What Are the Best Low-Cost Marketing Ideas for Home Service Businesses?

In my opinion, the number 1 low or no cost marketing tactic is "establish an online presence".  A google business profile is free and allows you to 1.) showcase social proof (reviews and photos) and 2.) allows you to get new customers for a $0 customer acquisition cost.  Ideally, you've got a professional looking website ranking well too.  Both of those will get you showing up in 2 of the top 4 spots on google, the map pack and search listings.  Additionally, you can take it a step further and pay for Local service ads and search ads and all of a sudden, you're showing up 4 times with every relevant search.