Grunau Company: A Trusted Mechanical Systems Contractor in Oak Creek, WI

For over a century, Grunau Company has been a cornerstone of commercial and industrial building systems in Southeastern Wisconsin. Based in Oak Creek, WI, this family-founded business has grown into a full-service mechanical contractor known for reliability and innovation. They handle the complex systems that keep buildings safe, comfortable, and operational.

Business Overview

Grunau Company focuses on commercial and industrial projects. Their team of skilled professionals designs, installs, and maintains critical building systems. While they are not primarily a residential service provider, their expertise is foundational for offices, factories, schools, and healthcare facilities throughout the region. The company's long history in Oak Creek, WI, means deep-rooted knowledge of local building codes and climate challenges, from harsh winters to humid summers.

Key Services

Grunau Company provides a connected suite of mechanical services. This integrated approach ensures different systems work together smoothly.

• HVAC Services: Installation, replacement, and repair of heating and cooling systems to manage Wisconsin's variable climate.
• Plumbing & Piping: Full plumbing services, including inspection, installation, repair, and specialized process piping for industrial needs.
• Fire Protection: A core service since 1929, covering the design and installation of systems that protect people and property.
• Gas Line Work: Safe installation and repair of gas lines for heating and industrial processes.

Areas Served

Grunau Company serves a wide area across Southeastern Wisconsin. Their service footprint includes Milwaukee, Racine, West Allis, Greenfield, and Franklin. They also work in communities like West Bend, Mequon, Watertown, Oconomowoc, Hartford, and Cedarburg. This extensive coverage demonstrates their capacity as a major regional contractor.

Company History

The story began in 1920 when Paul J. Grunau started a plumbing and repair business. Expansion came quickly, adding HVAC and piping work in 1923. A significant milestone was entering the fire protection business in 1929, a move that defined the company's future. After four generations of family leadership, Grunau Company joined the APi Group family of specialty contractors in 2006, gaining additional resources while maintaining its local operational focus in Oak Creek.

Leadership & Local Presence

Founded by Paul J. Grunau, the company's culture has always been built on hands-on expertise and community connection. Being headquartered in Oak Creek, WI, for decades means the leadership understands the local industrial and commercial landscape intimately. Their involvement goes beyond projects, contributing to the region's economic and infrastructural development.

Specialties & Highlights

Several key points set Grunau Company apart.

• Century of Experience: A track record dating to 1920 provides unmatched institutional knowledge.
• Full-Service Capability: They manage HVAC, plumbing, electrical, refrigeration, fire protection, and utilities under one roof.
• Technology Adoption: They use Building Information Modeling (BIM) to improve project planning and collaboration, reducing errors and delays.
• Industrial & Commercial Focus: Their expertise is tailored for complex, large-scale projects beyond typical home services.

Why Locals Choose Grunau Company

Businesses and institutions in Southeastern Wisconsin choose Grunau Company for a simple reason: proven performance. Their name is associated with solid work, creative problem-solving, and a customer-focused approach built on core values. The longevity of Grunau Company in Oak Creek, WI, speaks to a consistent reputation for quality and reliability. When a project demands expertise in mechanical systems and fire protection, many turn to the trusted local leader that has been serving the community for generations.