Google Maps v3 fitBounds() Zoom too close for single marker

Another solution is to expand bounds if you detect they are too small before you execute fitBounds():

var bounds = new google.maps.LatLngBounds();
// here you extend your bound as you like
// ...
if (bounds.getNorthEast().equals(bounds.getSouthWest())) {
   var extendPoint = new google.maps.LatLng(bounds.getNorthEast().lat() + 0.01, bounds.getNorthEast().lng() + 0.01);
   bounds.extend(extendPoint);
}
map.fitBounds(bounds);

I really like mrt's solution and it works perfectly if you've always only have one point to work with. I did however find that if the bounding box was not based on one point, but the points were very close together, this could still cause the map to be zoomed in too far.

Here's a way to first check if the points are within a defined distance of each other, then if they are smaller than that minimum distance, extend the bounds by that minimum distance:

var bounds = new google.maps.LatLngBounds();
// here you extend your bound as you like

// ...

var minDistance = 0.002;
var sumA = bounds.getNorthEast().lng() - bounds.getSouthWest().lng();
var sumB = bounds.getNorthEast().lat() - bounds.getSouthWest().lat();

if((sumA < minDistance && sumA > -minDistance) 
&& (sumB < minDistance && sumB > -minDistance)){
var extendPoint1 = new google.maps.LatLng(bounds.getNorthEast().lat() + minDistance, bounds.getNorthEast().lng() + minDistance);
    var extendPoint2 = new google.maps.LatLng(bounds.getNorthEast().lat() - minDistance, bounds.getNorthEast().lng() - minDistance);
    bounds.extend(extendPoint1);
    bounds.extend(extendPoint2);
}

Hope this helps someone!

As for me guys i solve it by creating an idle event after fitBounds. Working perfectly. Guess that's one of the most clean solutions here

var locations = [['loc', lat, lng], ['loc', lat, lng]];
.....
for (i = 0; i < locations.length; i++) { 
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 10
  });
  .... create markers, etc.
}
....
map.fitBounds(bounds);  
google.maps.event.addListenerOnce(map, 'idle', function() {
  if (locations.length == 1) {
    map.setZoom(11);
  }
});

Here is my go at a solution, which also works when two markers are very close. The effective maximum zoom level is the same in both situations. So we do not end up zooming unneccesarily out, when there are more than one marker

The effect, again is ensuring a maximum zoom, without using the maxZoom option, which has the probably unwanted effect of making it impossible for the user to zoom further than the maxZoom level with the zoom control

I have calculated maxLat, minLat, maxLng and minLng beforehand...

var minLatSpan = 0.002;
if (maxLat - minLat < minLatSpan) {
  // ensures that we do not zoom in too much
  var delta = (minLatSpan - (maxLat - minLat)) / 2;
  maxLat += delta;
  minLat -= delta;
}

map.fitBounds({
  east: maxLng,
  west: minLng,
  north: maxLat,
  south: minLat,
});