| 888 Estimating Services Ltd | Builders | WD4 9JB | 2019 |
| A.C.O Heating and Plumbing Ltd | Plumbing & heating | WD4 8PQ | 2016 |
| Able Data Installations Ltd | Electricians | WD4 8FR | 1991 |
| Able Electrical Inspection Ltd | Electricians | WD4 8GW | 1995 |
| Absolute Heat Services Ltd | Plumbing & heating | WD4 8JJ | 2026 |
| Abstract Construction Ltd | Builders | WD4 8LP | 2008 |
| Adi Stag Ltd | Builders | WD4 8QY | 2026 |
| Ajb Group (Oxfordshire) Ltd | Gardeners & landscapers | WD4 9JB | 2017 |
| Alignment Construction Ltd | Builders | WD4 8JB | 2026 |
| Alpiana Stone Ltd | Builders | WD4 8HD | 2011 |
| Amc Construction Solutions Ltd | Builders | WD4 9JB | 2019 |
| Amr Sealants Ltd | Builders | WD4 9JB | 2022 |
| Apw & Sons Ltd | Builders | WD4 9AL | 2014 |
| Artistico UK Ltd | Flooring & tiling | WD4 9JE | 2013 |
| Assemble Spv 3 Ltd | Builders | WD4 8FR | 2026 |
| Auto Fast Repair Ltd | Garages & mechanics | WD4 8LR | 2023 |
| Auto Motive Service & Repair Ltd | Garages & mechanics | WD4 8JE | 2009 |
| Autolink Concessionaires (M6) Plc | Builders | WD4 8UD | 1996 |
| Bankside Electrical Contractors Ltd | Electricians | WD4 8UD | 1970 |
| Bb Mot Centre Ltd | Garages & mechanics | WD4 8LF | 2025 |
| Beauty Retreat Lounge Ltd | Hair & beauty | WD4 8BH | 2026 |
| Belbridge Developments Ltd | Builders | WD4 8FR | 2015 |
| Berkeley Developers Ltd | Flooring & tiling | WD4 8HY | 2024 |
| Blok - Building Ltd | Builders | WD4 9JB | 2020 |
| Bradshaw Interiors Ltd | Plumbing & heating | WD4 8LZ | 2014 |
| Brewster Plumbing & Heating Services Ltd | Plumbing & heating | WD4 8HX | 2015 |
| Brickworth Developments Ltd | Builders | WD4 8UD | 1963 |
| C & C Elvin Properties Ltd | Builders | WD4 8LQ | 2003 |
| Capital Sky Demolition Ltd | Groundworks & demolition | WD4 9JB | 2022 |
| Capital Sky Group Ltd | Builders | WD4 9JB | 2024 |
| Cardiff Gate Business Park Ltd | Builders | WD4 8UD | 1991 |
| Caves Man Barber Ltd | Hair & beauty | WD4 8AB | 2026 |
| Ccs (Herts) Ltd | Garages & mechanics | WD4 8JA | 2024 |
| Century Engineering and Refrigeration Installations Ltd | Plumbing & heating | WD4 8LQ | 1985 |
| Chess Valley Roofing & Construction Ltd | Builders | WD4 9JB | 2026 |
| Chirita Construction Ltd | Builders | WD4 8JU | 2018 |
| Cloontagh Plant Ltd | Builders | WD4 9JB | 2020 |
| Colin Clarke Engineering Ltd | Garages & mechanics | WD4 9LU | 2021 |
| Comprehensive Commercial Services Ltd | Garages & mechanics | WD4 8JA | 1995 |
| Concept Heating Ltd | Electricians | WD4 9JB | 2022 |
| Concord Metropolitan Construction (UK) Ltd | Builders | WD4 8PY | 1990 |
| Coora Plant & Civils (Cpc) Ltd | Builders | WD4 9JB | 2020 |
| Corey Seaton Ltd | Hair & beauty | WD4 8HX | 2022 |
| Ctb Construction Ltd | Builders | WD4 8FW | 2021 |
| D.B. Rees (Builders) Ltd | Builders | WD4 8LB | 1968 |
| D.B. Rees (Dry Lining) Ltd | Builders | WD4 8LB | 1977 |
| David Construction Ltd | Builders | WD4 8FN | 2026 |
| Delatronics Ltd | Appliance repair | WD4 8QP | 2025 |
