Senior Mechanical Estimator - Mining

Loenbro

Phoenix (AZ)

On-site

USD 120,000 - 180,000

Full time

2 days ago

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Benefits offered by this job

Medical, dental, and vision insurance

401(k) with company match

PTO and holiday pay

Life and disability insurance

Professional development and training

Job summary

Loenbro is seeking a Senior Mechanical Estimator in Gilbert, Arizona to lead cost estimation for multi-discipline construction and industrial services across mining and heavy industry. You will develop detailed takeoffs, price labor, and coordinate with subcontractors to produce winning proposals.

The role requires strong reading of complex drawings, proficiency with HCSS HeavyBid and MS Project, and the ability to travel to mine sites and client facilities as needed.

Qualifications

5+ years of estimating experience in industrial or mining construction.
Ability to read civil, structural, mechanical, piping drawings and specifications.
Proficiency with HCSS HeavyBid or a comparable platform and with Microsoft Project; strong Excel skills.
Working knowledge of MSHA regulations and mining site safety requirements.

Responsibilities

Prepare detailed quantity takeoffs and cost estimates for structural steel fabrication and erection, piping, mechanical equipment setting, civil earthwork and concrete, and electrical scopes.
Analyze RFPs, RFIs, drawings, specifications, and scopes of work to identify cost-driving elements and risks.
Develop labor hour estimates using historical rates and databases; solicit and level subcontractor quotes.
Coordinate bid packages, schedules, and exclusions; support development of project execution and staffing plans.
Attend site walks, pre-bid meetings, and client interviews to gather scope clarity and build relationships.

Skills

Estimating experience

Reading drawings

Communication

Travel readiness

Tools

HCSS HeavyBid

Microsoft Project

Excel

Job description

About Loenbro

Loenbro is a trusted, long-term construction lifecycle partner to thousands of customers across the U.S. Our market spans all industries and our service offerings include Critical Electrical, Mechanical & Structural, Soft Crafts, Inspection, Underground Maintenance and Installation, and Fabrication. Our expertise lies in simplifying the complex and establishing long-standing relationships with our partners. We have a national presence but a local approach—every customer benefits from our capabilities and our care.

Job Title: Senior Mechanical Estimator

Company: Loenbro, LLC

Business Unit/Department: Estimating

Location: Gilbert, Arizona

Reports to: Pre-Construction Manager

Employment Type: Full-Time

FLSA Classification: Exempt

At Loenbro, we don’t just offer jobs—we build careers grounded in integrity, teamwork, excellence, and purpose.

Job Summary

The Senior Mechanical Estimator is a key leader within the Estimating team, responsible for developing accurate, competitive, and comprehensive cost estimates for multi-discipline construction and industrial services projects supporting mining and heavy industrial clients. This role requires the ability to estimate across multiple service lines Structural Fabrication & Erection, Piping, Mechanical Equipment Setting, Civil Earthwork & Concrete, and (as a plus) Electrical and to synthesize those disciplines into cohesive, winning proposals.

The ideal candidate combines strong technical and craft knowledge with commercial acumen, is comfortable reading complex drawings and specifications across trades, and can build relationships with clients, engineers, and subcontractors throughout the pursuit and proposal process. Works with Precon SME Estimators to collaborate an all inclusive bid when needing assistance.

Essential Job Responsibilities

Estimating & Takeoffs

Prepare detailed quantity takeoffs and cost estimates for structural steel fabrication and erection, process and utility piping, mechanical equipment setting and rigging, civil earthwork, concrete (foundations, slabs, structures), and electrical scopes when applicable.
Analyze RFPs, RFIs, drawings, specifications, and scopes of work to identify all cost-driving elements and potential risks.
Develop labor hour estimates using historical production rates, craft labor agreements, and established estimating databases.
Solicit, evaluate, and level subcontractor and vendor quotes for scopes outside self-perform capability.
Build and maintain HeavyBid estimate templates, unit cost databases, activity and cost coding structures, and historical production data across all service lines.
Structure estimates so labor hours, crew makeup, quantities, and production rates can be cleanly exported and handed off to the Scheduling Department for CPM schedule development.

