| A Leonard Ltd | Painters & decorators | SG7 6HZ | 2000 |
| Ac&Dc Electrical Ltd | Electricians | SG6 4BJ | 2023 |
| Aca Solutions Ltd | Builders | SG6 1LA | 2018 |
| Acorn Garage Doors Group Ltd | Joiners & carpenters | SG6 1NE | 2021 |
| Ad Plumbing & Heating Services Ltd | Plumbing & heating | SG6 4PG | 2020 |
| Adl Electrics Ltd | Electricians | SG6 1GJ | 2024 |
| Ajs Construct Ltd | Builders | SG7 6NG | 2020 |
| Alija Ltd | Builders | SG6 4LW | 2018 |
| Allrounduk Building & Construction Ltd | Builders | SG7 5FJ | 2011 |
| Amber Paving Ltd | Builders | SG6 2TU | 2012 |
| Amh Maintenance Ltd | Builders | SG6 4LH | 2009 |
| Amys Electrical and Building Ltd | Builders | SG6 4QL | 2017 |
| Anglia Complete Services Ltd | Cleaners | SG7 6SP | 2006 |
| Apollo Interiors Ltd | Builders | SG7 6QQ | 2010 |
| Apollo Property Developments Ltd | Builders | SG7 6QQ | 2015 |
| Aqua Go Ltd | Cleaners | SG7 6QB | 2025 |
| Aqua In Ltd | Cleaners | SG7 6QB | 2026 |
| Artur Heating & Plumbing Ltd | Plumbing & heating | SG6 4DE | 2025 |
| As Nagra Ltd | Builders | SG6 4DZ | 2014 |
| Ashwell Garage Ltd | Garages & mechanics | SG7 5LG | 2008 |
| Asp Carpentry Solutions Ltd | Joiners & carpenters | SG6 1HB | 2006 |
| Atec M&E Ltd | Electricians | SG6 1HJ | 2019 |
| Awb Electrical Services Ltd | Electricians | SG7 5DD | 2020 |
| B D Electrical Contractors Ltd | Electricians | SG7 6HP | 2008 |
| B N R Construction Ltd | Builders | SG6 4YN | 2019 |
| Baldock Nail Spa Ltd | Hair & beauty | SG7 6BG | 2025 |
| Barski Property Care Ltd | Builders | SG6 1DF | 2026 |
| Beauty Bee Academy Ltd | Hair & beauty | SG6 4YN | 2025 |
| Belle and Bee Beauty X Baldock Ltd | Hair & beauty | SG7 5AF | 2025 |
| Ben Coulter Electrical Ltd | Electricians | SG6 1LW | 2017 |
| Berts Autos Ltd | Garages & mechanics | SG6 1UJ | 2025 |
| Bhb Electrical and Construction Services Ltd | Electricians | SG6 2TU | 1999 |
| Blue Whale Plumbing and Heating Ltd | Plumbing & heating | SG6 2TU | 2023 |
| Brickstone Renovation Ltd | Flooring & tiling | SG6 1GJ | 2013 |
| Brown'S Boilers Ltd | Plumbing & heating | SG6 4BH | 2023 |
| Btr Plumbing Ltd | Plumbing & heating | SG7 5BG | 2026 |
| Bw Consultants Ltd | Builders | SG6 1GJ | 1998 |
| Bywater Plumbing & Heating Ltd | Plumbing & heating | SG6 2TU | 2010 |
| Carovans Ltd | Electricians | SG7 5LN | 2023 |
| Cb Cityskape Ltd | Builders | SG6 1BZ | 2019 |
| Chilfen Contracting Ltd | Joiners & carpenters | SG6 1HJ | 2010 |
| Chilfen Joinery Ltd | Joiners & carpenters | SG6 1HJ | 1985 |
| Complete Building Services (Herts) Ltd | Builders | SG6 1LA | 2003 |
| Craig Bryder Plumbing & Heating Ltd | Plumbing & heating | SG6 4QA | 2023 |
| D & P Decorators (Letchworth) Ltd | Painters & decorators | SG6 4RP | 2021 |
| D & R Construction and Son Ltd | Groundworks & demolition | SG7 6SF | 2011 |
| D Allen Services Ltd | Plumbing & heating | SG6 1DR | 2025 |
| D F Keane Building Maintenance Ltd | Builders | SG6 1GJ | 2014 |
| D F Keane Building Services Ltd | Builders | SG6 1GJ | 1999 |
