Guardian Plumbing & Heating
Our Story

About Us

Guardian Plumbing & Heating, Inc. located in Livonia, Michigan is one of the Detroit area’s leading full-service plumbing contractors for healthcare, commercial, and institutional service. As a second-generation business with over 40 years experience, we offer excellent craftsmanship and outstanding service.

Our licensed plumbing personnel install and maintain all types of plumbing systems from healthcare facilities, high rise office buildings, apartment complexes, schools, and industrial plants to the simplest renovation or repair of any type of plumbing, piping, or heating system.

Guardian Plumbing & Heating was established in 1968 as a service company by Andy D’Ascenzo. His goal was to deliver a quality product with good service at a fair price.

Our first customer was the Metropolitan Hospitals, which was later purchased by Henry Ford Health Systems and remains a customer to this day.

As we grew, healthcare and high-rise buildings became our primary customers. This market expects quality and good service and we rose to the occasion, growing our business every year.

Andy sons, Gary, Tony, and Brian followed in his footsteps becoming master plumbers and helped to take the company into the future.

With the loss of its founder in 1984, the reins of the company were passed to Tony D’Ascenzo. Through his leadership, the company opened a construction division which has worked in every major hospital system in southeastern Michigan. In 1990, Andy’s fourth son, Larry D’Ascenzo, joined the company as a marketing manager for the service division. Since then, Guardian’s client-base consists of companies as large as General Motors to small single-building owners.

Our Customers

Delivering cost-effective solutions in plumbing and heating projects is a Guardian Plumbing & Heating specialty.

Beaumont Hospital, Troy
Beaumont Hospital, Royal Oak
Beaumont Hospital, Gross Pointe
Bostford Hospital, Farmington Hills
DMC Children’s Hospital of Michigan, Detroit
DMC Harper University Hospital, Detroit
DMC Hutzel Women’s Hospital, Detroit
DMC Detroit Receiving Hospital, Detroit
DTE Energy, various locations
Henry Ford Hospital, Detroit
Henry Ford Hospital, West Bloomfield
Henry Ford Medical Center, Gross Pointe Farms
Henry Ford Kingswood Hospital, Ferndale
Garden City Hospital, Garden City
General Motors Renaissance Center

Karmanos Cancer Institute, Detroit
Karmanos Cancer Institute, Farmington Hills
Karmanos Cancer Institute, Southfield
Michigan Orthopedic Specialty Hospital, Madison Heights
Mott Children’s Hospital, Ann Arbor
Oakland Community College, various locations
Oakwood Hospital & Medical Center, Dearborn
Oakwood Southshore Medical Center, Trenton
Oakwood, Heritage Hospital, Taylor
Oakwood, Annapolis Hospital, Wayne
Pontiac Osteopathic Hospital, Pontiac
St. John Providence Hospital, Southfield
St John Providence Park Medical Center & Hospital, Novi
St John Macomb-Oakland Hospital, Warren
St John Hospital & Medical Center, Detroit

St John Hospital & Medical Center, North Shore Campus
St John River District Hospital
St Mary Mercy Hospital
St Joseph Mercy Hospital, Ann Arbor
St Joseph Mercy Hospital, Livingston
St Joseph Mercy Hospital, Saline
St Joseph Mercy, Chelsea Community Hospital
St Joseph Mercy, Woodland Cancer Center, Brighton
St Joseph Mercy Hospital, Macomb
St Joseph Mercy Hospital, Oakland
University of Michigan, Ann Arbor
University of Michigan Hospital, Ann Arbor
VA Hospital of Detroit
VA Hospital of Ann Arbor
Wayne State University