Mrjrnotch :
vmfantom :
Is there any sort of cabling that can be run between the house and garage? Also, which materials are the walls between the house and garage made of (drywall, brick, concrete, etc.)?
I can't really run any cable, unless that is my only option. I would prefer a wireless solution. There are only glass windows between the two points.
If your router has detachable antennas, you could use a directional antenna like the one below and point it at the garage. That should improve the signal strength of the router by up to 10 dBm for devices in the garage. Just use a wifi analyzer app to check your signal strength in the garage - you'd want to have stronger signal than -67 dBm to minimize packet loss. There are higher gain antennas available.
https://m.ebay.com/itm/Alfa-APA-M25-2-4-5-GHz-dual-band-Wi-Fi-directional-10-dBi-panel-antenna-802-11ac/111451275728