Below is a list of signatory contractors with Sheet Metal Workers Local 63.
- Bonner Sheet Metal—310 Southwest Cut-off, Worcester, MA 01604
- Carl Fisher Co., Inc.—42 Wilcox Street, Springfield, MA 01105
- Dobbert Heating & Air Conditioning—558 Union St. North Adams, MA 01247
- Fab-Tech, Inc.—480 Hercules Drive, Colchester, VT 05446
- GDS Manufacturing, Inc.—67 Chad Lane, Williston, VT 05495
- Greenwood Industries—50 Howe Avenue, Millbury, MA 01527
- J. D. Rivet Co.—P.O. Box 168, Indian Orchard, MA 01151
- LAB Co.—P.O. Box 284, Feeding Hills, MA 01030
- Kleeberg Sheet Metal—65 Westover Road, Ludlow, MA 01056
- M & W Heating Inc.—188 Hubbard Avenue, Pittsfield, MA 01201
- Milharmer Associates, Inc.—534 New State Highway Suite 3, Raynham, MA 02767
- Modernized Architechtural Sheet Metal—243 Stafford Street, Worcester, MA 0160
- Moran Sheet Metal-613 Meadow Street, Agawam, MA 01001
- Northeast Heating & A/C, Inc.—97 Boyer Circle, Williston, VT 05495
- Performance Testing and Balancing LLC—282 Fomer Road, Southampton, MA 01073
- Pittsfield Pipers, Inc.—73 Fourth Street, Pittsfield, MA 01201
- Royal Steam Heater Co.— 499 Main Street, Gardner, MA 0144
- Titan Roofing Inc.—200 Tapley Street, Springfield, MA 01104
- Titan Roofing Inc.—165 Harding Street, Worcester, MA 01604
- United McGill Corp.—452 Harwood Hill Rd. Bennington, VT 05201
- U. S. Test & Balance—10 Corporate Park Dr. Hopewell Junction, NY 12533
- William F. Lynch Co., Inc.—50 Millbrook Street, Worcester, MA 01606
- Worcester Air Conditioning—148 Pleasant Street, Ashland, MA 01721
- Yankee Sheet Metal, Inc.—35 Wrobel Place, East Hartford, CT 06108