Notable projects
Transportation infrastructure
Mott MacDonald played a pivotal role in the design and project management of Heathrow Terminal 5, a major expansion project at London's Heathrow Airport that opened in 2008 and increased the airport's capacity by 30 million passengers annually.[57] As one of the British Airports Authority's (BAA) first-tier integrated suppliers, the firm served as the primary design engineer for the £4.2 billion initiative, which encompassed structural, mechanical, electrical, and hydraulic engineering across the terminal's five main buildings and associated infrastructure.[58] This project, one of Europe's most ambitious airport developments at the time, integrated advanced baggage handling systems and rail connections to enhance operational efficiency.[57]
In India, Mott MacDonald has contributed engineering and consultancy services to multiple phases of the Delhi Metro system since the early 2000s, supporting the design and construction of significant portions of the network that serves millions of passengers daily.[59] The firm was appointed as detailed design consultant for Phase III in 2013 by the Hindustan Construction Company and later joined a consortium led by PADECO for Phase IV consultancy in 2023, focusing on feasibility studies, tunnel engineering, and station development across 65 kilometers of new lines. These efforts have been instrumental in transforming urban mobility in the National Capital Region, reducing congestion and promoting sustainable transit.[60]
For the Silicon Valley BART Extension in the United States, Mott MacDonald is part of a joint venture with PGH Wong Engineering, providing tunnel and station design services for Phase II of the project, which extends the Bay Area Rapid Transit system by 6 miles to serve Santa Clara County.[61] Awarded in 2019, the firm's role includes geotechnical analysis, structural engineering, and innovative station designs aimed at integrating with local communities, with operations expected to commence in the early 2030s to boost economic connectivity in the tech hub. This extension addresses growing transit demands in a region with over 1.8 million residents, emphasizing resilient infrastructure against seismic risks.[61]
More recently, Mott MacDonald has advanced high-speed rail infrastructure in the UK through its involvement in the HS2 project, designing key bridges such as the Delta Junction viaduct and the heaviest bridge segment installed ahead of schedule in May 2025.[62] Working in joint ventures with SYSTRA, the firm has contributed to structural engineering and landscape integration for these elements, with construction activities ramping up in 2025 to support the 225-mile network's goal of reducing journey times between London and northern cities.[63] Complementing this, Mott MacDonald's design services for the Northern Line Extension in London, completed in 2021, added 3 kilometers of twin-bored tunnels and two new stations, enhancing urban rail capacity by 25,000 daily passengers to Battersea Power Station.[64]
Energy and environment
Mott MacDonald has a long history in hydropower development, tracing back to its heritage, with Sir Murdoch MacDonald contributing to the heightenings of the Aswan Dam in Egypt over a century ago, including the first in 1912 and the second (1929-1933) by the predecessor firm Sir M. MacDonald & Partners to enhance hydroelectric capacity. This early involvement established expertise in large-scale water resource projects, including irrigation and power generation along the Nile. In modern contexts, the firm has extended its African portfolio through projects like serving as owner's engineer for the 180 MW Ngonye Falls hydropower scheme on the Zambezi River in Zambia, which generates approximately 830 GWh annually to power around 200,000 households and supports regional energy security; the project received Africa's first Hydropower Sustainability Standard certification in October 2025, with completion expected in 2028.[65][66]
In renewable energy, Mott MacDonald has played a key role in advancing offshore wind in Japan during the 2020s, notably as lenders' technical advisor for the 220 MW Kitakyushu Hibikinada project, the country's largest privately financed offshore wind farm. Appointed in 2021, the firm conducted due diligence on geotechnical, meteorological, and environmental risks, while assessing supply chain resilience against challenges like earthquakes and typhoons; construction milestones include pile installation from late 2023 to 2024, with full commissioning targeted for 2026 to supply clean energy and model future net-zero initiatives.[67]
The firm also supports UK grid integration of renewables, providing front-end engineering design (FEED) and technical advisory to National Grid Electricity Transmission for the Eastern Green Links 3 and 4 projects from 2024 onward. This involves planning approximately 100 km of onshore high-voltage direct current (HVDC) cables and converter stations to connect Scotland's offshore wind resources to England, aiding the UK's 50 GW offshore wind target by 2030 and potentially creating up to 130,000 jobs while adding £11 billion in economic value.[68]
On the environmental front, Mott MacDonald has innovated in pollution control through biological water pre-treatment solutions, such as the deployment of 31 floating wetlands at the Witches Oak Raw Water Pumping Station for Severn Trent Water. These constructed ecosystems, rich in biodiversity, provide preliminary treatment by removing 40% to 60% of total nitrogen and phosphorus from reservoir water, rehabilitating an underused resource amid low flows and reducing downstream chemical treatment needs.[69]
Complementing this, the firm partnered in the Green Cities and Infrastructure Programme (GCIP), a £40 million UK aid initiative that ran through September 2025 and supported 36 cities in low- and middle-income countries, including Indonesia, Mozambique, and Zambia. As a technical advisor in a PwC-led alliance, Mott MacDonald assisted in developing climate-resilient infrastructure for transport, energy, and urban planning, prioritizing sustainable investments to enhance urban livability and environmental resilience.[70]
Buildings and urban development
Mott MacDonald has played a significant role in designing sustainable and integrated buildings within urban environments, emphasizing innovative engineering to enhance functionality and environmental performance. Their expertise in buildings and urban development encompasses structural engineering, sustainable systems, and community-focused design, ensuring projects align with broader urban regeneration goals.
One prominent example is the Manchester Civil Justice Centre in the UK, completed in 2007, where Mott MacDonald served as the structural and services engineer. The project featured advanced sustainable design principles, including a natural ventilation system that utilized the building's 16-storey atrium and borehole cooling to minimize energy use, achieving BREEAM Excellent certification. This integration of engineering and architecture allowed for passive environmental control, reducing reliance on mechanical systems while accommodating 47 courtrooms in a high-density urban setting.[71][72]
In the United States, Mott MacDonald contributed to the Los Angeles Regional Connector, a 1.9-mile underground light rail project completed in 2023, as the detail designer for the joint venture Regional Connector Constructors. The initiative included three new underground cut-and-cover stations and a crossover cavern, designed to seamlessly integrate with the existing urban fabric by minimizing surface disruption and enhancing connectivity to cultural and economic hubs like Little Tokyo. Features such as floating slab tracks reduced noise and vibration impacts on nearby buildings, supporting urban density while facilitating over 60,000 daily trips and promoting equitable access across Los Angeles County.[73]
Mott MacDonald is also leading efforts in the UK's New Hospital Programme, announced in 2019 and launched in 2020 to deliver or upgrade 40 National Health Service facilities by 2030, with a focus on industrialized design methodologies. As head of the interim delivery partner team, the firm develops standardized "kits of parts" using design for manufacture and assembly (DfMA) principles, enabling modular construction that aims for 25% time savings and 20% cost reductions across multiple sites. This approach, applied to cohorts of hospitals including ongoing projects in Cohorts 3 and 4, incorporates digital tools and a "hospital playbook" to ensure consistent quality and adaptability in urban healthcare infrastructure.[74]
Beyond specific structures, Mott MacDonald integrates accessibility and social impact into urban developments to promote equity, such as through comprehensive strategies that prioritize inclusive design in built environments. These initiatives underscore a commitment to maximizing community benefits, including empowerment and wellbeing, in equity-focused urban projects.[75]