Contact Us



Our Address

1630 E. Francis Street Suite A
Ontario, Ca. United States, 91761


Our Phone Number

Phone: 1-909-393-0186
Fax : 1-909-947-7797


Email Us

Lorraine Hammer: lori@masterbuilding.com

Master Building Specialties Inc.: MBS1630@gmail.com


Operating Hours

Monday - Friday | 8:30 am - 5:00 pm

Saturday - Sunday | Closed