| D F Keane New Homes Ltd | Builders | SG6 1GJ | 2015 |
| D M Petroleum Services Ltd | Builders | SG6 2TU | 2003 |
| D.B. Sharp and Sons Ltd | Builders | SG6 1LA | 1985 |
| D.F. Keane Ltd | Builders | SG6 1GJ | 1993 |
| Dacor Crew Ltd | Builders | SG6 4BJ | 2026 |
| Damp Proofing & Building Specialists Ltd | Builders | SG6 4BJ | 2025 |
| Dapper Dog Grooming Ltd | Hair & beauty | SG7 6AQ | 2025 |
| Dave Morgan Ltd | Builders | SG6 1UJ | 2018 |
| Davis Plastering Ltd | Builders | SG6 1GP | 2019 |
| Debnam Services Ltd | Hair & beauty | SG7 6QQ | 2017 |
| Dg Cleaners UK Ltd | Cleaners | SG6 4BL | 2024 |
| Dhh Garden Services Ltd | Gardeners & landscapers | SG6 1HP | 2015 |
| Diamond Wheels Ltd | Garages & mechanics | SG6 1JF | 2025 |
| Diljap Brickwork Ltd | Builders | SG6 2TU | 2017 |
| Dilpreet Brickwork Ltd | Builders | SG6 2TU | 2011 |
| Dk Cleancare Ltd | Cleaners | SG6 1DW | 2026 |
| Dkh Underfloor Heating Consultants Ltd | Plumbing & heating | SG6 2PV | 2007 |
| Dnd Exterior Cleaning Ltd | Cleaners | SG6 4YN | 2026 |
| Dpc Contracts (London) Ltd | Plumbing & heating | SG7 6QQ | 2011 |
| Dpc Electrical Contracts Ltd | Electricians | SG7 6QQ | 2017 |
| Drb Building Ltd | Builders | SG6 1FB | 2021 |
| Ds2buildingsolution Ltd | Builders | SG6 4BL | 2025 |
| E F Groundworks & Construction Ltd | Builders | SG6 4UX | 2022 |
| E W Flooring Specialists Ltd | Flooring & tiling | SG6 2TU | 2022 |
| Eden Special Works Ltd | Builders | SG7 6AQ | 2018 |
| Egri Maintenance Ltd | Builders | SG6 4BS | 2007 |
| Elitco Ltd | Flooring & tiling | SG6 2RA | 2012 |
| Ellicott Productions Ltd | Joiners & carpenters | SG6 4EJ | 2017 |
| Encompass Property Solutions Ltd | Builders | SG6 9BL | 2024 |
| Ermal Contractors Ltd | Builders | SG6 4DB | 2013 |
| Esa Plumbing & Heating Ltd | Plumbing & heating | SG6 1GJ | 2024 |
| Essential Water Services (UK) Ltd | Builders | SG6 1FQ | 2009 |
| Esthetically Pleasing Ltd | Hair & beauty | SG6 4JG | 2022 |
| Eurolight Ltd | Roofers | SG6 1UJ | 2016 |
| Ev Park Ltd | Electricians | SG6 1UJ | 2020 |
| Ev Park Management Ltd | Electricians | SG6 1UJ | 2021 |
| Ev Park Rp Ltd | Electricians | SG6 1UJ | 2021 |
| Exclusive Conservatory Roofs Ltd | Roofers | SG6 1GJ | 2026 |
| Exclusive Interiors By Roberto Occhipinti Ltd | Joiners & carpenters | SG6 1HP | 2019 |
| Exclusive Solar Ltd | Electricians | SG6 1GJ | 2026 |
| Executive Valeting and Detailing Ltd | Garages & mechanics | SG6 1DU | 2025 |
| Ez.Pz Works Ltd | Builders | SG7 6QQ | 2026 |
| Flawless Beauty By Sabina Ltd | Hair & beauty | SG6 4QH | 2023 |
| Foster & Shackell Ltd | Builders | SG6 1HP | 2005 |
| Frogmore Fencing Ltd | Joiners & carpenters | SG6 2TU | 2014 |
| G & T Electrical Ltd | Electricians | SG6 4JT | 2021 |
| G D Building and Maintenance Services Ltd | Builders | SG7 6RT | 2016 |
| G Davies Electrical Services Ltd | Electricians | SG6 4UN | 2022 |
| G.O.A.L Energy Services Ltd | Electricians | SG6 1GJ | 2026 |
| G.T. Cannon Electrical Ltd | Electricians | SG7 5AQ | 2003 |
