| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | L.I. Combs & Sons Inc. | Construction company | 1 |
| 2 | L.Priori | Construction company | 24 |
| 3 | L.T. Mensch | Construction company | 2 |
| 4 | La Maquinista Terrestre y Marítima | Construction company | 1 |
| 5 | La Marina Construcciones | Construction company | 1 |
| 6 | Labat Construtora e Incorporadora Ltda. | Construction company | 4 |
| 7 | Laca Construções | Construction company | 1 |
| 8 | Läer + Rahenbrock GmbH & Co. KG | Construction company | 1 |
| 9 | Lafem Engenharia | Construction company | 2 |
| 10 | Lagan Specialist Contracting | Construction company | 2 |
| 11 | Lagerwey Windmaster BV | Construction company | 1 |
| 12 | Laguna | Construction company | 3 |
| 13 | Laguna Construtora e Incorporadora | Construction company | 4 |
| 14 | Laham George - Investments & Construction Ltd. | Construction company | 1 |
| 15 | Lahmann & Co. | Construction company | 2 |
| 16 | Lakeview Construction Inc | Construction company | 0 |
| 17 | Landmarc Construction | Construction company | 2 |
| 18 | Landmark Property Services Inc. | Construction company | 0 |
| 19 | Landmark Structures | Construction company | 2 |
| 20 | Landmark Tower Company | Construction company | 3 |