ANTS. So many ants.

This is my first encounter with this issue so I’m completely open to all and any suggestions!

I’ve recently moved into a house from an apartment. And this summer, I’ve been inundated with ants. Ants everywhere. All through my kitchen, and weirdly my ensuite bathroom (looking for water?).

There’s a few nests I’ve found in the paving, and I’ve used a huge amount of the Richgro Ant Killa granules outside and in the house but they keep coming back 😩

Worst case scenario I could get pest control out. But I’ve had bad experiences in the past, so would prefer not to go down that route if I can avoid it.

Has anyone found something that permanently keeps them out, and safe to use in the kitchen?