| THRESHOLD Bars | CARPET ACCESSORY TRIMS LTD |
| GRADUS ACCESSORIES |
| SCHLUTER SYSTEMS LTD |
| THRESHOLD Door Seals | ASTROFLAME FIRESEALS LTD |
| GRANT HAZE LONDON LTD |
| INTUCHEM |
| LORIENT LTD |
| NOBERNE SEALS |
| NORSOUND LTD |
| RELCROSS LTD |
| STORMFLAME LTD |
| STRAND HARDWARE LTD |
| THE STORMGUARD GROUP |
| THRESHOLD Drains | ACO TECHNOLOGIES PLC (BUILDING DRAINAGE) |
| ACO TECHNOLOGIES PLC (DRAINS) |
| COMPONENT DEVELOPMENTS LTD |
| WAVIN HEPWORTH |
| THRESHOLD Draught Excluders | ASTROFLAME FIRESEALS LTD |
| INTUMESCENT SYSTEMS LTD |
| LORIENT LTD |
| NOBERNE SEALS |
| NORSOUND LTD |
| TECHNIBOND LTD |
| THE STORMGUARD GROUP |
| THRESHOLD Plates | CARPET ACCESSORY TRIMS LTD |
| GRADUS ACCESSORIES |
| LORIENT LTD |
| NORSOUND LTD |
| SCHLUTER SYSTEMS LTD |
| THRESHOLD Profiles | CARPET ACCESSORY TRIMS LTD |
| GRADUS ACCESSORIES |
| SCHLUTER SYSTEMS LTD |
| THRESHOLD Ramps | AKW LTD |
| ASTROFLAME FIRESEALS LTD |
| QUANTICK LTD |
| RELCROSS LTD |
| SAFETY SHOP |
| THE STORMGUARD GROUP |
| WATCO UK LTD |
| THRESHOLD Sills | ASTROFLAME FIRESEALS LTD |
| LORIENT LTD |
| NOBERNE SEALS |
| NORSOUND LTD |
| THE STORMGUARD GROUP |
| THRESHOLD Smoke Seals | ASTROFLAME FIRESEALS LTD |
| LORIENT LTD |
| THRESHOLD Trims | CARPET ACCESSORY TRIMS LTD |
| GRADUS ACCESSORIES |
| SCHLUTER SYSTEMS LTD |
