We are thinking of erecting a log cabin style room at the bottom of our garden. Nothing fancy but it would be good to get WiFi / electrics down there as it would predominantly be used as a teenagers den. We would obviously get a qualified electrician to do this but want to know what it involves? Large trenches in your garden, gouging out holes in your house walls to run wires through etc etc. We also have a patio from our back extension that drops about 45cm onto our lawn, would cabling have to go underneath that?