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 modern 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.
Robust 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 #LI-NC1
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.
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.
Our workplace culture has been recognized as one of Canada’s Best Diversity Employers, Canada’s Most Admired Corporate Cultures, and a Top 100 Inspiring Workplace in North America.
Employment Equity At Ledcor we believe diversity, equity, and inclusion should be part of everything we do. We are proud to be an equal-opportu

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📌 Senior Estimator, Infrastructure (Ontario)
🏢 Ledcor
📍 Ontario