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