I use an Apple Airport Express to extend the home network to my shed via a plug-in network power plug thingy I had spare. There’s a bit of a trick to it if you don’t have an Apple router (you basically replicate the wi-fi network rather than use the Express as an extender) but gives the advantage of being able to Airplay music from my iPhone when I’m tinkering in the shed since I’ve got some cheap computer speakers plugged into it too. Handy for those long and awkward maintenance jobs.
Not the cheapest way of doing it I must confess, but I like having wireless music. I can even open the shed doors in summer, crank up the speakers and control the music from the iPhone whilst tending the BBQ and drinking a beer in the garden 😀