The cabling company is doing the wrong thing. A splice is an emergency fix and will "work" initially, but is not a long term solution. It will cause numerous problems down the line.

It is also likely, depending upon how they plan to splice the cabling, that it wont even pass certification/testing.

And, it goes against every standard and certifying organization, and every manufacturer's recommendations.

I Totally agree with Roberto. The project cost should have included a cost for rewire. That should plan on remove all old cabling and install new cat 5e or cat6 depending on the needs. For a remodel which in most municipalities is considered a new construction it must meet new electrical/ wiring standards. You must have self supporting non pvc insulated cable known as plenum. Self supporting meaning it must be secured to the main structure not resting on the ceiling tiles or attached to the wiring that is supporting the ceiling tiles. Inspection by the local building inspector and fire inspector is required at several stages during the remodel in our area. On a recent project our contractor had to open a wall that was finished because the code had changed during the construction, inspectors required low voltage and electrical inspection within the wall structure before finishing.