| John Catton Homes Ltd | 01582 462246 | | Lady Bray Farm, Kinsbourne Green, Harpenden, AL5 3PZ |  Map & Directions |
| Chaston's Ltd | 01582 765745 | | 30 Broadstone Road, Harpenden, AL5 1RG | | Map & Directions |
| D N Sampson | 01582 762773 | | 18 Highfield Avenue, Harpenden, AL5 5UA | | Map & Directions |
| C D W Contracting | 01582 766900 | | 70 High Street, Harpenden, AL5 2SP | | Map & Directions |
| Davik Builders Ltd | 01582 712623 | | 47 Crabtree Lane, Harpenden, AL5 5NT | | Map & Directions |
| Hincks Construction Ltd | 01582 766554 | | Thrales End House, Thrales End Lane, Harpenden, AL5 3NS | | Map & Directions |
| Andrews Construction Ltd | 01582 767357 | | 5 Kirkdale Road, Harpenden, AL5 2PT | | Map & Directions |
| Alban Developments Ltd | 01582 768111 | | 1 Park Avenue South, Harpenden, AL5 2DZ | | Map & Directions |
| Design To Build | 01462 817479 | | Rivers Lodge, West Common, Harpenden, AL5 2JD | | Map & Directions |
| Andrews Builders Ltd | 01582 765777 | | Avenue Homes, Clayton House, 7 Vaughan Road, Harpenden, AL5 4EF | | Map & Directions |
| Jarvis Contracting Ltd | 01582 761211 | | 212 Station Road, Harpenden, AL5 4EH | | Map & Directions |
| Claridge & Hall Bros Ltd | 01582 715267 | | 1 Cowper Road, Harpenden, AL5 5NF | | Map & Directions |
| Harpenden Construction Ltd | 01582 460485 | | 6 Wood End Road, Harpenden, AL5 3ED | | Map & Directions |
| West Side Building Ltd | 01707 375650 | | 32 Applecroft Road, Welwyn Garden City, AL8 6LA | | Map & Directions |
| Premier Plastering | 01707 339505 | | 50 Marsden Green, Welwyn Garden City, AL8 6YB | | Map & Directions |
| J Vermeiren | 01727 769856 | | 56 Napsbury Avenue, London Colney, St. Albans, AL2 1LS | | Map & Directions |
| Home Extension Team Ltd | 01727 851111 | | 44 London Road, St. Albans, AL1 1NG | | Map & Directions |
| Stephen Axworthy | 01727 838893 | | 31 Oster Street, St. Albans, AL3 5JN | | Map & Directions |
| Anderson Developments | 01727 868006 | | 205 The Ridgeway, St. Albans, AL4 9XG | | Map & Directions |
| Prizecroft Ltd | 01582 794005 | | 4 Crown Street, Redbourn, St. Albans, AL3 7JX | | Map & Directions |
| Traditional Builders | 01438 712511 | | 27 Robbery Bottom Lane, Welwyn, AL6 0UL | | Map & Directions |
| R P M Building Contractors Ltd | 01582 794481 | | 10 Dunstable Road, Redbourn, St. Albans, AL3 7PQ | | Map & Directions |
| Oakbridge Homes Ltd | 01582 794499 | | The Priory, High Street, Redbourn, St. Albans, AL3 7LZ | | Map & Directions |
| W G Hillier & Co | 01582 840236 | | 50 High Street, Markyate, St. Albans, AL3 8HZ | | Map & Directions |
| F E Fitzjohn | 01727 825624 | | 10 Willowside, London Colney, St. Albans, AL2 1DP | | Map & Directions |
| C & S Dumpleton Ltd | 01727 862464 | | 29 Culver Road, St. Albans, AL1 4EB | | Map & Directions |
| C C A Construction Ltd | 01707 267902 | | 17 Scholars Wk, Hatfield, AL10 8ST | | Map & Directions |
| R E Rosser | 01582 833460 | | 2 Leasey Bridge Cottages, Leasey Bridge Lane, Wheathampstead, St. Albans, AL4 8EF | | Map & Directions |
| Richbon | 01707 334145 | | 45 Hollybush Lane, Welwyn Garden City, AL7 4JH | | Map & Directions |
| B & K Construction | 01707 267784 | | 1 Station Road, North Mymms, Hatfield, AL9 7PN | | Map & Directions |
| V J Buck | 01727 830242 | | 1 St. Albans Road, Sandridge, St. Albans, AL4 9LA | | Map & Directions |
| Alban Building Contractors Ltd | 01727 851681 | | 12 Springwood Wk, St. Albans, AL4 9UN | | Map & Directions |
| Gd Construction Ltd | 01727 811442 | | Mca House, 2 Cambridge Road, St. Albans, AL1 5LJ | | Map & Directions |
| Shepherd Builders Ltd | 01582 840487 | | 12 Trowley Hill Road , Flamstead, St. Albans, AL3 8EE | | Map & Directions |
| T & B Contractors Ltd | 01582 833633 | | Riverside House, Place Farm, Wheathampstead, St. Albans, AL4 8SB | | Map & Directions |
| Gemco Services Ltd | 01727 827080 | | Willows Farm, Off Courses Road, London Colney, St. Albans, AL2 1BB | | Map & Directions |
| C J Harbert | 01727 873484 | | 197 Park Street Lane , Park Street, St. Albans, AL2 2BA | | Map & Directions |
| Lawrence Jevon | 01727 860926 | | 11 Leyland Avenue, St. Albans, AL1 2BD | | Map & Directions |
| Kirk Building Developments | 01727 851655 | | 31 The Park, St. Albans, AL1 4RU | | Map & Directions |
| G J Hearn | 01727 874200 | | 10 Branch Road, Park Street, St. Albans, AL2 2LU | | Map & Directions |
| J Welch | 01707 334244 | | 38 Brocket Road, Welwyn Garden City, AL8 7TY | | Map & Directions |
| Dennis Bozier Ltd | 01727 834324 | | 17 Sandpit Lane, St. Albans, AL1 4DY | | Map & Directions |
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