Estimator – Civil Construction & Surface Mining

About us:

Ed Seguin & Sons is a family-owned civil construction, surface mining and aggregate company serving Northeastern Ontario since 1967. We build infrastructure, develop lasting relationships, and give our people the opportunity to make a meaningful contribution.

Our core values—
Leadership, Teamwork, Innovation, Professionalism and Gratitude—guide how we work together.

Building Infrastructure for Life.

The Role
We’re looking for an experienced Estimator who enjoys understanding how work gets built and turning that knowledge into accurate, competitive estimates.

This remote, part-time opportunity offers flexibility while keeping you connected to an experienced operations team. Candidates based in Southern Ontario are encouraged to apply. Employment through a staffing agency is the preferred arrangement.

You’ll prepare estimates for assigned projects involving roads, underground infrastructure, earthworks, aggregates, trucking and surface mining services.

Your responsibilities will include:

Reviewing drawings, specifications, geotechnical reports and tender requirements.

Preparing quantity takeoffs and detailed labour, equipment, material and subcontractor estimates.

Obtaining and comparing supplier and subcontractor quotations.

Working with operations to establish practical construction methods, production rates and schedules.

Identifying scope gaps, risks, assumptions and opportunities to improve competitiveness.

Preparing bid documents and handing off awarded estimates to the project team.

ESS leadership will support bid reviews and retain final pricing approval.

What We’re Looking For

Five or more years of relevant heavy civil estimating experience.

Strong knowledge of road building, earthworks or underground infrastructure.

Experience with crushing, aggregates, drilling and blasting, or surface mining is an asset.

Proficiency in Excel and digital takeoff tools such as Bluebeam.

Ability to prepare detailed estimates independently, explain assumptions clearly and meet deadlines.

Relevant technical education or an equivalent combination of estimating and field experience.

Professional judgment, discretion and a commitment to protecting confidential information.

The schedule will be agreed around assigned tenders, with daytime availability for coordination and bid closings. Occasional travel to Northern Ontario may be required by prior arrangement. Candidates must disclose outside work that could create a conflict of interest.

What We Offer

Hourly compensation will be competitive based on relevant experience and demonstrated capability.

Approximately 20–30 hours per week, with additional hours by agreement.

Remote work with flexibility in scheduling.

Direct access to experienced field personnel and company leadership.

Varied projects and the opportunity to influence how work is planned and priced.

A family-owned environment where your expertise and contributions are valued.

Learn more at

Final date to receive applications:
October 30, 2026

We thank all applicants for their interest. Only candidates selected for an interview will be contacted. Accommodation is available throughout the recruitment process upon request.