| 629 Clydach Road Ltd | Builders | SA7 0AJ | 2017 |
| A H I Trading Ltd | Builders | SA1 2JQ | 2015 |
| A P Architecture and Planning Ltd | Builders | SA7 0AJ | 2010 |
| A.Beynon Agri Envirocon Ltd | Builders | SA1 3HJ | 2011 |
| A1 Resin Ltd | Builders | SA7 9FP | 2020 |
| Abc Building Ltd | Builders | SA1 6NW | 2025 |
| Abc Home Care and Improvements Ltd | Builders | SA1 4JW | 2019 |
| Abc Wales Icf Ltd | Builders | SA1 4DQ | 2018 |
| Abt Property Maintenance Ltd | Builders | SA1 6PE | 2025 |
| Abz Carpentry Ltd | Builders | SA1 5QF | 2004 |
| Aerial Optics Ltd | Builders | SA1 1PL | 2016 |
| Afs Sprinklers Ltd | Builders | SA1 5QF | 2026 |
| Aj Bespoke Carpentry Ltd | Builders | SA7 0AJ | 2024 |
| Aldeco Ltd | Builders | SA7 0AJ | 2018 |
| Alpine Mechanical Ltd | Builders | SA1 2JA | 2018 |
| Amarok Building Services Ltd | Builders | SA7 0AJ | 2022 |
| Andrew D'Auria Solutions Ltd | Builders | SA1 2JT | 2010 |
| Apex Exterior Transformations Ltd | Builders | SA1 2HY | 2025 |
| Architectural Cleaning Services Ltd | Builders | SA1 7DA | 2010 |
| Arthur Reginald Construction Ltd | Builders | SA7 9FS | 2023 |
| Artisan Contractors Ltd | Builders | SA1 3PP | 2021 |
| Asbri Transport Ltd | Builders | SA1 1NW | 2011 |
| Asw Property Services Ltd | Builders | SA7 9FS | 2000 |
| Atr Property Services Ltd | Builders | SA7 9LE | 2025 |
| Aurora Energy Consulting Ltd | Builders | SA7 9LA | 2020 |
| Avid Construction Ltd | Builders | SA7 9BD | 2004 |
| Aysusa Group Ltd | Builders | SA1 8PA | 2023 |
| B&C Building (Swansea) Ltd | Builders | SA7 9FP | 2026 |
| Barness Building Services Ltd | Builders | SA1 3PP | 2024 |
| Bay Carpentry Ltd | Builders | SA1 4EH | 2023 |
| Bay Insulation and Loft Boarding Ltd | Builders | SA1 4DG | 2026 |
| Bay Quantity Surveyors Ltd | Builders | SA1 8FF | 2022 |
| Bayside Construction (Swansea) Ltd | Builders | SA1 8EF | 2024 |
| Bedrich Homes Ltd | Builders | SA7 0AJ | 2024 |
| Bespoke Construction & Plastering Ltd | Builders | SA7 0AJ | 2024 |
| Bespoke Solid Surface Worktops and Counters Ltd | Builders | SA1 3HJ | 2015 |
| Bishops Stone Ltd | Builders | SA1 3HA | 2025 |
| Bjt Maintenance Ltd | Builders | SA1 1FY | 2019 |
| Br Joinery Ltd | Builders | SA7 9LA | 2022 |
| Broadoak Conservatory Conversions Ltd | Builders | SA1 5QF | 2021 |
| Broadstone Construction (Swansea) Ltd | Builders | SA7 0AJ | 2012 |
| Budget Builders 2 Ltd | Builders | SA1 8NP | 2020 |
| Cabs Industrial Ltd | Builders | SA1 7DA | 2018 |
| Cabs Refurbishment Ltd | Builders | SA1 7DA | 2018 |
| Cabs Repairs Ltd | Builders | SA1 7DA | 2018 |
| Calon Construction Ltd | Builders | SA7 0AJ | 2014 |
| Caradog Landscapes Ltd | Builders | SA7 0AJ | 2016 |
| Castell Civils Ltd | Builders | SA7 0AP | 2024 |
| Castell Construction Ltd | Builders | SA7 0AP | 2019 |
| Ccm Swansea Ltd | Builders | SA1 2NF | 2026 |
