Clients outside radius?

I have a ten mile radius around my home for drop ins and walks. If you receive a request for drop ins outside your radius to you offer to sit for the client but charge an outside of radius fee? Or do you simply tell them no...it's too far? Obviously you'd add the contingency to your profile and let the owner know you charge an extra fee before the meet and greet so they have time to find another sitter. Curious.