We can install materials supplied by clients but if there are any issues with the materials, incompatibility we’ll have still have to charge for our time/attendance. Also, our 12 months warranty covers only materials supplied by us. We strongly recommend to start with an inspection in order to check what is required, can be used and whether you need any other remedial works that are required by regulations in order to go ahead with alterations/additions to your electrical installation. Even though all inspections are chargeable we think this is still more cost effective way.