I've had varying luck with shooting interiors through glass, but I don't think the overall light will be nearly as much problem as the reflection, and if you can get close enough to a window, and the light is not too glaring, it can work all right. The widest thing I have at the moment is a 16-85 DX lens on a DX camera, which does not do too badly. If you can get the camera up to the glass, it reduces most of the glare, especially because you yourself will be shielding it from direct light. If you can't get close enough, a polarizer can help, but remember that it also darkens your view a bit, so if the interior is badly lit it will require a pretty high ISO exposure. I'd be sure to take a polarizer anyway, even if some shots are better without it. You may find it helps outdoors anyway.