Proposal Development

Compile complete, well-organized bid packages including cost narratives, schedules, exclusions and clarifications, and commercial terms.
Coordinate with Operations, Project Executives, and Safety to validate assumptions, means and methods, and constructability.
Support development of project execution plans, staffing plans, and schedule logic (5x10, 5x12, or other workweek models) as needed for client evaluation.
Partner with the Scheduling Department to deliver estimate-driven inputs for Microsoft Project schedules, and validate that the resulting schedule aligns with estimated durations, manpower loading, and equipment utilization.
Participate in bid strategy sessions and pricing reviews with leadership.

Client & Site Engagement

Attend site walks, pre-bid meetings, and client interviews to gather scope clarity and build relationships.
Respond to client RFIs during the bid period with technical and commercial input.
Support post-award transition, providing estimate handoff and scope clarification to the project ops team.

Cross-Functional Collaboration

Work closely with the Sales and Business Development team to align pursuits with pipeline strategy and account priorities.
Coordinate with Engineering (internal or client-side) on redlines, design clarifications, and constructability feedback.
Track win/loss outcomes and incorporate lessons learned into future estimates.

Required Qualifications

5+ years of estimating experience in industrial or mining construction, with demonstrated exposure to at least two of the core service lines (Structural, Piping, Mechanical Equipment Setting, Civil/Concrete).
Strong ability to read and interpret civil, structural, mechanical, and piping drawings and specifications.
Proficiency with HCSS HeavyBid estimating software, or demonstrated ability to transition quickly from a comparable platform, along with advanced Microsoft Excel skills.
Proficiency with Microsoft Project, or the ability to structure and export estimate data — activity coding, labor hours, crew composition, quantities, and durations — in a format the Scheduling Department can use to build an accurate CPM schedule.
Working knowledge of MSHA regulations and mining site safety requirements.
Strong written and verbal communication skills, with the ability to present estimates clearly to internal and client stakeholders.
Valid driver's license and ability to travel to mine sites and client facilities as needed.

Preferred Qualifications

Experience estimating electrical scopes (substations, MCCs, underground and mine electrical distribution) is a strong plus.
Background as a craft tradesperson, foreman, or field supervisor in one or more of the core disciplines.
Advanced HeavyBid capability: custom biditem libraries, resource setup, activity coding, and HeavyBid-to-scheduling data exports.
Experience with self-perform contractors serving copper, gold, or other hard-rock mining operations.
Degree in Construction Management, Engineering, or a related field, or equivalent field experience.

CORE COMPETENCIES

Multi-discipline fluency — comfortable moving between civil, structural, mechanical, piping, and electrical scopes on the same project.
Analytical rigor — builds estimates from the ground up rather than relying solely on historical rules of thumb.
Commercial awareness — understands margin, risk, and competitive positioning, not just cost.
Collaboration — works effectively across Sales, Operations, Engineering, and Safety.
Deadline-driven execution — manages multiple concurrent bids under tight timelines without sacrificing accuracy.

Physical & Work Environment Requirements

Ability to travel to active mine sites, including underground and surface operations, for site walks and client meetings.
Ability to wear required PPE and pass site-specific safety orientations (MSHA Part 46/48 as applicable).
Primarily office-based with periodic field travel, estimated at 10–25%

Work Environment

Mostly Indoor office setting with controlled temperature.
Frequent Outdoor Mine sites with exposure to extreme weather, potential exposure to noise, dust, chemicals, or other environmental factors.
Travel requirements: up to 25% of time.
Must be able to wear a respirator from time to time at the mine site
This role requires compliance with all applicable safety regulations, personal protective equipment (PPE) requirements, and Loenbro's Environmental Health and Safety (EH&S) policies.

This role requires compliance with all applicable safety regulations, personal protective equipment (PPE) requirements, and Loenbro's Environmental Health and Safety (EH&S) policies.

Benefits

Medical, dental, and vision insurance
401(k) retirement plan with company match
Paid time off (PTO) and holiday pay
Life and disability insurance
Professional development and training opportunities
Employee assistance program (EAP)

Benefits eligibility may vary based on employment classification and hours worked.

Guided By Core Values (LEAD), Grounded In Grit And a Commitment To Excellence, Loenbro Betters Our Families, Customers, And Local Communities. If You’re Ready To Be Part Of a Company That LEADS By