| Dgr Electrical Services Ltd | Electricians | WD4 8EP | 2022 |
| Dhj 01 Ltd | Builders | WD4 8NW | 2023 |
| Drh Groundworks Ltd | Groundworks & demolition | WD4 8AX | 2013 |
| Dvh Construct Ltd | Builders | WD4 8FJ | 2014 |
| Earth Kind Garden By Gabe Ltd | Gardeners & landscapers | WD4 8DE | 2025 |
| Eastbrook Flooring Ltd | Flooring & tiling | WD4 8FR | 2018 |
| Ejc Film Services Ltd | Builders | WD4 8HH | 2025 |
| Elsworth Electrical Services Ltd | Electricians | WD4 8FR | 2014 |
| Envision Refurbishments Ltd | Builders | WD4 8FN | 2020 |
| Excell Electrical Ltd | Electricians | WD4 8NA | 2016 |
| Facades Cladding Ltd | Builders | WD4 8HD | 2006 |
| Filmtek Ltd | Builders | WD4 8LZ | 2004 |
| Flooring Restoration Services Ltd | Flooring & tiling | WD4 9JB | 2020 |
| Flush Plumbers Ltd | Plumbing & heating | WD4 8HX | 2023 |
| Frozone Ltd | Plumbing & heating | WD4 9DG | 2025 |
| Gaskin & Davis Ltd | Glaziers | WD4 8JB | 1961 |
| George Gr Ltd | Builders | WD4 8FN | 2021 |
| German Autowerks Ltd | Garages & mechanics | WD4 9JB | 2022 |
| Gianco Ltd | Garages & mechanics | WD4 9JD | 2008 |
| Goodwin (Redbourn) Ltd | Builders | WD4 9BB | 2014 |
| Gpf Lewis Plc | Builders | WD4 8JP | 2006 |
| Gpf Lewis Solutions Ltd | Builders | WD4 8JP | 2017 |
| Grk Carpentry Ltd | Joiners & carpenters | WD4 9HL | 2021 |
| Gt Lifting Services Ltd | Builders | WD4 9JB | 2026 |
| Hamilton Property Consultants Ltd | Builders | WD4 9JB | 2014 |
| Hamilton Refurbishments Ltd | Builders | WD4 9JB | 2012 |
| Head Down Scenic Ltd | Joiners & carpenters | WD4 8LP | 2025 |
| Herts Double Glazing and Pergolas Ltd | Glaziers | WD4 8FR | 2014 |
| Hevac Sales Ltd | Plumbing & heating | WD4 9JA | 2003 |
| Hn Electrical Solutions Ltd | Electricians | WD4 9JB | 2016 |
| I&D Estates Ltd | Builders | WD4 8BU | 2023 |
| I-Automate Ltd | Builders | WD4 8LQ | 2011 |
| Imperial Auto Services Ltd | Garages & mechanics | WD4 8JE | 2011 |
| J. K. Rail Ltd | Builders | WD4 8JU | 2006 |
| J.Field Builders Ltd | Builders | WD4 8NR | 2019 |
| Jaycee Contract Flooring Ltd | Flooring & tiling | WD4 8LZ | 2013 |
| Jerram Carpentry & Construction Ltd | Builders | WD4 9JB | 2022 |
| Jmr Pro Ltd | Hair & beauty | WD4 9JB | 2025 |
| John James Building Contractors Ltd | Builders | WD4 8NT | 2010 |
| Jpmeads Ltd | Plumbing & heating | WD4 9JB | 2023 |
| K & S Aesthetics Ltd | Hair & beauty | WD4 8NZ | 2024 |
| K.B. Builders Ltd | Builders | WD4 8JJ | 2002 |
| Kd-B Developments Ltd | Builders | WD4 8PJ | 2001 |
| Kings Langley 4x4 Ltd | Garages & mechanics | WD4 8JU | 2017 |
| Kings Mechanical Electrical Ltd | Electricians | WD4 8AB | 2018 |
| Kmc Home Improvements Ltd | Builders | WD4 9JB | 2018 |
| Langley Autocraft Ltd | Garages & mechanics | WD4 8HD | 2003 |
| Langley Electrical Contractors Ltd | Electricians | WD4 8LZ | 2018 |
| Langley Fire Protection Ltd | Builders | WD4 8ST | 2026 |
| Lashpoint Ltd | Hair & beauty | WD4 9JB | 2017 |
| Leewood Construction Ltd | Builders | WD4 8JJ | 2002 |
