Contractor Ecosystem Overview

The Mukaab and broader New Murabba development are supported by a multi-firm contractor ecosystem that brings together some of the world’s largest engineering, architecture, and construction management companies. Understanding the roles, responsibilities, and interrelationships of these firms is essential for assessing project delivery capability, schedule risk, and the organizational complexity of managing the world’s largest building project. The ecosystem encompasses firms from the United States, Canada, the United Kingdom, and Saudi Arabia, reflecting both the global nature of mega-project expertise and the Kingdom’s strategy of pairing international capability with local execution knowledge.

The total contractor ecosystem serves a $50 billion project spanning 19 square kilometers, 18 neighborhoods, 104,000 residential units, 9,000 hotel rooms, and an iconic cube structure containing 2 million square meters of floor space. The coordination challenge is proportional to this scale: each firm operates under its own contractual framework with the New Murabba Development Company, creating a web of interfaces, deliverables, and dependencies that must be managed to prevent scope gaps, schedule conflicts, and quality inconsistencies.

AtkinsRealis — Masterplan Architect and Designer

AtkinsRealis (formerly SNC-Lavalin), headquartered in Montreal, Canada, holds the masterplan design commission for both the Mukaab building and the 19-square-kilometer New Murabba development. The firm provides advisory, architecture, masterplanning, and engineering services — a scope that positions AtkinsRealis as the design authority for the project’s overall vision and physical form.

AtkinsRealis’s design scheme, influenced by Najdi architecture and inspired by the historic Murabba Palace, shapes the building’s cube form, triangular facade cladding, interior spiral tower, and the urban design framework connecting the Mukaab to surrounding neighborhoods. The firm’s masterplan establishes the fundamental spatial relationships — where buildings sit, how streets connect, where open spaces occur, how utility corridors run — that every other contractor must work within.

The rebranding from SNC-Lavalin to AtkinsRealis reflected a corporate reorganization that consolidated the company’s professional services and nuclear divisions under a unified brand. The firm employs approximately 36,000 people globally and has significant Middle Eastern presence through its Atkins subsidiary, which has operated in the Gulf region for decades. This regional experience — including work on major projects in the UAE, Qatar, and Saudi Arabia — provides AtkinsRealis with institutional knowledge of Middle Eastern construction practices, regulatory requirements, and cultural expectations that pure Western firms would lack.

As masterplan architect, AtkinsRealis establishes the design standards, material specifications, and aesthetic guidelines that all other contractors must follow. This role carries particular weight in a development like New Murabba, where architectural coherence across 18 neighborhoods and dozens of building types requires consistent application of design principles over a 17-year construction program.

Bechtel — Project Management (Masterplan and Infrastructure)

Bechtel, the US-based engineering and construction giant, signed an agreement with NMDC in August 2023 covering project management services for the New Murabba masterplan and site-wide infrastructure. Bechtel’s scope encompasses the coordination of infrastructure delivery including roads, utilities, public spaces, and the integration of the Mukaab site with broader city systems. Bechtel brings experience from mega-projects worldwide including the Channel Tunnel, Jubail Industrial City in Saudi Arabia, Hong Kong International Airport, and major sections of the US interstate highway system.

Bechtel’s role as infrastructure project manager places the firm at the organizational center of the development’s delivery. Infrastructure — roads, water, sewage, electricity, telecommunications, and public realm — must be delivered before buildings can be occupied, making Bechtel’s schedule management directly critical to the project’s phased delivery targets. The firm must coordinate the sequencing of infrastructure construction across four phases: Phase 1 (2030), Phase 2A aligned with FIFA 2034, Phase 2B (2035), and Phase 3 (2040).

Bechtel operates as one of the largest privately held companies in the United States, with over 125 years of operational history and annual revenues exceeding $20 billion. The company’s Saudi Arabian experience extends well beyond the Jubail Industrial City to include decades of project delivery across the Kingdom, providing established relationships with government entities, subcontractors, and suppliers that accelerate project mobilization. This heritage of Saudi operations means that Bechtel understands the regulatory environment, labor market dynamics, procurement practices, and cultural context within which New Murabba must be delivered.

