I love threads like these. OP states he wants a wi-fi solution. People say run cables. OP says he doesn't want to or can't run cables. People post again saying run cables. He doesn't need maximum throughput and isn't transferring thousands of small files or even a few large ones, it's Netflix FFS. Try a set of powerlines first but make sure all the plug sockets are on the same ring main otherwise performance will either be terrible or you'll get no throughput at all.
This is a networking forum, strangely you’ll normally find the advice given is not ‘the cheapest option not involving two cups and a bit of string’ but what’s considered good practice. The op is then free to choose whatever they feel best.
If we accept running a cable to each floor is the best answer (lower latency, faster, more reliable, flexible) and that a new build usually means access panels are in place and it’s easy to lift floorboards etc. now rather than after anyone moves in, it’s a no brainier as to what is best. Also new build generally means RCD and independent circuits per floor for lights/sockets, jumping circuits for powerline = bad, I recorded roughly 1/4 loss in sync per jump from a socket and extension on the same circuit. Op would be much better off doing a cable run to each floor, he could then add an AP to the top floor and if required the middle floor, if needs change in time, they can add a switch and still have options. Your solution is subject to the whim’s of electricians (I know several, standard of work varies considerably), the devices on the circuit not causing interference (microwave/fridge/freezer shouldn’t cause spikes, but suppression is not always why it should be), it not impacting the FTTC service (if applicable) and jumping from one circuit to another with added variability from Wi-fi and new builds tending to be short on outdoor space and 3 floors suggesting family, i’d guess Wi-fi may get a bit crowded locally.
So my question is, you know all of this from life/day job, you clearly aren’t an idiot and you deal with the fallout at some level on a daily basis from what you’ve said previously and this is a networking forum, why wouldn't you suggest the better option as being exactly what it is?
Op, if you follow misschief’s advice, it may work, it sucks from a technical perspective and it’s not something that is recommended for all the reasons i’ve provided and more, but please, take sky broadband if you want FTTC and if it doesn’t work phone him and moan about the advice given - i’m *sure* he’ll be happy to mail you his DDI
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