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Fahim, if you can terminate a cat 5 socket and know the run do it yourself, the electrons will never know that it wasn't installed by a licenced cabler, keep your cables segregated from the power and all will be well.
If the building is 2 storey and of modern construction there may be a layer of dampcourse just above the upper floor level that can cause some grief when cabling between levels. If you decide to tackle the job yourself and don't have a Krone tool PM me & I'll send you a cheapie that are giveaways with some panels we use.
BTW Fitting in the roof is often not an option, it's usually easier to lift a sheet of iron or remove a couple of tiles.
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