| Construction Simon Cousineau (2003) inc. | 5730-6797-01 | Laurentides | Active |
| Construction Simon Napert inc. | 5750-3401-01 | Chaudière-Appalaches | Active |
| Construction Sipro Inc. | 1846-1400-58 | Mauricie | Active |
| Construction Sky inc. | 5769-7484-01 | Laurentides | Active |
| Construction Smith inc. | 5631-7233-01 | Estrie | Active |
| Construction Socam Ltée | 2443-5307-32 | Laval | Active |
| Construction Solide-R inc. | 8299-9517-24 | Mauricie | Active |
| Construction Solidex (2008) inc. | 8356-5309-52 | Montérégie | Active |
| Construction Spedec inc. | 2595-8810-52 | Capitale-Nationale | Active |
| Construction St-Maxim inc. | 8359-9993-01 | Lanaudière | Active |
| Construction Steeve Arbour inc. | 8354-9113-09 | Capitale-Nationale | Active |
| Construction Stef. M. inc | 5676-0374-01 | Bas-Saint-Laurent | Active |
| Construction Stéphane Dagenais inc. | 8285-2153-07 | Laurentides | Active |
| Construction Stephane Frechette inc. | 2862-7446-60 | Estrie | Active |
| Construction Stéphane Landry inc. | 8000-9327-48 | Montérégie | Active |
| Construction Stéphane Lebeau Inc. | 8274-3238-18 | Laurentides | Active |
| Construction Stéphane Munger inc. | 5670-8399-01 | Montérégie | Active |
| Construction Stéphane Théroux inc. | 8235-2196-29 | Centre-du-Québec | Active |
| Construction Steve Baron inc. | 8311-6053-18 | Lanaudière | Active |
| Construction Steve Dufresne inc. | 8329-7192-02 | Laurentides | Active |
| Construction Steve Maheux Inc. | 3082-6341-56 | Laval | Active |
| Construction Styves Le Général inc. | 8351-5494-24 | Lanaudière | Active |
| Construction SXB Inc. | 5683-2645-01 | Laval | Active |
| Construction SY.B Inc. | 5705-9354-01 | Saguenay--Lac-Saint-Jean | Active |
| Construction Syber S.J. inc. | 5688-3572-01 | Laurentides | Active |
| CONSTRUCTION SYLVAIN CÔTÉ INC. | 5599-9569-01 | Montréal | Active |
| Construction Sylvain Martel Inc. | 5585-2941-01 | Montérégie | Active |
| Construction Sylvain Mathieu inc | 8343-2955-30 | Laurentides | Active |
| Construction Sylvain Nadeau inc. | 5604-2138-01 | Lanaudière | Active |
| Construction Sylvain Paradis inc. | 8318-2626-36 | Laurentides | Active |
| Construction Sylvain Tremblay inc. | 2944-9493-08 | Capitale-Nationale | Active |
| Construction Sylvain Vaudreuil inc. | 2755-8113-50 | Lanaudière | Active |
| Construction Sylvania Inc. | 1474-5871-93 | Montérégie | Active |
| Construction Sylvatech inc. | 5606-1401-01 | Estrie | Active |
| Construction Tassoni Inc. | 1285-7538-90 | Montréal | Active |
| Construction Tavi inc. | 5805-8652-01 | Montréal | Active |
| Construction Techni-Bois inc. | 8249-4311-03 | Laval | Active |
| Construction Telva inc. | 5736-4374-01 | Montréal | Active |
| Construction Tesserac inc. | 8333-1926-57 | Montréal | Active |
| Construction Tétreauclair inc. | 5760-0215-01 | Montérégie | Active |
| Construction Thathion inc. | 8310-3218-36 | Montréal | Active |
| Construction Thiery Lampron Inc. | 8335-6428-41 | Centre-du-Québec | Active |
| Construction Thivierge inc. | 2525-7445-94 | Lanaudière | Active |
| Construction Tisserins inc. | 8337-3936-29 | Montérégie | Active |
| Construction Toulon Quebec (1986) inc. | 2438-2012-13 | Montréal | Active |
| Construction Toupin inc. | 8290-5118-54 | Montérégie | Active |
| Construction Transit 2E G Ltée | 5655-1534-01 | Laval | Active |
| Construction Trilikon Construction inc. | 1952-2895-98 | Montréal | Active |
| Construction Triselect Inc. | 5753-4166-01 | Montréal | Active |
| Construction Turco inc. | 2861-8841-03 | Estrie | Active |