| IPWFI |
| Trade association within the window industry supplying NVQ training and insurance backed guarantees. |
| | Indigo Products |
| Trade suppliers of PVCu windows, doors and conservatories. Contact and product details. |
| | Input Joinery Ltd. |
| Andover, Hampshire manufacturers of double-glazed windows and doors, purpose-made conservatories, staircases, spindles and balustrading. |
| | Insect Screens |
| Manufacturers and suppliers of fly screening systems for trade and industry. |
| | Interframe Ltd |
| Manufacturers of PVC-U Windows, Doors and Conservatories |
| | Jubilee Windows |
| Essex-based manufacturers and installers of windows, doors and conservatories. |
| | KAT UK |
| Manufacture and supply PVCu patio doors. Contact details and product information. |
| | Kal Windows |
| Full service company. Details of products, profile and contact information. |
| |
