Wifi Boosters

A lady I help with web design has a cottage some 30-35m away from the main residence. In the main residence there is a fibre 150 router for one of the main service providers. The wifi signal works well in the main house but in the cottage barely any signal is received. I am wondering if any members have ever used a wifi booster to amplify a wifi signal, between separate buildings, and at a distance of 30 or so meters, or would a hard-wired solution need to be found to achieve this. Thanks for any info or help.