Over the last 30 years in Ontario, Ledcor has continued to grow and evolve and is now a leading provider of construction services across the province. From our early days building infrastructure and developing communities, to our more recent work in the heavy civil and mining, residential, and aviation sectors, we have always been driven by our commitment to safety, quality, integrity, sustainability, and success.

We are seeking an experienced Senior Estimator to join our team in Oshawa, Ontario, supporting a major GO Transit infrastructure project.

This is a key leadership position responsible for overseeing all estimating activities, from conceptual budgeting and detailed cost estimates to competitive bid submissions and subcontractor procurement.

Essential Responsibilities: Lead the preparation and coordination of comprehensive estimate packages, including quantity takeoffs, costing, subcontractor pricing, and bid submissions.

Develop conceptual budgets, detailed estimates, cost studies, and competitive tenders for complex construction projects.

Review drawings, specifications, terms, conditions, and bid documents to ensure all project requirements are incorporated into estimates.

Analyze outstanding RFIs and identify appropriate bidding strategies for complex project requirements.

Perform quantity takeoffs for large-scale projects and oversee the quantity takeoff process, ensuring accuracy and completeness.

Lead subcontractor and supplier solicitation activities and evaluate submissions.

Recommend subcontractors and suppliers for project award based on scope, pricing, capability, and risk assessment.

Take ownership of estimate accuracy by reviewing and validating all direct and indirect project costs.

Assign and manage bid package responsibilities within the estimating team.

Review construction schedules and execution strategies to ensure alignment with estimate assumptions and project objectives.

Lead estimate review meetings and participate in bid strategy discussions.

Prepare bid clarifications and support proposal development for major projects.

Provide mentorship, guidance, and technical expertise to junior estimators and cross-functional teams.





Serve as a subject matter expert on estimating-related requirements and best practices.

Perform other duties as assigned.

Qualifications: Bachelor's Degree in Engineering, Construction Management, Quantity Surveying, or a related field.

Minimum 10 years of estimating and/or related construction experience.

Proven experience working on large, complex, multidisciplinary construction or infrastructure projects.

Experience within transit, transportation, civil, heavy infrastructure, rail, or major public-sector projects is considered a strong asset.

Demonstrated experience leading estimates from conceptual design through competitive tender submission.

Strong proficiency with Microsoft Office Suite and industry-standard estimating software.

Knowledge of Building Information Modeling (BIM) and model-based estimating is considered an asset.

Thorough understanding of up-to-date construction methods, practices, equipment, and execution strategies.

Strong ability to interpret and analyze construction drawings, specifications, and contract documents.

Comprehensive knowledge of construction costs, budgeting principles, and project scheduling.

Proven ability to manage and close complex tenders, bids, and proposals.

Strong leadership, communication, and stakeholder management skills.

Ability to influence decision-making and present complex information to a variety of audiences.

Strong relationship-building skills with internal teams, subcontractors, consultants, suppliers, and clients.

Working Conditions: Site-based role in Oshawa, Ontario.

Compensation $116,550.00 - $155,400.00 This is the expected base pay range for this role. Individual base pay will be determined based on a variety of factors including experience, knowledge, skills, education and location.



Our competitive total rewards package provides compensation and benefits that support your physical, mental and financial wellbeing.

We offer exciting, challenging work with opportunities to develop your skills and knowledge.

Additional Information Ledcor builds and maintains infrastructure in various industries including oil and gas, transportation, and mining. We’re experts in all infrastructure construction and maintenance related projects.

Our vast projects include: full-scale contract mining, earthworks, foundations, highways, bridges, roads, waterways and resources, airports, rapid transit, underground utilities, pipelines, independent power projects and site reclamation.

Employment Equity At Ledcor we believe diversity, equity, and inclusion should be part of everything we do.

We are proud to be an equal-opportunity employer.

All qualified individuals, regardless of race, color, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, Veteran status or any other identifying characteristic are encouraged to apply.

Our True Blue team consists of individuals from all backgrounds who contribute diverse perspectives and experiences to Ledcor.

We are committed to continuing to build on our culture of empowerment, inclusion and belonging.

Adjustments will be provided in all parts of our hiring process.

Applicants need to make their needs known in advance by submitting a request via email.

For more information about Ledcor’s Inclusion and Diversity initiatives, please visit our I&D; page.

We're a diversified construction company, made up of teams of people who are proven in their industries. All working to design, build, transport, operate, and maintain projects all over North America.

But we believe that projects are about more than concrete and steel. They're about people and the power of partnerships.

Partnerships with our employees, our communities, our contractors and clients.

We believe in building trust in the places where we do business—whether that’s by engaging honestly, by giving back, by putting safety first, or by looking for smarter, more sustainable ways to get the job done right.

📌 Senior Estimator, Infrastructure (Bowmanville)
🏢 Ledcor Group
📍 Bowmanville