| Design & Custom Manufacturing | 01438 748088 | | 22 Basils Road, Stevenage, SG1 3PX |  Map & Directions |
| Aston Construction | 01438 745646 | | 61 High Street, Old Town, Stevenage, SG1 3AQ | | Map & Directions |
| Belfry Construction Services Ltd | 01438 355060 | | Kestrel House, Primett Road, Stevenage, SG1 3EE | | Map & Directions |
| Kingswood Construction | 01438 360490 | | 6 Bowling Green, Stevenage, SG1 3BH | | Map & Directions |
| Mackenzie & Huggins Construction | 01438 311687 | | Unit 9 Leyden Road , Stevenage, SG1 2BW | | Map & Directions |
| Street Level Building Services Ltd | 01438 353686 | | 128 Durham Road, Stevenage, SG1 4HY | | Map & Directions |
| Garrard Building & Construction Ltd | 01438 726691 | | Unit 28, Wedgewood Way, Stevenage, SG1 4QT | | Map & Directions |
| Emerald Builders | 01438 729452 | | The Quadrant Lodge, The Quadrant, Stevenage, SG1 1ER | | Map & Directions |
| Old Town Construction | 01438 354404 | | 26 Southsea Road, Stevenage, SG1 2PJ | | Map & Directions |
| Chantry Construction | 01438 722056 | | 69 Sish Lane, Stevenage, SG1 3LS | | Map & Directions |
| Neve R A | 01438 313191 | | Cromer House , Caxton Way, Stevenage, SG1 2DF | | Map & Directions |
| C D S Facilities Management Ltd | 01438 355521 | | Cromer House, Caxton Way, Stevenage, SG1 2DF | | Map & Directions |
| Apex Carpentry & Building Service Ltd | 01462 892947 | | 51 Chilvers Bank, Baldock, SG7 6HT | | Map & Directions |
| Avelo Joinery & Construction | 01920 487224 | | Unit 18 Caxton Hill, Hertford, SG13 7NF | | Map & Directions |
| J D Pateman | 01438 821178 | | Greenside, London Road, Langley, Hitchin, SG4 7PP | | Map & Directions |
| On Site Ltd | 01763 281400 | | Throcking Road, Cottered, Buntingford, SG9 9RB | | Map & Directions |
| Green Building Design Consultants Ltd | 01992 552111 | | Unit 12, Warehams Lane, Hertford, SG14 1LA | | Map & Directions |
| Crestel Construction Ltd | 01462 480477 | | George King Building, Blackhorse Road, Letchworth Garden City, SG6 1YY | | Map & Directions |
| Unit Builders | 01438 312511 | | 18 Baddeley Close, Stevenage, SG2 9SL | | Map & Directions |
| Kingstar Contracts Ltd | 01462 436006 | | Unit 4, Cooks Way , Hitchin, SG4 0JE | | Map & Directions |
| Excel Professional Installations | 07812 604344 | | 2 Oakfields, Stevenage, SG2 8NF | | Map & Directions |
| C & D Builders Ltd | 01438 820493 | | 58 Valley Road, Codicote, Hitchin, SG4 8YB | | Map & Directions |
| W G Thirkell & Sons | 01767 313346 | | 17 St. Margarets Gardens, Biggleswade, SG18 8NU | | Map & Directions |
| Grehan Contractors Ltd | 01992 500051 | | Grehan House, 57 Molewood Road, Hertford, SG14 3AQ | | Map & Directions |
| C A Edwards | 01767 260873 | | 12 Bull Street, Potton, Sandy, SG19 2NR | | Map & Directions |
| Churchills | 01462 673150 | | 6 Lacre Way, Letchworth Garden City, SG6 1NR | | Map & Directions |
| Greenways Construction | 01992 550529 | | 13 The Avenue, Hertford, SG14 3DQ | | Map & Directions |
| Mccann Homes Ltd | 01462 676148 | | George King Building, Blackhorse Road, Letchworth Garden City, SG6 1YY | | Map & Directions |
| L White | 01920 870734 | | 113 St. Margarets Road, Stanstead Abbotts, Ware, SG12 8ER | | Map & Directions |
| Glenister Building Services Ltd | 01462 442777 | | Bancroft Business Centre, 45-46 Bancroft, Hitchin, SG5 1LA | | Map & Directions |
| T & R Builders | 01992 550784 | | Twitchells, Priors Wood Road, Hertford Heath, Hertford, SG13 7QH | | Map & Directions |
| M J Spavins Ltd | 01462 812425 | | 31 Rectory Road, Campton, Shefford, SG17 5PF | | Map & Directions |
| Wells Building Contractors Ltd | 01767 313956 | | 19 High Street , Broom, Biggleswade, SG18 9NA | | Map & Directions |
| P E Tinsley | 01920 870675 | | 44 Gypsy Lane, Great Amwell, Ware, SG12 9RN | | Map & Directions |
| K Morrison & Sons Ltd | 01920 822121 | | 1 Station Road, Braughing, Ware, SG11 2PB | | Map & Directions |
| L H Long | 01767 627619 | | 49 The Village, Old Warden, Biggleswade, SG18 9HQ | | Map & Directions |
| Alda Building Services | 01763 281666 | | The Limes, Cottered Road, Throcking, Buntingford, SG9 9RR | | Map & Directions |
| Cooney | 01462 441123 | | Hitchin Service Station, Old Park Road, Hitchin, SG5 2JS | | Map & Directions |
| A Kinns | 01763 853139 | | Silver Street, Guilden Morden, Royston, SG8 0JT | | Map & Directions |
| D B Sharp | 0800 015 9948 | | 185 Baldock Road, Letchworth Garden City, SG6 2EJ | | Map & Directions |
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