Senior Estimator - Water Infrastructure

ACCIONA is a global company, leading in the development of regenerative infrastructure that creates a positive impact on society. Our workforce consists of more than 65,000 professionals, present in more than 40 countries across the five continents, all contributing in our mission to design a better planet. Are you a passionate individual who wants to make a difference, promote sustainable development, and find solutions to the biggest global challenges including climate change, overpopulation, and water scarcity?

Come and join us in building the infrastructure our planet needs to achieve a sustainable future.

Be part of a landmark tender shaping Australia’s water future — and stay on to deliver the projects.

ACCIONA Agua is a global leader in sustainable water infrastructure, delivering innovative solutions across the full lifecycle of water projects — from design and construction to operation and long-term management.

We are currently bidding on a few major water infrastructure tenders in Australia, with a strong pipeline of future project deliveries across the SA region. As part of this growth, we are seeking an experienced Senior Estimator (Mechanical/Electrical) to play a critical role from the bid stage through to execution.

This is a rare opportunity to leave your mark on nationally significant water infrastructure projects and grow your career with a world‑class organization.

• Join a high-profile, large-scale water tender and projects in the region
• Transition from tender phase into delivery, ensuring continuity and ownership
• Work on complex, multidisciplinary electromechanical systems
• Be part of ACCIONA’s long-term expansion of water projects in Australia

• Develop accurate, competitive cost estimates for large-scale desalination projects
• Lead detailed quantity take-offs and robust cost forecasting
• Manage multiple bids simultaneously, acting as the key interface with senior leadership
• Coordinate estimates across mechanical, electrical, civil, and subcontracted scopes
• Review and refine estimates in response to project requirements and client feedback
• Participate in pre‑ and post‑bid meetings and ensure full compliance with client and regulatory standards

• Partner with internal teams and key subcontractors to obtain pricing for labor, materials, and specialized equipment
• Maintain and enhance historical cost databases and utilise internal estimating systems
• Ensure knowledge transfer to delivery teams once projects are awarded

• Mentor and support junior estimators, fostering technical excellence and consistency
• Contribute to the development of estimating standards and best practices across the business

• Develop and maintain company-wide estimating methodologies and governance
• Ensure that estimating tools align with industry best practices
• Collaborate closely with Quality Management to maintain high compliance and control standards

• Bachelor’s degree in Mechanical or Electrical Engineering (or related field).
• Minimum 5 years’ experience in estimating for major water infrastructure projects, ideally in desalination.
• Proven ability to deliver accurate cost estimates for large-scale projects (treatment plants, pipelines, pump stations).
• Strong knowledge of construction methodologies and cost estimation systems.
• Proficiency in estimating software and MS Word, Excel, and Access.
• Excellent communication and client relationship management skills.

• Be part of a major, career-defining tender
• Stay on to deliver the projects you helped win
• Work for a global, purpose-driven company committed to sustainability and innovation
• Long-term career growth in Australia’s fast-growing water infrastructure sector
• Collaborative, international environment with access to global expertise

ACCIONA has been given the Top Employer 2022, 2023, 2024 & 2025 certification in Australia, which certifies the company’s commitment to excellence in human resources management and those who focus on putting their people first through their exceptional HR policies. Since establishing a presence in Australia in 2002, ACCIONA has made significant investments in local opportunities and project development. ACCIONA employs more than 3,000 people in its renewable energy, infrastructure and water projects across Australia & New Zealand.

We are an Equal Opportunity Employer and promote equality and diversity. Indigenous Australians and candidates from minority groups are encouraged to apply.