| Bergson & Eaton Ltd. - 4-12 Kempson Close - HP19 8UQ |
| Construction Specialties (UK) Ltd Conspe - St. Andrews Way Industrial Estate - HP19 8AF |
| Grant & Stone Ltd - Southern Road Unit 4 The Vale Industrial Estate - HP19 9EW |
| Kings Langley Building Supplies Ltd - Hartwell Sidings - HP21 8PB |
| Kings Langley Building Supplies Ltd - Hartwell Sidings Oxford Rd - HP21 8PB |
| Plumb Center - 2 Kempson Cl - HP19 8UQ |
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