Aecom — Project Management (Buildings)

Aecom, another US-based professional services firm, provides project management services for all buildings within the New Murabba development except the Mukaab itself. This scope includes residential buildings across the planned 104,000 units, commercial offices occupying 1.4 million square meters, hotels encompassing 9,000 rooms, retail structures spanning 980,000 square meters, leisure assets across 620,000 square meters, and community facilities covering 1.8 million square meters.

The explicit exclusion of the Mukaab from Aecom’s scope is architecturally and organizationally significant. It suggests that the iconic cube building’s project management is handled through a separate arrangement — potentially directly by NMDC through a dedicated project management office, or through a specialist firm not yet publicly disclosed. The Mukaab’s unprecedented structural requirements, the 1 million tonnes of steel, the holographic dome technology, and the immersive experience integration may demand project management capabilities beyond the conventional building delivery that constitutes Aecom’s New Murabba scope.

Aecom is one of the world’s largest professional services firms, with approximately 51,000 employees and a project portfolio spanning infrastructure, environmental, and construction services globally. The company’s building project management experience includes major developments across the Middle East, positioning it well for the residential and commercial building delivery that comprises the majority of New Murabba’s physical output.

The Bechtel-Aecom interface deserves particular attention. Two project management firms operating within the same development with overlapping geographic footprints but distinct scopes (infrastructure versus buildings) creates an interface that must be managed through clear demarcation of scope boundaries, shared schedule protocols, and coordinated site logistics to prevent the conflicts that arise when multiple management organizations compete for authority on the same construction site.

Parsons Corporation — Infrastructure Lead Design Consultant

Parsons Corporation was awarded a 60-month contract by NMDC in January 2026 to serve as Infrastructure Lead Design Consultant (ILDC) for infrastructure, public buildings, landscape, and the public realm. This appointment is notable for its timing — January 2026, the same month as the Mukaab construction suspension — signaling that infrastructure design and delivery continue on schedule even as the Mukaab building itself undergoes feasibility review.

Parsons Corporation, headquartered in Centreville, Virginia, brings global infrastructure design experience to the role. The firm’s portfolio includes transportation systems, water infrastructure, and urban development projects across the Middle East, including significant work in Saudi Arabia, the UAE, and Qatar. The 60-month contract term spans from January 2026 through approximately January 2031, aligning with the Phase 1 completion target and extending into Phase 2A.

The ILDC role positions Parsons as the design authority for New Murabba’s civil engineering backbone: the roads, utilities, public buildings, and landscapes that define the quality of urban life within the development. This scope complements AtkinsRealis’s architectural masterplan by translating high-level spatial concepts into engineered infrastructure specifications. The Parsons-AtkinsRealis design interface is critical: Parsons must implement AtkinsRealis’s urban design vision while meeting Saudi engineering codes, utility capacity requirements, and the walkable 15-minute downtown concept that defines the development’s mobility philosophy.

HSSG Foundation Contracting — Piling Works

HSSG Foundation Contracting executes the piling works for the Mukaab, with 1,000 of 1,200 piles installed as of September 2025 — representing 83 percent completion. As a specialist foundation contractor operating in the Saudi Arabian market, HSSG’s role is confined to the below-grade structural elements that prepare the site for the superstructure. The piles must anchor through the al-Qirawan site’s variable soil layers — windblown sand, cemented sarooj formations, and deeper rock substrates — into stable bedrock capable of supporting the 400-meter cube structure containing 1 million tonnes of structural steel.

The HSSG contract represents one of the largest foundation contracts in Saudi Arabian construction history, commensurate with the project’s scale. HSSG’s scope includes pile installation using bored or driven methods appropriate to local soil conditions, load testing to verify capacity against structural design requirements, and quality assurance documentation that feeds into the structural engineering acceptance process. Each of the 1,200 piles must be individually verified, creating a quality assurance program of considerable scope.

The January 2026 suspension explicitly exempts piling from the construction pause, confirming the critical-path nature of HSSG’s work. Foundation operations must be completed before any superstructure work can begin, and pausing piling would create a gap in the construction sequence that could not be recovered without extending the overall timeline.

