Estimator, Construction, Mechanical Engineer

Location: Woburn, MA
Department: Preconstruction / Estimating
Reports To: Director of Preconstruction

The Estimator prepares detailed and accurate cost estimates for plumbing and HVAC construction projects. This role supports preconstruction efforts by analyzing drawings and specifications, performing quantity takeoffs, evaluating vendor proposals, and developing competitive bids. Working closely with project management, coordination, prefabrication, and field leaders, the Estimator helps ensure pricing accuracy and supports the successful transition from bid to build.

• Review plans, specifications, addenda, and project documents to understand scope and pricing requirements.
• Perform detailed quantity takeoffs for piping, equipment, materials, labor, and installation components.
• Identify design conflicts, missing information, scope gaps, or constructability issues that may affect pricing.
• Develop accurate labor and material cost estimates, factoring in productivity, job conditions, and project constraints.
• Solicit and evaluate vendor and subcontractor quotes for equipment, fixtures, valves, and specialty materials.
• Prepare clear proposal packages including scope clarifications, inclusions/exclusions, alternates, and assumptions.
• Assist in developing value engineering options and cost savings recommendations.

• Maintain organized estimate files, vendor quotes, and documentation throughout the bidding process.
• Work with project teams to understand installation plans, prefabrication opportunities, and logistical considerations.
• Support handoff meetings by clearly communicating estimate details, assumptions, and scope breakdowns to Project Managers.
• Track historical cost data and update internal databases to support future estimate accuracy.
• Monitor labor trends, equipment lead times, material cost fluctuations, and market conditions.
• Assist with budget estimates, conceptual pricing, and early phase project planning.

• Experience estimating plumbing, HVAC, or mechanical construction projects preferred.
• Ability to read and interpret mechanical drawings, specifications, and coordinated documents.
• Strong analytical, mathematical, and organizational skills.
• Proficiency with estimating or takeoff software, spreadsheets, and digital plan review tools.
• Strong communication skills and ability to collaborate with vendors, project teams, and leadership.
• Detail oriented, thorough, and capable of managing multiple deadlines.

Estimators play a critical role in setting projects up for success. In this position, you will work on a range of commercial and institutional projects while developing deep technical and financial expertise. Your work directly influences project outcomes and strengthens the company’s competitive position in the market.

Be a part of our dynamic team! We offer exceptional benefits including a 401(k) plan, excellent health insurance, and more.

Located just north of Boston, P.J. Dionne Company has been a leading commercial plumbing and HVAC contractor serving the greater Boston area since 1991.

Starting as a small plumbing company, P.J. Dionne Company has grown steadily into a team of over 150 highly skilled service professionals and support staff. We are proud of our reputation as one of the most customer-focused contractors in the area, handling a wide variety of projects—large and small, renovations and new construction, service and maintenance. Our success is built on our ability to adapt to emerging technologies and changing customer requirements.

We offer exceptional benefits including a 401(k) plan, excellent health insurance, and more.