a more connected, sustainable world — from intelligence to infrastructure, cybersecurity to space exploration. Our 52,000 employees across 50 countries work every day, challenging the expectations of today to reinvent the way we’ll all live tomorrow.

For over 75 years, Arup has been recognized for its vision, talent and tenacity. We are an independent firm, owned in trust by our members. We choose work where we can make a positive difference in the world. Dedicated to sustainable development, the firm is a collective of 18,000 designers, advisors and experts working across 140 countries. Founded to be both humane and excellent, we collaborate with our clients and partners using imagination, technology and rigor to shape a better world. Arup’s primary goal is to develop a truly sustainable built environment. This means that in all our work, we aim to identify a balance between the needs of a growing world population and the finite capacity and health of our planet.

Downer designs, builds and sustains assets, infrastructure and facilities and we are the leading provider of integrated services in Australia and New Zealand. Alongside our Purpose and Promise, our updated Pillars reflect our refreshed ambition. They are the way we do things around here and underpin everything we do. Delivery, Relationships and Thought Leadership remain the foundations of how we think, plan and solve problems together. We also recognise the importance of Sustainability. Our commitment to safety within this pillar is the first priority of our business. With a history dating back over 160 years, Downer is listed on the Australian Securities Exchange and New Zealand Stock Exchange as Downer EDI Limited (DOW). Downer Group employs approximately 26,000 people across more than 700 sites, primarily in Australia and New Zealand.

We Elevate... tomorrow's sustainable cities We are a leading provider of sustainable and smart urban mobility. Together with our customers, we help organize cities: by moving people and goods, and connecting vertical and horizontal transportation systems. Our purpose: we enhance the quality of life in urban environments by providing the best mobility solutions across buildings. Our elevators, escalators, and moving walks transport more than 1.5 billion of us up and down buildings and across transportation hubs every day. We engineer vertical mobility to make urban spaces more comfortable, inclusive, and sustainable. Since our founding in Central Switzerland in 1874, we have been pioneering new technologies and driving innovation. We are combining innovation, tech­nology, and smart mobility with high ethical standards and respect for the envi­ronment. In the world’s growing metrop­olises, our products and services enable quality of urban living for current and future generations.

We’re a global management, engineering and development consultancy. Our Australian and New Zealand operation stretches from Adelaide right through to Auckland and we have over 20,000 staff worldwide. Mott MacDonald has a long history, going back to 1902 and during this time we’ve worked on many wonderful and challenging projects, within areas such as transport to built environment. However, it’s not all about the big stuff as we really embed ourselves in communities by working on smaller, more localised projects. Sustainability is at the heart of everything we do and leaving a legacy that we are proud of matters to us. As an employee-owned company, we take a real interest in creating a diverse and inclusive workplace, putting people before profit. Like what you see? Take a look at our careers page and see how you can help us build a business for all.

Global construction and engineering group Laing O'Rourke has built a reputation for designing and building major commercial and industrial properties, roads, rail systems, entertainment complexes, airfields, and maritime support facilities. The group works on several of the UK's private finance initiative projects for public-sector infrastructure. Laing O'Rourke operates primarily in Europe, but also has growing operations in the Middle East, Asia and Australia. Chairman and CEO Ray O'Rourke founded the group in 1978 and acquired Laing Construction in 2001. The company is part of a consortium (including CH2M Hill and Mace) that will manage development of London's Olympic Park.

Working to create a cleaner, greener, safer world Bechtel helps our customers deliver projects of purpose that create a lasting positive legacy. These are projects that create jobs and grow economies; improve the resiliency of the world's infrastructure; connect communities to resources and opportunity; get us closer to net zero; protect U.S. and allied interests; tackle critical environmental challenges to protect people and the planet; and accelerate progress to make the world a cleaner, greener, safer place. While expertise enables delivery, partnerships ensure long-term success, which is why we align everything we do to our customers’ goals. Since 1898, we have helped customers complete more than 25,000 projects in 160 countries on all seven continents.

Tetra Tech is a leading, global provider of consulting and engineering services. We are differentiated by Leading with Science® to provide innovative technical solutions to our clients. We support global commercial and government clients focused on water, environment, sustainable infrastructure, renewable energy, and international development. With 27,000 associates worldwide, Tetra Tech provides clear solutions to complex problems.