Arup — Stadium Designer

Arup, the UK-headquartered global engineering firm, was appointed in July 2024 as lead designer for the New Murabba Stadium. The stadium, with a capacity of 46,010, will serve as a venue for the FIFA 2034 World Cup and subsequently function as a community and entertainment hub. Arup’s design draws inspiration from the native Acacia tree of the Arabian Peninsula, creating a biomimetic roof structure that provides shade — essential in Riyadh’s extreme climate — while expressing the region’s natural heritage.

Arup operates as an employee-owned firm with approximately 18,000 staff worldwide, renowned for structural engineering innovation. The firm’s portfolio includes the Sydney Opera House, the Beijing National Stadium (Bird’s Nest) for the 2008 Olympics, the Centre Pompidou in Paris, and numerous FIFA World Cup venue designs. This heritage of iconic sporting and cultural venue design positions Arup to deliver a stadium that meets FIFA’s exacting technical requirements while establishing an architectural identity that contributes to New Murabba’s broader brand.

Stadium construction is planned to begin in 2027, with the venue opening in 2032 — two years before the FIFA 2034 World Cup. The stadium is part of a $20 billion national stadium development program encompassing 15 venues, positioning Saudi Arabia’s sports infrastructure as a catalyst for broader economic and tourism development across the Kingdom.

Coordination Challenges and Organizational Risk

The multi-firm structure creates organizational complexity that represents both a strength and a risk. The strength lies in assembling best-in-class capability across every discipline — AtkinsRealis for design vision, Bechtel for infrastructure delivery, Aecom for building management, Parsons for infrastructure design, HSSG for specialist foundations, and Arup for iconic venue design. No single firm could provide all of these capabilities at the level required.

The risk lies in the interfaces between firms. Each contractual boundary creates a potential failure point where information may be lost, responsibilities may be unclear, schedules may misalign, and accountability may be diffused. The NMDC board, chaired by Crown Prince Mohammed bin Salman, must maintain strategic oversight while the operational management layer coordinates daily across six or more major firms and dozens of specialist subcontractors.

Safety Governance Across the Ecosystem

The multi-firm structure creates particular challenges for construction safety governance. Each firm operates under its own corporate safety management system, with distinct reporting protocols, incident investigation procedures, and safety culture norms shaped by different national regulatory environments. Bechtel applies US-standard safety practices refined over 125 years of operations. AtkinsRealis follows Canadian and UK safety frameworks. HSSG operates under Saudi Arabian OSHA regulations. Harmonizing these systems into a coherent site-wide safety program — where a worker can move between zones managed by different contractors without encountering conflicting safety rules — requires an overarching safety governance framework managed at the NMDC level.

The scale of the combined workforce during peak construction — potentially exceeding 30,000 workers across the full New Murabba development — makes safety incidents statistically inevitable despite best-practice prevention measures. The contractor ecosystem must operate with unified emergency response protocols, shared medical facilities, and coordinated incident reporting that allows NMDC to identify systemic safety risks across contractor boundaries. Lost-time injury rates, near-miss reporting, and safety observation programs must be standardized across all firms to enable meaningful comparison and continuous improvement.

Procurement and Supply Chain Integration

The contractor ecosystem’s procurement activities must be coordinated to prevent competition between firms for the same materials and subcontractor resources. Six major firms simultaneously procuring steel, concrete, mechanical equipment, and specialist subcontractor services in the Riyadh market will drive up prices and create delivery conflicts unless procurement is coordinated through a central supply chain management function. Bechtel’s project management role likely includes this coordination, establishing preferred supplier agreements, bulk procurement programs, and delivery scheduling frameworks that benefit from the project’s enormous purchasing power — the $50 billion budget represents leverage that no individual contractor could achieve independently.

The 40 million cubic meters of excavation, 1,200 piles, and future 1 million tonnes of steel all flow through supply chains that must be resilient against disruption. The contractor ecosystem’s geographic diversity — firms from the US, Canada, UK, and Saudi Arabia — provides some supply chain resilience through access to different regional supplier networks, but also introduces coordination complexity across time zones, languages, and business practices.

For independent reporting on the firms comprising this ecosystem, see Engineering News-Record for annual industry rankings and Construction Week Online for Middle East project coverage.

Contractor Ecosystem Overview