If the electrics are from the house, it should be fine to use powerline adapters. Because your old boy says the setup is as you've described, it can be his problem if they don't work.
Repeaters aren't worth a left handed wank.
I'd buy another wireless router (even a shit one you get free with sky or plusnet) and get that broadcasting a separate SSiD in the garage, with the Ethernet patched into the powerline adapter. Switch off DHCP on the garage router, turn off the internet services also - just ensure it has a management I.P address on the same network as your one in the house.
Boom.
Thats how I've done my garage/house setup. The distances aren't as much as yours, but its enough not to have a wifi signal in the garage... thus, the phone just connects to the garage ssid when its close and vice versa when I'm in the house.
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