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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Wade A. Stanley | Norwell, MA | — | DesignerInspector | 14123 |
| Walter B. Hermenau | — | — | Inspector | 4545 |
| Walter B. Hermenau | Assonet, MA | — | Designer | 2769 |
| Walter Conte | — | — | Inspector | 3125 |
| Walter Hewins Iv | Falls, MA | — | Inspector | 14093 |
| Walter T. Chaffee | — | — | Inspector | 14255 |
| Warren E. Grant | — | — | Inspector | 2346 |
| Warren R. Pearce, Jr. | Reading, MA | — | Inspector | 1959 |
| Wayne Keefner | Waltham, MA | — | Designer | 1189 |
| Weiyuan Sun | Ayer, MA | — | DesignerInspector | 14191 |
| Wendy Hansbury | Rockport, MA | — | Designer | 1003 |
| Wendy Lee Routhier | — | — | Inspector | 4466 |
| Will Schkuta | Danvers, MA | — | Designer | 14030 |
| William A. Coyle | — | — | Inspector | 715 |
| William A. Coyle | Leicester, MA | — | Designer | 473 |
| William A. Shaheen | — | — | Inspector | 1264 |
| William A. Shaheen | Granby, MA | — | Designer | 2199 |
| William Burnham | Amesbury, MA | — | Designer | 14752 |
| William Connelly | Lakeville, MA | — | Designer | 14360 |
| William D. Hannigan | — | — | Inspector | 1402 |
| William D. Hannigan | Leominster, MA | — | Designer | 1001 |
| William Doyle | — | — | Inspector | 3582 |
| William Doyle | Waltham, MA | — | Designer | 620 |
| William E. Gottwald, Jr. | — | — | Inspector | 5044 |
| William E. Gottwald, Jr. | Berkley, MA | — | Designer | 914 |
| William E. Murray | — | — | Inspector | 2106 |
| William E. Murray | Littleton, MA | — | Designer | 1723 |
| William G. Holt | — | — | Inspector | 832 |
| William G. Holt | Merrimac, MA | — | Designer | 1083 |
| William G. Schulze | Townsend, MA | — | Inspector | 2006 |
| William H. Blakemore | Bedford, MA | — | Inspector | 366 |
| William Hackett | — | — | Inspector | 14435 |
| William Hall | Andover, MA | — | Designer | 13592 |
| William Halsing | — | — | Inspector | 1993 |
| William Halsing | Mendon, MA | — | Designer | 2823 |
| William J. Barrett | Hanover, MA | — | DesignerInspector | 14097 |
| William J. Brookings | — | — | Inspector | 4808 |
| William J. Brookings | Westford, MA | — | Designer | 253 |
| William J. Gilpin Jr. | Bay, MA | — | Inspector | 4000 |
| William J. Maloney, Jr. | Shrewsbury, MA | — | DesignerInspector | 13704 |
| William J. McGovern | Pembroke, MA | — | Designer | 1549 |
| William M. Austin | Haven, MA | — | Inspector | 3464 |
| William M. Austin | Vineyard Haven, MA | — | Designer | 50 |
| William M. Clougherty | Webster, MA | — | Designer | 402 |
| William Matt | — | — | Inspector | 13107 |
| William McNeice | — | — | Inspector | 14447 |
| William Murphy | — | — | Inspector | 4760 |
| William Murphy | Needham, MA | — | Designer | 1718 |
| William P. Drexel | — | — | Inspector | 4839 |
| William P. Drexel | Clarksville, TN | — | Designer | 624 |
| William P. Kenney | Middleboro, MA | — | Designer | 14035 |
| William Paglia | Faltmouth Ma, NJ | — | Designer | 15098 |
| William R. Buckley Jr. | — | — | Inspector | 980 |
| William R. Buckley Jr. | Foxborough, MA | — | Designer | 266 |
| William R. Dufresne | — | — | Inspector | 2565 |
| William R. Dufresne | Andover, MA | — | Designer | 640 |
| William R. Harvey | Falmouth, MA | — | Inspector | 3107 |
| William R. Hickey, Jr. | — | — | Inspector | 2148 |
| William R. Howe | Wilmington, MA | — | Designer | 15036 |
| William R. Maher | — | — | Inspector | 851 |
| William R. Maher | Lynn, MA | — | Designer | 1458 |
| William R. Shaw | — | — | Inspector | 1220 |
| William R. Shaw | Plymouth, MA | — | Designer | 2208 |
| William Rodenhiser | — | — | Inspector | 13059 |
| William Simmons | Somerville, MA | — | Designer | 14606 |
| Winston Steadman Ii | — | — | Inspector | 13045 |
| Wolfgang Kirstein | Arlington, MA | — | Designer | 15034 |
| Wyatt J. Alm | Rivers, MA | — | Inspector | 14169 |
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