| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| 1ST INRAIL LIMITED | 06252002 | 24/05/2023 | Amber |
| AFFORDABLE SKIP HIRE BRISTOL LIMITED | 07687650 | 11/07/2023 | Amber |
| BATEMAN SKIPS LTD | 04934307 | 11/07/2023 | Silver |
| C.J. ASSOCIATES GEOTECHNICAL LIMITED | 01544609 | 08/03/2018 | One Red Flag |
| C.R. CIVIL ENGINEERING LIMITED | 03950591 | 02/03/2021 | Bronze |
| CENTRAL ALLIANCE (HOLDINGS) LIMITED | 08887003 | 29/09/2021 | Amber |
| CENTRAL ALLIANCE PRE CONSTRUCTION SERVICES LTD | 05769713 | 31/01/2020 | One Red Flag |
| CRCE PLANT LIMITED | 10408804 | 02/03/2021 | One Red Flag |
| DEANS CIVIL ENGINEERING LIMITED | SC378926 | 09/10/2023 | Silver |
| DEANS DEVELOPMENTS (KILBARCHAN) LTD | SC744357 | 09/10/2023 | Amber |
| DEANS HOLDCO LIMITED | SC783027 | 09/10/2023 | Silver |
| DRILLING SUPPLIES UK LIMITED | 06045403 | 29/03/2019 | One Red Flag |
| DYNAMIC SAMPLING UK LIMITED | 04143018 | 27/04/2016 | One Red Flag |
| ECOLOGIA ENVIRONMENTAL SOLUTIONS HOLDINGS LIMITED | 07330158 | 11/09/2019 | One Red Flag |
| ECOLOGIA ENVIRONMENTAL SOLUTIONS LIMITED | 03951107 | 11/09/2019 | One Red Flag |
| ELECTROKINETIC LIMITED | 04183422 | 31/08/2021 | Amber |
| ENVIROLAB LIMITED | 04487136 | 02/12/2002 | One Red Flag |
| GEOCORE SITE INVESTIGATIONS LIMITED | 04042825 | 09/08/2019 | One Red Flag |
| GLOBAL RAIL CONSTRUCTION LIMITED | 04272798 | 07/09/2023 | Silver |
| HOLLYWOOD CIVIL ENGINEERING LIMITED | 06726914 | 26/09/2022 | Bronze |
| JB SITE INVESTIGATIONS LIMITED | 10057964 | 01/06/2016 | One Red Flag |
| MSS CONSULTING LIMITED | 05554672 | 10/06/2022 | Amber |
| MSS ENVIRONMENTAL LTD | 05554682 | 10/06/2022 | Amber |
| MSS FACILITIES SERVICES LTD | 05539272 | 10/06/2022 | One Red Flag |
| MSS GROUP LIMITED | 05486864 | 10/06/2022 | Amber |
| MSS WATER LIMITED | 04370657 | 10/06/2022 | Amber |
| PA GROUP (UK) LIMITED | 06257126 | 06/07/2020 | One Red Flag |
| PB DRILLING LIMITED | 11533592 | 01/10/2018 | One Red Flag |
| R.J.T. EXCAVATIONS LIMITED | SC118090 | 17/08/2023 | Gold |
| REMEDX LIMITED | 05044531 | 01/08/2011 | Amber |
| RSK ENVIRONMENT LIMITED | SC115530 | 03/06/2021 | Amber |
| RSK GROUP LIMITED | 03761340 | 01/12/2019 | Amber |
| RSK INTEGRATED WASTE SOLUTIONS LIMITED | 13412469 | 20/05/2021 | One Red Flag |
| RSK RAW LIMITED | 12071477 | 26/06/2019 | One Red Flag |
| SONIC DRILLING & PILING PLANTHIRE LIMITED | 07981593 | 30/06/2021 | Gold |
| STRUCTURAL SOILS LIMITED | 00828694 | 01/10/2011 | One Red Flag |
| TARPAVE LIMITED | SC240089 | 09/10/2023 | Amber |
| TECHNIK GROUND SOLUTIONS LIMITED | 07874856 | 30/06/2021 | Amber |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CAN GEOTECHNICAL LIMITED | 04903360 | 03/02/2022 | 24/09/2024 | One Red Flag |
| CAN STRUCTURES LIMITED | 04903359 | 03/02/2022 | 24/09/2024 | One Red Flag |
| CARBON ZERO CONSULTING LTD | 03320795 | 30/09/2021 | 24/09/2024 | One Red Flag |