Mechanical Expertise Built on Experience

Fully licensed and insured mechanical and general contractor with over 30 years of experience serving commercial clients throughout New Hampshire, Maine, Vermont, and Massachusetts.

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ABOUT OUR COMPANY

Built on Experience. Driven by Quality.

RTH Mechanical Contractors Inc. brings over 30 years of trusted commercial mechanical experience. Now led by E.M. Duggan, RTH delivers licensed, insured, and ASME-certified expertise backed by expanded resources and proven leadership.

FEATURED PROJECTS

We Build Projects That Last

ALL PROJECTS

OUR SERVICES

We Offer a Range of Services to Meet All Types of Needs

ALL SERVICES

COMMERCIAL

RTH delivers full-scale commercial mechanical installations for healthcare, industrial, and institutional facilities. Our licensed team ensures safe, code-compliant systems completed on schedule and built for long-term performance.

RESIDENTIAL

RTH provides professional plumbing and mechanical services for multi-family and specialty residential projects. We focus on clean execution, efficient system installation, and dependable performance from start to finish.

PRE-CONSTRUCTION

Our pre-construction services include budgeting, coordination, constructability review, and value engineering. We collaborate early to reduce risk, control costs, and ensure mechanical systems are fully aligned before work begins.

SITE MANAGEMENT

RTH provides experienced field supervision and project management to maintain safety, quality, and schedule control. We coordinate seamlessly with all trades to deliver organized, inspection-ready installations.