| A&L Heating and Plumbing Ltd | Builders | CF81 9DS | 2024 |
| A1 Zero Carbon Ltd | Builders | CF48 2SR | 2024 |
| Ace Property Investments Ltd | Builders | CF48 3SS | 2006 |
| Adfercymru Ltd | Builders | CF48 4QA | 2021 |
| Adrian Davies Kitchen Fitting Ltd | Builders | CF81 8JX | 2019 |
| Amber & Ruby Developments Ltd | Builders | CF48 2SR | 2017 |
| Andrew Good Construction Services Ltd | Builders | CF81 8NY | 2017 |
| Aztec Holdings Rhymney Ltd | Builders | CF81 8RA | 2026 |
| B.L. Rigging Ltd | Builders | CF81 9EG | 2022 |
| Beacons Group Ltd | Builders | CF48 2SR | 2024 |
| Breconshire Construction Ltd | Builders | CF48 2EE | 2013 |
| Brickfitz Ltd | Builders | CF48 4SZ | 2024 |
| C3 Construction Services Ltd | Builders | CF48 2DN | 2018 |
| Cheeke Jones Building Services Ltd | Builders | CF48 2EB | 2025 |
| Chris Tasker Construction Ltd | Builders | CF48 4LT | 2025 |
| Cld Builders Ltd | Builders | CF48 2TN | 2026 |
| Cocosteli Construction Ltd | Builders | CF48 3SN | 2025 |
| Coombs Contractors Ltd | Builders | CF81 9FW | 2015 |
| Cpa Construction Services Ltd | Builders | CF48 1RA | 2026 |
| Cultrigging Ltd | Builders | CF81 8JW | 2026 |
| Ddsk Developments Ltd | Builders | CF48 4TQ | 2019 |
| Dizzy Heights Access Solutions Ltd | Builders | CF48 2SR | 2014 |
| Dlm Groundwork Contractors Ltd | Builders | CF48 4PU | 2025 |
| Door Centre South Wales Ltd | Builders | CF48 2TN | 2025 |
| Drec Building Ltd | Builders | CF48 4EX | 2014 |
| Drs Groundworks Ltd | Builders | CF81 9FL | 2005 |
| Ecas Group Ltd | Builders | CF48 2PG | 2025 |
| Eco Building Compliance UK Ltd | Builders | CF48 1BW | 2023 |
| Elite Vinyl Wraps Ltd | Builders | CF48 2TN | 2026 |
| Envision Contractors Ltd | Builders | CF48 2AU | 2023 |
| Exterior Essentials Ltd | Builders | CF81 9AB | 2026 |
| Fear & Law Properties Ltd | Builders | CF48 3HF | 2024 |
| Ffrind Developments Ltd | Builders | CF48 4TQ | 2016 |
| Flec Construction Ltd | Builders | CF48 4QP | 2026 |
| G Caswell Services Ltd | Builders | CF48 3LD | 2018 |
| G Curtis Rail Ltd | Builders | CF48 1TW | 2017 |
| G R Jones Brickwork Ltd | Builders | CF81 8LX | 2016 |
| Gerwyn Davies & Daughter Ltd | Builders | CF48 2ER | 2024 |
| Giles & Sons Rail Ltd | Builders | CF48 2ED | 2016 |
| Gth Consrtuction (Wales) Ltd | Builders | CF48 1BS | 2014 |
| Hareva Construction Ltd | Builders | CF48 2SR | 2019 |
| Home & Dry (Merthyr Tydfil) Ltd | Builders | CF48 2SR | 2007 |
| J E Management Ltd | Builders | CF48 2RW | 2016 |
| James Cox Home Improvements Ltd | Builders | CF81 8JA | 2026 |
| Jgh Construction Solutions Ltd | Builders | CF48 4PH | 2026 |
| Jk Carpentry and General Building Ltd | Builders | CF81 9BF | 2024 |
| Jodan Contracts Ltd | Builders | CF48 2SR | 2015 |
| Jones Building Ltd | Builders | CF48 4JA | 2017 |
| K.C Groundworks & Civils Ltd | Builders | CF48 1JN | 2021 |
| Kelray Ltd | Builders | CF48 4DR | 1998 |
| Laines Group Ltd | Builders | CF81 9AG | 2024 |
| Launch Fly Capture Technologies Ltd | Builders | CF48 2NU | 2018 |
| Laystone Construction Ltd | Builders | CF48 4LT | 2017 |
| Lewis Falkiner Properties Ltd | Builders | CF48 3TD | 2016 |
| Lightweight Roofing & Building Solutions Ltd | Builders | CF48 1TJ | 2019 |
| Llc Services Ltd | Builders | CF48 4TQ | 2019 |
| Logantroyrail Ltd | Builders | CF48 4DJ | 2024 |
| Louwis Groundworks Ltd | Builders | CF48 1LN | 2018 |
| Lrm Maintenance and Construction Ltd | Builders | CF48 3RR | 2019 |
