| Bussey & Armstrong Ltd - 147 Brinkburn Road - DL3 9LA |
| Carnell Construction - Carlbury Crossing - DL2 3TW |
| Damp Shield - The Old Stables - DL1 5LF |
| Estill Cooper Construction Ltd - 147 Brinkburn Road - DL3 9LA |
| Henry Williams Darlington Ltd - Dodsworth Street - DL1 2NJ |
| Mech Tool Engineering Ltd - Whessoe Road - DL3 0QT |
| P.W. Burton Construction Co. - 39 Hurworth Road - DL2 2DF |
| Saddington Builders - Morton Park - DL1 4PJ |
| Steven Bowes Building & Roofing Contractor - Bramley - DL2 2NT |
| Stone Technical Services Ltd - Unit 9 Nestfield Ind Est Albert Hill - DL1 2NW |
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