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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Lance Anderson | Uxbridge, MA | — | Designer | 27 |
| Larry Carreiro | Acushnet, MA | — | Designer | 3067 |
| Larry E. Tilton | Attleboroug, MA | — | Inspector | 2540 |
| Larry E. Tilton | North Attleboro, MA | — | Designer | 13677 |
| Laura A. Schofield | — | — | Inspector | 4711 |
| Laura A. Schofield | Orleans, MA | — | Designer | 2173 |
| Laura DelleChiaie | Peabody, MA | — | DesignerInspector | 14525 |
| Laurance M. Hayes | Woburn, MA | — | Designer | 2957 |
| Lauren Guiry | Bedford, NH | — | Designer | 14952 |
| Lauren Hache | Kingston, MA | — | DesignerInspector | 14588 |
| Lauren Kennedy | Agawam, MA | — | DesignerInspector | 14337 |
| Lauren Shea | Norwood, MA | — | Designer | 14830 |
| Lauren Usilton | — | — | Inspector | 13529 |
| Laurence B. Stone | — | — | Inspector | 13624 |
| Laurie A. Wiita | Gardner, MA | — | DesignerInspector | 13615 |
| Laurie Dutton | — | — | Inspector | 13014 |
| Lawrence A. Aubin, Jr. | — | — | Inspector | 3703 |
| Lawrence C. Greene | Princeton, MA | — | Designer | 2688 |
| Lawrence F. Page, Jr. | — | — | Inspector | 3860 |
| Lawrence J. Piazza | — | — | Inspector | 4174 |
| Lawrence J. Piazza | Foxborough, MA | — | Designer | 2701 |
| Lawrence P. Silva | — | — | Inspector | 1807 |
| Lawrence P. Silva | Bridgewater, MA | — | Designer | 2243 |
| Lawrence Perry | Beach, MA | — | Inspector | 3096 |
| Lawrence Perry | Monument Beach, MA | — | Designer | 1907 |
| Lawrence Rusiecki | Hadley, MA | — | Inspector | 3986 |
| Lawrence Rusiecki | South Hadley, MA | — | Designer | 2108 |
| Leandro Camargo | — | — | Inspector | 14332 |
| Lee D. Jarvis | — | — | Inspector | 493 |
| Lee D. Jarvis | Spencer, MA | — | Designer | 1126 |
| Lennon W. Crabtree | South Easton, MA | — | Designer | 14621 |
| Leo F. Cormier | — | — | Inspector | 4770 |
| Leo F. Cormier | Haverhill, MA | — | Designer | 445 |
| Leonard F. Potter | — | — | Inspector | 699 |
| Leonard F. Potter | Westport, MA | — | Designer | 1964 |
| Leontia Flanagan | Dedham, MA | — | DesignerInspector | 14074 |
| Lesley A. Spokas | Chesterfield, MA | — | Designer | 2310 |
| Lesley J. Ellis | — | — | Inspector | 13930 |
| Leslie Whelan | — | — | Inspector | 3832 |
| Leslie Whelan | Rockport, MA | — | Designer | 2579 |
| Lewis Tarbox | — | — | Inspector | 13541 |
| Liam Cullinane | Boston, MA | — | Designer | 14910 |
| Liam McCann | Northampton, MA | — | Designer | 15017 |
| Lily Juda | Longmeadow, MA | — | Designer | 15173 |
| Limhuot Tiv | Lowell, MA | — | Designer | 14568 |
| Lincoln Oram | Hanover, MA | — | DesignerInspector | 14901 |
| Lisa Danek Burke | — | — | Inspector | 3988 |
| Lisa Danek Burke | Rowe, MA | — | Designer | 527 |
| Lisa Daoust | — | — | Inspector | 14839 |
| Lisa McCarthy | — | — | Inspector | 3181 |
| Lori A. Desmarais | — | — | Inspector | 14634 |
| Lorri A. McCool | — | — | Inspector | 4727 |
| Lorri A. McCool | Wilbraham, MA | — | Designer | 1534 |
| Louis LaBate | — | — | Inspector | 5014 |
| Lucas Amato | Chatham, MA | — | DesignerInspector | 14604 |
| Lucas McLain | Quincy, MA | — | Designer | 15074 |
| Lucas Rotti | Barre, MA | — | DesignerInspector | 13840 |
| Lucy Conley | South Hadley, MA | — | Designer | 14366 |
| Luis Cabrera | — | — | Inspector | 15048 |
| Luis Coelho | Bedford, MA | — | Inspector | 4399 |
| Luis F. Oliveira | River, MA | — | Inspector | 4773 |
| Luke J. Roy | Reading, MA | — | Inspector | 4409 |
| Luke J. Roy | North Reading, MA | — | Designer | 2740 |
| Luke Norton | Bedford, NH | — | Designer | 13281 |
| Luke Sawelsky | — | — | Inspector | 14723 |
| Luke Showalter | Westfield, MA | — | Designer | 13700 |
| Luther C. Grant | — | — | Inspector | 2347 |
| Lynn K. Mulkeen | Marston Mills, MA | — | Designer | 1696 |
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