| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ACIES CIVIL AND STRUCTURAL LIMITED | 07195701 | 04/05/2017 | Silver |
| ATP ARCHITECTS + SURVEYORS LIMITED | 08648558 | 17/10/2019 | Bronze |
| CALIBRATE GROUP LIMITED | 12572433 | 01/04/2023 | One Red Flag |
| CALIBRATE INC LTD | 08277206 | 01/04/2023 | One Red Flag |
| CALIBRATE LEASING LIMITED | 09144170 | 01/04/2023 | One Red Flag |
| CALIBRATE MAINTENANCE LTD | 12553502 | 01/04/2023 | One Red Flag |
| CAN GEOTECHNICAL LIMITED | 04903360 | 26/10/2018 | One Red Flag |
| CAN RENEWABLES LIMITED | 12543555 | 01/04/2020 | One Red Flag |
| CAN STRUCTURES LIMITED | 04903359 | 26/10/2018 | Bronze |
| CAN UK HOLDINGS LIMITED | 04904666 | 26/10/2018 | One Red Flag |
| CEETECH LIMITED | 04242024 | 11/03/2022 | Silver |
| CENTARA LTD | 07015837 | 12/11/2021 | One Red Flag |
| CENTRAL ALLIANCE PRE CONSTRUCTION SERVICES LTD | 05769713 | 12/03/2018 | Amber |
| COPELAND WEDGE ASSOCIATES LTD | 07709882 | 05/04/2018 | Bronze |
| CS2 LIMITED | 03888977 | 30/07/2021 | Bronze |
| CUMBRIA ACCESS SERVICES LIMITED | 03366725 | 22/01/2021 | Silver |
| ENTRAINMENT LIMITED | 06245436 | 20/12/2017 | Amber |
| ENVIREAU LTD | 06647619 | 02/11/2021 | Bronze |
| FELLOWS CONSTRUCTION CONSULTANTS LTD | 08722651 | 27/04/2022 | Amber |
| FR CONSULTANTS LIMITED | 11354060 | 13/06/2022 | Amber |
| GHI RENEWABLES LIMITED | 05942386 | 10/02/2023 | One Red Flag |
| GRIDFLEX LTD | 12553336 | 01/04/2023 | Not Trading |
| IAN FARMER ASSOCIATES (1998) LIMITED | 03661447 | 27/11/2017 | Amber |
| J & A PELLING LTD | 01062334 | 17/12/2018 | Amber |
| KMGP LIMITED | 04249588 | 09/06/2017 | Amber |
| LEAP ENVIRONMENTAL LIMITED | 06552502 | 30/07/2021 | Silver |
| NON DESTRUCTIVE TESTING SERVICES LIMITED | 04560287 | 05/04/2018 | Amber |
| PELLING LIMITED | 02551068 | 17/12/2018 | Amber |
| PHAROS FIELD ENGINEERING SERVICES LIMITED | 04869285 | 16/12/2020 | Bronze |
| PHAROS GENERATOR SERVICES LIMITED | 08334792 | 16/12/2020 | One Red Flag |
| PROJECT MILNER LIMITED | 08534885 | 27/05/2022 | Silver |
| RICHARD IRVIN FM LIMITED | 11454668 | 17/02/2023 | One Red Flag |
| ROCP LIMITED | 03126673 | 06/07/2020 | Silver |
| RSK ENVIRONMENT LIMITED | SC115530 | 01/04/2012 | Silver |
| RSK GROUP LIMITED | 03761340 | 01/12/2019 | Amber |
| RSK LAND & DEVELOPMENT ENGINEERING LIMITED | 04723837 | 02/03/2022 | Amber |
| RSK ORBITAL LIMITED | 03686187 | 30/03/2021 | Bronze |
| SILCOCK LEEDHAM CONSULTING ENGINEERS LIMITED | 07363770 | 29/11/2019 | One Red Flag |
| SILCOCK LEEDHAM GROUP LTD | 07470740 | 29/11/2019 | Silver |
| SKYVISION INTERNATIONAL LIMITED | SC153156 | 30/03/2021 | Amber |
| SONIC DRILLING & PILING PLANTHIRE LIMITED | 07981593 | 30/06/2021 | Amber |
| TECHNIK GROUND SOLUTIONS LIMITED | 07874856 | 30/06/2021 | Silver |
| TRAVIS BAKER LIMITED | 05703678 | 06/10/2022 | Bronze |
| UP AND UNDER (SPECIALIST CONTRACTS) LIMITED | 03588412 | 20/12/2017 | Amber |
| UP AND UNDER GROUP LIMITED | 05435793 | 20/12/2017 | One Red Flag |
| UP AND UNDER LIMITED | 02434409 | 20/12/2017 | Bronze |
| WINDTECHS LTD | 06369650 | 29/04/2022 | Amber |
| ZERO ENERGY DESIGN LTD | 05815068 | 29/11/2019 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CAN LIMITED | 06664140 | 26/10/2018 | 11/06/2021 | Not Trading |
| CAN LONDON LIMITED | 04903485 | 26/10/2018 | 11/06/2021 | Not Trading |
| CENTARA BUREAU SERVICES LTD | 07819679 | 12/11/2021 | 03/06/2024 | Dissolved |
| CENTARA ENGINEERING SERVICES LTD | 10862027 | 12/11/2021 | 03/06/2024 | Dissolved |
| CENTARA GROUP LTD | 08120950 | 12/11/2021 | 17/04/2024 | Dissolved |
| CENTRAL ALLIANCE (HOLDINGS) LIMITED | 08887003 | 12/03/2018 | 11/06/2021 | One Red Flag |
| GEOTECHNICAL & STRUCTURAL SERVICES (HOLDINGS) LIMITED | 09730275 | 27/11/2017 | 11/06/2021 | Dissolved |
| GEOTECHNICAL AND STRUCTURAL SERVICES LIMITED | 08388127 | 27/11/2017 | 11/06/2021 | Dissolved |
| PHAROS POWER SUPPORT GROUP LIMITED | 13044906 | 16/12/2020 | 07/03/2024 | Dissolved |
| RSK STATS LIMITED | 02833839 | 19/12/2007 | 11/06/2021 | Dissolved |
| TRAVIS BAKER (HOLDINGS) LTD | 08922122 | 06/10/2022 | 17/04/2024 | Dissolved |
| TRAVIS BAKER EAST MIDLANDS LIMITED | 10239686 | 06/10/2022 | 11/06/2024 | Strike Off |
| TRAVIS BAKER GEO-ENVIRONMENTAL LIMITED | 09453821 | 06/10/2022 | 11/06/2024 | Strike Off |
| VERISYS LIMITED | 07126271 | 29/11/2019 | 11/04/2022 | Gold |