Kitchens are usually near driveways and backyards. In most homes, the kitchen becomes the mudroom by default since that's where the entry door is usually located. Convert the area near the entry door into a truly mud-proof zone.
Garages are transition areas from the outdoors.
If you're adding a garage, add a mudroom too. Or convert a corner of an existing garage. Utility rooms can be expanded. They make good mudroom conversions if they have an outside entrance. Make better use of the space with a mudroom conversion.