| Cdaa Services Ltd | Builders | SA7 9EQ | 2023 |
| Cdl Building and Carpentry Ltd | Builders | SA7 0AJ | 2013 |
| Cgl Contracts Ltd | Builders | SA1 5QF | 2020 |
| Cgl Services Ltd | Builders | SA1 5QF | 2021 |
| Chapel Developments (Pembroke) Ltd | Builders | SA7 9FG | 2014 |
| Cjwr Construction Ltd | Builders | SA7 0AJ | 2024 |
| Claire'S Rpl Ltd | Builders | SA1 8DB | 2026 |
| Cmo Building and Landscaping Ltd | Builders | SA1 8DR | 2026 |
| Coastal Construction Services Ltd | Builders | SA1 2EJ | 2016 |
| Coatings and Blasting Services Ltd | Builders | SA1 7DA | 2012 |
| Colin Bowen Water Services Ltd | Builders | SA1 3PP | 2012 |
| Cowling Holdings Ltd | Builders | SA7 0AJ | 2020 |
| Craig Las Group Ltd | Builders | SA1 3HJ | 2020 |
| Crest Ceilings & Partitions Ltd | Builders | SA7 9FS | 2011 |
| Crown Building Contractors Ltd | Builders | SA1 8HJ | 2025 |
| Cursio Construction Ltd | Builders | SA7 0AJ | 2017 |
| Cygnus Holdings (Cardiff) Ltd | Builders | SA7 0AJ | 2018 |
| Darmont Construction Ltd | Builders | SA7 0AJ | 2018 |
| Davan Construction Ltd | Builders | SA7 9LA | 2016 |
| David Waters Bricklaying Ltd | Builders | SA1 6XS | 2015 |
| Dcw Project Services Ltd | Builders | SA7 0AJ | 2018 |
| Ddj Construction Ltd | Builders | SA1 4DQ | 2023 |
| Decale Construction Ltd | Builders | SA1 3HA | 2001 |
| Dhwd Ltd | Builders | SA7 9LA | 2009 |
| Dmd Facades Ltd | Builders | SA7 9WP | 2022 |
| Dmd Roofing and Building Ltd | Builders | SA7 0AJ | 2026 |
| Door System Installations Ltd | Builders | SA7 9LA | 2009 |
| Doulla Constructions Ltd | Builders | SA1 4DQ | 2020 |
| Dragon Sealants Ltd | Builders | SA7 9QB | 2015 |
| Dryhouse Group Ltd | Builders | SA1 3HJ | 2024 |
| Dulais Valley Developments Ltd | Builders | SA7 9FS | 2017 |
| Dyfed Developments Spv 1 Ltd | Builders | SA7 0AP | 2022 |
| Dyfed Developments Spv 2 Ltd | Builders | SA7 0AP | 2022 |
| E4 Renov8 Ltd | Builders | SA7 9EQ | 2024 |
| Eco Construction Ltd | Builders | SA1 3JJ | 2025 |
| Edefec Ltd | Builders | SA1 4JN | 2026 |
| Efficient Living Solutions UK Ltd | Builders | SA7 9LA | 2023 |
| Elite Property Solutions (Swansea) Ltd | Builders | SA1 4DQ | 2025 |
| Encom Building Services Ltd | Builders | SA7 9FP | 2023 |
| Energy Care (Wales) Ltd | Builders | SA1 5RW | 2013 |
| Evans Building Contractors Ltd | Builders | SA1 3US | 2013 |
| Evans Home Improvements Ltd | Builders | SA1 3PP | 2023 |
| Evans Renovations Ltd | Builders | SA1 3PP | 2023 |
| Fernlee Estates Ltd | Builders | SA7 9NL | 1982 |
| Fforest Construction Ltd | Builders | SA1 3PP | 2014 |
| First Class Contractors Ltd | Builders | SA1 4DQ | 2021 |
| Fixtechuk Ltd | Builders | SA1 8QY | 2024 |
| Fla Security Ltd | Builders | SA1 4DQ | 2015 |
| Foundry & Co Construction Ltd | Builders | SA7 0AJ | 2026 |
| Fujm Ltd | Builders | SA1 1DZ | 2025 |
