McMahon Services is seeking an experienced Senior Estimator to join our Engineering & Projects team in Adelaide.

This is an exciting chance to play a leading role within our Precontracts team, delivering complex, multi-disciplinary tenders and helping secure major project wins across Australia.

As a trusted contributor to the tendering process, you’ll work on medium to large-scale opportunities spanning the Water, Defence, Resources, Industrial and Energy sectors giving you exposure to a diverse pipeline of technically challenging and high-profile projects.

Working alongside a highly capable and collaborative team, you’ll bring together technical expertise, commercial insight and strategic thinking to develop competitive submissions that drive business growth.

About McMahon Services

McMahon Services is one of Australia’s largest privately owned construction, industrial and environmental services organisations, operating across Australia and New Zealand with over 1,300 employees. Our reputation is built on integrity, strong relationships and delivering certainty for our customers.

About the Role

This role offers variety and flexibility, with responsibility for leading estimating activities across a range of complex projects. You will work collaboratively with internal teams to develop high quality submissions, robust cost estimates and practical construction methodologies.

What You’ll Do

- Lead the preparation and delivery of detailed cost estimates
- Review and develop estimates using first principles and subcontractor inputs
- Manage tender submissions including EOIs and post tender activities
- Coordinate estimators, engineers and submissions teams
- Develop construction methodologies, programs and cost strategies




- Identify and manage commercial and technical risks and opportunities
- Engage with subcontractors and suppliers to obtain competitive pricing
- Support negotiations and project handover activities

What You’ll Bring

- 7–10+ years’ experience in construction estimating
- Experience delivering medium to large, multi-discipline tenders
- Strong commercial acumen and understanding of cost structures
- Proven ability to manage stakeholders and contribute to team outcomes
- Strong communication, negotiation and problem-solving skills
- Tertiary qualification in Engineering, Construction, Quantity Surveying or similar (desirable)

What Will Set You Apart

- Experience across sectors such as water, industrial, oil & gas or resources
- Strong understanding of D&C;, ECI and construct-only delivery models
- Ability to develop innovative and value-engineered solutions

Why Join McMahon Services?

- Work on complex, high-value projects across critical infrastructure sectors
- Career progression within a growing national contractor
- Collaborative, high-performing team environment
- Strong focus on safety, innovation and continuous improvement

Apply now to take the next step in your estimating career with McMahon Services.

No recruitment agencies please

At McMahon Services, we embrace diversity and inclusion as fundamental values. We believe that a diverse workforce fosters innovation, creativity and a deeper understanding of the communities we serve. We are committed to creating an inclusive environment where all employees feel valued, respected and empowered to contribute their unique perspectives and talents.

We encourage applications from people of all backgrounds, identities and experiences.

📌 Senior Estimator (Adelaide)
🏢 Mcmahon Services
📍 Adelaide