| Gcar Trading Ltd | Cleaners | SG6 1JF | 2025 |
| Gecko Garden Rooms Ltd | Builders | SG6 4XD | 2026 |
| Gentle Property & Construction Ltd | Builders | SG7 5DX | 2024 |
| Geoghegan Bros. Ltd | Builders | SG7 6QQ | 1973 |
| Gilbert & Gregson Construction Ltd | Builders | SG6 1UJ | 2014 |
| Gilbert Shipley Ltd | Hair & beauty | SG7 6BG | 2026 |
| Gmj Solutions Ltd | Builders | SG7 6NE | 2026 |
| Gpmr Consulting Ltd | Electricians | SG6 3LT | 2013 |
| Grace Improvements Ltd | Glaziers | SG6 2RB | 2015 |
| Grade A Beauty Ltd | Hair & beauty | SG7 6NS | 2021 |
| Graham Property Solutions Ltd | Builders | SG6 2TU | 2025 |
| H & W Property Valuers Ltd | Builders | SG6 2TU | 2021 |
| Hall Network Services Ltd | Electricians | SG6 9BL | 2001 |
| Hambidge Consultancy Ltd | Builders | SG6 9BL | 2007 |
| Hanrahan Ltd | Electricians | SG7 6EX | 2002 |
| Harveys Roofing Ltd | Roofers | SG7 5ES | 2025 |
| Hertfordshire Landscape Solutions Ltd | Builders | SG6 4FA | 2009 |
| Hertfordshire Roofing Ltd | Builders | SG7 6QQ | 2007 |
| Hertfordshire Windows Ltd | Glaziers | SG7 6HP | 2015 |
| High Voltage Commissioning Ltd | Electricians | SG6 4HS | 2025 |
| Hiretowire Ltd | Electricians | SG6 2TU | 2025 |
| Hitchins (Hatfield) Ltd | Builders | SG6 1GJ | 1968 |
| Holland Motor Company Ltd | Garages & mechanics | SG6 1SP | 2015 |
| Hsdw Ltd | Builders | SG7 5JX | 2024 |
| Hydropro UK Ltd | Builders | SG6 1LA | 2025 |
| Icon Connect Ltd | Builders | SG6 1FJ | 1987 |
| Igb Fencing Ltd | Joiners & carpenters | SG6 2TU | 2012 |
| Invista Electrical Services Ltd | Electricians | SG6 1HX | 2020 |
| Invista Maintenance Services Ltd | Electricians | SG6 1HX | 2020 |
| Iv Services (Letchworth) Ltd | Garages & mechanics | SG6 1HB | 2004 |
| Iverley Properties Ltd | Builders | SG7 6DD | 1999 |
| J. Hyland Motor Services Letchworth Ltd | Garages & mechanics | SG6 1JF | 2021 |
| K W Maintenance Ltd | Cleaners | SG6 2TU | 2024 |
| Kamber Electrical Ltd | Electricians | SG6 1DS | 2009 |
| Kay'S Flawless Clean Ltd | Cleaners | SG6 4PJ | 2026 |
| Kehft’S Pressure and Shine Ltd | Cleaners | SG6 3QX | 2025 |
| Kendall'S Group Ltd | Builders | SG6 4BL | 2024 |
| Kindlelight Windows Ltd | Glaziers | SG7 6HP | 2012 |
| Kiteley Construction Ltd | Builders | SG7 5DT | 2025 |
| L B P Plumbing and Heating Ltd | Plumbing & heating | SG6 2TU | 2006 |
| Langstone Construction Ltd | Builders | SG6 1GJ | 2016 |
| Lawrence Thorogood Ltd | Builders | SG7 6QU | 2023 |
| Lee Sharman Fencing Ltd | Builders | SG7 6HB | 2005 |
| Letchworth Car Care Ltd | Garages & mechanics | SG6 1NR | 2003 |
| Letchworth Coachworks Ltd | Garages & mechanics | SG6 1WB | 2012 |
| Letchworth Diamond Wheels Ltd | Garages & mechanics | SG6 1JF | 2024 |
| Lmbu Ltd | Electricians | SG6 1FQ | 2020 |
| Logo Shine UK Ltd | Cleaners | SG6 4UZ | 2026 |
| Lpp Construction Services Ltd | Builders | SG7 5JG | 2014 |
| Lubo Minchev Electrical Ltd | Electricians | SG6 4NN | 2026 |
| M. Hyland Motor Services Ltd | Garages & mechanics | SG6 1JF | 2003 |