| Gee Utilities Services Ltd | Builders | SA7 9HQ | 2017 |
| Gex Carpentry Ltd | Builders | SA7 0AJ | 2009 |
| Green Dragon Properties (Swansea) Ltd | Builders | SA7 9GA | 2024 |
| Greenview Home Improvements Ltd | Builders | SA7 9AP | 2026 |
| Groesffordd Homes Ltd | Builders | SA7 9FS | 2019 |
| Gwern Estates Ltd | Builders | SA1 8QY | 1947 |
| Hancock Carpentry Ltd | Builders | SA7 0NJ | 2025 |
| Hastlefree Ltd | Builders | SA7 0AJ | 2003 |
| Haven Home Builders Ltd | Builders | SA7 9FS | 2024 |
| Helix 21 Ltd | Builders | SA1 3BL | 2013 |
| Hengoed Davies Ltd | Builders | SA7 9FG | 2007 |
| Ian Davies Investments Ltd | Builders | SA7 9LA | 2020 |
| Ian Davies Plant Ltd | Builders | SA7 9LA | 1996 |
| Ipoh Ltd | Builders | SA1 4DE | 2024 |
| J & L Scaffolding (Wales) Ltd | Builders | SA1 2LP | 2006 |
| J & M Sullivan Ltd | Builders | SA1 8JU | 2019 |
| J Carpentry Ltd | Builders | SA7 0AJ | 2023 |
| J&R Carpentry & Building Ltd | Builders | SA7 0AJ | 2020 |
| J. Homes Ltd | Builders | SA1 3HJ | 1995 |
| J. V. Davies Painters and Decorators Ltd | Builders | SA1 4EH | 2005 |
| Jadeed Ltd | Builders | SA1 6DZ | 2018 |
| Jakupi Construction Ltd | Builders | SA1 6HU | 2023 |
| Jc Levels Ltd | Builders | SA7 9FS | 2026 |
| Jenkinsons Brickwork & Building Ltd | Builders | SA7 0HP | 2023 |
| Jfr Building & Bespoke Refurbishment Ltd | Builders | SA1 4EH | 2024 |
| Jlr Construction & Engineering Ltd | Builders | SA7 9FS | 2021 |
| John Glen (Installation Services) Ltd | Builders | SA1 7DA | 1998 |
| John Weaver (Contractors) Ltd | Builders | SA1 2JW | 1967 |
| John Weaver (Holdings) Ltd | Builders | SA1 2JW | 1996 |
| Johnson, Hall & Company Ltd | Builders | SA7 9LA | 1984 |
| Jon Ball Plastering & Renovations Ltd | Builders | SA7 9LA | 2023 |
| K & N Contractors Ltd | Builders | SA1 3PP | 2023 |
| K&R Construction Ltd | Builders | SA1 1SU | 2017 |
| Karina Lane Construction Ltd | Builders | SA7 9FP | 2019 |
| L.G Endurance Ltd | Builders | SA7 0AJ | 2023 |
| Lions Maintenance Ltd | Builders | SA7 9QX | 2025 |
| Lms (Wales) Ltd | Builders | SA7 9FS | 2014 |
| Lw Property Solutions Ltd | Builders | SA1 4DQ | 2026 |
| Lynch Scaffolding System Ltd | Builders | SA7 0AJ | 2017 |
| M & A Pasha Construction Ltd | Builders | SA1 4DQ | 2022 |
| M & Q Kitchen Ltd | Builders | SA1 1UH | 2026 |
| M.C.L. Bricklaying Ltd | Builders | SA1 3PP | 2003 |
| Martin Taffetsauffer Building & Civil Engineering Contractors Ltd | Builders | SA7 9LA | 2006 |
| Masse Construction Ltd | Builders | SA1 8HE | 2022 |
| Mbc UK Holdings Ltd | Builders | SA1 2LF | 2023 |
| Mdn Stucco Veneziano Ltd | Builders | SA1 8NB | 2024 |
| Meanz Pcm Construction Consultancy Ltd | Builders | SA1 6BS | 2020 |
| Mht Construction Ltd | Builders | SA1 4EH | 2023 |
| Millstones Estates Ltd | Builders | SA7 9LA | 2026 |
| Mly Fabricattion Ltd | Builders | SA1 2BJ | 2026 |