| Legacych Ltd | Plumbing & heating | WD4 8FS | 2025 |
| Liberty Home Solutions Ltd | Builders | WD4 8HX | 2021 |
| Live Site Learning Cic | Builders | WD4 8GZ | 2019 |
| Live Site Ltd | Builders | WD4 8GZ | 2017 |
| M Tanner & Sons Ltd | Builders | WD4 9JB | 2018 |
| Marshall & Son Carpentry Ltd | Joiners & carpenters | WD4 9JB | 2017 |
| Max Protect Ltd | Garages & mechanics | WD4 8JE | 2011 |
| Maxi Electrical Ltd | Electricians | WD4 8BE | 2022 |
| Maxx Services Ltd | Plumbing & heating | WD4 8SG | 2017 |
| Mdsal Ltd | Plumbing & heating | WD4 9JB | 2022 |
| Mikemotors Ltd | Garages & mechanics | WD4 8HD | 2025 |
| Mld Gas and Construction Services Ltd | Builders | WD4 9NQ | 2023 |
| Moffat Davis Electrical Contractors Ltd | Electricians | WD4 8LQ | 2013 |
| Mos Projects Ltd | Builders | WD4 8AH | 2023 |
| Multicore Pro Wire Ltd | Electricians | WD4 8BE | 2017 |
| Munnelly Support Services Ltd | Builders | WD4 8LZ | 1982 |
| N & N Electrical Services Ltd | Electricians | WD4 8AB | 2013 |
| Natural Features Aesthetics Ltd | Hair & beauty | WD4 8QU | 2021 |
| Naylor Hawkins Ltd | Builders | WD4 8NB | 2019 |
| Niallmc Ltd | Builders | WD4 9JB | 2022 |
| North London Blinds Ltd | Builders | WD4 8RQ | 2021 |
| Office Support Services (Management) Ltd | Cleaners | WD4 8AJ | 2013 |
| Pcw Drain Services Ltd | Builders | WD4 8FR | 2015 |
| Pcw Drainage Ltd | Plumbing & heating | WD4 8FR | 2013 |
| Poland Developments Ltd | Builders | WD4 9JB | 2020 |
| Pp Property Services Ltd | Gardeners & landscapers | WD4 9JA | 2023 |
| Pqs Solution Ltd | Builders | WD4 8LZ | 2012 |
| R G Structures Ltd | Builders | WD4 8FR | 2022 |
| Red Kite Securities Ltd | Builders | WD4 8UD | 2011 |
| Reliable Property Maintenance Ltd | Builders | WD4 9JB | 2019 |
| Reliable Property Services Ltd | Builders | WD4 9JB | 2019 |
| Renewable Energy Systems Ltd | Builders | WD4 8LR | 1981 |
| Ross Hudson Electrical Ltd | Electricians | WD4 8JH | 2015 |
| S P B Watford Ltd | Builders | WD4 8NS | 2009 |
| Sam1 Construction Ltd | Builders | WD4 8LQ | 2020 |
| Sbc Fleet Cleaning Ltd | Cleaners | WD4 8NE | 2025 |
| Sentaur Services Ltd | Plumbing & heating | WD4 8FR | 2017 |
| Shanimovers Ltd | Removals | WD4 8FF | 2025 |
| Shine Assured Ltd | Cleaners | WD4 9JB | 2021 |
| Silverthorn Installation Services Ltd | Electricians | WD4 8LZ | 2002 |
| Simon Dunn Groundworks & Services Ltd | Builders | WD4 8FS | 2018 |
| Singer Developments Ltd | Builders | WD4 9JB | 2017 |
| Sir Robert Mcalpine Ltd | Builders | WD4 8UD | 1956 |
| Sir Robert Mcalpine Management Contractors Ltd | Builders | WD4 8UD | 1974 |
| Sky Structures Ltd | Builders | WD4 9JB | 2012 |
| Slc Chipperfield Ltd | Garages & mechanics | WD4 9LU | 2020 |
| Smith & Latimer Ltd | Builders | WD4 8JP | 1977 |
| Solid Work Ltd | Joiners & carpenters | WD4 9HS | 2022 |
| Southern Breeze Ltd | Plumbing & heating | WD4 8QB | 2016 |
| St. Blaise (1998) Ltd | Builders | WD4 8UD | 1986 |
| Star Control Services Ltd | Builders | WD4 9JB | 2022 |