| Luke Dummett Bricklaying Ltd | Builders | CF48 1RZ | 2016 |
| Lw Housing Refurbishments Ltd | Builders | CF48 2DW | 2018 |
| M & S Roller Shutter Doors Ltd | Builders | CF48 2SR | 2008 |
| M Higgins Services Ltd | Builders | CF48 1SB | 2019 |
| M Pope Building Services Ltd | Builders | CF81 9QN | 2007 |
| M W Barry Ltd | Builders | CF48 2TN | 2026 |
| M. Delacey & Sons (Holdings) Ltd | Builders | CF48 3TD | 1994 |
| M.E.R.S. Holdings Ltd | Builders | CF48 1RY | 2022 |
| Mac Construction and Groundworks Ltd | Builders | CF81 8NL | 2018 |
| Maintenance Matters Merthyr Ltd | Builders | CF48 2SR | 2026 |
| Matcon Civil Engineering Ltd | Builders | CF48 4NL | 2010 |
| Matcon Plant Ltd | Builders | CF48 4NL | 2021 |
| Mgr Civils Ltd | Builders | CF48 1SP | 2020 |
| Millennial Groundworks Ltd | Builders | CF48 2DS | 2022 |
| Minerva Construction (UK) Ltd | Builders | CF48 3NY | 2017 |
| Mj 93 Construction Ltd | Builders | CF48 2DH | 2019 |
| Mrb Global Ltd | Builders | CF81 9AQ | 2026 |
| Msw Property Developments Ltd | Builders | CF48 4DR | 2024 |
| N Dudley Services Ltd | Builders | CF48 3LA | 2019 |
| Nld Rail Tech Ltd | Builders | CF81 9BB | 2025 |
| Oz Tech Services Ltd | Builders | CF48 2PS | 2018 |
| P & C Building & Management Solutions Ltd | Builders | CF48 2SR | 2016 |
| Phoenix Fencing & Construction Ltd | Builders | CF48 4DR | 2021 |
| Platinum Carpentry & Roofing Ltd | Builders | CF48 3TD | 2025 |
| Powell Construction Services Ltd | Builders | CF81 8PE | 2018 |
| Price Fencing & Landscaping Ltd | Builders | CF48 2SD | 2002 |
| Price Fencing Management Ltd | Builders | CF48 2SD | 2014 |
| Price Home Developments Ltd | Builders | CF48 1BB | 2023 |
| Price Pro-Construct Ltd | Builders | CF48 1BB | 2020 |
| Primefix Property Services Ltd | Builders | CF81 8PA | 2026 |
| Qdl Contractors Ltd | Builders | CF48 4DR | 2007 |
| R M Andrews Brickwork Ltd | Builders | CF81 8NW | 2010 |
| Rd Construction & Maintenance Ltd | Builders | CF48 4DR | 2018 |
| Rgj Building Services Ltd | Builders | CF48 1NJ | 2015 |
| Rici Ltd | Builders | CF48 4HE | 2019 |
| Ridgestone Construction Ltd. | Builders | CF48 4RG | 2012 |
| S & R Carpentry & Building Ltd | Builders | CF48 3HG | 2008 |
| S R Building Solutions Ltd | Builders | CF48 2SR | 2007 |
| S Williams Electrical Services Ltd | Builders | CF48 1RE | 2026 |
| Sd James Construction Ltd | Builders | CF81 9EP | 2010 |
| Shj Carpentry and Building Maintenance Ltd | Builders | CF81 9EF | 2023 |
| Silveroak Building Solutions Ltd | Builders | CF48 1RH | 2024 |
| Smart Mechanical Engineering Ltd | Builders | CF48 3TD | 2023 |
| Surfacing Specialist Ltd | Builders | CF81 9PA | 2022 |
| Sussex Fencing Services Ltd | Builders | CF48 1RY | 2006 |
| Sutty Slabing Ltd | Builders | CF48 1JY | 2017 |
| Taylors Construction Services Ltd | Builders | CF48 1TP | 2021 |
| The Atlas Group Sw Ltd | Builders | CF81 9FE | 2026 |
| The Contracting Group Ltd | Builders | CF48 2NS | 2019 |
| Tier 1 Construction Services Ltd | Builders | CF48 2SR | 2019 |
| Tommie’S Timbers Ltd | Builders | CF48 1RX | 2023 |
| Vale Crw Ltd | Builders | CF48 2SR | 2019 |
| Valleys Resin Ltd | Builders | CF48 1YF | 2024 |
| Watkins Pts Ltd | Builders | CF81 8QT | 2024 |
| Will-Mor Groundwork Specialists Ltd | Builders | CF48 4ND | 2021 |
| Williams Carpentry & Building Contractors Ltd | Builders | CF81 8LT | 2007 |
| Woodtech Construction Ltd | Builders | CF48 1BF | 2023 |
| Z Zawijskyj Services Ltd | Builders | CF48 2EH | 2018 |